| D | J | M | L | T | ||
|---|---|---|---|---|---|---|
| Nominal Size or Basic Screw Diameter | Thread Pitch | Hexagon Socket Size | Spline Socket Size | Nominal Screw Lengths | Minimum Key Engagement | |
| Flat Points | ||||||
| Hex. Th |
Spl. Ts |
|||||
| Nom. | Nom. | Min. | Min. | |||
| 1.6 | 0.35 | 0.7 | 0.84 | 1.5 | 0.6 | 0.6 |
| 2 | 0.8 | 0.7 | ||||
| 2.5 | 1.0 | 0.7 | ||||
| 3 | 1.25 | 0.7 | ||||
| 2 | 0.4 | 0.9 | 0.84 | 1.5 | 0.6 | 0.6 |
| 2 | 0.8 | 0.7 | ||||
| 2.5 | 1.0 | 0.7 | ||||
| 3 | 1.2 | 0.7 | ||||
| 4 | 1.5 | 0.7 | ||||
| 2.5 | 0.45 | 1.3 | 1.22 | 2 | 0.7 | 0.7 |
| 2.5 | 1.1 | 1.0 | ||||
| 3 | 1.5 | 1.0 | ||||
| 4 | 1.8 | 1.0 | ||||
| 3 | 0.5 | 1.5 | 1.52 | 2 | 0.6 | 0.6 |
| 2.5 | 1.1 | 1.1 | ||||
| 3 | 1.5 | 1.2 | ||||
| 4 | 2.1 | 1.2 | ||||
| 5 | 2.1 | 1.2 | ||||
| 4 | 0.7 | 2 | 2.44 | 2.5 | 1.0 | 1.0 |
| 3 | 1.3 | 1.3 | ||||
| 4 | 1.8 | 1.8 | ||||
| 5 | 2.3 | 2.0 | ||||
| 6 | 2.3 | 2.0 | ||||
| 5 | 0.8 | 2.5 | 2.82 | 3 | 1.2 | 1.2 |
| 4 | 2.0 | 2.0 | ||||
| 5 | 2.7 | 2.3 | ||||
| 6 | 2.7 | 2.3 | ||||
| 8 | 2.7 | 2.3 | ||||
| 6 | 1 | 3 | 3.68 | 4 | 1.8 | 1.8 |
| 5 | 2.5 | 2.5 | ||||
| 6 | 3.0 | 3.0 | ||||
| 8 | 3.0 | 3.0 | ||||
| 8 | 1.25 | 4 | 4.65 | 5 | 1.8 | 1.8 |
| 6 | 2.5 | 2.5 | ||||
| 8 | 4.0 | 4.0 | ||||
| 10 | 4.0 | 4.0 | ||||
| 10 | 1.5 | 5 | 5.49 | 6 | 2.0 | 2.0 |
| 8 | 3.6 | 3.6 | ||||
| 10 | 5.0 | 5.0 | ||||
| 12 | 5.0 | 5.0 | ||||
| 12 | 1.75 | 6 | 6.38 | 8 | 3.0 | 3.0 |
| 10 | 4.5 | 4.5 | ||||
| 12 | 6.0 | 6.0 | ||||
| 16 | 6.0 | 6.0 | ||||
| 16 | 2 | 8 | 9.45 | 10 | 3.0 | 3.0 |
| 12 | 4.8 | 4.8 | ||||
| 16 | 8.0 | 8.0 | ||||
| 20 | 8.0 | 8.0 | ||||
| 20 | 2.5 | 10 | 11.53 | 12 | ... | ... |
| 16 | 6.0 | 6.0 | ||||
| 20 | 9.0 | 9.0 | ||||
| 25 | 10.0 | 10.0 | ||||
| 24 | 3 | 12 | 15.11 | 16 | 5.0 | 5.0 |
| 20 | 8.0 | 8.0 | ||||
| 25 | 12.0 | 12.0 | ||||
| 30 | 12.0 | 12.0 | ||||
| D | C2 | |
|---|---|---|
| Nominal Size or Basic Screw | ||
| Flat Point Diameter | ||
| Max. | Min. | |
| 1.6 | 0.80 | 0.55 |
| 2 | 1.00 | 0.75 |
| 2.5 | 1.50 | 1.25 |
| 3 | 2.00 | 1.75 |
| 4 | 2.50 | 2.25 |
| 5 | 3.50 | 3.20 |
| 6 | 4.00 | 3.70 |
| 8 | 5.50 | 5.20 |
| 10 | 7.00 | 6.64 |
| 12 | 8.50 | 8.14 |
| 16 | 12.00 | 11.57 |
| 20 | 15.00 | 14.57 |
| 24 | 18.00 | 17.57 |
| Nominal Socket Size | J | C | |
|---|---|---|---|
| Dimensions Across Flats | Dimensions Across Corners | ||
| Max. | Min. | Min. | |
| 0.7 | 0.724 | 0.711 | 0.803 |
| 0.9 | 0.902 | 0.889 | 1.003 |
| 1.3 | 1.295 | 1.270 | 1.427 |
| 1.5 | 1.545 | 1.520 | 1.730 |
| 2 | 2.045 | 2.020 | 2.300 |
| 2.5 | 2.560 | 2.520 | 2.870 |
| 3 | 3.071 | 3.020 | 3.440 |
| 4 | 4.084 | 4.020 | 4.580 |
| 5 | 5.084 | 5.020 | 5.720 |
| 6 | 6.095 | 6.020 | 6.860 |
| 8 | 8.115 | 8.025 | 9.150 |
| 10 | 10.127 | 10.025 | 11.500 |
| 12 | 12.146 | 12.032 | 13.800 |
Measurement: The length of the screw shall be measured overall, parallel to the axis of screw.
Tolerance on Length: The tolerance on screw length shall be as tabulated below:
| Nominal Screw Length, mm | Tolerance on Length, mm |
|---|---|
| Up to 12, incl. | ±0.3 |
| Over 12 to 50, incl. | ±0.5 |
| Over 50 | ±0.8 |
Standard Lengths:The standard nominal screw lengths are 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, and 100 mm. The minimum practical screw length for the respective screw sizes and point styles is represented by the short- est lengths listed in Table 1 for which T values are shown.
