| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.3125 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.572 INCHES NOMINAL |
| FASTENER LENGTH | 3.822 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS6382 NATIONAL STD ALL MATERIAL RESPONSES OR |
| AMS6415 NATIONAL STD ALL MATERIAL RESPONSES OR |
| AMS6484 NATIONAL STD ALL MATERIAL RESPONSES OR |
| AMS6322 NATIONAL STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS672 NATIONAL STD ALL TREATMENT RESPONSES OVERALL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.348 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.368 INCHES MINIMUM AND |
| 0.377 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.526 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.082 INCHES NOMINAL |
| GRIP LENGTH | 3.250 INCHES NOMINAL |
| GRIP DIAMETER | 0.3110 INCHES MINIMUM AND |
| 0.3120 INCHES MAXIMUM |
| SPECIAL FEATURES | HARDNESS: 39-43 HRC. |