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Ronstan Series 40 AP Fiddle Universal Head Block with Adjustable Cleat

Cat.No:  6437 Sup. No:  RF41520

Availability: In stock

RRP: $85.44

our price $78.95
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All purpose (AP) blocks are a great all around solution. 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


  • Mainsheet
  • Halyard
  • Vang
  • Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
  • Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.


  • Sheave Diam: 40 + 24 mm
  • Max. Rope Diam: 8 mm
  • Max. Wire Diam: Not Suitable
  • Pin Diam: 5.0mm
  • Max. Working Load: 400 kg
  • Breaking Load:1000 kg
  • Weight: 157 g


  • U.V. stabilised Acetal sheaves
  • Impact and U.V. resistant, fibre reinforced Nylon cheeks
  • Grade 316 stainless steel bearing race
  • Grade 316 stainless steel load strap and head fitting
  • Impact and UV resistant, fibre reinforced Nylon cheeks

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