| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.3125 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.250 INCHES MINIMUM AND |
| 0.260 INCHES MAXIMUM |
| FASTENER LENGTH | 2.920 INCHES MINIMUM AND |
| 2.932 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4340 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE AMS6409 ASSN STD SINGLE MATERIAL RESPONSE OR |
| SAE AMS6414 ASSN STD SINGLE MATERIAL RESPONSE OR |
| SAE AMS6415 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-DTL-16282, TYPE M OR Z, CLASS I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND |
| 41.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | HEXAGON EXTENDED WASHER |
| HEAD HEIGHT | 0.370 INCHES MINIMUM AND |
| 0.392 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.490 INCHES MINIMUM AND |
| 0.500 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.613 INCHES MINIMUM AND |
| 0.623 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.140 INCHES MINIMUM AND |
| 0.162 INCHES MAXIMUM |
| SHOULDER SHAPE | ROUND OVERALL |
| SHOULDER DIAMETER | 0.431 INCHES MINIMUM AND |
| 0.433 INCHES MAXIMUM FIRST SHOULDER |
| 0.431 INCHES MINIMUM AND |
| 0.433 INCHES MAXIMUM SECOND SHOULDER |
| SHOULDER LENGTH | 2.200 INCHES MINIMUM AND |
| 2.205 INCHES MAXIMUM SECOND SHOULDER |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | TRAY LATCH SHAFT |