Flat & Spring Washers Share Facebook Twitter LinkedIn Google+ Email October 9, 2015 by Irwin 5. Washers 5.1 DIN 126 / ISO 7091 Black cut plain flat washers 5.2 DIN 7980 / ISO 8738 Square medium spring washers single coil 5.3 DIN 6916 / ISO 7416 Through hardened washers Other forms available on request