This Standard was made to provide a guidelines to be used in the design of machine face plates matching the location of nuts, washers, studs of abrasive discs, or plain or tapped holes of plate mounted wheels. It covers practice for location and size of bolt holes for mounting 5 in. to 84 in. diameter abrasive discs and plate mounted wheels. The disc types covered within this Standard are abrasive, insert nut, insert washer, tapped mounting plate, projected stud, cylinder, plate mounted.