| EXTENDED WASHER DIAMETER | 0.640 INCHES MINIMUM AND 0.654 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.035 INCHES NOMINAL |
| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD HEIGHT | 0.308 INCHES MINIMUM AND 0.324 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,W/LOCK WASHER |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.3750 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.035 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.640 INCHES MINIMUM AND 0.654 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| SPECIAL FEATURES | MATERIAL: BOLT-GRADE 5 STEEL, WASHER-STEEL 1050 |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.5510 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.3287 INCHES MINIMUM AND 0.3331 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 16 |
| THREAD SERIES DESIGNATOR | UNC |