| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| HOLE DIAMETER | 0.195 INCHES MINIMUM AND 0.204 INCHES MAXIMUM |
| OUTSIDE DIAMETER | 0.365 INCHES MINIMUM AND 0.381 INCHES MAXIMUM |
| MATERIAL THICKNESS | 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1050 OR STEEL COMP 1064 OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | WASHER, LOCK, FLAT, INTERNAL TOOTH |
| STYLE DESIGNATOR | FLAT INTERNAL TEETH |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-C-81562, TYPE II, CLASS 6 NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |