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Ronstan Single Block Swivel Ball Bearing

  code:RF56100
£60.00 (Delivery from £5.75)
Item in Stock  |  Usually dispatched within 24 hours
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Features

  • Up to 20:1 holding power
  • Smooth easing of sheets
  • High performance cleating
  • Swivel shackle head for unlimited block rotation.
  • Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points.
  • Automatic & manual ratchet block

 

Sheave Ø 55 mm
Max. Rope Ø 10 mm
Max. Cable Ø mm
Pin Ø mm
M.W.L. 250 kg
B. L. 650 kg
Weight 82 g

Product Information

 

Automatic ratchet block

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.

 

* Selected Series 55 models.

 

 

 

Awesome ratchet block holding power

 

Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load. 

 

 

 


Applications

 

  • Mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel
  • boats to 8m(26ft).
  • Halyard, vang and backstay applications on boats to 8m (26ft).
  • Spinnaker sheets on sportsboats and small keel boats (lateral lead blocks)

 


Materials

 

  • Sheave: Hard anodised Aluminium
  • Ball Bearings: High compression strength carbon black Aceetal
  • Frame/Cheeks: Toughened, glass fibre reinforced Nylon
  • Rope Link: UV stabilised, multi-strand impregnated SK75 Dyneema®
  • Head fitting: grade 316 stainless steel.
  • Ball Bearings: High compression strength carbon black Acetal.
  • Sheave : Hard anodised aluminium.

Please contact us for more information on Payment & Security.

Standard delivery for UK mainland takes 3 -5 working days from date of despatch. For out of stock items please allow a maximum of 21 days delivery. Small, low value items weighing less than 1kilogram will be sent by Royal Mail throughout the UK at a cost of £5.29 (£4.41 + VAT).  Larger, high value items will be sent by carrier for UK mainland (excluding Highlands and islands), at a standard delivery charge for UK mainland of £9.60 (£8 + VAT) per order for goods up to 10kg and up to 1.5m length.

For overseas orders heavy and bulky items, pyrotechnics and other hazardous goods an additional charge will apply.

All orders paid for by credit card must be delivered to the address of the card holder.