... standard part, fastener, fabricated mechanical part, bronze lock, rivet, steel pin and pin.2. Hot fitting refers to the connection ... crankshaft, connecting rod, piston pin, chain wheel, aluminum wheel, valve, rock arm shaft, semi drive shaft, small shaft and ... fitting, precision mold fitting, hardware handle, eggbeater, alloy steel and steel, steel and copper as well as copper and copper.3. Compound ...