... ) 2, Steel plat(NA, TAF, TAF=NK) Medium and Large Sized Needle Roller Bearings :Two types:1, Metal stamping(TLA, TA, TLA ... based on GB/T5801.Mutual difference of needle roller diameter is 2μ M, and the precision grade is G2 (ISO GB309 ... grade F6 before the fitting of outer ring with cage and roller assembly.Bearing radial running clearance conforms to the value defined ...