| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.208 INCHES MINIMUM AND 0.230 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| MATERIAL | STEEL OVERALL |
| PRIMARY WASHER MATERIAL THICKNESS | 0.078 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.540 INCHES MINIMUM AND 0.556 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.639 INCHES MINIMUM AND 0.750 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES DESIGNATOR | UNC |