Inch series · technical reference
Cup Point Socket Set Screw Dimensions
Reference geometry for inch-series hexagon socket set screws with a cup point. Cup, cone, flat and dog points are separate forms and must not be substituted from this table.
Source: ASME B18.3.
CAD ORTHOGRAPHIC REFERENCEASME B18.3.5D · INCH SERIES REFERENCE
Reference size shown: 1/4-20 UNC. The drawing identifies dimension locations only. Use the table for nominal data and confirm the exact product configuration before ordering.
| Nominal size | TPI | T — key engagement | C — cup Ø | J — socket size |
|---|---|---|---|---|
| #4 | 40 | 0.070 min | 0.051 – 0.061 | 0.050 |
| #6 | 32 | 0.080 min | 0.064 – 0.074 | 0.062 |
| #8 | 32 | 0.090 min | 0.076 – 0.087 | 0.078 |
| #10 | 24 | 0.100 min | 0.088 – 0.102 | 0.094 |
| 1/4 in | 20 | 0.125 min | 0.118 – 0.132 | 0.125 |
| 5/16 in | 18 | 0.156 min | 0.156 – 0.172 | 0.156 |
| 3/8 in | 16 | 0.188 min | 0.194 – 0.212 | 0.188 |
| 7/16 in | 14 | 0.219 min | 0.232 – 0.252 | 0.219 |
| 1/2 in | 13 | 0.250 min | 0.270 – 0.291 | 0.250 |
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