| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL |
| FASTENER LENGTH | 1.2025 INCHES MINIMUM AND 1.2225 INCHES MAXIMUM |
| GRIP LENGTH | 0.6875 INCHES MINIMUM AND 0.6975 INCHES MAXIMUM |
| HEAD STYLE | FLUSH COUNTERSUNK |
| HEAD MAJOR DIAMETER | 0.421 INCHES MINIMUM AND 0.426 INCHES MAXIMUM |
| LUBRICATION | CETYL ALCOHOL, SPEC 305, HI-SHEAR CORP AND DRY FILM |
| MATERIAL DOCUMENT AND CLASSIFICATION | SPS-M-573,CAGEC 56878 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | COBALT COMP MP-35-N OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| SHANK DIAMETER | 0.2852 INCHES MINIMUM AND 0.2857 INCHES MAXIMUM |
| SHANK STYLE | PIN-RIVET, STRAIGHT, THREADED |
| WIDTH BETWEEN FLATS | 0.0946 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) |