Ball Bearing


Series 75 Ratchet Block

Single Sheave Block with Lockable Swivel Shackle Head and Ratchet


Unrivalled 20:1 holding power.

Dual sided On/Off switch.

Ability to operate On/Off switch under load.

Low friction ball bearing system.


Cheek cut-outs for easy bearing maintenance.


Product Specifications
B.L. (kg)2000
M.W.L. (kg)420
Max. Rope diameter (mm)12
Weight (g)290
Pin Ø (mm)7

The patented extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 20:1 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). Ratchet blocks can be disassembled for sheave replacement with RF72000.

Technical Information


  • Dinghy mainsheet systems - when maximum holding power is required.
  • RF72100 mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit.
  • Control line applications on larger yachts.



  • Sheave & cheek plates: Anodised aluminium.
  • Ball bearings: High compression strength acetal.
  • Ratchet pawl: High strength Torlon®.
  • Swivel shackle head fitting: Grade 316 stainless steel.


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