Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is 75%. For sheet brass,
sheet nickel, babbitt, white
metal, hard rubber use 75% to 80%. For mild steel, aluminum, cast iron, and
cast brass use 70% to 75%. For bronze, tool steel, drop forging, stainless
steel, cast steel, nickel, and copper use 65% to 70%. This table list the
actual size of drill wanted there may not be an exact match use the next large
drill you can purchase.
Size diam. 100%
95% 90% 85%
80% 75% 70%
65% 60% 55%
50%
4 40 .1120 .0795 .0811 .0828 .0844 .0860 .0876 .0893
.0909 .0925 .0941 .0958
6 32 .1380 .0974 .0994 .1015 .1035 .1055 .1076 .1096
.1116 .1136 .1157 .1177
8 32 .1640 .1234 .1254 .1275 .1295 .1315 .1336 .1356
.1376 .1396 .1417 .1437
10 24 .1900 .1359 .1386 .1413 .1440 .1467 .1494 .1521
.1548 .1575 .1602 .1629
10 32 .1900 .1494 .1514 .1535 .1555 .1575 .1596 .1616
.1636 .1656 .1677 .1697
12 24 .2160 .1619 .1646 .1673 .1700 .1727 .1754 .1781
.1808 .1835 .1862 .1889
12 28 .2160 .1696 .1719 .1742 .1766 .1789 .1812 .1835
.1858 .1882 .1905 .1928
1/ 4 20 .2500 .1850 .1883 .1915 .1948 .1980 .2013 .2045
.2078 .2110 .2143 .2175
1/ 4 28 .2500 .2036 .2059 .2082 .2106 .2129 .2152 .2175
.2198 .2222 .2245 .2268
5/16 18 .3125 .2403 .2439 .2475 .2512 .2548 .2584 .2620
.2656 .2692 .2728 .2764
5/16 24 .3125 .2584 .2611 .2638 .2665 .2692 .2719 .2746
.2773 .2800 .2827 .2854
3/ 8 16 .3750 .2938 .2979 .3019 .3060 .3100 .3141 .3182
.3222 .3263 .3303 .3344
3/ 8 24 .3750 .3209 .3236 .3263 .3290 .3317 .3344 .3371 .3398
.3425 .3452 .3479
7/16 14 .4375 .3447 .3494 .3540 .3586 .3633 .3679 .3725
.3772 .3818 .3865 .3911
7/16 20 .4375 .3725 .3758 .3790 .3823 .3855 .3888 .3920
.3953 .3985 .4018 .4050
1/ 2 13 .5000 .4001 .4051 .4101 .4151 .4201 .4251 .4301
.4350 .4400 .4450 .4500
1/ 2 20 .5000 .4350 .4383 .4415 .4448 .4480 .4513 .4545
.4578 .4610 .4643 .4675
5/ 8 11 .6250 .5069 .5128 .5187 .5246 .5305 .5364 .5423
.5482 .5541 .5600 .5660
5/ 8 18 .6250 .5528 .5564 .5600 .5637 .5673 .5709 .5745
.5781 .5817 .5853 .5889
M 2 0.40 .0787 .0583 .0593 .0603
.0614 .0624 .0634 .0644 .0654 .0665 .0675 .0685
M 2 0.25 .0787 .0660 .0666 .0672
.0679 .0685 .0692 .0698 .0704 .0711 .0717 .0723
M 3 0.50 .1181 .0925 .0938 .0951
.0964 .0977 .0989 .1002 .1015 .1028 .1040 .1053
M 3 0.35 .1181 .1002 .1011 .1020
.1029 .1038 .1047 .1056 .1065 .1074 .1083 .1092
M 4 0.70 .1575 .1217 .1235 .1253
.1271 .1288 .1306 .1324 .1342 .1360 .1378 .1396
M 4 0.50 .1575 .1319 .1332 .1345
.1357 .1370 .1383 .1396 .1409 .1421 .1434 .1447
M 5 0.80 .1969 .1559 .1580 .1600
.1621 .1641 .1662 .1682 .1703 .1723 .1743 .1764
M 5 0.50 .1969 .1713 .1726 .1738
.1751 .1764 .1777 .1790 .1802 .1815 .1828 .1841
M 6 1.00 .2362 .1851 .1876 .1902
.1927 .1953 .1979 .2004 .2030 .2055 .2081 .2106
M 6 0.75 .2362 .1979 .1998 .2017
.2036 .2055 .2075 .2094 .2113 .2132 .2151 .2170
M 7 1.00 .2756 .2244 .2270 .2296
.2321 .2347 .2372 .2398 .2423 .2449 .2475 .2500
M 7 0.75 .2756 .2372 .2392 .2411
.2430 .2449 .2468 .2487 .2507 .2526 .2545 .2564
M 8 1.25 .3150 .2510 .2542 .2574
.2606 .2638 .2670 .2702 .2734 .2766 .2798 .2830
M 8 1.00 .3150 .2638 .2664 .2689
.2715 .2740 .2766 .2792 .2817 .2843 .2868 .2894
M 8 0.75 .3150 .2766 .2785 .2804
.2824 .2843 .2862 .2881 .2900 .2919 .2939 .2958
M 10 1.50 .3937 .3170 .3208
.3247 .3285 .3323 .3362 .3400 .3438 .3477 .3515 .3553
M 10 1.25 .3937 .3298 .3330
.3362 .3394 .3426 .3458 .3490 .3521 .3553 .3585 .3617
M 10 1.00 .3937 .3426 .3451
.3477 .3502 .3528 .3553 .3579 .3605 .3630 .3656 .3681
M 10 0.75 .3937 .3553 .3573 .3592
.3611 .3630 .3649 .3669 .3688 .3707 .3726 .3745
M 12 1.75 .4724 .3829 .3874
.3919 .3964 .4008 .4053 .4098 .4143 .4187 .4232 .4277
M 12 1.50 .4724 .3957 .3996
.4034 .4072 .4111 .4149 .4187 .4226 .4264 .4302 .4341
M 12 1.25 .4724 .4085 .4117
.4149 .4181 .4213 .4245 .4277 .4309 .4341 .4373 .4405
M 12 1.00 .4724 .4213 .4239
.4264 .4290 .4315 .4341 .4366 .4392 .4418 .4443 .4469
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is 75%. For sheet brass,
sheet nickel, babbitt, white
metal, hard rubber use 75% to 80%. For mild steel, aluminum, cast iron, and
cast brass use 70% to 75%. For bronze, tool steel, drop forging, stainless
steel, cast steel, nickel, and copper use 65% to 70%. This table lists the next
available American drill except for the letter drills use the next larger size.
Size diam. 100%
95% 90% 85%
80% 75% 70%
65% 60% 55%
50%
4 40
.1120 #46 #46
#44 #44 #44
#43 #43 #42
#42 3/32 #41
6 32
.1380 #40 #39
#38 #37 #36
7/64 7/64 #34
#33 #32 #31
8 32
.1640 1/ 8 1/ 8
#30 #29 #29
#29 #29 #28
#28 #27 #27
10 24
.1900 #29 #28
#28 #27 #26
#25 #24 #23
#22 #20 #19
10 32
.1900 #25 #24
#23 5/32 #22
#21 #20 #19
#19 #18 #18
12 24
.2160 #20 #19
#18 #18 11/64 #16
#15 #15 #13
3/16 #12
12 28
.2160 #18 11/64 #16
#16 #15 #14
#13 #13 3/16
#11 #10
1/ 4 20
.2500 #13 3/16
#11 # 9 # 8
# 7 # 6 # 4
# 3 7/32 7/32
1/ 4 28
.2500 13/64 # 5 # 4 # 3 #
3 7/32
7/32 7/32 # 2 # 1
# 1
5/16 18 .3125 C
D D 1/ 4
F F G
17/64 I I J
5/16 24 .3125 F
G 17/64 17/64
I I J
J
K 9/32 L
3/ 8 16 .3750 M
19/64 N 5/16 5/16 5/16 P P 21/64 Q R
3/ 8 24 .3750 P P 21/64 21/64 Q R R R 11/32 11/32 S
7/16 14 .4375 11/32 S
T T U
U 3/
8 V
W W 25/64
7/16 20 .4375 3/ 8
3/ 8 V W
W
25/64 25/64 X X Y
Y
1/ 2 13 .5000 Y Y Z Z 27/64 7/16
7/16 7/16 29/64 29/64 29/64
1/ 2 20
.5000 7/16 7/16 29/64 29/64 29/64 29/64 29/64
15/32 15/32 15/32 15/32
5/ 8 11
.6250 33/64 33/64
33/64 17/32 17/32 35/64 35/64 35/64 18/32 18/32 37/64
5/ 8 18
.6250 18/32 18/32
18/32 18/32 37/64 37/64 37/64 37/64
19/32 19/32 19/32
M 2 0.40 .0787
#53 #53 1/16 1/16 1/16 #52 #51
#51 #51 #50
#50
M 2 0.25 .0787
#51 #51 #51
#50 #50 #50
#50 #49 #49
#49 #49
M 3 0.50 .1181
#42 #42 #41
#41 #40 #39
#38 #38 #37
#37 #36
M 3 0.35 .1181
#38 #38 #38
#37 #37 #36
#36 #36 7/64 7/64 7/64
M 4 0.70 .1575
1/ 8 1/ 8 1/ 8
#30 #30 #29
#29 #29 #29
#28 #28
M 4 0.50 .1575
#29 #29 #29
#29 #28 #28
#28 #28 #27
#27 #27
M 5 0.80 .1969
5/32 #22 #20
#19 #19 #19
#18 #18 11/64 #16
#16
M 5 0.50 .1969
11/64 11/64 #17 #16
#16 #16 #15
#15 #14 #14
#13
M 6 1.00 .2362
#13 3/16 #11
#10 # 9 # 8
# 7 13/64 # 5 # 4
# 3
M 6 0.75 .2362
# 8 # 8 # 7
13/64 # 5 # 4 # 4
# 3 # 3 7/32 7/32
M 7 1.00 .2756 # 1 # 1
A A A B
C C D
1/ 4 1/ 4
M 7 0.75 .2756 B B C
C
D D 1/ 4
1/ 4 F F F
M 8 1.25 .3150 1/ 4 F F G 17/64 17/64
I I J
K L
M 8 1.00 .3150 17/64 17/64 I I J J K
K
L L L
M 8 0.75 .3150 J J K K L
L L L M M M
M 10 1.50
.3937 O P
P
21/64 Q R R 11/32 S
T T
M 10 1.25
.3937 21/64 Q R
R
11/32 11/32 S T
T T U
M 10 1.00
.3937 11/32 11/32
S T T T T 23/64 U
U U
M 10 0.75
.3937 T T T 23/64 U
U U U 3/ 8 3/ 8 3/ 8
M 12 1.75
.4724 W W 25/64 X
Y Y Z
Z
27/64 27/64 7/16
M 12 1.50
.4724 X Y
Y
13/32 Z Z 27/64 27/64 7/16 7/16 7/16
M 12 1.25
.4724 13/32 Z Z 27/64 27/64 7/16 7/16 7/16 7/16 7/16 29/64
M 12 1.00
.4724 27/64 27/64
7/16 7/16 7/16 7/16 7/16 7/16 29/64 29/64 29/64
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is 75%. For sheet brass,
sheet nickel, babbitt, white
metal, hard rubber use 75% to 80%. For mild steel, aluminum, cast iron, and
cast brass use 70% to 75%. For bronze, tool steel, drop forging, stainless
steel, cast steel, nickel, and copper use 65% to 70%. This table lists the next
available American drill except for the letter drills use the next larger size.
