M12 Nylon Flat Washer DIN 125-1A Plain washers without chamfer to DIN 125-1 A with a minimum hardness of 140HV. Because of the low compression strength these plain washers are exclusively appropriate in combination with bolts with property class 8.8 c.q. with nuts with property class 8 Plastic / Polyamide (Nylon) / PA 6.6 Measurements in mm (millimeters) d2 = 24 s = 2.5 d1 = 13