Roller Chain 1.Standards:ISO/DIN/ANSI 2.Good quality with ... chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105. ... chains: 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below:1.Shot peening2.Bluing3.Phosphating4 ... plated5.Zincing6.Heat treatment7.Carburizing8.Quenching9.Tempering10.Oiling11.Greasing Chain Link