2022 Ronstan Marine Catalogue - VIEW CATALOGUE

PHOTO CREDIT:© Gordon Upton / guppypix.com

*DISCONTINUED* Ratchet Blocks

Series 100mm


  •  Unrivalled 25:1 holding power
  •  Dual sided On-Off switch
  •  Low friction ball bearing system
  •  Lightweight
  •  Cheek cut-outs for easy bearing maintenance

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  Product No. Desc. Sheave ŲMax. Rope ŲMax. Cable ŲPin ŲM.W.L.B. L.Weight  

The patented extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 14:1 holding power. Unrivalled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired) Unique On-Off switch mechanism can be operated under load. Ratchet blocks can be disassembled for servicing or customisation. Exceptional holding power, enabling spinnaker sheet trimmer to gybe without using winches in controlled conditions.

Range Selection Advice
  • Spinnaker sheets on boats up to 11m (33ft)
  • Carbon black Acetal ball bearings
  • Alloy sheave and cheek plates
  • Torlon® ratchet pawl
  • Grade 316 stainless steel forged shackle