| FASTENER LENGTH | 3.468 INCHES MINIMUM AND 3.532 INCHES MAXIMUM |
| FEATURES PROVIDED | CASEHARDENED |
| HEAD DIAMETER | 1.234 INCHES MINIMUM AND 1.266 INCHES MAXIMUM |
| HEAD HEIGHT | 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM |
| HEAD STYLE | ROUND W/WRENCH FLATS |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4615 OVERALL |
| NOMINAL THREAD DIAMETER | 0.625 INCHES |
| SHOULDER DIAMETER | 0.811 INCHES MINIMUM AND 0.812 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER LENGTH | 1.444 INCHES MINIMUM AND 1.448 INCHES MAXIMUM FIRST SHOULDER |
| SPECIAL FEATURES | CIRCUMFERENTIAL GROOVE 0.140 IN. WIDE,1.946 FROM BEARING SURFACE OF HEAD CARBURIZED TO ROCKWELL C SCALE 50 TO 60 HARDNESS |
| WIDTH BETWEEN FLATS | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-16232 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-16232 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE MANGANESE OR PHOSPHATE ZINC OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.823 INCHES MINIMUM AND 0.849 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES DESIGNATOR | UNF |