| EXTENDED WASHER DIAMETER | 0.624 INCHES MINIMUM AND 0.676 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM |
| FASTENER LENGTH | 0.625 INCHES NOMINAL |
| HEAD HEIGHT | 0.263 INCHES MINIMUM AND 0.305 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SHOULDER DIAMETER | 0.312 INCHES MINIMUM AND 0.317 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER LENGTH | 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM FIRST SHOULDER |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.340 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 20 |