Ronstan RF55521 Series 55 Ball Bearing Orbit Block - Fiddle & Cleat Link Head

Highest working load in its class

Kilogram for kilogram of working load, the Ronstan RF55521 Series 55 Ball Bearing Orbit Block - Fiddle & Cleat Link Head is among Ronstan's BB and RT Orbit Blocks that are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub. Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.

Ronstan RF55521 Series 55 Ball Bearing Orbit Block - Fiddle & Cleat Link Head Features:

• Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement.
  
• The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance.
  
• The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range
  
• The floating sheave and bearing system is supported by a fibre-reinforced load frame. The design was computer modelled to be stress optimised
  
• The Dyneema Link is produced from FSE Robline SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point
  
• The race-proven carbon-fibre reinforced Ronstan C-Cleat give secure rope holding with low entry and exit efforts, and are fitted with fairleads for fast action from any angle
  
• Applications:
  
  • Mainsheet systems on dinghies, sportsboats and small keelboats to 9m (30ft)
    
  • Spinnaker sheets on dinghies, sportsboats and small keel boats to 9m (30ft)
    
  • Halyard, Vang and Backstay application on boats to 8m (26ft)
    
  • Control line applications on larger yachts
    

Ronstan RF55521 Series 55 Ball Bearing Orbit Block - Fiddle & Cleat Link Head Specifications:

• Sheave diameter: 55 + 35 mm
  
• Max. Rope diameter: 10 mm
  
• M.W.L.: 500 kg
  
• B. L.: 1000 kg
  
• Weight: 231 g
  
• Materials:
  
  • Ball Bearings - High compression stregnth carbon black Acetal
    
  • Stage 2 bearing - Carbon fibre reinforced, PTFE impregnated Nylon
    
  • Frame/Cheeks - Toughened, glass fibre reinforced Nylon
    
  • Rope/Link - UV stabilised, multi-strand impregnated SK75 Dyneema