The percent values after the drill size are the correct values for that drill.
Size diam. 100% 95% 90% 85% 80% 75%
8 32 .1640 1/ 8
96% 1/ 8 96% #30 87% #29
69% #29 69% #29 69%
1/
1/
5/16 18 .3125 C
98% D 92% D 92% 1/ 4 87% F
77% F 77%
5/16 24 .3125 F
103% G 95% 17/64 87% 17/64
87% I 75% I 75%
3/ 8 16 .3750 M
99% 19/64 96% N 90% 5/16 77% 5/16
77% 5/16 77%
3/ 8 24 .3750 P
96% P 96% 21/64 87% 21/64
87% Q 79% R 67%
7/16 14 .4375 11/32
101% S 96% T 86% T 86% U 75% U 75%
7/16 20 .4375 3/ 8
96% 3/ 8 96% V 93% W 79% W 79% 25/64 72%
1/ 2 13 .5000 Y
96% Y 96% Z 87% Z 87% 27/64 78% 7/16
63%
1/ 2 20 .5000 7/16
96% 7/16 96% 29/64 72% 29/64
72% 29/64 72% 29/64 72%
5/ 8 11 .6250 33/64
93% 33/64 93% 33/64 93% 17/32
79% 17/32 79% 35/64 66%
5/ 8 18 .6250 18/32
87% 18/32 87% 18/32 87% 18/32
87% 37/64 65% 37/64 65%
M
M
M
M
M 4 0.70 .1575 1/ 8 91% 1/ 8
91% 1/ 8 91% #30 81% #30
81% #29 60%
M
M
M
M
M
M
M 7 0.75 .2756 B 98% B 98% C 88% C 88% D 77% D 77%
M 8 1.25 .3150 1/ 4 102% F
91% F 91% G 84% 17/64
77% 17/64 77%
M 8 1.00 .3150 17/64 97% 17/64
97% I 84% I 84% J 74% J 74%
M 8 0.75 .3150 J 99% J 99% K 89% K 89% L 65% L 65%
M 10 1.50
.3937 O 101% P 92% P 92% 21/64 86% Q
80% R 71%
M 10 1.25
.3937 21/64 103% Q 97% R 86% R 86% 11/32 78% 11/32
78%
M 10 1.00
.3937 11/32 98% 11/32
98% S 89% T 70% T 70% T 70%
M 10 0.75
.3937 T 93% T 93% T 93% 23/64 89% U
67% U 67%
M 12 1.75
.4724 W 97% W 97% 25/64 91% X
84% Y 76% Y 76%
M 12 1.50
.4724 X 98% Y 89% Y 89% 13/32 86% Z
77% Z 77%
M 12 1.25 .4724 13/32 103% Z 93% Z 93% 27/64 79% 27/64
79% 7/16 55%
M 12 1.00
.4724 27/64 99% 27/64
99% 7/16 68% 7/16 68% 7/16
68% 7/16 68%
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is 75%. For sheet brass,
sheet nickel, babbitt, white
metal, hard rubber use 75% to 80%. For mild steel, aluminum, cast iron, and
cast brass use 70% to 75%. For bronze, tool steel, drop forging, stainless
steel, cast steel, nickel, and copper use 65% to 70%. This table lists the next
available American drill except for the letter drills use the next larger size.
The percent values after the drill size are the correct values for that drill.
Size diam. 75% 70% 65% 60% 55% 50%
1/
1/
5/16 18 .3125 F
77% G 71% 17/64 65% I
56% I 56% J 49%
5/16 24 .3125 I
75% J 66% J 66% K 58% 9/32 58% L
42%
3/ 8 16 .3750 5/16
77% P 64% P 64% 21/64 58% Q
53% R 44%
3/ 8 24 .3750 R
67% R 67% R 67% 11/32 58% 11/32
58% S 50%
7/16 14 .4375 U
75% 3/ 8 67% V 65% W 56% W 56% 25/64 51%
7/16 20 .4375 25/64
72% 25/64 72% X 62% X 62% Y 52% Y 52%
1/ 2 13 .5000 7/16
63% 7/16 63% 7/16 63% 29/64
47% 29/64 47% 29/64 47%
1/ 2 20 .5000 29/64
72% 29/64 72% 15/32 48% 15/32
48% 15/32 48% 15/32 48%
5/ 8 11 .6250 35/64
66% 35/64 66% 35/64 66% 18/32
53% 18/32 53% 37/64 40%
5/ 8 18 .6250 37/64
65% 37/64 65% 37/64 65% 19/32
43% 19/32 43% 19/32 43%
M
M
M
M
M
M
M
M
M
M
M 7 1.00 .2756 B 74% C 66% C 66% D 58% 1/ 4 50% 1/ 4
50%
M 7 0.75 .2756 D 77% 1/ 4 67% 1/ 4
67% F 48% F 48% F 48%
M 8 1.25 .3150 17/64 77% I
67% I 67% J 59% K 53% L
39%
M 8 1.00 .3150 J 74% K 66% K 66% L 49% L 49% L 49%
M 8 0.75 .3150 L 65% L 65% L 65% M 52% M 52% M 52%
M 10 1.50
.3937 R 71% R 71% 11/32 65% S
60% T 47% T
47%
M 10 1.25
.3937 11/32 78% S
71% T 56% T 56% T 56% U 40%
M 10 1.00
.3937 T 70% T 70% 23/64 67% U
50% U 50% U 50%
M 10 0.75
.3937 U 67% U 67% U 67% 3/ 8 49% 3/ 8
49% 3/ 8 49%
M 12 1.75
.4724 Y 76% Z 66% Z 66% 27/64 56% 27/64
56% 7/16 39%
M 12 1.50
.4724 Z 77% 27/64 66% 27/64
66% 7/16 46% 7/16 46% 7/16
46%
M 12 1.25
.4724 7/16 55% 7/16
55% 7/16 55% 7/16 55% 7/16
55% 29/64 30%
M 12 1.00
.4724 7/16 68% 7/16
68% 7/16 68% 29/64 38% 29/64
38% 29/64 38%
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is group 2. For sheet
brass, sheet nickel, babbitt,
white metal, hard rubber use group 1. For mild steel, aluminum, cast iron, and
cast brass use group 2. For bronze, tool steel, drop forging, stainless steel,
cast steel, nickel, and copper use group 3. This table lists the next available
American drill except for the letter drills use the next larger size. Pick the
group best suited for you work pick either drill listed. Metric drills have
been add as they will become more available.
