SKU: 50908257109

Ronstan Series 40 Ratchet Orbit Block - Single - Auto - Swivel Shackle Head

Sale price$69.60 Regular price$77.33
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Description

Ronstan Series 40 Ratchet Orbit Block - Single - Auto - Swivel Shackle HeadSeries 40 Ratchet Orbit Block Single Auto Swivel Shackle Head Automatic Ratchet 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. Awesome Ratchet Block Holding Power Quite simply, Ronstan Ratchet Orbit Blocks have the highest holding power available. The sophisticated NC

Series 40 Ratchet Orbit Block™ - Single - Auto - Swivel Shackle Head

Automatic Ratchet
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.

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 sheave cross-hole geometry. The Series 40 delivers up to 14:1 holding power, almost double that of our nearest competititor.

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 minimise 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 moulded 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.

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.

Features:

  • Up to 14:1 holding power - highest available!
  • Smooth easing of sheets
  • Fully Automatic load sensing ratchet engagemen
  • Swivel shackle head for unlmited block rotation
  • Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points


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 anodised Aluminium
  • Ball Bearings: High compression strength carbon black Acetal
  • Frame/Cheeks: Toughened, glass fiber reinforced Nylon
  • Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema®


Specifications:
Sheave Ø: 40mm(1-9/16")
Max. Rope Ø: 9mm(5/16")
M.W.L.: 175kg(385lbs)
B. L.: 500kg(1,100lbs)
Weight: 44g(1.5oz)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 50908257109

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4.2 ★★★★★
Based on 23 reviews
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Adrián
Dallas, US
★★★★★ 5
Great coffee grinder!
Color: Silver
Amazing product. Easy to use and has different grades of grinding. Zero noise compared with an electric grinder and more control of the results (consistent). His size and weight make it portable and easy to carry.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
B
Verified Purchase
Basil Walls
Port Orchard, US
★★★★★ 4
Quite good as a start grinder
Color: Silver
Very good burr grinder with very functional adjustments. Holds the perfect amount in 1 go for my pour over setup. My only critique is that is has 3 unconnected hopper sections that are quite small and hard to hit. I have to be very careful to not spill and one can fill before the other 2 causing some difficulties closing the crank, but it just takes some self adjustments to get around. Overall I'm very pleased with it for the price.
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Reviewed in the United States on June 1, 2026
D
Verified Purchase
DarthVaderVan
Dallas, US
★★★★★ 5
Great Quality, Great Price.
Color: Black
I have used this for a few days now and it works great. It is very well made and has a large range of adjustability. It is quite small and easy to store. Definitely worth the money.
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Reviewed in the United States on May 6, 2026
C
Verified Purchase
Claude Figueroa
Lake Worth, US
★★★★★ 5
Nice Grinder at a Great Price
Color: Black
I bought this to use primarily as a travel grinder and found that it is great for every day use. It is not meant for large amounts but it is perfect for single, smaller brewing situations. The grind selection worked well and I "dialed" the proper ground size for my single sized pour over coffee maker.
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Reviewed in the United States on May 19, 2026
K
Verified Purchase
Karin Conover-Lewis
Carnegie, US
★★★★★ 1
Ceramic burr destroyed itself
Color: Silver
For the first two-plus months it worked fine -- the perfect grind and the perfect amount with a full barrel for my oversized coffee mug. I've been using it once daily, more or less, on a medium grind setting of 25, and this morning the ceramic burr started to eat itself. This is not acceptable. Follow up: Circle Joy contacted me and offered to give a full refund on this purchase, which was gratefully accepted. This is outstanding customer service.
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Reviewed in the United States on April 28, 2026

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