roller chain,roller chain,roller chain,roller chain,roller chain,roller chain,roller chain,roller chain,roller chain ANSI 80 /DIN 16A-1 standard roller chain 1.material:40MN ... sample or drawing9.sound quality,reasonable price and prompt delivery are what we persue10.Packing:1pc packing in PP ... : 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below:1.Shot peening2.Bluing3. ...