| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.450 INCHES MINIMUM AND |
| 0.490 INCHES MAXIMUM |
| FASTENER LENGTH | 0.815 INCHES MINIMUM AND |
| 0.885 INCHES MAXIMUM |
| MATERIAL | STEEL CORROSION RESISTING SLEEVE |
| STEEL CORROSION RESISTING SPRING |
| STEEL CORROSION RESISTING FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM-A-582 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5640 ASSN STD SINGLE MATERIAL RESPONSE SLEEVE |
| ASTM-A-313 ASSN STD SINGLE MATERIAL RESPONSE SPRING |
| AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5737 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.300 INCHES MINIMUM AND |
| 0.340 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.552 INCHES MINIMUM AND |
| 0.572 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.178 INCHES MINIMUM AND |
| 0.198 INCHES MAXIMUM |