| COUNTERBORE DIAMETER | 0.541 INCHES MINIMUM NUT AND 0.551 INCHES MAXIMUM NUT |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | SOLUBLE LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE NUT OR AMS6300 ASSN STD 2ND MATERIAL RESPONSE NUT OR MIL-S-5000 MIL SPEC 3RD MATERIAL RESPONSE NUT OR MIL-S-5000 MIL SPEC 4TH MATERIAL RESPONSE NUT OR ASTM A322 ASSN STD 5TH MATERIAL RESPONSE NUT |
| MATERIAL | STEEL COMP 1050 WASHER |
| MATERIAL | STEEL COMP 8740 NUT OR STEEL COMP 4037 NUT OR STEEL COMP E4340 NUT OR STEEL COMP 4340 NUT OR STEEL COMP 4027 NUT |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD SIZE | 0.500 INCHES |
| NUT COUNTERBORE DEPTH | 0.072 INCHES MINIMUM NUT AND 0.087 INCHES MAXIMUM NUT |
| NUT STYLE | FLAT WITH TURNED UP EDGE |
| OVERALL HEIGHT | 0.430 INCHES NOMINAL |
| WASHER OUTSIDE DIAMETER | 0.805 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.560 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNJF |