DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.750 INCHES NOMINAL FIRST HOLE |
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.312 INCHES NOMINAL |
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 3.125 INCHES NOMINAL |
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 2 |
FASTENER LENGTH | 3.875 INCHES NOMINAL |
FIRST DIAMETER FROM HEAD | 0.243 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
HARDNESS RATING | 28.0 ROCKWELL B MAXIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
HEAD HEIGHT | 0.188 INCHES NOMINAL |
HEAD STYLE | HEXAGON |
MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
MATERIAL | STEEL COMP 8640 OVERALL |
NOMINAL THREAD DIAMETER | 0.250 INCHES |
SECOND DIAMETER FROM HEAD | 0.194 INCHES MINIMUM AND 0.199 INCHES MAXIMUM |
SHANK UNTHREADED HOLE DIAMETER | 0.078 INCHES NOMINAL FIRST HOLE |
WIDTH BETWEEN FLATS | 0.438 INCHES NOMINAL |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 0.750 INCHES MINIMUM |
THREAD QUANTITY PER INCH | 28 |
THREAD SERIES DESIGNATOR | UNF |