| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 304 OR |
| STEEL COMP 305 OR |
| IRON ALLOY 660 OVERALL |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| BEARING SURFACE TYPE | CHAMFERED |
| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3B |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5639 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5697 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5685 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5686 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE II, CLASS 2 OR 8 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT HEIGHT | 0.340 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.305 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| NUT COUNTERBORE DEPTH | 0.107 INCHES MINIMUM AND |
| 0.117 INCHES MAXIMUM OVERALL |
| COUNTERBORE DIAMETER | 0.284 INCHES MINIMUM AND |
| 0.288 INCHES MAXIMUM OVERALL |