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Description
Ronstan Series 55 Rachet Orbit Block, Triple Becket Cleat SwivelProduct 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 2 5 32 in. Max. Rope 3 8
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
Features
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
Materials
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 4
Yea..its ok.
Works well but hard to Install!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 17, 2026
★★★★★ 5
Worked great 👍
Works great to expand kitchen counter in our RV. Easy installation, looks like it's supposed to be there
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Reviewed in the United States on August 26, 2025
★★★★★ 1
Missing parts unable to use product
Product was missing parts so unable to attach folding counter. Also missing the support brackets. Camco would not replace product because it was purchased from Amazon.
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Reviewed in the United States on March 22, 2024
★★★★★ 5
Easy to install!
Love it! Well made and pretty! Gives much needed extra counter space!
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Reviewed in the United States on June 30, 2025
★★★★★ 5
Great product
Style: 15' Rhino Sewer Hose
Worked like it should, just as described. Very durable & easy to clean & use.
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Reviewed in the United States on May 7, 2026