Item #880006

Ronstan Series 40 Fiddle Block - RF40530

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Ronstan Series 40 Fiddle Block - RF40530

Item # 880006


The Ronstan Series 40 Fiddle Block with Becket and Adjustable Cleat (RF40530) is made from precision moulded Acetal sheaves running on Acetal or Torlon® ball bearings to provide high performance and low friction.. The 2-stage ball bearing system provides consistent performance over the full load range.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. Becket pin is removeable.


  • Low friction, 2-stage ball bearing system
  • High static and dynamic load capacity
  • Lightweight
  • Cheek cut-outs for easy bearing maintenance
  • Captive Lock™ universal head
  • Slotted pin shackle eliminates fouled lines
  • Snap fit removable becket pin
  • Multi-position cleat arm


  • Mainsheet
  • Halyard
  • Vang
  • Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
  • Typically used in direct 4:1 purchase systems such as mainsheets and boom vangs
  • On larger boats they are used for fine-tune mainsheet tackles, outhauls, cunninghams, checkstays, genoa lead pullers and traveller controls.


  • Safe working load: 770 lb (349 kg)
  • Breaking load: 2200 lb (1000 kg)
  • Weight: 5.7 oz (162 g)
  • Sheave diameter: 1-9/16" & 15/16" (40 mm & 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 Fiddle Block - RF40530

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