Size diam. group
1 group 2 group 3
/----------------------------\
/----------------------------\
/----------------------------\
4 40
.1120 #44 2.2mm
#43 2.2mm #43
2.3mm #42 2.3mm
6 32 .1380 #36
2.7mm 7/64 2.7mm
7/64 2.8mm #34
2.8mm
8 32
.1640 #29 3.3mm
#29 3.4mm #29
3.4mm #28 3.5mm
10 24
.1900 #26 3.7mm
#25 3.8mm #24
3.9mm #23 3.9mm
10 32
.1900 #22 4.0mm
#21 4.1mm #20
4.1mm #19
4.2mm
12 24 .2160 11/64
4.4mm #16 4.5mm
#15 4.5mm #15
4.6mm
12 28
.2160 #15 4.5mm
#14 4.6mm #13
4.7mm #13 4.7mm
1/ 4 20 .2500 # 8
5.0mm # 7 5.1mm
# 6 5.2mm #
4 5.3mm
1/ 4 28 .2500 # 3
5.4mm 7/32 5.5mm
7/32 5.5mm 7/32
5.6mm
5/16 18 .3125 F
6.5mm F 6.6mm
G 6.7mm 17/64
6.7mm
5/16 24 .3125 I
6.8mm I 6.9mm
J 7.0mm J
7.0mm
3/ 8 16 .3750 5/16
7.9mm 5/16 8.0mm
P 8.1mm P
8.2mm
3/ 8 24 .3750 Q
8.4mm R 8.5mm
R 8.6mm R
8.6mm
7/16 14 .4375 U
9.2mm U 9.3mm
3/ 8 9.5mm V
9.6mm
7/16 20 .4375 W
9.8mm 25/64 9.9mm
25/64 10.0mm X 10.0mm
1/ 2 13 .5000 27/64 10.7mm 7/16
10.8mm 7/16 10.9mm
7/16 11.1mm
1/ 2 20 .5000 29/64 11.4mm 29/64 11.5mm 29/64 11.5mm 15/32 11.6mm
5/ 8 11 .6250 17/32 13.5mm 35/64 13.6mm 35/64 13.8mm 35/64 13.9mm
5/ 8 18 .6250 37/64 14.4mm 37/64 14.5mm 37/64 14.6mm 37/64 14.7mm
M 2 0.40 .0787 1/16 1.6mm
#52 1.6mm #51
1.6mm #51 1.7mm
M 2 0.25 .0787
#50 1.7mm #50
1.8mm #50 1.8mm
#49 1.8mm
M 3 0.50 .1181
#40 2.5mm #39
2.5mm #38 2.5mm
#38 2.6mm
M 3 0.35 .1181
#37 2.6mm #36
2.7mm #36 2.7mm
#36 2.7mm
M 4 0.70 .1575
#30 3.3mm #29
3.3mm #29 3.4mm
#29 3.4mm
M 4 0.50 .1575
#28 3.5mm #28
3.5mm #28 3.5mm
#28 3.6mm
M 5 0.80 .1969
#19 4.2mm #19
4.2mm #18 4.3mm
#18 4.3mm
M 5 0.50 .1969
#16 4.5mm #16
4.5mm #15 4.5mm
#15 4.6mm
M 6 1.00 .2362 # 9 5.0mm
# 8 5.0mm # 7
5.1mm 13/64 5.2mm
M 6 0.75 .2362 # 5 5.2mm
# 4 5.3mm # 4
5.3mm # 3 5.4mm
M 7 1.00 .2756 A 6.0mm
B 6.0mm C
6.1mm C 6.2mm
M 7 0.75 .2756 D 6.2mm
D 6.3mm 1/ 4
6.3mm 1/ 4 6.4mm
M 8 1.25 .3150 17/64 6.7mm
17/64 6.8mm I
6.9mm I 6.9mm
M 8 1.00 .3150 J 7.0mm
J 7.0mm K
7.1mm K 7.2mm
M 8 0.75 .3150 L 7.2mm
L 7.3mm L
7.3mm L 7.4mm
M 10 1.50
.3937 Q 8.4mm
R 8.5mm R
8.6mm 11/32 8.7mm
M 10 1.25
.3937 11/32 8.7mm 11/32
8.8mm S 8.9mm
T 8.9mm
M 10 1.00
.3937 T 9.0mm
T 9.0mm T
9.1mm 23/64 9.2mm
M 10 0.75
.3937 U 9.2mm
U 9.3mm U
9.3mm U 9.4mm
M 12 1.75
.4724 Y 10.2mm
Y 10.3mm Z
10.4mm Z 10.5mm
M 12 1.50
.4724 Z 10.4mm
Z 10.5mm 27/64 10.6mm 27/64 10.7mm
M 12 1.25
.4724 27/64 10.7mm 7/16 10.8mm 7/16
10.9mm 7/16 10.9mm
M 12 1.00
.4724 7/16 11.0mm 7/16
11.0mm 7/16 11.1mm
7/16 11.2mm
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is group 2. For sheet
brass, sheet nickel, babbitt,
white metal, hard rubber use group 1. For mild steel, aluminum, cast iron, and
cast brass use group 2. For bronze, tool steel, drop forging, stainless steel,
cast steel, nickel, and copper use group 3. This table lists the next available
American drill except for the letter drills use the next larger size. Pick the
group best suited for you work pick either drill listed. Metric drills have
been add as they will become more available. The
percent values after the drill size are the correct values for that drill.
Size diam. group
1 group 2 group 3
/----------------------------------\
/--------------------------------\
/--------------------------------\
Size diam. 80% 75% 70% 65%
1/
1/ 4 28 .2500 # 3
0.0001 80% 7/32 0.0036
67% 7/32 0.0013 67% 7/32
-.0010 67%
5/16 18 .3125 F
0.0022 77% F -.0014
77% G -.0010 71% 17/64 0.0000 65%
5/16 24 .3125 I
0.0028 75% I 0.0001
75% J 0.0024 66% J
-.0003 66%
3/ 8 16 .3750 5/16
0.0025 77% 5/16 -.0016
77% P 0.0048 64% P
0.0008 64%
3/ 8 24 .3750 Q
0.0003 79% R 0.0046
67% R 0.0019 67% R
-.0008 67%
7/16 14 .4375 U
0.0047 75% U 0.0001
75% 3/ 8 0.0025 67% V
-.0002 65%
7/16 20 .4375 W
0.0005 79% 25/64 0.0018 72% 25/64 -.0014 72% X
0.0017 62%
1/ 2 13 .5000 27/64 0.0018
78% 7/16 0.0124 63% 7/16
0.0074 63% 7/16 0.0025
63%
1/ 2 20 .5000 29/64 0.0051
72% 29/64 0.0018 72% 29/64
-.0014 72% 15/32 0.0110 48%
5/ 8 11 .6250 17/32 0.0008
79% 35/64 0.0105 66% 35/64
0.0046 66% 35/64 -.0013 66%
5/ 8 18 .6250 37/64 0.0108
65% 37/64 0.0072 65% 37/64
0.0036 65% 37/64 0.0000 65%
M
M
M
M
M
M
M
M
M
M
M 7 1.00 .2756 A -.0007
81% B 0.0008 74% C
0.0022 66% C -.0003
66%
M 7 0.75 .2756 D 0.0011
77% D -.0008 77% 1/ 4
0.0013 67% 1/ 4 -.0007
67%
M 8 1.25 .3150 17/64 0.0018 77% 17/64 -.0014 77% I
0.0018 67% I
-.0014 67%
M 8 1.00 .3150 J 0.0030
74% J 0.0004 74% K
0.0018 66% K -.0007
66%
M 8 0.75 .3150 L 0.0057
65% L 0.0038 65% L
0.0019 65% L -.0000
65%
M 10 1.50
.3937 Q -.0003 80% R 0.0028
71% R -.0010 71% 11/32 -.0000 65%
M 10 1.25
.3937 11/32 0.0012 78% 11/32 -.0020 78% S
-.0010 71% T 0.0059
56%
M 10 1.00
.3937 T 0.0052 70% T 0.0027
70% T 0.0001 70% 23/64 -.0011 67%
M 10 0.75
.3937 U 0.0050 67% U 0.0031
67% U 0.0011 67% U
-.0008 67%
M 12 1.75
.4724 Y 0.0032 76% Y -.0013
76% Z 0.0032 66% Z
-.0013 66%
M 12 1.50
.4724 Z 0.0019 77% Z -.0019
77% 27/64 0.0032 66% 27/64
-.0007 66%
M 12 1.25 .4724 27/64 0.0006 79% 7/16 0.0130
55% 7/16 0.0098 55% 7/16
0.0066 55%
M 12 1.00
.4724 7/16 0.0060
68% 7/16 0.0034 68% 7/16
0.0009 68% 7/16 -.0017
68%
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is group 2. For sheet
brass, sheet nickel, babbitt,
white metal, hard rubber use group 1. For mild steel, aluminum, cast iron, and
cast brass use group 2. For bronze, tool steel, drop forging, stainless steel,
cast steel, nickel, and copper use group 3. This table lists the next available
American drill except for the letter drills use the next larger size. Pick the
group best suited for you work pick either drill listed. Metric drills have
been add as they will become more available. Note
letter drills have been substituted for the next larger fractional drill.
