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Description
Ronstan Orbit Series 55 Single Swivel Head Block w/ CleatProduct Description Ronstan Orbit Series 55 Single Swivel Head Block w Cleat Features Automatic and Manual ratchet in one block Up to 20: 1 holding power Smooth easing of sheets High performance cleating Sheave 2 5 32" + 1 3 8" (55 + 35 mm) Max. Rope 3 8" (10 mm) Max. Cable in. (mm) Pin in. (mm) M. W. L. 1100 lb. (500 kg) B. L. 2200 lb. (1000 kg) Weight 7. 2 oz (204 g) Product Information Automatic ratchet block Now you can enjoy the flexibility of
Product Description
Ronstan Orbit Series 55 Single Swivel Head Block w/ Cleat
Features
Automatic and Manual ratchet in one block
Up to 20:1 holding power
Smooth easing of sheets
High performance cleating
Sheave Ø - 2 5/32" + 1 3/8" (55 + 35 mm)
Max. Rope Ø - 3/8" (10 mm)
Max. Cable Ø - in. (mm)
Pin Ø - in. (mm)
M.W.L. - 1100 lb. (500 kg)
B. L. - 2200 lb. (1000 kg)
Weight - 7.2 oz (204 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.
Materials
Sheave: Hard anodized Aluminum
Ball Bearings: High compression strength carbon black Acetal
Frame/Cheeks: Toughened, glass fibre reinforced Nylon
Rope Link: UV stabilised, multi-strand impregnated SK75 Dyneema®
Features
Sheave Ø - 2 5/32" + 1 3/8" (55 + 35 mm)
Max. Rope Ø - 3/8" (10 mm)
Max. Cable Ø - in. (mm)
Pin Ø - in. (mm)
M.W.L. - 1100 lb. (500 kg)
B. L. - 2200 lb. (1000 kg)
Weight - 7.2 oz (204 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.
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.
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
4.7 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Like that it can be charged while it's stored
Color: 7-in-1 Silver, Size: Rechargeable Set
I like that this wine bottle opener can be charged on the stand, making it always ready to perform. No worry about batteries or needing a charge before the dinner/party. It's handy to have the foil cutter and aerator beside the bottle opener and the stoppers which use the end of the bottle opener to remove air from partial bottles for temporary storage were a plus!
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Efficient product
Color: 7-in-1 Silver, Size: Rechargeable Set
Excellent product, looks, and removal of corks.
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Reviewed in the United States on February 6, 2026
★★★★★ 5
Great product
Color: 7-in-1 Silver, Size: Rechargeable Set
Totally effortless for an amateur. Useful accessories
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Join the Wine Life!
Color: 7-in-1 Silver, Size: Rechargeable Set
We love this wine opener! So easy, so smooth. Like magic!
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Reviewed in the United States on November 23, 2025
★★★★★ 5
Easy to use!
Color: Green
This has made my life easier. I like the battery last for long. And is easy to use!
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Reviewed in the United States on May 23, 2026