| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.874 INCHES MINIMUM |
| FASTENER LENGTH | 3.500 INCHES NOMINAL |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A307,GRADE A NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A153 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | ROUND |
| HEAD DIAMETER | 0.688 INCHES MINIMUM AND |
| 0.719 INCHES MAXIMUM |
| HEAD HEIGHT | 0.156 INCHES MINIMUM AND |
| 0.176 INCHES MAXIMUM |
| NECK LENGTH | 2.626 INCHES NOMINAL |
| NECK WIDTH | 0.298 INCHES MINIMUM AND |
| 0.324 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 05047-ASME B18.24-2020 NATIONAL STD/SPEC |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, ROUND, SQUARE NECK (SQUARE NECK CARRIAGE BOLT) |