| CHAMFER ANGLE | 30.0 DEGREES MINIMUM AND 30.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM45.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 1.918 INCHES MINIMUM AND 1.918 INCHES MINIMUM AND 1.938 INCHES MAXIMUM1.938 INCHES MAXIMUM |
| HEAD DIAMETER | 0.419 INCHES MINIMUM AND 0.419 INCHES MINIMUM AND 0.438 INCHES MAXIMUM0.438 INCHES MAXIMUM |
| HEAD HEIGHT | 0.183 INCHES NOMINAL0.183 INCHES NOMINAL |
| HEAD STYLE | FLAT CHAMFERFLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGONHEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | NASM 21472 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALLNASM 21472 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALLSTEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES0.250 INCHES |
| SHOULDER DIAMETER | 0.3085 INCHES MINIMUM AND 0.3085 INCHES MINIMUM AND 0.3105 INCHES MAXIMUM ALL SHOULDERS0.3105 INCHES MAXIMUM ALL SHOULDERS |
| SHOULDER SHAPE | ROUND ALL SHOULDERSROUND ALL SHOULDERS |
| SHOULDER LENGTH | 1.500 INCHES NOMINAL ALL SHOULDERS1.500 INCHES NOMINAL ALL SHOULDERS |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 2020 |
| WIDTH ACROSS FLATS | 0.156 INCHES NOMINAL0.156 INCHES NOMINAL |
| SPECIFICATION/STANDARD DATA | 80205-NAS-51975 NATIONAL STD/SPEC80205-NAS-51975 NATIONAL STD/SPEC |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B 633, TYPE II, CLASS FE/ZN 5 ASSN STD SINGLE TREATMENT RESPONSE OVERALLASTM B 633, TYPE II, CLASS FE/ZN 5 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALLZINC OVERALL |
| THREAD CLASS | 3A3A |
| THREAD DIRECTION | RIGHT-HANDRIGHT-HAND |
| THREAD LENGTH | 0.418 INCHES MINIMUM AND 0.418 INCHES MINIMUM AND 0.438 INCHES MAXIMUM0.438 INCHES MAXIMUM |