| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 1.250 INCHES |
| THREAD QUANTITY PER INCH | 12 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.646 INCHES NOMINAL |
| FASTENER LENGTH | 4.193 INCHES MINIMUM AND |
| 4.223 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 202000 POUNDS PER SQUARE INCH |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.625 INCHES MINIMUM AND |
| 0.640 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 1.801 INCHES MINIMUM AND |
| 1.815 INCHES MAXIMUM |
| CHAMFER ANGLE | 15.0 DEGREES NOMINAL |
| GRIP LENGTH | 2.552 INCHES MINIMUM AND |
| 2.572 INCHES MAXIMUM |
| GRIP DIAMETER | 1.2475 INCHES MINIMUM AND |
| 1.2490 INCHES MAXIMUM |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| 32.0 MICROINCHES THREADS |