Hardened Washers according to ASME PCC-1 The washers will be used along with the following nuts Nut size: 1 5/8” 8UN Nut Material: ASTM A194 Gr.7 Hot Dip Galvanized a) Nominal Size, in: 1 5/8IN b) Type 1 Hot Dip Galvanized 3.1 Material Certificate (hardness test (through hardened)) Qty.160 Nos.