| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.402 INCHES MINIMUM AND |
| 0.442 INCHES MAXIMUM |
| FASTENER LENGTH | 1.724 INCHES MINIMUM AND |
| 1.744 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 431 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-18732 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | BUTTON |
| HEAD DIAMETER | 0.865 INCHES MINIMUM AND |
| 0.885 INCHES MAXIMUM |
| HEAD HEIGHT | 0.240 INCHES MINIMUM AND |
| 0.260 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| GROOVE DIAMETER | 0.422 INCHES NOMINAL |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 88044 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | AN28-27A |