High Tensile Hex Head Screw Size M6X20Mm To Is: 1364/Part 2 & 3/2002, Grade 8.8 / 10.9 For Screw & One Nut Grade 8 With 2 Nos. Ms Plain Washers To Is: 2016 & 1 No. Spring Washer To Is: 3063. Make/Brand Accepted - Rdso Approved Sources For Fasteners Only.