| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.180 INCHES NOMINAL |
| FASTENER LENGTH | 2.500 INCHES NOMINAL |
| MATERIAL | STEEL COMP 8637 OR |
| STEEL COMP 8640 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | PHOSPHATE ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | JDT826,FSCM75160 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| HEAD HEIGHT | 0.390 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.611 INCHES MINIMUM AND |
| 0.627 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.714 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.120 INCHES MINIMUM AND |
| 0.140 INCHES MAXIMUM |
| EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 |
| FIRST DIAMETER FROM HEAD | 0.413 INCHES MINIMUM AND |
| 0.423 INCHES MAXIMUM |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 1.320 INCHES NOMINAL |