| COUNTERBORE DIAMETER | 0.347 INCHES MINIMUM THREADS AND 0.352 INCHES MAXIMUM THREADS |
| HARDNESS RATING | 24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | IRON ALLOY 660 OVERALL |
| PILOT DIAMETER | 0.386 INCHES MINIMUM AND 0.390 INCHES MAXIMUM |
| PILOT LENGTH | 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT COUNTERBORE DEPTH | 0.120 INCHES MINIMUM THREADS AND 0.160 INCHES MAXIMUM THREADS |
| NUT LENGTH | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM |
| NUT HEIGHT | 0.560 INCHES MINIMUM AND 0.600 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.421 INCHES MINIMUM AND 0.431 INCHES MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNJF |