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Description
Ronstan Orbit Series 40 Auto Clockwise Rotation CheekProduct Description Ronstan Orbit Series 40 Auto Clockwise Rotation Cheek Features Auto and Manual models to suit every application or preference Up to 14: 1 holding power highest available! Easily fitted and securely retained Dyneema link head Smooth easing of sheets Clockwise rotation Fully automatic, load sensing ratchet engagement Recessed underside to suit curved mounting surface Low mounting points for maximum strength Sheave 1 9 16 in. Max.
Product Description
Ronstan Orbit Series 40 Auto Clockwise Rotation Cheek
Features
Auto and Manual models to suit every application or preference
Up to 14:1 holding power - highest available!
Easily fitted and securely retained Dyneema® link head
Smooth easing of sheets
Clockwise rotation
Fully automatic, load sensing ratchet engagement
Recessed underside to suit curved mounting surface
Low mounting points for maximum strength
Sheave Ø - 1 9/16 in.
Max. Rope Ø - 5/16 in.
Max. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 385 lb
B. L. - 1102 lb
Weight - 1.3 oz
Product Information
Automatic and manual ratchet options
Now you can enjoy the flexibility of setting up your fitout exactly to suit yourself. Ronstan is the only company that offers a 40mm ratchet block with both auto and manual engagement models*
With automatic models, 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.
Manual modes allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for may top sailors.
Selected Series 40 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. The Series 40 delivers up to 14:1 holding ower, almost double that of our nearest competitor.
The unique sheave design has 8 gripping faces which directly resist loaded line movement. Traditional designs have 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 carbon connection points - much more so than steel loop tops or shackles.
Smooth easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross - hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Low profile stand-up kit allows 0° or 90° alignment
Stand-up kits feature a clatter-free rubber boot. You can attach the Dyneema® link so that the block is aligned with the stand-up base or across it. It's a neat low-profile solution which allows full articulation.
Smooth Easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Applications
Dinghy mainsheet systems
Mainsheet fine tune systems on sportsboats & small keel boats
Mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit
Spinnaker and job sheets on dinghies - especially modern asymmetric classes
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 - 1 9/16 in.
Max. Rope Ø - 5/16 in.
Max. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 385 lb
B. L. - 1102 lb
Weight - 1.3 oz
Product Information
Automatic and manual ratchet options
Now you can enjoy the flexibility of setting up your fitout exactly to suit yourself. Ronstan is the only company that offers a 40mm ratchet block with both auto and manual engagement models*
With automatic models, 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.
Manual modes allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for may top sailors.
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. The Series 40 delivers up to 14:1 holding ower, almost double that of our nearest competitor.
The unique sheave design has 8 gripping faces which directly resist loaded line movement. Traditional designs have 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 carbon connection points - much more so than steel loop tops or shackles.
Smooth easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross - hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Low profile stand-up kit allows 0° or 90° alignment
Stand-up kits feature a clatter-free rubber boot. You can attach the Dyneema® link so that the block is aligned with the stand-up base or across it. It's a neat low-profile solution which allows full articulation.
Smooth Easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-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:
- 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
4.0 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Love the color
Color: Brown, Size: 6 Panel
It work really well. It could be a little more heavier
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
★★★★★ 3
O.K Divider
Color: Natural, Size: 8 Panel
This has room divider is good, but if you are looking for total privacy - this is not it. You can see thought the home in the panels.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 4, 2026
★★★★★ 5
Privacy
Color: Dark Coffee, Size: 4 Panel
This delivers great coverage!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 5
good product
Size: 6FT*6FT, Color: Bright Yellow, Size: 6FT*6FT, Color: Bright Yellow
work beans
sturdy and versitle
easy install
people said it bad because they are dorf hellen Kellers
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
★★★★★ 1
Not worth it!
Size: 6FT*6FT, Color: Black
These are the terrible. They keep falling down. The bottom part doesn't stay tight so it keeps turning making it in possible to stay standing. Its the absolute worst!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
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