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COVID UPDATE - Ronstan & Bell Marine are now closed due to Stage 4 lockdowns in Victoria. This is impacting our stock levels of part numbers (SKUs) starting with "RON-" & "VIP-". Orders for these products will be shipped after September 13th. All other products remain unaffected, although some slight shipment delays continue to occur due to reduced warehouse staffing.

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Ronstan Ratchet Orbit Blocks, Series 55 - Single, Swivel Head, Auto & Manual

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  • Ronstan Ratchet Orbit Blocks, Series 55 - Single, Swivel Head, Auto & Manual
Ronstan
RRP: $108.99
$103.54 (You save $5.45)

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SKU:
RON-RF56100

 Product Description

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 and compatibility with sharp fixing points.
  • Automatic & manual ratchet block

Application:

  • 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: Anodised Aluminium
  • Ball Bearings: High compression strength carbon black Acetal
  • 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

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. 

Part Number Sheave Ø Max. Rope Ø Max. Cable Ø Pin Ø M.W.L. B. L. Weight
RON-RF56100 55mm 10mm - 5mm 250kg 650kg 82g

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