Heavy hex bolts are referenced in many international bolting material standards and specifications across ASTM, ASME, SAE, ISO and BS standards.
| Standards | Size Range |
|---|---|
| ASME B18.2.1 | 3/8 inch to 3 inch |
| BS 1769 | ½ inch to 2 inch |
| ASME B18.2.3.6M | M12 to M36 |
| ASME B18.2.3.7M | M16 to M36 |
| DIN 6914 | M12 to M36 |
| ISO 7412 | M12 to M36 |
| UNI 5712 | M12 to M36 |
| DIN-EN 14399-4 | M12 to M36 |