| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.250 INCHES NOMINAL |
| FASTENER LENGTH | 0.862 INCHES MINIMUM AND |
| 0.902 INCHES MAXIMUM |
| MATERIAL | IRON ALLOY 660 FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE SECONDARY WASHER |
| 66 FED STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| QQ-W-423 COND B FED SPEC SINGLE MATERIAL RESPONSE SPRING |
| QQ-A-225/8 FED SPEC SINGLE MATERIAL RESPONSE STAND-OFF |
| AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PASSIVATE SECONDARY WASHER |
| PASSIVATE PRIMARY WASHER |
| PASSIVATE SPRING |
| 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 |
| QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SPRING |
| MIL-A-8625 TY 1 CL 1 MIL SPEC SINGLE TREATMENT RESPONSE STAND-OFF |
| QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HEAD STYLE | PAN |
| HEAD DIAMETER | 0.306 INCHES MINIMUM AND |
| 0.322 INCHES MAXIMUM |
| HEAD HEIGHT | 0.105 INCHES MINIMUM AND |
| 0.115 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MATERIAL ACCOMMODATED THICKNESS | 0.031 INCHES MINIMUM AND |
| 0.088 INCHES MAXIMUM |