Precision needle roller bearings: Two types: 1, Metal stamping(TLA, TA, TLA=HK) 2, Steel plat(NA, TAF, TAF=NK) Precision ... needle roller bearings :Two types:1, Metal stamping(TLA, TA, TLA=HK)2, Steel plat(NA, TAF, TAF=NK). ISO ... in the applied technology of rolling bearings.TLA...Z*TLAM,TA...Z*TAM,BA...ZOH*BAM,KT,NA49*RNA49,NA69*RNA69 ...