Standard Threads
Internal Threads
| Thread | Hole Diameter(in) | Max Thread Depth(in) |
|---|---|---|
| 0-80 UNC | 0.047 | 0.157 |
| 1-64 UNC | 0.059 | 0.177 |
| 2-56 UNC | 0.070 | 0.306 |
| 2-64 UNF | 0.070 | 0.306 |
| 4-40 UNC | 0.089 | 0.394 |
| 4-48 UNF | 0.094 | 0.394 |
| 5-40 UNC | 0.102 | 0.438 |
| 5-44 UNF | 0.104 | 0.438 |
| 6-32 UNC | 0.107 | 0.481 |
| 6-40 UNF | 0.113 | 0.481 |
| 8-32 UNC | 0.136 | 0.525 |
| 8-36 UNF | 0.136 | 0.525 |
| 10-24 UNC | 0.150 | 0.612 |
| 10-32 UNF | 0.159 | 0.612 |
| 1/4-20 UNC | 0.201 | 0.750 |
| 1/4-28 UNF | 0.213 | 0.750 |
| 5/16-18 UNC | 0.257 | 0.844 |
| 5/16-24 UNF | 0.272 | 0.844 |
| 3/8-16 UNC | 0.313 | 0.938 |
| 3/8-24 UNF | 0.332 | 0.938 |
| 7/16-14 UNC | 0.368 | 1.078 |
| 7/16-20 UNF | 0.391 | 1.078 |
| 1/2-13 UNC | 0.422 | 1.242 |
| 1/2-20 UNF | 0.453 | 1.242 |
| 9/16-12 UNC | 0.484 | 1.250 |
| 9/16-18 UNF | 0.500 | 1.250 |
| 5/8-11 UNC | 0.531 | 1.250 |
| 5/8-18 UNF | 0.563 | 1.250 |
| 3/4-10 UNC | 0.656 | 1.250 |
| 3/4-16 UNF | 0.688 | 1.250 |
| Metric | Hole Diameter(in) | Max Thread Depth(in) |
|---|---|---|
| M2x0.4 | 0.063 | 0.306 |
| M2.5×0.45 | 0.081 | 0.350 |
| M3x0.5 | 0.098 | 0.438 |
| M3.5×0.6 | 0.114 | 0.481 |
| M4x0.7 | 0.130 | 0.525 |
| M5x0.8 | 0.165 | 0.612 |
| M6x1.0 | 0.197 | 0.750 |
| M8x1.25 | 0.264 | 0.900 |
| M10x1.5 | 0.335 | 0.938 |
| M12x1.75 | 0.402 | 1.242 |
| STI Threads | Hole Diameter(in) | Max Thread Depth(in) |
|---|---|---|
| 2-56 UNC | 0.091 | 0.306 |
| 4-40 UNC | 0.118 | 0.394 |
| 4-48 UNF | 0.118 | 0.394 |
| 5-40 UNC | 0.134 | 0.438 |
| 6-32 UNC | 0.146 | 0.481 |
| 8-32 UNC | 0.172 | 0.525 |
| 8-36 UNF | 0.172 | 0.525 |
| 10-24 UNC | 0.201 | 0.612 |
| 10-32 UNF | 0.201 | 0.612 |
| 1/4-20 UNC | 0.264 | 0.750 |
| M2x0.4 | 0.083 | 0.306 |
| M2.5×0.45 | 0.104 | 0.350 |
| M3x0.5 | 0.126 | 0.438 |
| M4x0.7 | 0.167 | 0.525 |
| M5x0.8 | 0.209 | 0.612 |
| M6x1.0 | 0.248 | 0.750 |
| M8x1.25 | 0.331 | 0.900 |
| M10x1.5 | 0.413 | 0.938 |
| M12x1.75 | 0.492 | 1.242 |
External Threads
| Thread | Boss Diameter (in) | Max Thread Length (in) |
|---|---|---|
| UNC/UNF | ||
| 2-56 UNC | 0.086 | 0.20 |
| 2-64 UNF | 0.086 | 0.20 |
| 4-40 UNC | 0.112 | 0.22 |
| 4-48 UNF | 0.112 | 0.22 |
| 5-40 UNC | 0.125 | 0.25 |
| 5-44 UNF | 0.125 | 0.25 |
| 6-32 UNC | 0.138 | 0.28 |
| 6-40 UNF | 0.138 | 0.28 |
| 8-32 UNC | 0.164 | 0.33 |
| 8-36 UNF | 0.164 | 0.33 |
| 10-24 UNC | 0.190 | 0.38 |
| 10-32 UNF | 0.190 | 0.38 |
| 1/4-20 UNC | 0.250 | 0.50 |
| 1/4-28 UNF | 0.250 | 0.50 |
| 5/16-18 UNC | 0.313 | 0.675 |
| 5/16-24 UNF | 0.313 | 0.675 |
| 3/8-16 UNC | 0.375 | 0.75 |
| 3/8-24 UNF | 0.375 | 0.75 |
| 7/16-14 UNC | 0.438 | 0.875 |
| 7/16-20 UNF | 0.438 | 0.875 |
| 1/2-13 UNC | 0.500 | 1.00 |
| 1/2-20 UNF | 0.500 | 1.00 |
| 9/16-12 UNC | 0.563 | 1.25 |
| 9/16-18 UNF | 0.563 | 1.25 |
| 5/8-11 UNC | 0.625 | 1.25 |
| 5/8-18 UNF | 0.625 | 1.25 |
| 3/4-10 UNC | 0.750 | 1.50 |
| 3/4-16 UNF | 0.750 | 1.50 |
| 7/8-9 UNC | 0.875 | 2.00 |
| 7/8-14 UNF | 0.875 | 2.00 |
| 1″-8 UNC | 1.000 | 2.50 |
| 1″-12 UNF | 1.000 | 2.50 |
| Metric | Boss Diameter (in) | Max Thread Length (in) |
|---|---|---|
| M2x0.4 | 0.079 | 0.276 |
| M2.5×0.45 | 0.098 | 0.276 |
| M3x0.5 | 0.118 | 0.276 |
| M3.5×0.6 | 0.138 | 0.276 |
| M4x0.7 | 0.157 | 0.500 |
| M5x0.8 | 0.197 | 0.500 |
| M6x1.0 | 0.236 | 0.500 |
| M8x1.25 | 0.315 | 0.500 |
| M10x1.5 | 0.394 | 1.000 |
| M12x1.75 | 0.472 | 1.000 |
| M14x2.0 | 0.551 | 1.500 |
| M16x2.5 | 0.630 | 1.500 |
| M24x3.0 | 0.945 | 2.000 |