Size diam. group 1 group 2 group 3
/----------------------------\
/----------------------------\
/----------------------------\
4 40
.1120 #44 2.2mm
#43 2.2mm #43
2.3mm #42 2.3mm
6 32 .1380 #36
2.7mm 7/64 2.7mm
7/64 2.8mm #34
2.8mm
8 32
.1640 #29 3.3mm
#29 3.4mm #29
3.4mm #28 3.5mm
10 24
.1900 #26 3.7mm
#25 3.8mm #24
3.9mm #23 3.9mm
10 32
.1900 #22 4.0mm
#21 4.1mm #20
4.1mm #19 4.2mm
12 24 .2160 11/64
4.4mm #16 4.5mm
#15 4.5mm #15
4.6mm
12 28
.2160 #15 4.5mm
#14 4.6mm #13
4.7mm #13 4.7mm
1/ 4 20 .2500 # 8
5.0mm # 7 5.1mm
# 6 5.2mm # 4
5.3mm
1/ 4 28 .2500 # 3
5.4mm 7/32 5.5mm
7/32 5.5mm 7/32
5.6mm
5/16 18 .3125 17/64
6.5mm 17/64 6.6mm
17/64 6.7mm
17/64 6.7mm
5/16 24 .3125 9/32
6.8mm 9/32 6.9mm
9/32 7.0mm 9/32
7.0mm
3/ 8 16 .3750 5/16
7.9mm 5/16 8.0mm
21/64 8.1mm 21/64
8.2mm
3/ 8 24 .3750 11/32
8.4mm 11/32 8.5mm
11/32 8.6mm 11/32
8.6mm
7/16 14 .4375 3/ 8
9.2mm 3/ 8 9.3mm
3/ 8 9.5mm 25/64
9.6mm
7/16 20 .4375 25/64
9.8mm 25/64 9.9mm
25/64 10.0mm 13/32 10.0mm
1/ 2 13 .5000 27/64 10.7mm 7/16
10.8mm 7/16 10.9mm
7/16 11.1mm
1/ 2 20 .5000 29/64 11.4mm 29/64 11.5mm 29/64 11.5mm 15/32 11.6mm
5/ 8 11 .6250 17/32 13.5mm 35/64 13.6mm 35/64 13.8mm 35/64 13.9mm
5/ 8 18 .6250 37/64 14.4mm 37/64 14.5mm 37/64 14.6mm 37/64 14.7mm
M 2 0.40 .0787 1/16 1.6mm
#52 1.6mm #51
1.6mm #51 1.7mm
M 2 0.25 .0787
#50 1.7mm #50
1.8mm #50 1.8mm
#49 1.8mm
M 3 0.50 .1181
#40 2.5mm #39
2.5mm #38 2.5mm
#38 2.6mm
M 3 0.35 .1181
#37 2.6mm #36
2.7mm #36 2.7mm
#36 2.7mm
M 4 0.70 .1575
#30 3.3mm #29
3.3mm #29 3.4mm
#29 3.4mm
M 4 0.50 .1575
#28 3.5mm #28
3.5mm #28 3.5mm
#28 3.6mm
M 5 0.80 .1969
#19 4.2mm #19
4.2mm #18 4.3mm
#18 4.3mm
M 5 0.50 .1969
#16 4.5mm #16
4.5mm #15 4.5mm
#15 4.6mm
M 6 1.00 .2362 # 9 5.0mm
# 8 5.0mm # 7 5.1mm
13/64 5.2mm
M 6 0.75 .2362 # 5 5.2mm
# 4 5.3mm # 4
5.3mm # 3 5.4mm
M 7 1.00 .2756 15/64 6.0mm
1/ 4 6.0mm 1/ 4
6.1mm 1/ 4 6.2mm
M 7 0.75 .2756 1/ 4 6.2mm
1/ 4 6.3mm 1/ 4 6.3mm
1/ 4 6.4mm
M 8 1.25 .3150 17/64 6.7mm
17/64 6.8mm 9/32
6.9mm 9/32 6.9mm
M 8 1.00 .3150 9/32 7.0mm
9/32 7.0mm 9/32
7.1mm 9/32 7.2mm
M 8 0.75 .3150 19/64 7.2mm
19/64 7.3mm 19/64 7.3mm
19/64 7.4mm
M 10 1.50
.3937 11/32 8.4mm 11/32
8.5mm 11/32 8.6mm
11/32 8.7mm
M 10 1.25
.3937 11/32 8.7mm 11/32
8.8mm 23/64 8.9mm
23/64 8.9mm
M 10 1.00
.3937 23/64 9.0mm 23/64
9.0mm 23/64 9.1mm
23/64 9.2mm
M 10 0.75
.3937 3/ 8 9.2mm
3/ 8 9.3mm 3/ 8
9.3mm 3/ 8 9.4mm
M 12 1.75
.4724 13/32 10.2mm 13/32 10.3mm 27/64 10.4mm 27/64 10.5mm
M 12 1.50
.4724 27/64 10.4mm 27/64 10.5mm 27/64 10.6mm 27/64 10.7mm
M 12 1.25
.4724 27/64 10.7mm 7/16 10.8mm 7/16
10.9mm 7/16 10.9mm
M 12 1.00
.4724 7/16 11.0mm 7/16
11.0mm 7/16 11.1mm
7/16 11.2mm
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one peak
to the next. Depending on what kind of material being tapped the size of hole
will vary. When taping by hand use 90% to 50% and when using power tools use
80% through 50%. The most common used size drill is group 2. For sheet brass,
sheet nickel, babbitt, white
metal, hard rubber use group 1. For mild steel, aluminum, cast iron, and cast
brass use group 2. For bronze, tool steel, drop forging, stainless steel, cast
steel, nickel, and copper use group 3. This table lists the next available
American drill except for the letter drills use the next larger size. Pick the
group best suited for you work pick either drill listed. Metric drills have
been add as they will become more available. Note
letter drills have been substituted for the next larger fractional drill.The percent values after the drill size are the
correct values for that drill.
Size diam. group
1 group 2 group 3
/----------------------------------\
/--------------------------------\
/--------------------------------\
Size diam. 80% 75% 70% 65%
1/
1/ 4 28 .2500 # 3
0.0001 80% 7/32 0.0036
67% 7/32 0.0013 67% 7/32
-.0010 67%
5/16 18 .3125 17/64 0.0108
65% 17/64 0.0072 65% 17/64 0.0036 65% 17/64 0.0000 65%
5/16 24 .3125 9/32
0.0121 58% 9/32 0.0094
58% 9/32 0.0067 58% 9/32
0.0040 58%
3/ 8 16 .3750 5/16
0.0025 77% 5/16 -.0016
77% 21/64 0.0099 58% 21/64
0.0059 58%
3/ 8 24 .3750 11/32 0.0121
58% 11/32 0.0094 58% 11/32
0.0067 58% 11/32 0.0040 58%
7/16 14 .4375 3/ 8
0.0117 67% 3/ 8 0.0071
67% 3/ 8 0.0025 67% 25/64 0.0134 51%
7/16 20 .4375 25/64 0.0051
72% 25/64 0.0018 72% 25/64
-.0014 72% 13/32 0.0110 48%
1/ 2 13 .5000 27/64 0.0018
78% 7/16 0.0124 63% 7/16
0.0074 63% 7/16 0.0025
63%
1/ 2 20 .5000 29/64 0.0051
72% 29/64 0.0018 72% 29/64
-.0014 72% 15/32 0.0110 48%
5/ 8 11 .6250 17/32 0.0008
79% 35/64 0.0105 66% 35/64
0.0046 66% 35/64 -.0013 66%
5/ 8 18 .6250 37/64 0.0108
65% 37/64 0.0072 65% 37/64
0.0036 65% 37/64 0.0000 65%
M
M
M
M
M
M
M
M
M
M
M 7 1.00 .2756 15/64 -.0003 81% 1/ 4
0.0128 50% 1/ 4 0.0102
50% 1/ 4 0.0077 50%
M 7 0.75 .2756 1/ 4 0.0051
67% 1/ 4 0.0032 67% 1/ 4
0.0013 67% 1/ 4 -.0007
67%
M 8 1.25 .3150 17/64 0.0018 77% 17/64 -.0014 77% 9/32
0.0111 53% 9/32 0.0079
53%
M 8 1.00 .3150 9/32 0.0073
66% 9/32 0.0047 66% 9/32
0.0021 66% 9/32 -.0004
66%
M 8 0.75 .3150 19/64 0.0126 47% 19/64 0.0107 47% 19/64 0.0088 47% 19/64 0.0069 47%
M 10 1.50
.3937 11/32 0.0115 65% 11/32 0.0076 65% 11/32 0.0038 65% 11/32 -.0000 65%
M 10 1.25
.3937 11/32 0.0012 78% 11/32 -.0020 78% 23/64 0.0104 54% 23/64 0.0073 54%
M 10 1.00
.3937 23/64 0.0066 67% 23/64 0.0041 67% 23/64 0.0015 67% 23/64 -.0011 67%
M 10 0.75
.3937 3/ 8 0.0120
49% 3/ 8 0.0101 49% 3/ 8
0.0081 49% 3/ 8 0.0062
49%
M 12 1.75 .4724 13/32 0.0055 74% 13/32 0.0010 74% 27/64 0.0121 56% 27/64 0.0076 56%
M 12 1.50
.4724 27/64 0.0108 66% 27/64 0.0070 66% 27/64 0.0032 66% 27/64 -.0007 66%
M 12 1.25
.4724 27/64 0.0006 79% 7/16 0.0130
55% 7/16 0.0098 55% 7/16
0.0066 55%
M 12 1.00
.4724 7/16 0.0060
68% 7/16 0.0034 68% 7/16
0.0009 68% 7/16 -.0017
68%
Here
are the sizes of drill required to produce the required thread. For each line
the first part is the size of screw followed by the threads per inch or in
metric the pitch. For example 4 40 is a size 4 screw with 40 threads per inch.
While M 2 0.40 is a metric 2mm with a 0.40mm pitch, the distances between one
peak to the next. Depending on what kind of material being tapped the size of
hole will vary. When taping by hand use 90% to 50% and when using power tools
use 80% through 50%. The most common used size drill is group 2. For sheet
brass, sheet nickel, babbitt,
white metal, hard rubber use group 1. For mild steel, aluminum, cast iron, and
cast brass use group 2. For bronze, tool steel, drop forging, stainless steel,
cast steel, nickel, and copper use group 3. This table lists the next available
American drill except for the letter drills use the next larger size. Pick the
group best suited for you work pick either drill listed. Note letter drills
have been substituted for the next larger fractional drill; as a result the
percent is lower than expected.
Size diam. group
1 group 2 group 3
/---------------------------\
/---------------------------\ /---------------------------\
1/
1/ 4 28 .2500 # 3
80% 7/32 67%
7/32 67% 7/32
67%
5/16 18 .3125 17/64
65% 17/64 65%
17/64 65% 17/64
65%
5/16 24 .3125 9/32
58% 9/32 58%
9/32 58% 9/32
58%
3/ 8 16 .3750 5/16
77% 5/16 77%
21/64 58% 21/64
58%
3/ 8 24 .3750 11/32
58% 11/32 58%
11/32 58% 11/32
58%
7/16 14 .4375 3/ 8
67% 3/ 8 67%
3/ 8 67% 25/64
51%
7/16 20 .4375 25/64
72% 25/64 72%
25/64 72% 13/32
48%
1/ 2 13 .5000 27/64
78% 7/16 63%
7/16 63%
7/16 63%
1/ 2 20 .5000 29/64
72% 29/64 72%
29/64 72% 15/32
48%
5/ 8 11 .6250 17/32
79% 35/64 66%
35/64 66% 35/64
66%
5/ 8 18 .6250 37/64
65% 37/64
65% 37/64 65%
37/64 65%
M
M
M
M
M
M
M
M
M
M
M 7 1.00 .2756 15/64 81%
1/ 4 50% 1/ 4
50% 1/ 4 50%
M 7 0.75 .2756 1/ 4 67%
1/ 4 67% 1/ 4
67% 1/ 4 67%
M 8 1.25 .3150 17/64 77%
17/64 77% 9/32
53% 9/32 53%
M 8 1.00 .3150 9/32 66%
9/32 66% 9/32
66% 9/32 66%
M 8 0.75 .3150 19/64 47%
19/64 47% 19/64
47% 19/64 47%
M 10 1.50
.3937 11/32 65%
11/32 65% 11/32
65% 11/32 65%
M 10 1.25
.3937 11/32 78%
11/32 78% 23/64
54% 23/64 54%
M 10 1.00
.3937 23/64 67%
23/64 67% 23/64
67% 23/64 67%
M 10 0.75
.3937 3/ 8 49%
3/ 8 49% 3/ 8
49% 3/ 8 49%
M 12 1.75
.4724 13/32 74%
13/32 74% 27/64
56% 27/64 56%
M 12 1.50
.4724 27/64 66%
27/64 66% 27/64
66% 27/64 66%
M 12 1.25
.4724 27/64 79%
7/16 55% 7/16
55% 7/16 55%
M 12 1.00
.4724 7/16 68%
7/16 68% 7/16
68% 7/16 68%
The tap is the size and
thread per inch. The drill is the recommended size to drill the hole for
tapping or use the next fraction. The decimal size is the smallest and largest
size of hole for hand tapping with 90% to 50% thread.
National National
Course Fine
Tap Drill Decimal Tap Drill
Decimal
4-40 43
.083 - .096 4-48 42
.088 - .099
6-32 36 .102 - .118 6-40 33
.109 - .122
8-32 29 .128 - .144 8-36 29
.132 - .146
10-24 25 .141 - .163 10-32
21 .154 - .170
12-24 16 .167 - .189 12-28 14
.174 - .193
1/4-20
7 .192 - .218 1/4-28 3
.208 - .227
5/16-18
F .247 - .276 5/16-24 I
.263 - .285
3/8-16 5/16
.302 - .334 3/8-24 Q
.326 - .348
7/16-14
U .354 - .391 7/16-20 25/64
.379 - .405
1/2-13
27/64 .410 - .450 1/2-20 29/64
.442 - .468
The tap is the size and
thread per inch. The drill is the recommended size to drill the hole for
tapping or use the next fraction. The decimal size is the smallest and largest
size of hole for hand tapping with 90% to 50% thread.
National National
Course
Fine
Tap Drill Decimal Tap Drill
Decimal
4-40 43 .083 - .096 4-48 42
.088 - .099
6-32 36 .102 - .118 6-40 33
.109 - .122
8-32 29
.128 - .144 8-36 29
.132 - .146
10-24 25 .141 - .163 10-32 21
.154 - .170
12-24 16 .167 - .189 12-28 14
.174 - .193
1/4-20
7 .192 - .218 1/4-28 3
.208 - .227
5/16-18
F .247 - .276 5/16-24 I
.263 - .285
3/8-16
5/16 .302 - .334 3/8-24 Q
.326 - .348
7/16-14
U .354 - .391 7/16-20 25/64
.379 - .405
1/2-13
27/64 .410 - .450 1/2-20 29/64
.442 - .468
screw size screw size
screw size screw size
#
0 .0600
#
1 .0730
#
2 .0860
#
3 .0990
#
4 .1120
#
5 .1250
#
6 .1380
#
8 .1640
#10
.1900
#12
.2160
#14
.2420
1/
4 .2500
5/16
.3125
3/
8 .3750
7/16
.4375
1/
2 .5000
9/16
.5625
5/
8 .6250
11/16
.6875
3/
4 .7500
13/16
.8125
7/
8 .8750
15/16
.9375
1.0mm .0394
1.5mm .0591
2.0mm .0787
2.5mm .0984
3.0mm .1181
3.5mm .1378
4.0mm .1575
4.5mm .1772
5.0mm .1969
5.5mm .2165
6.0mm .2362
7.0mm .2756
8.0mm .3150
9.0mm .3543
10.0mm .3937
11.0mm .4331
12.0mm .4724
13.0mm .5118
14.0mm .5512
15.0mm .5906
16.0mm .6299
17.0mm .6693
18.0mm .7087
20.0mm .7874
22.0mm .8661
24.0mm .9449
1.0mm .0394
1.5mm .0591
#
0 .0600
#
1 .0730
2.0mm .0787
#
2 .0860
2.5mm .0984
#
3 .0990
#
4 .1120
3.0mm .1181
#
5 .1250
3.5mm .1378
#
6 .1380
4.0mm .1575
#
8 .1640
4.5mm .1772
#10
.1900
5.0mm .1969
#12
.2160
5.5mm .2165
6.0mm .2362
#14
.2420
1/
4 .2500
7.0mm .2756
5/16
.3125
8.0mm .3150
9.0mm .3543
3/
8 .3750
10.0mm .3937
11.0mm .4331
7/16
.4375
12.0mm .4724
1/
2 .5000
13.0mm .5118
14.0mm .5512
9/16
.5625
15.0mm .5906
5/
8 .6250
16.0mm .6299
17.0mm .6693
11/16
.6875
18.0mm .7087
3/
4 .7500
20.0mm .7874
13/16
.8125
22.0mm .8661
7/
8 .8750
15/16
.9375
24.0mm .9449
Convert metric mm to
inch. Add the column number to the
number on left in mm
the body is the decimal inches converted. 2.5mm =.0984 inch.
0.0 0.1 0.2
0.3 0.4 0.5
0.6 0.7 0.8
0.9
0 .0000
.0039 .0079 .0118
.0157 .0197 .0236
.0276 .0315 .0354
1 .0394
.0433 .0472 .0512
.0551 .0591 .0630
.0669 .0709 .0748
2 .0787
.0827 .0866 .0906
.0945 .0984 .1024
.1063 .1102 .1142
3 .1181
.1220 .1260 .1299
.1339 .1378 .1417
.1457 .1496 .1535
4 .1575
.1614 .1654 .1693
.1732 .1772 .1811
.1850 .1890 .1929
5 .1969
.2008 .2047 .2087
.2126 .2165 .2205
.2244 .2283 .2323
6 .2362
.2402 .2441 .2480
.2520 .2559 .2598
.2638 .2677 .2717
7 .2756
.2795 .2835 .2874
.2913 .2953 .2992
.3031 .3071 .3110
8 .3150
.3189 .3228 .3268
.3307 .3346 .3386
.3425 .3465 .3504
9 .3543
.3583 .3622 .3661
.3701 .3740 .3780
.3819 .3858 .3898
10
.3937 .3976 .4016
.4055 .4094 .4134
.4173 .4213 .4252
.4291
11
.4331 .4370 .4409
.4449 .4488 .4528
.4567 .4606 .4646
.4685
12
.4724 .4764 .4803
.4843 .4882 .4921
.4961 .5000 .5039
.5079
13
.5118 .5157 .5197
.5236 .5276 .5315
.5354 .5394 .5433
.5472
14
.5512 .5551 .5591
.5630 .5669 .5709
.5748 .5787 .5827
.5866
15
.5906 .5945 .5984
.6024 .6063 .6102
.6142 .6181 .6220
.6260
16
.6299 .6339 .6378
.6417 .6457 .6496
.6535 .6575 .6614
.6654
17
.6693 .6732 .6772
.6811 .6850 .6890
.6929 .6969 .7008
.7047
18
.7087 .7126 .7165
.7205 .7244 .7283
.7323 .7362 .7402
.7441
19
.7480 .7520 .7559
.7598 .7638 .7677
.7717 .7756 .7795
.7835
20
.7874 .7913 .7953
.7992 .8031 .8071
.8110 .8150 .8189
.8228
21
.8268 .8307 .8346
.8386 .8425 .8465
.8504 .8543 .8583
.8622
22
.8661 .8701 .8740
.8780 .8819 .8858
.8898 .8937 .8976
.9016
23
.9055 .9094 .9134
.9173 .9213 .9252
.9291 .9331 .9370
.9409
24
.9449 .9488 .9528
.9567 .9606 .9646
.9685 .9724 .9764
.9803
The following three
rows are the size of wood and sheet metal screws. The first row is the size of
screw followed by the diameter in 0.001 of an inch and threads per inch.
