COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
FASTENER LENGTH | 0.375 INCHES NOMINAL |
HARDNESS RATING | 36.0 ROCKWELL C MINIMUM OVERALL AND 43.0 ROCKWELL C MAXIMUM OVERALL |
HEAD DIAMETER | 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM |
HEAD STYLE | FLAT COUNTERSUNK |
NOMINAL THREAD DIAMETER | 0.164 INCHES |
NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 11 STYLE |
INTERNAL DRIVE STYLE | HEXAGON |
MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL |
MATERIAL | STEEL COMP 4135 OVERALL OR STEEL COMP 4137 OVERALL OR STEEL COMP 8640 OVERALL |
MINIMUM YIELD STRENGTH | 140000 POUNDS PER SQUARE INCH |
THREAD LENGTH | 0.375 INCHES NOMINAL |
THREAD QUANTITY PER INCH | 32 |
THREAD SERIES DESIGNATOR | UNC |
WIDTH ACROSS FLATS | 0.093 INCHES MINIMUM AND 0.094 INCHES MAXIMUM |
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-Z-325,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
SURFACE TREATMENT | ZINC OVERALL AND CHROMATE OVERALL |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |