| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP E4340 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 8740 NUT |
| STEEL WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE NUT |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM |
| NUT STYLE | FLAT WITH TURNED UP EDGE |
| WASHER OUTSIDE DIAMETER | 0.460 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.280 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.306 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| LOCKING FEATURE | FREE-RUNNING ALL METAL DESIGN |
| NUT COUNTERBORE DEPTH | 0.087 INCHES MINIMUM AND |
| 0.097 INCHES MAXIMUM NUT |
| COUNTERBORE DIAMETER | 0.283 INCHES MINIMUM AND |
| 0.288 INCHES MAXIMUM NUT |
| TEMP RATING | 450.0 DEG FAHRENHEIT MAXIMUM |
| SPECIAL FEATURES | WASHER ROCKWELL C SCALE 40.0 MIN AND 45.0 MAXZ USE WITH K-FAST AUTOMATIC TOOL |