TLA Shell type needle roller bearings: Two types: 1, Metal stamping(TLA, ... , TLA=HK) 2, Steel plat(NA, TAF, TAF=NK) TLA Shell type needle roller bearings :Two types:1, Metal stamping(TLA ... radial running clearance conforms to the value defined by 0 group of GB/T4604.Special precision grade is based on GB ... ,NAST...Z...ZZUU-NART...R...VR,NART...UUR...VUUR TLA Shell Type Needle Roller Bearings