N'iji 40Cr ma ? b? 42CrMo d? ka ihe ndabere, nkenke emebere oghere na-eme ka ? d? mma, nt?ghar?, ihe eji eme ihe, carbonitriding, mkpuchi ?k? na iwe ?k?, ?mar?cha gburugburu nke ime, yana usoro ?gw?gw? mgbochi nchara b? HRC58- HRC62, ezigbo ?r?, yana nyocha siri ike nke ngwaah?a emechara.

A d?gas? iche iche nke kacha nha nha nha agh?gh? d? maka ?r? ?h?r? site: herringbone eze ?d?, mman? a?? gburugburu oghere ?d?, oghere ogologo nha nha nchikota ?d?, nnukwu spiral helical eze ?d?, nk?t? ogologo nha nha ?d?, na site nha nha ?d?.

Nhazi igwe na-egweri ihe d? elu nke ?ma na-eme ka o doo anya na gburugburu ime nke igwe nr?gide na-adaba n'?z? ziri ezi nke onye ?r?, yana ihe nd? ch?r? coaxial nke n'ime na n'èzí nke nr?gide nr?gide.