| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL OVERALL |
| NUT STYLE | HEXAGON |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| BEARING SURFACE TYPE | CHAMFERED OR |
| WASHER FACED |
| THREAD SERIES | UNF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 2B |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 FED SPEC 1ST TREATMENT RESPONSE OR |
| QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 32.0 ROCKWELL C NOMINAL |
| NUT HEIGHT | 0.328 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.4280 INCHES MINIMUM AND |
| 0.4385 INCHES MAXIMUM |
| LUBRICATION | DRY FILM LUBRICANT |
| TEMP RATING | 250.0 DEG FAHRENHEIT NOMINAL |
| SPECIAL FEATURES | HEAD MARKINGS INDENTED AT 120.0 DEGREES |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND |
| B GRADE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MILN45913 |