| HOLE DIAMETER | 13.00 MILLIMETERS MINIMUM AND 13.27 MILLIMETERS MAXIMUM |
| OUTSIDE DIAMETER | 0.96 MILLIMETERS MINIMUM AND 1.04 MILLIMETERS MAXIMUM |
| OVERALL HEIGHT | 19.98 MILLIMETERS MINIMUM AND 20.50 MILLIMETERS MAXIMUM |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | WASHER, LOCKING IN M12X20X1 |
| STYLE DESIGNATOR | INTERNAL TEETH |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |