| CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG LENGTH | 0.998 INCHES MINIMUM AND 1.002 INCHES MAXIMUM |
| COUNTERBORE DIAMETER | 0.297 INCHES MINIMUM AND 0.302 INCHES MAXIMUM NUT |
| DISTANCE FROM APERTURE CENTER TO MOUNTING HOLE CENTER | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM |
| HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| MATERIAL | STEEL OR STEEL COMP 4130 OVERALL |
| MOUNTING HOLE ARRANGEMENT STYLE | 2 HOLES |
| MOUNTING HOLE DIAMETER | 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT COUNTERBORE DEPTH | 0.062 INCHES MINIMUM NUT |
| NUT HEIGHT | 0.295 INCHES MAXIMUM |
| NUT MOUNTING PROVISION | STRAIGHT HOLES |
| NUT STYLE | PLATE |
| NUT LENGTH | 1.295 INCHES MAXIMUM |
| PLATE THICKNESS | 0.047 INCHES MAXIMUM |
| PLATE WIDTH | 0.545 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNJF |