Ogo ọkwa nke usoro TXR (ọkọlọtọ ngwaahịa nke ụdị aka otu nut bọọlụ ịghasa) dabere na C5, Ct7 na Ct10 (JIS B 1192-3). Dabere na ọkwa ziri ezi, egwuregwu Axial 0.005 (bugoro ibu: C5), 0.02 (Ct7) na 0.05mm ma ọ bụ ihe na-erughị (Ct10) nọ na ngwaahịa. Usoro TXR (Standard ngwaahịa nke Sleeve ụdị otu nut ball ịghasa) nke ịghasa shaft ịghasa ihe S55C (induction hardening), nut material SCM415H (carburizing na hardening), n'elu ike nke bọọlụ ịghasa akụkụ bụ HRC58 ma ọ bụ karịa.