| FASTENER LENGTH | 3.250 INCHES NOMINAL |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.615 INCHES MINIMUM AND 0.625 INCHES MAXIMUM |
| HEAD HEIGHT | 0.430 INCHES MINIMUM AND 0.437 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| HOLE CONFIGURATION STYLE | ROUND |
| HOLE DIAMETER | 0.070 INCHES NOMINAL |
| HOLE QUANTITY | 2 |
| HOLE TYPE | DRILLED |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 8640 OVERALL |
| MINIMUM YIELD STRENGTH | 140000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.438 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 11 STYLE |
| WIDTH ACROSS FLATS | 0.312 INCHES MINIMUM AND 0.315 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-Z-325,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | ZINC AND CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.625 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 14 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |