| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| THREAD QUANTITY PER INCH | 40 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.281 INCHES MINIMUM |
| FASTENER LENGTH | 1.656 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SINGLE SHEAR STRENGTH | 1060 POUNDS PER SQUARE INCH |
| HEAD STYLE | BUTTON |
| HEAD DIAMETER | 0.312 INCHES NOMINAL |
| HEAD HEIGHT | 0.078 INCHES NOMINAL |
| INTERNAL DRIVE STYLE | SLOT |
| GROOVE DIAMETER | 0.095 INCHES MINIMUM AND |
| 0.105 INCHES MAXIMUM |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.531 INCHES NOMINAL FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.038 INCHES MINIMUM AND |
| 0.048 INCHES MAXIMUM FIRST HOLE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 88044 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | AN21-26 |
| MANUFACTURERS CODE | 81349 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | B6812 |