JG/T 5057.31-1995
Construction machinery and equipment High strength plain washers-Normal series
JG/T 5057.32-1995
Construction machinery and equipment High strength plain washers-Smatl series
JG/T 5057.33-1995
Construction machinery and equipment High strength plain washers-Large series
JG/T 5057.34-1995
Construction machinery and equipment High strength square taper washers for 工 section
JG/T 5057.35-1995
Construction machinery and equipment High strength square taper washers for slot section