... C12B-1 roller chain with straight side plate: 1, Material: 40Mn 2, Color: Natural 3, The kind of chain has many models C12B-1 roller ... chain with straight side plate' specification:1, Plate material: 40Mn; Pin: 40Cr; Bush ... : 1.70mm; Roller Diameter: 10.16mm3, Color: Natural. blue, yellow and black are available.4, It is made by advanced heat treatment with ...