| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.339 INCHES MAXIMUM |
| FASTENER LENGTH | 3.324 INCHES MINIMUM AND |
| 3.329 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | GM1010 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CHROMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-C-320 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND |
| 49.0 ROCKWELL C MAXIMUM OVERALL |
| STYLE DESIGNATOR | CONCENTRIC HOLE UNTHREADED |
| SHOULDER DIAMETER | 0.4965 INCHES MINIMUM AND |
| 0.4985 INCHES MAXIMUM |
| SHOULDER LENGTH | 2.985 INCHES MINIMUM AND |
| 2.990 INCHES MAXIMUM |
| CONCENTRIC HOLE DEPTH | 2.860 INCHES NOMINAL |
| CONCENTRIC HOLE DIAMETER | 0.339 INCHES MINIMUM AND |
| 0.349 INCHES MAXIMUM |
| HEAD STYLE | ROUND W/WRENCH FLATS CHAMFERED |
| HEAD DIAMETER | 0.875 INCHES NOMINAL |
| HEAD HEIGHT | 0.125 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.688 INCHES NOMINAL |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.184 INCHES MINIMUM AND |
| 3.189 INCHES MAXIMUM FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.075 INCHES MINIMUM AND |
| 0.080 INCHES MAXIMUM FIRST HOLE |