European Standard EN ISO has the status of a DIN Standard. DIN EN ISO Plain washers for metric bolts, screws and nuts for general. Old norm, DIN , Product grade A washers, designed for use with hexagon head bolts and nuts. Current norm: DIN EN ISO , Plain washers - Normal. DIN A. ~ISO HV. Standard withdrawn. BN Flat washers without chamfer. Steel HV black-oxidized. • VSM • ~UNI Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible. type, primarily for hexagon bolts. This standard has been withdrawn and replaced by the following: DIN EN ISO , DIN EN ISO , ISO , ISO 1,1. 3. 0,2. –. 2. 2,2. 5. 0,3. 2,5. 2,7. 6. 0,5. 3. 3,2. 7. 0,5. WZ – A HV Hardened Zinc. DIN A. ISO / DIN Flat Washer - product drawing - d1=ID, d2=OD, s. DIN Technical Specifications. ISO - Plain washers Form A. Equivalent norms: DIN A; CSN ; PN ; UNI ; Table according to DIN dimensions in mm. M, d, D, h, Unit of sale, Ref. Quote request. M1,6, 1,7, 4,0, 0,3, 1 , ,6A, Add to quote. M1,7, 1,8, 4,5, 0,3, 1 , ,7A, Add to quote. M2, 2,2, 5,0, 0,3.