| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 0.990 INCHES MINIMUM AND |
| 1.010 INCHES MAXIMUM |
| MATERIAL | NICKEL ALLOY 718 OVERALL |
| THREAD LENGTH | 0.4770 INCHES MINIMUM AND |
| 0.4970 INCHES MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.3125 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 3A |
| HEAD HEIGHT | 0.3280 INCHES MINIMUM AND |
| 0.3480 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.3750 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.4900 INCHES MINIMUM AND |
| 0.5100 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.1660 INCHES MINIMUM AND |
| 0.1860 INCHES MAXIMUM |
| CHAMFER ANGLE | 28.0 DEGREES MINIMUM AND |
| 32.0 DEGREES MAXIMUM |
| GRIP LENGTH | 0.513 INCHES MINIMUM |
| GRIP DIAMETER | 0.2470 INCHES MINIMUM AND |
| 0.2550 INCHES MAXIMUM |
| SPECIAL FEATURES | NEXT HIGHER ASSEMBLY IS LIFTFAN ASSEMBLY MODULE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, MACHINE - DOUBLE HEX HEAD, REDUCED SHANK |