Drill and screw dimensions
Table D.1
English sizes.
| Screw size no. or diam. | Threads (/in.) | Clearance hole (drill diameter) | Min (in.) | Drill bit gauge | Min (in.) | Head diam. typ (in.) | Washer diam. typ (in.) | Nut size (in.) |
|---|
| Close fit | Normal fit | Loose fit |
|---|
| Drill bit gauge | Min (in.) | Drill bit gauge |
|---|
| 0 |
80 |
No.51 |
0.067 |
No.48 |
0.079 |
3/32 |
0.104 |
0.116 |
0.188 |
5/32 |
| 1 |
72 or 64 |
No.46 |
0.081 |
No.43 |
0.092 |
No.37 |
0.114 |
0.141 |
0.219 |
5/32 |
| 2 |
64 or 56 |
3/32 |
0.094 |
No.38 |
0.105 |
No.32 |
0.126 |
0.167 |
0.250 |
3/16 |
| 3 |
56 or 48 |
No.36 |
0.106 |
No.32 |
0.119 |
No.30 |
0.140 |
0.193 |
0.312 |
3/16 |
| 4 |
48 or 40 |
No.31 |
0.120 |
No.30 |
0.130 |
No.27 |
0.156 |
0.219 |
0.375 |
1/4 |
| 5 |
44 or 40 |
9/64 |
0.141 |
5/32 |
0.160 |
11/64 |
0.184 |
0.245 |
0.406 |
1/4 |
| 6 |
40 or 32 |
No.23 |
0.154 |
No.18 |
0.174 |
No.13 |
0.197 |
0.270 |
0.438 |
5/16 |
| 8 |
36 or 32 |
No.15 |
0.180 |
No.9 |
0.200 |
No.3 |
0.225 |
0.322 |
0.445 |
11/32 |
| 10 |
32 or 24 |
No.5 |
0.206 |
No.2 |
0.225 |
B |
0.250 |
0.373 |
0.500 |
3/8 |
| 1/4 |
28 or 20 |
17/64 |
0.266 |
9/32 |
0.286 |
19/64 |
0.311 |
0.492 |
0.625 |
7/16 |
| 5/16 |
24 or 18 |
21/64 |
0.328 |
11/32 |
0.349 |
23/64 |
0.373 |
0.615 |
0.688 |
9/16 |
| 3/8 |
24 or 16 |
25/64 |
0.391 |
13/32 |
0.411 |
27/64 |
0.438 |
0.740 |
0.813 |
5/8 |
Table D.2
Metric sizes (mm).
| Screw size | Pitch (mm) | Clearance hole fit | Head, nut size | Washer diameter |
|---|
| Close | Normal | Loose |
|---|
| M 1.6 |
0.4 |
1.7 |
1.8 |
2.0 |
2.9 |
3.2 |
| M 2.0 |
0.4 |
2.2 |
2.4 |
2.6 |
3.6 |
4.0 |
| M 2.5 |
0.5 |
2.7 |
2.9 |
3.1 |
4.5 |
5.0 |
| M 3.0 |
0.5 |
3.2 |
3.4 |
3.6 |
5.4 |
6.0 |
| M 4.0 |
0.7 |
4.3 |
4.5 |
4.8 |
7.2 |
8.0 |
| M 5.0 |
0.8 |
5.3 |
5.5 |
5.8 |
9.0 |
10.0 |
| M 6.0 |
1.0 |
6.4 |
6.6 |
7.0 |
10.8 |
12.0 |
| M 8.0 |
1.3 |
8.4 |
9.0 |
10.0 |
14.4 |
16.0 |
| M 10 |
1.5 |
10.5 |
11.0 |
12.0 |
18.0 |
20.0 |
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