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SF-1B Bronze backing Pb-free oil free dry bearing,Website:http://www.oillessbearing1.com, is the substitute of and parallels in performance with abroadDP4-B.Sf-1B bronze base bearing is based on tin bronze, intermediate sintered bronze ball powder, surface rolling PTEEÂ Â and high temperature filling material.It has a high safety factor, especially where continuous work cannot be stopped and where high temperatures cannot be refueled. Currently widely used in metallurgy, steel industry, continu