Screw Size & Decimal Equivalent Charts
|
Screw Size
|
Tap Drill
|
Maximum Screw Diameter
|
|
|
Size
|
Diameter
|
|
|
000-120
|
#71
|
.026
|
.034
|
|
00-90
|
#62
|
.038
|
.047
|
|
0-80
|
#56
|
.0465 |
.060 |
|
1-72
|
#53
|
.0595
|
.073
|
|
2-56
|
#50
|
.070
|
.086
|
|
3-48
|
#47
|
.0785
|
.099
|
|
4-40
|
#43
|
.089
|
.112
|
|
5-40
|
#38
|
.1015
|
.125
|
|
6-32
|
#36
|
.1065
|
.138
|
|
8-32
|
#29
|
.136
|
.164
|
|
10-24
|
#25
|
.1495
|
.190
|
|
10-32
|
#21
|
.159
|
.190
|
|
12-24
|
#16
|
.177
|
.216
|
Decimal Equivalents
|
1/64 —.0156
|
17/64 —.2656
|
33/64 —.5156
|
49/64 —.7656
|
|
1/32 —.0312
|
9/32 —.2812
|
17/32 —.5312
|
25/32 —.7812
|
|
3/64 —.0468
|
19/64 —.2969
|
35/64 —.5469
|
51/64 —.7969
|
|
1/16 —.0625
|
5/16 —.3125
|
9/16 —.5625
|
13/16 —.8125
|
|
5/64 —.0781
|
21/64 —.3281
|
37/64 —.5781
|
53/64 —.8281
|
|
3/32 —.0937
|
11/32 —.3437
|
19/32 —.5937
|
27/32 —.8437
|
|
7/64 —.1094
|
23/64 —.3594
|
39/64 —.6094
|
55/64 —.8594
|
|
1/8 —.1250
|
3/8 —.3750
|
5/8 —.6250
|
7/8 —.8750
|
|
9/64 —.1406
|
25/64 —.3906
|
41/64 —.6406
|
57/64 —.8906
|
|
5/32 —.1562
|
13/32 —.4062
|
21/32 —.6562
|
29/32 —.9062
|
|
11/64 —.1719
|
27/64 —.4219
|
43/64 —.6719
|
59/64 —.9219
|
|
3/16 —.1875
|
7/16 —.4375
|
11/16 —.6875
|
15/16 —.9375
|
|
13/64 —.2031
|
29/64 —.4531
|
45/64 —.7031
|
61/64 —.9531
|
|
7/32 —.2187
|
15/32 —.4687
|
23/32 —.7187
|
31/32 —.9687
|
|
15/64 —.2344
|
31/64 —.4844
|
47/64 —.7344
|
63/64 —.9843
|
|
1/4 —.2500
|
1/2 —.5000
|
3/4 —.7500
|
1 —1.000
|
|