| THREAD SERIES DESIGNATOR | UNRC |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| THREAD QUANTITY PER INCH | 16 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.060 INCHES MINIMUM |
| FASTENER LENGTH | 1.375 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| GM 275-M FSCM 11862 MFR REF SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | PHOSPHATE PRIMARY WASHER |
| PHOSPHATE FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM 4435-M CODE A TYPE 72 FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE PRIMARY WASHER |
| GM 4435-M CODE A TYPE 72 FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE FASTENER |
| HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND |
| 48.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| MINIMUM TENSILE STRENGTH | 130000 POUNDS PER SQUARE INCH |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.270 INCHES MINIMUM AND |
| 0.295 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.551 INCHES MINIMUM AND |
| 0.562 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 1.115 INCHES MINIMUM AND |
| 1.135 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.112 INCHES MINIMUM AND |
| 0.122 INCHES MAXIMUM |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 7X677 |
| DESIGN CONTROL REFERENCE | 15641800 |