| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.690 INCHES NOMINAL |
| FASTENER LENGTH | 1.500 INCHES NOMINAL |
| MATERIAL | STEEL COMP 1050 PRIMARY WASHER |
| STEEL FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE 1050 ASSN STD 2ND MATERIAL RESPONSE PRIMARY WASHER |
| GM-Z80-M MFR REF 1ST MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | CADMIUM AND |
| DICHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM4252-M CODE 30D72 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 44.0 ROCKWELL C MINIMUM AND |
| 48.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| HEAD HEIGHT | 0.103 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.244 INCHES MINIMUM AND |
| 0.250 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.322 INCHES MINIMUM AND |
| 0.348 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.045 INCHES NOMINAL |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPRING TENSION |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.370 INCHES MINIMUM AND |
| 0.380 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.025 INCHES NOMINAL |