DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 4.054 INCHES MINIMUM AND 4.074 INCHES MAXIMUM FIRST HOLE |
FASTENER LENGTH | 4.170 INCHES MINIMUM AND 4.190 INCHES MAXIMUM |
HARDNESS RATING | 38.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
HEAD HEIGHT | 0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM |
HEAD STYLE | HEXAGON |
MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
MATERIAL | STEEL COMP E4340 OVERALL |
MINIMUM TENSILE STRENGTH | 165000 POUNDS PER SQUARE INCH |
NOMINAL THREAD DIAMETER | 0.250 INCHES |
SHANK UNTHREADED HOLE DIAMETER | 0.074 INCHES MINIMUM AND 0.079 INCHES MAXIMUM FIRST HOLE |
SHOULDER DIAMETER | 0.373 INCHES MINIMUM AND 0.374 INCHES MAXIMUM FIRST SHOULDER |
SHOULDER LENGTH | 3.734 INCHES MINIMUM AND 3.744 INCHES MAXIMUM FIRST SHOULDER |
SHOULDER SHAPE | ROUND FIRST SHOULDER |
WIDTH BETWEEN FLATS | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM |
SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 0.306 INCHES MINIMUM AND 0.326 INCHES MAXIMUM |
THREAD QUANTITY PER INCH | 28 |
THREAD SERIES DESIGNATOR | UNF |