| FASTENER LENGTH | 3.660 INCHES MINIMUM AND 3.690 INCHES MAXIMUM |
| GRIP DIAMETER | 0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| GRIP LENGTH | 3.240 INCHES MINIMUM AND 3.260 INCHES MAXIMUM |
| HEAD HEIGHT | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM |
| HEAD STYLE | DISHED HEXAGON |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT TENSION HEX HEAD |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MINIMUM TENSILE STRENGTH | 16000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| WIDTH BETWEEN FLATS | 0.429 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.425 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |