| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
| WIDTH BETWEEN FLATS | 0.0947 INCHES MINIMUM AND 0.0967 INCHES MAXIMUM |
| FASTENER LENGTH | 0.848 INCHES MINIMUM AND 0.888 INCHES MAXIMUM |
| GRIP LENGTH | 0.439 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| HEAD HEIGHT | 0.061 INCHES MINIMUM AND 0.069 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| HEAD MAJOR DIAMETER | 0.398 INCHES MINIMUM AND 0.413 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 8740 OR STEEL COMP 4340 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| SHANK DIAMETER | 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM |
| SHANK STYLE | PIN-RIVET, STRAIGHT, THREADED |
| SHEAR STRENGTH | 108000 SINGLE POUNDS PER SQUARE INCH |
| SPECIFICATION/STANDARD DATA | 80205-NAS4450 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |