| CENTER HOLE SHAPE STYLE | ROUND |
| CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR |
| HARDNESS RATING | 33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| HOLE DIAMETER | 0.531 INCHES NOMINAL |
| PERIPHERAL SHAPE STYLE | ROUND |
| MATERIAL | STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL |
| OVERALL DIAMETER | 0.875 INCHES NOMINAL |
| SPECIAL FEATURES | NSN ASSIGNED IN SUPPORT OF ARMY CLEAN HARDWARE ABATEMENT INITIATIVE |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-32687/1 GOVERNMENT SPECIFICATION |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-PRF-32647, ZINC-NICKEL PLATING, TYPE K20 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | |
| THICKNESS | 0.060 INCHES NOMINAL |