| FASTENER LENGTH | 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM |
| HEAD HEIGHT | 0.208 INCHES MINIMUM AND 0.230 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.078 INCHES MINIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.540 INCHES MINIMUM AND 0.556 INCHES MAXIMUM |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.483 INCHES MINIMUM AND 0.594 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 18 |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |