| FASTENER LENGTH | 0.610 INCHES MINIMUM AND 0.640 INCHES MAXIMUM |
| HEAD HEIGHT | 0.227 INCHES MINIMUM AND 0.242 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.050 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL AND INTERNAL TEETH |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 2A |
| THREAD LENGTH | 0.555 INCHES MINIMUM AND 0.569 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |