Dị ka size nke ihe nlereanya na usability nke ụlọ ọrụ na nke m, na sprocket nwere ike mere nke ihe: 35MnSi, 35Mn2,40Mn wdg Mgbe normalizing okpomọkụ ọgwụgwọ nke sprocket oghere, na matrix hardness ruru n'elu HB235, na na Ezé ịnya ụgbọ ala na-eme ka obi sie ike site n'ịdị ike nke ọkara ugboro ugboro induction hardening na iwe ọkụ na obere okpomọkụ.Isi ike dị n'elu ruru HRC48-54, na ịdị omimi dị n'elu 5-10mm (HRC45).Ọ nwere ike ibunye ike n'ụzọ ziri ezi n'okpuru ọnọdụ ọrụ siri ike, ma nwee ọmarịcha ọrụ mgbochi iyi, nke na-eme ka ndụ ngwaahịa dịkwuo mma ma belata ụgwọ ọrụ ndị ahịa.