Product Description

Ronstan Series 55 Ratchet Orbit Block, Triple underhung becket, adjustable cleat, auto, swivel
Features

Automatic and manual ratchet in one block

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

Ultra low profile integrated beckets
Sheave Ø - 2 5/32 in.
Max. Rope Ø - 3/8 in.
Max. Cable Ø - in
Pin Ø - - in.
M.W.L. - 1650 lb.
B. L. - 3310 lb.
Weight - 13.8 oz.
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, catamarans, sport boats and small keel boats to 9 m (30 ft)

RF55410 when paired with RF56330B and a RF65101 lashed to the becket produces a powerful 8:1 mainsheet system for use on catamarans to 5.5m (18 ft). This can be increased to 9:1 by replacing RF35010 with a RF35202

Halyard, vang and backstay applications on boats a 8m (26 ft)

Control line applications on larger yachts
Materials

sheave: Hard anodised Aluminum

Ball Bearings: high compression strength carbon black Acetal

Frame/Cheeks: Toughened, glass fiber reinforced Nylon

Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema