Mechanical Screw Data
This page provides data on typical mechanical screw/thread sizes.
Size | Threads / inch | Major Diameter (in.) | Minor Diameter (in.) | Lead Angle (Deg.) | Lead Angle (Min.) |
---|---|---|---|---|---|
1 | 64 | 0.073 | 0.056 | 4 | 31 |
2 | 56 | 0.086 | 0.067 | 4 | 22 |
3 | 48 | 0.099 | 0.076 | 4 | 26 |
4 | 40 | 0.112 | 0.085 | 4 | 45 |
5 | 40 | 0.125 | 0.098 | 4 | 11 |
6 | 32 | 0.138 | 0.101 | 4 | 50 |
8 | 32 | 0.164 | 0.13 | 3 | 58 |
10 | 24 | 0.19 | 0.145 | 4 | 39 |
12 | 24 | 0.216 | 0.171 | 4 | 1 |
1/4 | 20 | 0.25 | 0.196 | 4 | 11 |
5/16 | 18 | 0.313 | 0.252 | 3 | 40 |
3/8 | 16 | 0.375 | 0.307 | 3 | 24 |
7/16 | 14 | 0.438 | 0.36 | 3 | 20 |
1/2 | 13 | 0.5 | 0.417 | 3 | 7 |
9/16 | 12 | 0.563 | 0.472 | 2 | 59 |
5/8 | 11 | 0.625 | 0.527 | 2 | 56 |
3/4 | 10 | 0.75 | 0.642 | 2 | 40 |
7/8 | 9 | 0.875 | 0.755 | 2 | 31 |
1 | 8 | 1 | 0.865 | 2 | 29 |
Size | Threads / inch | Major Diameter (in.) | Minor Diameter (in.) | Lead Angle (Deg.) | Lead Angle (Min.) |
---|---|---|---|---|---|
0 | 80 | 0.06 | 0.465 | 4 | 23 |
1 | 72 | 0.073 | 0.058 | 3 | 57 |
2 | 64 | 0.086 | 0.069 | 3 | 45 |
3 | 56 | 0.099 | 0.08 | 3 | 43 |
4 | 48 | 0.112 | 0.089 | 3 | 51 |
5 | 44 | 0.125 | 0.1 | 3 | 45 |
6 | 40 | 0.138 | 0.111 | 3 | 44 |
8 | 36 | 0.164 | 0.134 | 3 | 28 |
10 | 32 | 0.19 | 0.156 | 3 | 21 |
12 | 28 | 0.216 | 0.177 | 3 | 22 |
1/4 | 28 | 0.25 | 0.211 | 2 | 52 |
5/16 | 24 | 0.313 | 0.267 | 2 | 40 |
3/8 | 24 | 0.375 | 0.33 | 2 | 11 |
7/16 | 20 | 0.438 | 0.338 | 2 | 15 |
1/2 | 20 | 0.5 | 0.446 | 1 | 57 |
9/16 | 18 | 0.563 | 0.502 | 1 | 55 |
5/8 | 18 | 0.625 | 0.565 | 1 | 43 |
3/4 | 16 | 0.75 | 0.682 | 1 | 36 |
7/8 | 14 | 0.875 | 0.798 | 1 | 34 |
1 | 12 | 1 | 0.91 | 1 | 36 |