NEW! 2020 Ronstan Sailboat Hardware Catalogue - VIEW CATALOGUE


Series 75mm



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

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These blocks have the strength and durability to meet the requirements of racing and cruising. Block 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.The Torlon® Roller and Ball Bearing 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 bearin
Sheave Ų3 in.
Max. Rope Ų9/16 in.
Max. Cable Ų- in
Pin Ų- in.
M.W.L.4390* lb.
B. L.8770* lb.
Weight18.9 oz.
* Total block load. Maximum load on top sheave not to exceed 50% of total block load.
  • Mainsheet on boats to 14m (46ft)
  • Halyard and spinnaker sheets on boats to 15m (50ft)
  • Backstay applications on boats to 11m (36ft)
  • General control line applications on larger yachts
  • Alloy cheek plates
  • Alloy sheave
  • Torlon® needle rollers
  • Carbon black Acetal ball bearings