| EXTENDED WASHER DIAMETER | 0.438 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM |
| FASTENER LENGTH | 0.812 INCHES MINIMUM |
| HEAD HEIGHT | 0.187 INCHES NOMINAL |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 321 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.062 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.400 INCHES MINIMUM AND 0.430 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.562 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.305 INCHES MINIMUM AND 0.312 INCHES MAXIMUM |