| THREAD SERIES DESIGNATOR | UNRC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 2.490 INCHES MINIMUM AND |
| 2.800 INCHES MAXIMUM |
| FASTENER LENGTH | 2.700 INCHES MINIMUM AND |
| 2.800 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1050 PRIMARY WASHER |
| STEEL FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| GM275-M,FSCM 11862 MFR REF SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | CHROMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM 4251-M CODE 20,FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND |
| 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| 30.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM FASTENER |
| HEAD STYLE | DISHED HEXAGON |
| HEAD HEIGHT | 0.208 INCHES MINIMUM AND |
| 0.230 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND |
| 0.500 INCHES MAXIMUM |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 1.000 INCHES MINIMUM AND |
| 1.020 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.035 INCHES MINIMUM AND |
| 0.045 INCHES MAXIMUM |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 11862 |
| DESIGN CONTROL REFERENCE | 358549 |