THREAD LENGTH | 1.120 INCHES MINIMUM |
FASTENER LENGTH | 3.250 INCHES NOMINAL |
MATERIAL | STEEL OVERALL |
SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
HEAD HEIGHT | 0.625 INCHES NOMINAL |
WIDTH BETWEEN FLATS | 0.679 INCHES MINIMUM AND |
| 0.690 INCHES MAXIMUM |
EXTENDED WASHER DIAMETER | 1.040 INCHES MINIMUM AND |
| 1.050 INCHES MAXIMUM |
EXTENDED WASHER THICKNESS | 0.151 INCHES NOMINAL |
SHOULDER SHAPE | ROUND FIRST SHOULDER |
SHOULDER DIAMETER | 0.6230 INCHES MINIMUM AND |
| 0.6240 INCHES MAXIMUM FIRST SHOULDER |
SHOULDER LENGTH | 1.416 INCHES NOMINAL FIRST SHOULDER |
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 2.540 INCHES NOMINAL FIRST HOLE |
SHANK UNTHREADED HOLE DIAMETER | 0.109 INCHES NOMINAL FIRST HOLE |
PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
THREAD SERIES DESIGNATOR | UNF |
NOMINAL THREAD DIAMETER | 0.438 INCHES |
THREAD QUANTITY PER INCH | 20 |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |