| FASTENER LENGTH | 0.562 INCHES NOMINAL |
| HEAD DIAMETER | 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM |
| HEAD HEIGHT | 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| HEAD STYLE | PAN |
| MINIMUM TENSILE STRENGTH | 120000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.024 INCHES MINIMUM AND 0.030 INCHES MAXIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | SPRING TENSION |
| SPLINE MAJOR DIAMETER | 0.221 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-N-290 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | NICKEL OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.422 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |
| WASHER QUANTITY | 1 |