Ball bearing blocks for dynamic loads. Acetal discs Axles made of high-strength stainless steel Housing made of composite material Stainless steel balls with acetal spacers to avoid friction between the steel balls Designation Disc Ø mm Working load kg Breaking load kg max. line- Ø mm BBB20, single sheave for binding 20 100 200 6 BBB30, single sheave for binding 30 200 400 8 BBB40, single sheave for binding 40 250 500 10 BBB60, single slice for binding 60 350 1.000 10