... , TLA=HK) 2, Steel plat(NA, TAF, TAF=NK) Precision needle roller bearings :Two types:1, Metal stamping(TLA, TA, TLA=HK)2 ... bearing running clearance, inscribed circle and precision grade, please contact this company.Materials:Material for needle roller is GCr15 bearing steel, quench ... ...R,NAST...Z...ZZUU-NART...R...VR,NART...UUR...VUUR Precision Needle Roller Bearings