... , NATV, PP seriesNUTR, NUTR, X seriesIR, IR seriesNKIA, NKIB series1)Drawn cup needle roller bearing: HK, BK, HK RS, HK 2RS, BK RS ... -RS SERIES, FFH SERIES, MFH SERIES, FY SERIES, MFY SERIES, HF SERIES, HFL SERIES etc2. Materials: GCr15, GCr15SiMn, G20Cr2Ni4A etcRing and ... according to the samples..BK, HK, BA, BCE,SCE, F, HF, K, KZK, KBK, NK, RNA, NKI, NA, RNAV, NAV, AXK ...