... ) 2, Steel plat(NA, TAF, TAF=NK) TLA Shell type needle roller bearings :Two types:1, Metal stamping(TLA, TA, TLA=HK ... geometrical accuracy is based on GB/T5801.Mutual difference of needle roller diameter is 2μ M, and the precision grade is ... precision grade, please contact this company.Materials:Material for needle roller is GCr15 bearing steel, quench-hardening HRC60---65.Material for inner and ...