| DEPARTURE FROM CITED DESIGNATOR | AS MODIFIED BY THREAD CLASS |
| FASTENER LENGTH | 2.500 INCHES NOMINAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM OVERALL AND 53.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.544 INCHES MINIMUM AND 0.582 INCHES MAXIMUM |
| HEAD STYLE | SQUARE |
| NOMINAL THREAD DIAMETER | 0.750 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 1SSJST4 TYPE |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 4037 OVERALL OR STEEL COMP 4137 OVERALL OR STEEL COMP 4140 OVERALL OR STEEL COMP 8630 OVERALL OR STEEL COMP 8740 OVERALL |
| POINT STYLE | CUP |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 2.500 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 10 |
| THREAD SERIES DESIGNATOR | UNC |
| WIDTH BETWEEN FLATS | 0.729 INCHES MINIMUM AND 0.750 INCHES MAXIMUM |