| COUNTERBORE DIAMETER | 0.347 INCHES MINIMUM AND 0.352 INCHES MAXIMUM NUT |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE NUT |
| MATERIAL | STEEL WASHER |
| MATERIAL | STEEL COMP 8740 OR STEEL COMP E4340 NUT |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT COUNTERBORE DEPTH | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM NUT |
| NUT HEIGHT | 0.340 INCHES NOMINAL |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| OVERALL HEIGHT | 0.340 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD QUANTITY PER INCH | 24 |
| WASHER OUTSIDE DIAMETER | 0.560 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.419 INCHES NOMINAL |