28B B Series Roller Chain 1.material:40MN/A3 2.pitch:44.450mm 3.plate thickness:7.5/6.0mm 4.surface treatment:heat ... ,530,630 (Racing Chains)7. Leaf chains: LH series8. Double pitch conveyor chains with attachments: 2040,2050,2060,20809. Nickel-plated ... chains: 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below:1.Shot peening2.Bluing3.Phosphating4 ...