... =HK) 2, Steel plat(NA, TAF, TAF=NK) Medium and Large Sized Needle Roller Bearings :Two types:1, Metal stamping(TLA, TA ... based on GB/T5801.Mutual difference of needle roller diameter is 2μ M, and the precision grade is G2 (ISO GB309 ... bearing running clearance, inscribed circle and precision grade, please contact this company.Materials:Material for needle roller is GCr15 bearing steel, quench ...