| EXTENDED WASHER DIAMETER | 0.645 INCHES MINIMUM AND 0.665 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.035 INCHES MINIMUM AND 0.055 INCHES MAXIMUM |
| FASTENER LENGTH | 0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM |
| HEAD HEIGHT | 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | 280M FSCM 24617 MFR REF 1ST MATERIAL RESPONSE OR 4081M FSCM 24617 MFR REF 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OR COPPER OVERALL |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.047 INCHES MINIMUM AND 0.077 INCHES MAXIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.688 INCHES NOMINAL |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES DESIGNATOR | UNC |