NEW! 2020 Ronstan Sailboat Hardware Catalogue - VIEW CATALOGUE

PHOTO CREDIT:© Gordon Upton /

Roller Ball Bearing Blocks

Series 100mm


  •  High static and dynamic load capacity
  •  Torlon® needle rollers
  •  Minimal friction across the working load range
  •  Reliable, trouble-free performance
  •  Simplicity of design and construction facilitate maintenance and servicing

  • Share:
  Product No. Desc. Sheave ŲMax. Rope ŲMax. Cable ŲPin ŲM.W.L.B. L.Weight Price    

The self-contained alloy sheave packages provide reliable, low-friction performance at high loads. The high axial loads are carried by Torlon® roller needle bearings, while side thrust loads are taken up by Acetal ball bearings. Block sheave and cheeks are manufactured from the highest quality alloy for maximum strength. The cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Blocks can be disassembled for servicing or customisation.

Range Selection Advice
  • Mainsheet, halyard and spinnaker sheets on boats to 16m (53ft)
  • Backstay applications on boats to 12m (40ft)
  • Alloy sheave and cheek plates
  • Torlon® needle rollers
  • Carbon black Acetal ball bearings