Example a number 10 screw is .190 in diameter and normally has 13 threads per
inch.
0 1
2 3 4 5 6
7 8 9
10 11 12
14 16 18
20 24
60
73 86 99
112 125 138
151 164 177
190 203 216
242 268 294
320 372
32 28 26
24 22 20
18 16 15
14 13 12
11 10 9
8 8 7
The left column is in threads per inch. For taping by hand use 90% to 50% and for power tapping use 80%
through 50%. For most common work use 75%. For
sheet brass, sheet nickel, babbitt,
white metal, hard rubber use 75% to 80%. For mild steel, aluminum, cast iron,
and cast brass use 70% to 75%. For bronze, tool steel, drop forging, stainless
steel, cast steel, nickel, and copper use 65% to 70%. Pick a percent thread to remain and reduce
screw size by the value given in table. A 10-32 has a diameter of .190 for a
75% thread subtract .0304 and arrive at .1596. A #21 drill is .159 which would
be a good choice. A #20 drill is .161 would also work.
THREAD reduce OD of screw by
this amount to obtain required percent of thread
tpi 100%
95% 90% 85%
80% 75% 70%
65% 60% 55%
50%
12
.1083 .1028 .0974
.0920 .0866 .0812
.0758 .0704 .0649
.0595 .0541
13
.0999 .0949 .0899
.0849 .0799 .0749
.0699 .0649 .0600
.0550 .0500
14
.0928 .0881 .0835
.0789 .0742 .0696
.0649 .0603 .0557
.0510 .0464
16
.0812 .0771 .0731
.0690 .0649 .0609
.0568 .0528 .0487
.0447 .0406
18
.0722 .0686 .0649
.0613 .0577 .0541
.0505 .0469 .0433
.0397 .0361
20
.0649 .0617 .0585
.0552 .0520 .0487
.0455 .0422 .0390
.0357 .0325
24
.0541 .0514 .0487
.0460 .0433 .0406
.0379 .0352 .0325
.0298 .0271
28
.0464 .0441 .0418
.0394 .0371 .0348
.0325 .0302 .0278
.0255 .0232
32
.0406 .0386 .0365
.0345 .0325 .0304
.0284 .0264 .0244
.0223 .0203
36
.0361 .0343 .0325
.0307 .0289 .0271
.0253 .0235 .0217
.0198 .0180
40
.0325 .0309 .0292
.0276 .0260 .0244
.0227 .0211 .0195
.0179 .0162
44
.0295 .0280 .0266
.0251 .0236 .0221
.0207 .0192 .0177
.0162 .0148
48
.0271 .0257 .0244
.0230 .0217 .0203
.0189 .0176 .0162
.0149 .0135
56
.0232 .0220 .0209
.0197 .0186 .0174
.0162 .0151 .0139
.0128 .0116
64
.0203 .0193 .0183
.0173 .0162 .0152
.0142 .0132 .0122
.0112 .0101
72
.0180 .0171 .0162
.0153 .0144 .0135
.0126 .0117 .0108
.0099 .0090
80
.0162 .0154 .0146
.0138 .0130 .0122
.0114 .0106 .0097
.0089 .0081
These are the metric threads
mm between threads, thread depth are in inches.
pitch
100%
95% 90% 85%
80% 75% 70%
65% 60% 55%
50%
3.00
.1534 .1458 .1381
.1304 .1227 .1151
.1074 .0997 .0921
.0844 .0767
2.50
.1279 .1215 .1151
.1087 .1023 .0959
.0895 .0831 .0767
.0703 .0639
2.00
.1023 .0972 .0921
.0869 .0818 .0767
.0716 .0665 .0614
.0563 .0511
1.75
.0895 .0850 .0806
.0761 .0716 .0671
.0627 .0582 .0537
.0492 .0448
1.50
.0767 .0729 .0690 .0652 .0614
.0575 .0537 .0499
.0460 .0422 .0384
1.25
.0639 .0607 .0575
.0543 .0511 .0479
.0448 .0416 .0384
.0352 .0320
1.00
.0511 .0486 .0460
.0435 .0409 .0384
.0358 .0332 .0307
.0281 .0256
.90
.0460 .0437 .0414
.0391 .0368 .0345
.0322 .0299 .0276
.0253 .0230
.80
.0409 .0389 .0368
.0348 .0327 .0307
.0286 .0266 .0245
.0225 .0205
.75
.0384 .0364 .0345
.0326 .0307 .0288
.0269 .0249 .0230
.0211 .0192
.70
.0358 .0340 .0322
.0304 .0286 .0269 .0251
.0233 .0215 .0197
.0179
.65
.0332 .0316 .0299
.0283 .0266 .0249
.0233 .0216 .0199
.0183 .0166
.60
.0307 .0292 .0276
.0261 .0245 .0230
.0215 .0199 .0184
.0169 .0153
.55
.0281 .0267 .0253
.0239 .0225 .0211
.0197 .0183 .0169
.0155 .0141
.50
.0256 .0243 .0230
.0217 .0205 .0192
.0179 .0166 .0153
.0141 .0128
.45
.0230 .0219 .0207
.0196 .0184 .0173
.0161 .0150 .0138
.0127 .0115
.40
.0205 .0194 .0184
.0174 .0164 .0153
.0143 .0133 .0123
.0113 .0102
.35
.0179 .0170 .0161
.0152 .0143 .0134
.0125 .0116 .0107
.0098 .0090
.30
.0153 .0146 .0138
.0130 .0123 .0115
.0107 .0100 .0092
.0084 .0077
.25
.0128 .0121 .0115
.0109 .0102 .0096
.0090 .0083 .0077
.0070 .0064
.20
.0102 .0097 .0092
.0087 .0082 .0077
.0072 .0066 .0061
.0056 .0051
drill size drill
size drill size
drill size drill
size
#97
.0059
#96
.0063
#95
.0067
#94
.0071
#93
.0075
#92
.0079
#91
.0083
#90
.0087
#89
.0091
#88
.0094
#87
.0098
#86
.0102
#85
.0110
#84
.0114
#83
.0122
#82
.0126
#81
.0130
#80
.0135
#79
.0145
#78
.0160
#77
.0180
#76
.0200
#75
.0210
#74
.0225
#73
.0240
#72
.0250
#71
.0260
#70
.0280
#69
.0292
#68
.0310
#67
.0320
#66
.0330
#65
.0350
#64
.0360
#63
.0370
#62
.0380
#61
.0390
1.00mm .0394
#60
.0400
#59
.0410
#58
.0420
#57
.0430
1.10mm .0433
#56
.0465
1.20mm .0472
1.30mm .0512
#55
.0520
#54
.0550
1.40mm .0551
1.50mm .0591
#53
.0595
1/16
.0625
1.60mm .0630
#52
.0635
1.70mm .0669
#51
.0670
#50 .0700
1.80mm .0709
#49
.0730
1.90mm .0748
#48
.0760
5/64
.0781
#47
.0785
2.00mm .0787
#46
.0810
#45
.0820
2.10mm .0827
#44
.0860
2.20mm .0866
#43
.0890
2.30mm .0906
#42
.0935
3/32
.0938
2.40mm .0945
#41
.0960
#40
.0980
2.50mm .0984
#39
.0995
#38
.1015
2.60mm .1024
#37
.1040
2.70mm .1063
#36
.1065
7/64
.1094
#35
.1100
2.80mm .1102
#34
.1110
#33
.1130
2.90mm .1142
#32
.1160
3.00mm .1181
#31
.1200
3.10mm .1220
1/ 8
.1250
3.20mm .1260
#30
.1285
3.30mm .1299
3.40mm .1339
#29
.1360
3.50mm .1378
#28
.1405
9/64
.1406
3.60mm .1417
#27
.1440
3.70mm .1457
#26
.1470
#25
.1495
3.80mm .1496
#24
.1520
3.90mm .1535
#23
.1540
5/32
.1563
#22
.1570
4.00mm .1575
#21
.1590
#20
.1610
4.10mm .1614
4.20mm .1654
#19
.1660
4.30mm .1693
#18
.1695
11/64 .1719
#17
.1730
4.40mm .1732
#16 .1770
4.50mm .1772
#15
