| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.248 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.335 INCHES NOMINAL |
| FASTENER LENGTH | 0.745 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 6150 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-8503 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE 2, CLASSS 2 FED SPEC 1ST TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 441 POUNDS PER SQUARE INCH |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| HEAD HEIGHT | 0.250 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.304 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND |
| 0.438 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.126 INCHES NOMINAL |
| SPECIAL FEATURES | HAS FOUR 0.32 TO 0.42 IN. DIAMETER HOLES IN HEX HEAD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, EXTERNAL WRENCHING, ALLOY STEEL, 450 DEGREES FAHRENHEIT, 180-200 KSI |