... 420,428,520,428H, 525, 530 etcMaterial1045 steel, 1023 steel and 16MnSurface-finishingSandblasting, Dull polish, Galvanized, with the circle line ... requirement.Heat treatment:High frenquency quenching and CarburizationPackaging:Blister card, Slide blister, Poly bag, sprockets and chain set box or according to ... OEM Service Offered Design Service Offered Buyer Label Offered roller chain and sprocket