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Description
Ronstan Orbit Series 55 Anti-Clockwise Ratchet Cheek BlockProduct Description Ronstan Orbit Series 55 Anti Clockwise Ratchet Cheek Block Features Automatic and Manual ratchet in one block Up to 20: 1 holding power Easily fitted and securely retained Dyneema Link head Smooth easing of sheets High performance cleating Sheave 2 5 32 in. Max. Rope 3 8 in. Max. Wire in. Pin in. Max. Working Load 550 lb B. L. 1540 lb Weight 2. 7 oz Product Information Automatic ratchet block Now you can enjoy the flexibility of
Product Description
Ronstan Orbit Series 55 Anti-Clockwise Ratchet Cheek Block
Features
Automatic and Manual ratchet in one block
Up to 20:1 holding power
Easily fitted and securely retained Dyneema® Link head
Smooth easing of sheets
High performance cleating
Sheave Ø - 2 5/32 in.
Max. Rope Ø - 3/8 in.
Max. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 550 lb
B. L. - 1540 lb
Weight - 2.7 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 competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs 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 minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
Simple and secure attachment
The Dyneema® Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins. The system is compatible with Dyneema®/Spectra® strops, webbing and caron connection points - much more so than steel loop tops or shackles. In auto mode, the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. In manual mode, the sheave cross-hole geometry eliminates the 'shuddering' run-out that you can expect from traditional v-groove ratchet blocks.
Applications
Dinghy mainsheet systems
Spinnaker sheets on dinghies
Control line applications on larger yachts
Materials
Sheave: Hard anodized 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. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 550 lb
B. L. - 1540 lb
Weight - 2.7 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.
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 competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs 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 minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
Simple and secure attachment
The Dyneema® Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins. The system is compatible with Dyneema®/Spectra® strops, webbing and caron connection points - much more so than steel loop tops or shackles. In auto mode, the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. In manual mode, the sheave cross-hole geometry eliminates the 'shuddering' run-out that you can expect from traditional v-groove ratchet blocks.
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:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
A book that you can't put down!
Format: Hardcover
Wonderful and creative book--full of astrophysical and geological info that is understandable. And funny--his sense of humor rocks. This is a book that helps survive the times!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
★★★★★ 4
Another Great Book
Format: Hardcover
I've read all his books, which are very good, but it's getting hard to tell them apart.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Gives a realistic perspective of ETs.
Format: Hardcover
The author is a brilliant man with a wealth of knowledge on the subject.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
★★★★★ 3
When a pop-science author with a sense of humor alienates half his readership because ...
Format: Hardcover
This is a short but interesting and truly fascinating book, and I liked the author's description of what to do with your first alien encounter. IN part because my wife and I are writing a novel on a famous UFO encounter that occurred in rural Kentucky in 1955, and gave us the term "little green men.
" I used to write for UFO Magazine, and have written books on the subject that were NOT novels, but factual (as I see them) real encounters with something Not of This Earth. How this author addressed these incidents is a hoot. Or it was ...
This book remined me of Max Brook's first book on Zombies, yhe one that led up to his World War Z book. HOWEVER, at some point, this otherwise interesting Astro-physicist felt he had to vent his own personal political spleen for or against Trump. I was NOT interested in his views - I imagine if he reads my forthcoming book on UFOs, or the next one in the queue, on how to market and promote your books, he won't be interested in my political beliefs (almost certainly I'm either too far to the Left or too far to the Right for his taste). I thought he was brilliant. Now I see him "alienating" half of his potential reading audience, which isn't at all brilliant. It might even be "dumb as a tree stump."
It's different from some authors/scholars - for instance, military historian Victor Davis Hansen of the Hoover Institute at Stanford University has written a book about his political preference, and does a daily (or more frequent} video blog on the subject, but when he sets out to dissect the Peloponnesian Wars or the current war on Iranian terror, he treats these as an historian, and not as an opinionated political activist.
He may offend or reinforce my historical views, but when it comes to his areas of expertise (his recent World Wars Two book about how WW-II was really five or six different wars going on at the same time) is brilliant, regardless of his political views, which are not material to his remarkable historical scholarship.
The author of Take Me To Your Leader should have taken a page from VDH's book (literally and figuratively). I'm not sure I can actually go back to where I left off and still appreciate what this scientist says about UFOs and aliens (tongue firmly planted in cheek - it's a funny book) without fuming about his political views.
Our nation is so politically divided that I would say to all writers - unless they're writing about politics, don't show your views to your reader - you'll P.O. half of them, at least.
Oh, well, it was fun (and funny) while it lasted.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Delightful and thought-provoking!
Format: Audiobook
Absolutely delightful and thought-provoking Audio book, read by Tyson himself. (An excellent companion volume to Hegseth’s “Take me to Your Liter”. )
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
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