| FASTENER LENGTH | 0.540 INCHES MINIMUM AND 0.560 INCHES MAXIMUM |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.530 INCHES MINIMUM AND 0.550 INCHES MAXIMUM |
| HEAD HEIGHT | 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| NECK LENGTH | 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM |
| NECK WIDTH | 0.276 INCHES MINIMUM AND 0.278 INCHES MAXIMUM |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.410 INCHES MINIMUM AND 0.450 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |