| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.370 INCHES NOMINAL |
| FASTENER LENGTH | 0.995 INCHES NOMINAL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5853 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | ALUMINUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS4006 NATIONAL STD SINGLE TREATMENT RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.125 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.429 INCHES MINIMUM AND |
| 0.439 INCHES MAXIMUM |
| GRIP LENGTH | 0.312 INCHES NOMINAL |
| GRIP DIAMETER | 0.2641 INCHES MINIMUM AND |
| 0.2651 INCHES MAXIMUM |