.1800
4.60mm .1811
#14
.1820
#13
.1850
4.70mm .1850
3/16
.1875
4.80mm .1890
#12
.1890
#11
.1910
4.90mm .1929
#10
.1935
# 9
.1960
5.00mm .1969
# 8
.1990
5.10mm .2008
# 7
.2010
13/64 .2031
# 6
.2040
5.20mm .2047
# 5
.2055
5.30mm .2087
# 4
.2090
5.40mm .2126
# 3
.2130
5.50mm .2165
7/32
.2188
5.60mm .2205
# 2
.2210
5.70mm .2244
# 1
.2280
5.80mm .2283
5.90mm .2323
A
.2340
15/64 .2344
6.00mm .2362
B
.2380
6.10mm .2402
C
.2420
6.20mm .2441
D
.2460
6.30mm .2480
1/ 4
.2500
E
.2500
6.40mm .2520
6.50mm .2559
F
.2570
6.60mm .2598
G
.2610
6.70mm .2638
17/64 .2656
H
.2660
6.80mm .2677
6.90mm .2717
I
.2720
7.00mm .2756
J
.2770
7.10mm .2795
K
.2810
9/32
.2813
7.20mm .2835
7.30mm .2874
L
.2900
7.40mm .2913
M
.2950
7.50mm .2953
19/64 .2969
7.60mm .2992
N
.3020
7.70mm .3031
7.80mm .3071
7.90mm .3110
5/16
.3125
8.00mm .3150
O
.3160
8.10mm .3189
8.20mm .3228
P
.3230
8.30mm .3268
21/64 .3281
8.40mm .3307
Q
.3320
8.50mm .3346
8.60mm .3386
R
.3390
8.70mm .3425
11/32 .3438
8.80mm .3465
S
.3480
8.90mm .3504
9.00mm .3543
T
.3580
9.10mm .3583
23/64 .3594
9.20mm .3622
9.30mm .3661
U
.3680
9.40mm .3701
9.50mm .3740
3/ 8
.3750
V
.3770
9.60mm .3780
9.70mm .3819
9.80mm .3858
W
.3860
9.90mm .3898
25/64 .3906
10.00mm .3937
X
.3970
10.10mm .3976
10.20mm .4016
Y
.4040
10.30mm .4055
13/32 .4063
10.40mm .4094
Z
.4130
10.50mm .4134
10.60mm .4173
10.70mm .4213
27/64 .4219
10.80mm .4252
10.90mm .4291
11.00mm .4331
11.10mm .4370
7/16
.4375
11.20mm .4409
11.30mm .4449
11.40mm .4488
11.50mm .4528
29/64 .4531
11.60mm .4567
11.70mm .4606
11.80mm .4646
11.90mm .4685
15/32 .4688
12.00mm .4724
12.10mm .4764
12.20mm .4803
12.30mm .4843
31/64 .4844
12.40mm .4882
12.50mm .4921
12.60mm .4961
1/ 2
.5000
12.70mm .5000
12.80mm .5039
12.90mm .5079
13.00mm .5118
13.10mm .5157
13.20mm .5197
13.30mm .5236
13.40mm .5276
13.50mm .5315
13.60mm .5354
13.80mm .5433
14.00mm .5512
14.20mm .5591
9/16
.5625
14.40mm .5669
14.50mm .5709
14.60mm .5748
14.80mm .5827
15.00mm .5906
5/ 8
.6250
16.00mm .6299
17.00mm .6693
11/16 .6875
18.00mm .7087
19.00mm .7480
3/ 4
.7500
20.00mm .7874
13/16 .8125
21.00mm .8268
22.00mm .8661
7/ 8
.8750
23.00mm .9055
15/16 .9375
24.00mm .9449
25.00mm .9843
This table is for the most
commonly used screw sizes. For taping by hand use 90% to 50%
and for power tapping use 80% through 50%. For most
common work use 75%. For sheet brass, sheet nickel, babbitt, white metal, hard rubber use 75% to 80%. For
mild steel, aluminum, cast iron, and cast brass use 70% to 75%. For bronze,
tool steel, drop forging, stainless steel, cast steel, nickel, and copper use
65% to 70%. In the table below the “screw” is the type of screw. The “size” is
the outside diameter of screw. The 100% to 50% are the percent of threads remaining
after tapping the hole drilled out.
screw size
100% 95% 90%
85% 80% 75%
70% 65% 60%
55% 50%
4 40
.1120 .0795 .0811 .0828 .0844
.0860 .0876 .0893 .0909 .0925 .0941 .0958
6 32
.1380 .0974 .0994 .1015 .1035
.1055 .1076 .1096 .1116 .1136 .1157 .1177
8 32
.1640 .1234 .1254 .1275 .1295
.1315 .1336 .1356 .1376 .1396 .1417 .1437
10 24
.1900 .1359 .1386 .1413 .1440
.1467 .1494 .1521 .1548 .1575 .1602 .1629
10 32
.1900 .1494 .1514 .1535 .1555
.1575 .1596 .1616 .1636 .1656 .1677 .1697
12 24
.2160 .1619 .1646 .1673 .1700
.1727 .1754 .1781 .1808 .1835 .1862 .1889
1/4 20
.2500 .1850 .1883 .1915 .1948
.1980 .2013 .2045 .2078 .2110 .2143 .2175
1/4 28
.2500 .2036 .2059 .2082 .2106
.2129 .2152 .2175 .2198 .2222 .2245 .2268
5/16 18 .3125
.2403 .2439 .2475 .2512 .2548 .2584 .2620 .2656 .2692 .2728 .2764
5/16 24 .3125
.2584 .2611 .2638 .2665 .2692 .2719 .2746 .2773 .2800 .2827 .2854
3/8 16
.3750 .2938 .2979 .3019 .3060
.3100 .3141 .3182 .3222 .3263 .3303 .3344
3/8 24
.3750 .3209 .3236 .3263 .3290
.3317 .3344 .3371 .3398 .3425 .3452 .3479
7/16 14 .4375
.3447 .3494 .3540 .3586 .3633 .3679 .3725 .3772 .3818 .3865 .3911
7/16 20 .4375
.3725 .3758 .3790 .3823 .3855 .3888 .3920 .3953 .3985 .4018 .4050
1/2 13
.5000 .4001 .4051 .4101 .4151
.4201 .4251 .4301 .4350 .4400 .4450 .4500
1/2 20
.5000 .4350 .4383 .4415 .4448
.4480 .4513 .4545 .4578 .4610 .4643 .4675
M 3 0.50
.1181 .0925 .0938 .0951 .0964
.0977 .0989 .1002 .1015 .1028 .1040 .1053
M 4 0.70
.1575 .1217 .1235 .1253 .1271
.1288 .1306 .1324 .1342 .1360 .1378 .1396
M 5 0.80
.1969 .1559 .1580 .1600 .1621
.1641 .1662 .1682 .1703 .1723 .1743 .1764
M 5 0.90
.1969 .1508 .1531 .1554 .1577
.1600 .1623 .1646 .1669 .1692 .1715 .1738
M 6 0.75
.2362 .1979 .1998 .2017 .2036
.2055 .2075 .2094 .2113 .2132 .2151 .2170
M 6 1.00
.2362 .1851 .1876 .1902 .1927
.1953 .1979 .2004 .2030 .2055 .2081 .2106
M 8 1.00
.3150 .2638 .2664 .2689 .2715
.2740 .2766 .2792 .2817 .2843 .2868 .2894
M 8 1.25
.3150 .2510 .2542 .2574 .2606
.2638 .2670 .2702 .2734 .2766 .2798 .2830
M 10 1.25 .3937
.3298 .3330 .3362 .3394 .3426 .3458 .3490 .3521 .3553 .3585 .3617
M 10 1.50 .3937
.3170 .3208 .3247 .3285 .3323 .3362 .3400 .3438 .3477 .3515 .3553
M 12 1.50 .4724
.3957 .3996 .4034 .4072 .4111 .4149 .4187 .4226 .4264 .4302 .4341
M 12 1.75 .4724
.3829 .3874 .3919 .3964 .4008 .4053 .4098 .4143 .4187 .4232 .4277
drill size drill
size drill size
drill size drill
size
#60 .0400
#59 .0410
#58 .0420
#57 .0430
#56 .0465
#55 .0520
#54 .0550
#53 .0595
1/16 .0625
#52 .0635
#51 .0670
#50 .0700
#49 .0730
#48 .0760
5/64 .0781
