Series 40 Ratchet Orbit Block - Single - Auto - Swivel Shackle HeadAutomatic RatchetWith 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 PowerQuite 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 AttachmentThe 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 SheetsWith 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 AlignmentStand-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
Specifications:Sheave : 40mm(1-9/16")
Max. Rope : 9mm(5/16")
M.W.L.: 175kg(385lbs)
B. L.: 500kg(1,100lbs)
Weight: 44g(1.5oz)
The Ronstan Series 40 Ratchet Orbit Block is engineered for high-performance sailing applications, offering exceptional holding power and smooth sheet handling. Featuring an automatic ratchet mechanism, this block engages when load is applied and disengages when released, allowing for rapid and controlled easing of sheets—ideal for gybing asymmetric spinnakers or quick sail adjustments. Its innovative design ensures the sheet runs out freely and smoothly, reducing effort and increasing precision during operation. Constructed with a durable stainless steel shackle head, the block withstands harsh marine environments, providing long-lasting reliability in demanding conditions.
Ronstan's sophisticated NC-machined sheave incorporates Generation 2 cross-hole geometry with eight gripping faces that directly resist line movement. This unique sheave design distributes load evenly across straight resistance faces, minimizing rope wear and maximizing grip with a holding power of up to 14:1—almost double that of similar products. The high load capacity combined with a low profile allows for easy integration into various sailing setups, including dinghy mainsheet systems and sportsboat fine-tune systems.
The block features a swivel shackle head, enabling unlimited rotation for optimal line alignment and ease of use. Its compact construction is complemented by a stand-up kit option with a rubber boot, which provides a low-profile, clatter-free setup that can be aligned either with or across the stand-up base for full articulation. The Dyneema link attachment system simplifies installation, securely retaining the connection with a molded retainer clip, and is compatible with Dyneema, Spectra, webbing, and carbon connection points—offering versatile attachment options beyond traditional steel shackles.
Designed for ease of operation and durability, the Ronstan Series 40 Ratchet Orbit Block is perfect for demanding sailing environments. Its lightweight construction at just 1.5 ounces and compact size ensure minimal weight addition while delivering maximum performance. Whether used in dinghy mainsheet systems or for fine-tuning on sportboats, this high-quality block is built to withstand continuous use and harsh marine conditions, making it an essential component for serious sailors seeking reliable and efficient sheet management.
Features:
- Up to 14:1 holding power—highest available in its class
- Smooth sheet easing with automatic load sensing ratchet
- Swivel shackle head allows unlimited rotation for optimal line control
- Stainless steel shackle head for durability and environmental resistance
- Compatible with Dyneema/Spectra strops, webbing, and carbon connection points
- Low profile stand-up kit with rubber boot for secure, clatter-free operation
- Lightweight design at approximately 1.5 ounces for minimal weight impact
