Ronstan Series 15 BB Single, Swivel Shackle Head Block

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  • Smallest and lightest ball bearing block available.
  • Precision moulded acetal sheave running on stainless steel ball bearings provide high performance & low friction.
  • Single loop head blocks include an O-ring to separate running line from head lashing or fixing.


  • Sheave Ø 15 mm
  • Max. Rope 5 mm
  • Max. Cable Ø mm
  • Pin Ø mm
  • M.W.L. 120 kg
  • B. L. 400 kg
  • Weight 11 g


  • Dinghy control lines
  • Vangs, cunninghams and tweakers
  • Shock cord tensioning systems 


  • BB sheaves: UV stabilised acetal
  • Ball bearings: Stainless steel
  • Cheeks: Grade 316 stainless steel


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