20,000 mm x 42,000 mm x 12,000 mm NTN 6004LB deep groove ball bearings

We Provide Extensive 20,000 mm x 42,000 mm x 12,000 mm NTN 6004LB deep groove ball bearings Selection 20,000 mm x 42,000 mm x 12,000 mm And LYC BEARING CORP.OF German LTD. Competitive Wholesale Pricing. 789 kN Basic dynamic load rating C

What is 6004LB bearing cross reference？