| FASTENER LENGTH | 3.156 INCHES MINIMUM AND 3.250 INCHES MAXIMUM |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.361 INCHES MINIMUM AND 0.389 INCHES MAXIMUM |
| HEAD STYLE | SQUARE |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1022 OR STEEL COMP 1212 OR STEEL COMP 1213 OR STEEL COMP 1137 OVERALL |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 3 STYLE |
| POINT STYLE | OVAL |
| WIDTH BETWEEN FLATS | 0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 3.250 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 13 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |