| BEARING SURFACE TYPE | CHAMFERED |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL | STEEL COMP 316 OVERALL EXCEPT INSERT |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT HEIGHT | 0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | TENSILE STRENGTH SHALL BE 70 KSI; SURFACE TEXTURE SHALL BE RA 125 MICROINCHES PER ANSI/ASME B46.1 |
| WIDTH ACROSS FLATS | 0.489 INCHES MINIMUM AND 0.502 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC 1ST TREATMENT RESPONSE AND MIL-C-13924 MIL SPEC 2ND TREATMENT RESPONSE OVERALL EXCEPT INSERT |
| SURFACE TREATMENT | PASSIVATE OR OXIDE OVERALL EXCEPT INSERT |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |