| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.210 INCHES NOMINAL |
| FASTENER LENGTH | 0.375 INCHES NOMINAL |
| MATERIAL | STEEL COMP 302 SECONDARY WASHER |
| STEEL CORROSION RESISTING PRIMARY WASHER |
| STEEL COMP 303 SPRING |
| STEEL COMP 303 OR |
| STEEL COMP 303 PLUS X OR |
| STEEL COMP 303MA OR |
| STEEL COMP 303PB OR |
| STEEL COMP 303SE STAND-OFF |
| STEEL CORROSION RESISTING FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A555 ASSN STD SINGLE MATERIAL RESPONSE OR |
| ASTM A581 ASSN STD SINGLE MATERIAL RESPONSE SECONDARY WASHER |
| MIL-S-5059, 300 SERIES MIL SPEC ALL MATERIAL RESPONSES PRIMARY WASHER |
| ASTM A313 ASSN STD ALL MATERIAL RESPONSES OR |
| QQ-W-423 FED SPEC ALL MATERIAL RESPONSES SPRING |
| AMS 5640 ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A484 ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A582 ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A555 ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A581 ASSN STD ALL MATERIAL RESPONSES STAND-OFF |
| ASTM A276, 300 SERIES ASSN STD ALL MATERIAL RESPONSES OR |
| AMS 5640, 300 SERIES ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A484, 300 SERIES ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A582, 300 SERIES ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A555, 300 SERIES ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A581, 300 SERIES ASSN STD ALL MATERIAL RESPONSES FASTENER |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.302 INCHES MINIMUM AND |
| 0.322 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.146 INCHES MINIMUM AND |
| 0.166 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.144 INCHES MINIMUM AND |
| 0.166 INCHES MAXIMUM |