... type needle roller bearings: Two types: 1, Metal stamping(TLA, TA, TLA=HK) 2, Steel plat(NA, TAF, TAF=NK) TLA Caged type ... needle roller bearings :Two types:1, Metal stamping(TLA, TA, ... please contact this company.Materials:Material for needle roller is GCr15 bearing steel, quench-hardening HRC60---65 ... VR,NART...UUR...VUUR TLA Caged Type Needle Roller Bearings