| CENTER HOLE SHAPE STYLE | ROUND |
| CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR |
| HOLE DIAMETER | 4.30 MILLIMETERS MINIMUM AND 4.48 MILLIMETERS MAXIMUM |
| OVERALL DIAMETER | 8.64 MILLIMETERS MINIMUM AND 9.00 MILLIMETERS MAXIMUM |
| MATERIAL | STEEL COMP A2 OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | M4, FLAT WASHER |
| PERIPHERAL SHAPE STYLE | ROUND |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THICKNESS | 0.70 MILLIMETERS MINIMUM AND 0.90 MILLIMETERS MAXIMUM |