... .making as your sample 4.OEM is ok agricultural chain attachments 1.material:40MN/A32.standard roller chain3.making as ... ,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105. PIV chains: A0 ... -plated chains: 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below: 1.Shot peening2.Bluing3.Phosphating4 ...