THREAD SERIES DESIGNATOR | UNC |
NOMINAL THREAD DIAMETER | 0.437 INCHES |
THREAD QUANTITY PER INCH | 14 |
THREAD CLASS | 2A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 1.125 INCHES MINIMUM |
FASTENER LENGTH | 2.812 INCHES NOMINAL |
MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
HARDNESS RATING | 90.7 ROCKWELL B MAXIMUM OVERALL |
MINIMUM YIELD STRENGTH | 051000 POUNDS PER SQUARE INCH |
HEAD STYLE | HEXAGON |
HEAD HEIGHT | 0.312 INCHES NOMINAL |
WIDTH BETWEEN FLATS | 0.674 INCHES MINIMUM AND |
| 0.688 INCHES MAXIMUM |
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 2 |
FIRST DIAMETER FROM HEAD | 0.432 INCHES MINIMUM AND |
| 0.437 INCHES MAXIMUM |
SECOND DIAMETER FROM HEAD | 0.390 INCHES MINIMUM AND |
| 0.394 INCHES MAXIMUM |
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.250 INCHES NOMINAL |
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 1.688 INCHES NOMINAL |
SPEC/STD CONTROLLING DATA | |
MANUFACTURERS CODE | 81348 |
NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-S-85 |