NNU3196 Double-row NNU Series cylindrical roller bearing 1:OEM 2.Durable quality 3:GCr15SiMn,GCr15,G20CrNi4A 4.ISO 9001 Guanyu bearing products are all produced to home and abroad use,professional export packing,according to customer specific needs of the deliberations. We make all the bearings according to the quality of ISO9001:2000. Our strict testing and inspection system guarantee the high ...