bearing material:

440C Stainless Steel
52100 Bearing Steel
52100 Steel
52100 steel/Black Oxide
AISI 52100 Steel
AISI 52100 Steel - Zinc Protection
Babbitt
Case Carburized Steel
Cast Bronze C93200 (SAE 660)
Cast Iron
Chrome Steel
High Carbon Chrome Steel
Powdered Metal
Powdered Metal SAE 841 Bronze
SAE 52100 Steel
Steel
Through Hardened Steel