#47 .0785
#46 .0810
#45 .0820
#44 .0860
#43 .0890
#42 .0935
3/32 .0938
#41 .0960
#40 .0980
#39 .0995
#38 .1015
#37 .1040
#36 .1065
7/64 .1094
#35 .1100
#34 .1110
#33 .1130
#32 .1160
#31 .1200
1/ 8 .1250
#30 .1285
#29 .1360
#28 .1405
9/64 .1406
#27 .1440
#26 .1470
#25 .1495
#24 .1520
#23 .1540
5/32 .1563
#22 .1570
#21 .1590
#20 .1610
#19 .1660
#18 .1695
11/64
.1719
#17 .1730
#16 .1770
#15 .1800
#14 .1820
#13 .1850
3/16 .1875
#12 .1890
#11 .1910
#10 .1935
# 9 .1960
# 8 .1990
# 7 .2010
13/64
.2031
# 6 .2040
# 5 .2055
# 4 .2090
# 3 .2130
7/32 .2188
# 2 .2210
# 1 .2280
A .2340
15/64
.2344
B .2380
C .2420
D .2460
1/ 4 .2500
E .2500
F .2570
G .2610
17/64
.2656
H .2660
I .2720
J .2770
K .2810
9/32 .2813
L .2900
M .2950
19/64
.2969
N .3020
5/16 .3125
O .3160
P .3230
21/64
.3281
Q .3320
R .3390
11/32
.3438
S .3480
T .3580
23/64
.3594
U .3680
3/ 8 .3750
V .3770
W .3860
25/64
.3906
X .3970
Y .4040
13/32
.4063
Z .4130
27/64
.4219
7/16 .4375
29/64
.4531
15/32
.4688
31/64
.4844
1/ 2 .5000
107 0.0019
106 0.0023
105 0.0027
104 0.0031
103 0.0035
102 0.0039
101 0.0043
100 0.0047
99 0.0051
98 0.0055
97 0.0059
96 0.0063
95 0.0067
94 0.0071
93 0.0075
92 0.0079
.2mm 0.0079
91 0.0083
90 0.0087
.22mm 0.0087
89 0.0091
88 0.0095
.25mm 0.0098
87 0.0100
86 0.0105
85 0.0110
.28mm 0.0110
84 0.0115
.3mm 0.0118
83 0.0120
82 0.0125
.32mm 0.0126
81 0.0130
80 0.0135
.35mm 0.0138
79 0.0145
1/64 0.0156
.4mm 0.0157
78 0.0160
.45mm 0.0177
77 0.0180
.5mm 0.0197
76 0.0200
75 0.0210
.55mm 0.0217
74 0.0225
.6mm 0.0236
73 0.0240
72 0.0250
.65mm 0.0256
71 0.0260
.7mm 0.0276
70 0.0280
69 0.0292
.75mm 0.0295
68 0.0310
1/32 0.0312
.8mm 0.0315
67 0.0320
66 0.0330
.85mm 0.0335
65 0.0350
.9mm 0.0354
64 0.0360
63 0.0370
.95mm 0.0374
62 0.0380
61 0.0390
1mm 0.0394
60 0.0400
59 0.0410
1.05mm 0.0413
58 0.0420
57 0.0430
1.1mm 0.0433
1.15mm 0.0453
56 0.0465
3/64 0.0469
1.2mm 0.0472
1.25mm 0.0492
1.3mm 0.0512
55 0.0520
1.35mm 0.0531
54 0.0550
1.4mm 0.0551
1.45mm 0.0571
1.5mm 0.0591
53 0.0595
1.55mm 0.0610
1/16 0.0625
52 0.0635
1.65mm 0.0650
1.7mm 0.0669
51 0.0670
1.75mm 0.0689
50 0.0700
1.8mm 0.0709
1.85mm 0.0728
49 0.0730
1.9mm 0.0748
48 0.0760
1.95mm 0.0768
5/64 0.0781
2mm 0.0787
2.05mm 0.0807
47 0.0785
46 0.0810
45 0.0820
2.1mm 0.0827
2.15mm 0.0846
44 0.0860
2.2mm 0.0866
2.25mm 0.0886
43 0.0890
2.3mm 0.0906
2.35mm 0.0925
42 0.0935
3/32 0.0938
2.4mm 0.0945
41 0.0960
2.45mm 0.0965
40 0.0980
2.5mm 0.0984
39 0.0995
38 0.1015
2.6mm 0.1024
37 0.1040
2.7mm 0.1063
36 0.1065
2.75mm 0.1083
7/64 0.1094
35 0.1100
2.8mm 0.1102
34 0.1110
33 0.1130
2.9mm 0.1142
32 0.1160
3mm 0.1181
31 0.1200
3.1mm 0.1181
1/8 0.1250
30 0.1285
3.3mm 0.1299
3.4mm 0.1339
29 0.1360
3.5mm 0.1378
28 0.1405
9/64 0.1406
3.6mm 0.1417
27 0.1440
3.7mm 0.1457
26 0.1470
3.75mm 0.1476
25 0.1495
3.8mm 0.1535
24 0.1520
3.9mm 0.1535
23 0.1540
5/32 0.1562
22 0.1570
4mm 0.1575
21 0.1590
20 0.1610
4.1mm 0.1614
4.2mm 0.1654
19 0.1660
4.25mm 0.1673
4.3mm 0.1693
18 0.1695
11/64 0.1719
17 0.1730
4.4mm 0.1732
16 0.1770
4.5mm 0.1772
15 0.1800
4.6mm 0.1811
14 0.1820
13 0.1850
4.7mm 0.1850
4.75mm 0.1870
3/16 0.1875
4.8mm 0.1890
12 0.1890
11 0.1910
4.9mm 0.1929
10 0.1935
9 0.1960
5.mm 0.1969
8 0.1990
5.1mm 0.2008
7 0.2010
13/64 0.2031
6 0.2040
5.2mm 0.2047
5 0.2055
5.25mm 0.2067
5.3mm 0.2087
4 0.2090
5.4mm 0.2126
3 0.2130
5.5mm 0.2165
7/32 0.2188
5.6mm 0.2205
2 0.2211
5.7mm 0.2244
5.75mm 0.2264
1 0.2280
5.8mm 0.2283
5.9mm 0.2323
A 0.2340
15/64 0.2344
6mm 0.2362
B 0.2380
6.1mm 0.2402
C 0.2420
6.2mm 0.2441
D 0.2460
6.25mm 0.2461
6.3mm 0.2480
1/4 0.2500
E 0.2500
6.4mm 0.2520
6.5mm 0.2559
F 0.2570
6.6mm 0.2598
G 0.2610
6.7mm 0.2638
17/64 0.2656
6.75mm 0.2657
H 0.2660
6.8mm 0.2677
6.9mm 0.2717
I 0.2720
7mm 0.2756
J 0.2770
7.1mm 0.2795
K 0.2810
9/32 0.2812
7.2mm 0.2835
7.25mm 0.2854
7.3mm 0.2874
L 0.2900
7.4mm 0.2913
M 0.2950
7.5mm 0.2953
19/64 0.2969
7.6mm 0.2992
N 0.3020
7.7mm 0.3031
7.75mm 0.3051
7.8mm 0.3071
7.9mm 0.3110
5/16 0.3125
8mm 0.3150
O 0.3160
8.1mm 0.3189
8.2mm 0.3228
P 0.3230
8.25mm 0.3248
8.3mm 0.3268
21/64 0.3281
8.4mm 0.3307
Q 0.3320
8.5mm 0.3346
8.6mm 0.3386
R 0.3390
8.7mm 0.3425
11/32 0.3438
8.75mm 0.3445
8.8mm 0.3465
S 0.3480
8.9mm 0.3504
9mm 0.3543
T 0.3580
9.1mm 0.3583
23/64 0.3594
9.2mm 0.3622
9.25mm 0.3642
9.3mm 0.3661
U 0.3680
9.4mm 0.3701
9.5mm 0.3740
3/8 0.3750
V 0.3770
9.6mm 0.3780
9.7mm 0.3819
9.75mm 0.3839
9.8mm 0.3858
W 0.3860
9.9mm 0.3898
25/64 0.3906
10mm 0.3937
X 0.3970
Y 0.4040
13/32 0.4062
Z 0.4130
10.5mm 0.4134
27/64 0.4219
11mm 0.4331
7/16 0.4375
11.5mm 0.4528
29/64 0.4531
15/32 0.4688
12mm 0.4724
31/64 0.4844
1/2 0.5000
33/64 0.5156
17/32 0.5312
13.5mm 0.5315
35/64 0.5469
14mm 0.5512
9/16 0.5625
14.5mm 0.5709
37/64 0.5781
15mm 0.5906
19/32 0.5938
39/64 0.6094
15.5mm 0.6102
5/8 0.6250
16mm 0.6299
41/64 0.6406
16.5mm 0.6496
21/32 0.6562
17mm 0.6693
43/64 0.6719
11/16 0.6875
17.5mm 0.6890
45/64 0.7031
18mm 0.7087
23/32 0.7188
18.5mm 0.7283
47/64 0.7344
19mm 0.7480
3/4 0.7500
49/64 0.7656
19.5mm 0.7677
25/32 0.7812
20mm 0.7874
51/64 0.7969
20.5mm 0.8071
13/16 0.8125
21mm 0.8268
53/64 0.8281
27/32 0.8438
21.5mm 0.8465
55/64 0.8594
22mm 0.8661
7/8 0.8750
22.5mm 0.8858
57/64 0.8906
23mm 0.9055
29/32 0.9062
59/64 0.9219
23.5mm 0.9252
15/16 0.9375
24mm 0.9449
61/64 0.9531
24.5mm 0.9646
31/32 0.9688
25mm 0.9843
63/64 0.9844
1 1.0000