| THREAD CLASS | 2B |
| NUT STYLE | HEXAGON |
| NUT HEIGHT | 0.403 INCHES MINIMUM AND 0.441 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.728 INCHES MINIMUM AND 0.750 INCHES MAXIMUM |
| TEMP RATING | 1000.0 FAHRENHEIT NOMINAL |
| HARDNESS RATING | 24.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| NOMINAL THREAD SIZE | 0.438 INCHES |
| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-1222,TYPE 2,GRADE 4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |