| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 1.5520 INCHES MINIMUM AND |
| 1.5720 INCHES MAXIMUM |
| MATERIAL | NICKEL ALLOY 718 OVERALL |
| THREAD LENGTH | 0.8710 INCHES MINIMUM AND |
| 0.8910 INCHES MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| HEAD HEIGHT | 0.2930 INCHES MINIMUM AND |
| 0.3130 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.3125 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.4280 INCHES MINIMUM AND |
| 0.4480 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.1580 INCHES MINIMUM |
| CHAMFER ANGLE | 28.0 DEGREES MINIMUM AND |
| 32.0 DEGREES MAXIMUM |
| GRIP LENGTH | 0.6810 INCHES MINIMUM |
| GRIP DIAMETER | 0.2220 INCHES MINIMUM AND |
| 0.2320 INCHES MAXIMUM |
| SPECIAL FEATURES | NEXT HIGHER ASSEMBLY IS LIFTFAN ASSEMBLY MODULE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, MACHINE, DOUBLE HEXAGON HEAD, P.D. SHANK, 185 KSI |