M16 x 30mm OD DIN 125 Grade HV200 Plain Finish Steel Type A General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 17.135 MILLIMETERS NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 3.000 MILLIMETERS NOMINAL OVERALL DIAMETER: 29.740 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: 3810-016079674 MATERIAL: STEEL OVERALL SURFACE TREATMENT: LUBRICANT OVERALL