| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.280 INCHES NOMINAL |
| FASTENER LENGTH | 0.872 INCHES NOMINAL |
| MATERIAL | STEEL COMP 301 SECONDARY WASHER |
| STEEL CORROSION RESISTING PRIMARY WASHER |
| ALUMINUM ALLOY 6061 STAND-OFF |
| STEEL CORROSION RESISTING FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE SECONDARY WASHER |
| 66 FED STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE STAND-OFF |
| ASTM A484 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PASSIVATE SECONDARY WASHER |
| PASSIVATE PRIMARY WASHER |
| ANODIZE STAND-OFF |
| PASSIVATE FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SECONDARY WASHER |
| QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE PRIMARY WASHER |
| MIL-A-8625 TY1 CL1 MIL SPEC SINGLE TREATMENT RESPONSE STAND-OFF |
| QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| HEAD STYLE | PAN NO. 2 |
| HEAD DIAMETER | 0.492 INCHES NOMINAL |
| HEAD HEIGHT | 0.256 INCHES MINIMUM AND |
| 0.281 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| MATERIAL ACCOMMODATED THICKNESS | 0.063 INCHES MINIMUM AND |
| 0.125 INCHES MAXIMUM |
| SPECIAL FEATURES | FLOATING WASHERS |