Inch series · technical reference
Hex Flange Bolt Dimensions
Head and integral-flange geometry for the heavy-series inch hex flange bolt. A separate washer is not represented by the integral flange, and small-series or metric flange bolts require their own standard.
Source: ASME B18.2.1.
CAD ORTHOGRAPHIC REFERENCEASME B18.2.1.8 · 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 | dc — flange Ø | kw — wrenching height max | s — WAF |
|---|---|---|---|---|
| 1/4 in | 20 | 0.563 | 0.17 | 0.375 |
| 5/16 in | 18 | 0.688 | 0.21 | 0.500 |
| 3/8 in | 16 | 0.813 | 0.25 | 0.563 |
| 7/16 in | 14 | 0.938 | 0.30 | 0.625 |
| 1/2 in | 13 | 1.078 | 0.34 | 0.750 |
| 5/8 in | 11 | 1.328 | 0.42 | 0.938 |
| 3/4 in | 10 | 1.594 | 0.51 | 1.125 |
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