| THREAD SERIES | UNC |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 1022 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A545 ASSN STD 1ST MATERIAL RESPONSE OR |
| ASTM A108 ASSN STD 2ND MATERIAL RESPONSE OR |
| ASTM A576 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633 TYPE II,CLASS FE/ZN 12 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND |
| 36.0 ROCKWELL C MAXIMUM |
| NUT STYLE | CLINCH |
| PILOT DIAMETER | 0.336 INCHES MINIMUM AND |
| 0.341 INCHES MAXIMUM |
| PILOT LENGTH | 0.090 INCHES NOMINAL |
| NUT DIAMETER | 0.550 INCHES MINIMUM AND |
| 0.560 INCHES MAXIMUM |
| NUT HEIGHT | 0.268 INCHES NOMINAL |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |