| FASTENER LENGTH | 0.8850 INCHES MINIMUM AND 0.9050 INCHES MAXIMUM |
| GRIP LENGTH | 0.4950 INCHES MINIMUM AND 0.5050 INCHES MAXIMUM |
| HEAD HEIGHT | 0.0590 INCHES MINIMUM AND 0.0690 INCHES MAXIMUM |
| HEAD MAJOR DIAMETER | 0.3870 INCHES MINIMUM AND 0.4120 INCHES MAXIMUM |
| LUBRICATION | CETYL ALCOHOL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| NOMINAL THREAD SIZE | 0.2500 INCHES |
| SHANK DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM |
| SHANK STYLE | PIN-RIVET, STRAIGHT, THREADED |
| WIDTH BETWEEN FLATS | 0.0947 INCHES MINIMUM AND 0.0967 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |