... 3.making as your sample 4.OEM is ok Short Pitch Roller Chain 1.material:40MN/A32.standard roller ... O-ring chains and xw-chains: 420,428,520,525,530,630 (Racing Chains)7. Leaf chains: LH series8. Double pitch conveyor chains with attachments: 2040 ... ,2050,2060,20809. Nickel-plated chains: 25NP,35NP, ...