These blocks are optimised for wires or Dyneema/Spectra core. Ball bearing blocks are used where the loads are more moderate and dynamic. The ball bearings provide for good sheave rotation with the lowest possible friction. Available in 20, 30, 40 and 60 mm sheave diameters.
Stainless steel, electro polished cheeks, anodised aluminium sheave and polymer plain bearing bushing.
Outer side plates to increase breaking load — but still optimising the weight. For PBB 60/80/100/130.
Two polyamide washers on pin/ bushing to reduce play between wire terminal and cheeks.