Description
Ronstan Series 40 Ratchet Block | Boat Supply Store
For sailors demanding superior control over critical lines, this Ronstan Series 40 Ratchet Orbit Block™ offers an industry-leading 14:1 holding power, achieved through its innovative NC-machined sheave with 8 direct gripping faces and Generation 2 geometry, significantly reducing rope wear. The fully automatic load-sensing ratchet engages seamlessly, providing secure retention under load and smooth easing when required, making it indispensable for mainsail, spinnaker, and jib applications on dinghies and sportsboats.
Key Features
- Achieve up to 14:1 holding power – the highest rating available for exceptional line control.
- Benefit from smooth easing of sheets due to the optimized ratchet mechanism.
- Experience fully automatic load-sensing ratchet engagement for instant security.
- Utilize the swivel shackle head for unrestricted block orientation and rotation.
- Employ the Dyneema® Link for a simple, strong, and secure attachment to your existing hardware.
- Benefit from the NC-machined sheave with Generation 2 geometry for reduced friction and rope abrasion.
- Rely on 8 gripping faces for direct and robust resistance against line movement.
- Achieve a low profile installation with compatibility for stand-up kits.
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 40mm |
| Max. Rope Diameter | 9mm |
| Maximum Working Load (MWL) | 175kg |
| Breaking Load (BL) | 500kg |
| Weight | 44g |
| Sheave Material | Hard anodised aluminium |
| Bearing Material | High compression strength carbon black Acetal |
| Frame/Cheeks Material | Toughened glass fiber reinforced Nylon |
| Rope Link Material | UV stabilized SK75 Dyneema® |
Who This Is For
Sailors of dinghies, sportsboats, and small keelboats requiring a high-performance, automatically engaging ratchet block for mainsail, spinnaker, jib, and control line applications. This block is ideal for those prioritizing superior holding power and exceptionally smooth line handling.
How It Compares
| Feature | Ronstan Series 40 Ratchet Block | Harken Carbo Ratch |
|---|---|---|
| Holding Power | Up to 14:1 | Up to 10:1, Up to 10:1 |
| Sheave Diameter | 40mm | — |
| Max. Rope Diameter | 9mm | — |
| Ratchet Engagement | Fully Automatic | Automatic, Automatic |
| Attachment | Swivel Shackle Head with Dyneema® Link | Swivel Shackle, Swivel Shackle |
Common Concerns Answered
Is the initial cost of this block higher than standard blocks?
While the upfront investment may be higher than basic blocks, the Ronstan Series 40 Ratchet Orbit Block™ delivers unparalleled performance and durability, justifying the cost for serious sailors prioritizing efficiency and longevity.
Does the ratchet mechanism disengage easily under load?
The fully automatic load-sensing ratchet is engineered for smooth operation. Occasional reports of requiring a firm tug to disengage under very high loads are rare and often context-specific, but the design prioritizes secure engagement and controlled release.
How does the holding power compare to other ratchet blocks?
This Ronstan block boasts the highest holding power available at up to 14:1, significantly exceeding competitors like Harken and Lewmar which typically offer up to 10:1, ensuring superior control on critical lines.
Frequently Asked Questions
How does the automatic ratchet mechanism work on the Ronstan Series 40 Ratchet Orbit Block™?
The automatic ratchet mechanism utilizes load sensing to engage seamlessly when a load is applied to the line, providing holding power. It disengages smoothly when the load is eased, allowing for effortless adjustment.
What is the holding power of the Ronstan Series 40 Ratchet Orbit Block™?
The Ronstan Series 40 Ratchet Orbit Block™ offers the highest available holding power of up to 14:1, achieved through its unique sheave geometry and gripping face design.
What is the maximum rope diameter that can be used with this block?
This Series 40 block is designed to accept ropes with a maximum diameter of 9mm.
What are the typical applications for the Ronstan Series 40 Ratchet Orbit Block™?
This block is exceptionally well-suited for mainsail, spinnaker, jib, and various control line applications on dinghies, sportsboats, and small keelboats where high holding power and precise line management are essential.
How does the Dyneema® Link attachment system work and what are its benefits?
The Dyneema® Link is a UV-stabilized SK75 Dyneema® cord that facilitates simple and secure attachment to existing rigging points, offering excellent strength-to-weight ratio and abrasion resistance compared to traditional metal links.
