Item #880004

Ronstan Series 40 Block - RF41520

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Ronstan Series 40 Block - RF41520

Item # 880004


The Ronstan Series 40 Fiddle Block with Becket and Adjustable Cam Cleat (RF41520) is a great all-purpose block.The self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position.


  • Exceptionally high working loads
  • Low maintenance, long service life
  • Self-lubricating sheave
  • Captive Lock™ universal head
  • Slotted pin shackle eliminates fouled lines
  • Multi-position cleat arm
  • Applications:
    • Mainsheet
    • Halyard
    • Vang
    • Spinnaker control lines on off-the-beach catamarans, one design classes and sports boats up to 8m (26ft)
    • Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems


  • Safe working load: 880 lb (400 kg)
  • Breaking load: 2200 lb (1000 kg)
  • Weight: 5.5 oz (157g)
  • Sheave diameter: 1-9/16" and 15/16" (40 mm and 24 mm)
  • Maximum line size: 5/16" (8 mm)
  • Materials:
    • U.V. stabilized Acetal sheaves
    • Grade 316 stainless steel bearing race
    • Grade 316 stainless steel load strap and head fitting
    • Impact and UV resistant, fiber reinforced Nylon cheeks

Part Numbers for Ronstan Series 40 Block - RF41520

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