| THREAD SERIES DESIGNATOR | UNRC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.578 INCHES MINIMUM AND |
| 0.682 INCHES MAXIMUM |
| FASTENER LENGTH | 0.720 INCHES MINIMUM AND |
| 0.750 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| SAE ASSN STD ALL MATERIAL RESPONSES FASTENER |
| SURFACE TREATMENT | ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM4342-M,CODE 20U32,FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 44.0 ROCKWELL C MINIMUM AND |
| 48.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | PAN |
| HEAD DIAMETER | 0.594 INCHES MINIMUM AND |
| 0.615 INCHES MAXIMUM |
| HEAD HEIGHT | 0.203 INCHES MINIMUM AND |
| 0.218 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPRING TENSION |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.620 INCHES MINIMUM AND |
| 0.640 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.052 INCHES MINIMUM AND |
| 0.060 INCHES MAXIMUM |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 7X677 |
| DESIGN CONTROL REFERENCE | 9431663 |