THREAD SERIES DESIGNATOR | UNC |
NOMINAL THREAD DIAMETER | 0.375 INCHES |
THREAD QUANTITY PER INCH | 16 |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 1.250 INCHES MINIMUM AND |
| 1.297 INCHES MAXIMUM |
FASTENER LENGTH | 1.484 INCHES MINIMUM AND |
| 1.531 INCHES MAXIMUM |
MATERIAL | STEEL OVERALL |
MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
SURFACE TREATMENT | ZINC OVERALL |
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-Z-325,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM OVERALL |
MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
MINIMUM YIELD STRENGTH | 130000 POUNDS PER SQUARE INCH |
HEAD STYLE | FLAT COUNTERSUNK |
HEAD DIAMETER | 0.720 INCHES MINIMUM AND |
| 0.781 INCHES MAXIMUM |
COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND |
| 84.0 DEGREES MAXIMUM |
INTERNAL DRIVE STYLE | HEXAGON |
WIDTH ACROSS FLATS | 0.219 INCHES NOMINAL |
LOCKING FEATURE | PELLET THREADS |
NONDEFINITIVE SPEC/STD DATA | 4 TYPE |
DEPARTURE FROM CITED DESIGNATOR | AS MODIFIED BY LOCKING FEATURE |
SPEC/STD CONTROLLING DATA | |
MANUFACTURERS CODE | 81348 |
NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFS86 |