Ronstan Series 75 BB Single Core Block - Universal Head

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Product Description

Ronstan Series 75 Ball Bearing Single Core Block - Universal Head (RF74100)


  • Class leading performance and sleek, contemporary styling
  • Excellent dynamic and high static load performance
  • Less than half the friction of the nearest competitor
  • Universal head with full 3-axis articulation
  • Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex Key
  • Alloy Rope / Wire sheave version also available, special order only
  • Central hub hole can be used as a becket take-off or tie-up point, Max 13.5mm line


  • Ideal for use on mainsheet, spinnaker sheet, vang, halyard and backstay applications on boats up to 14m (46ft)
  • General applications on larger yachts
  • Alloy sheave models are available for use with wire


  • Sheave: U.V. stabilised acetal or anodised aluminium (AW models)
  • Cheek plates: Aluminium alloy
  • Ball Bearings: High compression strength carbon black acetal
  • Shackle, post & hub: Grade 316 stainless steel


  • Sheave Ø: 75 mm
  • Max. Rope Ø: 14 mm
  • Max. Cable Ø: NA
  • Pin Ø: 8 mm
  • MWL: 1500 kg
  • BL: 3000 kg
  • Weight: 354 g

SKU: #