| EXTENDED WASHER THICKNESS | 0.060 INCHES MINIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |
| FASTENER LENGTH | 2.115 INCHES MINIMUM AND 2.135 INCHES MAXIMUM |
| FIRST DIAMETER FROM HEAD | 0.246 INCHES MINIMUM AND 0.249 INCHES MAXIMUM |
| HEAD HEIGHT | 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS HR 650 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SECOND DIAMETER FROM HEAD | 0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM |
| SPECIAL FEATURES | HEAD STYLE DOUBLE HEXAGON EXTENDED WASHER NO. 1 W/HOLE ON LONGITUDINAL AXIS OF HEAD; NOT CASEHARDENED |
| WIDTH BETWEEN FLATS | 0.3025 INCHES MINIMUM AND 0.3225 INCHES MAXIMUM |
| STRENGTH GRADE DESIGNATION | ERR-030 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | DTD 939 INTERNATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | SILVER OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.780 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNJF |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.180 INCHES MINIMUM AND 0.210 INCHES MAXIMUM |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 1.315 INCHES MINIMUM AND 1.375 INCHES MAXIMUM |
| CRITICALITY CODE JUSTIFICATION | AATB |