| BALL SEAT RADIUS | 0.300 INCHES MINIMUM AND 0.305 INCHES MAXIMUM |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4340 OR STEEL COMP 8740 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.330 INCHES MINIMUM AND 0.340 INCHES MAXIMUM |
| NUT STYLE | SINGLE BALL SEAT, DOUBLE HEXAGON |
| SPECIAL FEATURES | 0.348 IN. MIN AND 0.354 IN. MAX WASHER ID,0.505 IN. MIN AND 0.515 IN. MAX WASHER OD,0.113 IN. MIN AND 0.123 IN. MAX WASHER THICKNESS,0.067 IN. NOM SHOULDER HEIGHT,0.300 IN. MIN AND 0.310 IN. MAX SPHERICAL RADIUS |
| WIDTH ACROSS FLATS | 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 2 FED SPEC 15TH TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD QUANTITY PER INCH | 28 |