| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.433 INCHES NOMINAL |
| FASTENER LENGTH | 2.375 INCHES MINIMUM AND |
| 2.395 INCHES MAXIMUM |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 7477 ASSN STD SINGLE MATERIAL RESPONSE AND |
| PWA-S-7477,CAGE77445 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.293 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.3125 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND |
| 0.448 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.065 INCHES NOMINAL |
| EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 |
| FIRST DIAMETER FROM HEAD | 0.308 INCHES MINIMUM AND |
| 0.310 INCHES MAXIMUM |
| SECOND DIAMETER FROM HEAD | 0.194 INCHES MINIMUM AND |
| 0.198 INCHES MAXIMUM |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 1.885 INCHES MINIMUM AND |
| 1.895 INCHES MAXIMUM |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 1.952 INCHES NOMINAL |
| SPECIAL FEATURES | CENTER HEAD HOLE 0.140/0.160 IN. DIA X 0.135 IN. NOM DEEP |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 77445 |
| DESIGN CONTROL REFERENCE | 4060146 |