| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.544 INCHES NOMINAL |
| FASTENER LENGTH | 2.125 INCHES NOMINAL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.330 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.305 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.438 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.168 INCHES NOMINAL |
| GRIP LENGTH | 1.500 INCHES NOMINAL |
| GRIP DIAMETER | 0.2494 INCHES MINIMUM AND |
| 0.2499 INCHES MAXIMUM |
| SURFACE FINISH | 125.0 MICROINCHES OVERALL |
| SPECIAL FEATURES | O'LEVEL ATA-75; FLUORESCENT PENETRANT INSPECTION PER AMS 2645 |
| REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS | ITEM IS FAA CERTIFIED |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, MACHINE-DOUBLE HEXAGON EXTENDED WASHER HEAD, CLOSE TOLERANCE SHANK |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 0U583 |
| DESIGN CONTROL REFERENCE | MS9111-22 |