Description
Ronstan Series 20 Ball Bearing Block | Boat Supply Store
For precise control of vangs, cunninghams, or traveller lines on smaller sailboats, this Ronstan Series 20 block offers superior efficiency. It features Acetal sheaves running on stainless steel ball bearings, delivering minimal friction and a high static load capacity of 200kg (440lbs). The impact and UV-resistant Nylon cheeks ensure durability in harsh marine environments, making it a reliable component for dinghy racing or cruising.
Key Features
- Low friction for effortless control line adjustment
- High static and dynamic load capacity (200kg MWL) for demanding applications
- Lightweight design minimizes system weight
- Precision molded Acetal sheaves ensure smooth running
- Stainless steel ball bearings provide optimal performance and longevity
- U.V. Stabilized Acetal for extended outdoor life
- Grade 316 stainless steel load strap and head fitting for corrosion resistance
- Impact and UV resistant, fiber reinforced Nylon cheeks offer robust protection
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 20mm (3/4") |
| Max Rope Diameter | 6mm (1/4") |
| Max Working Load (MWL) | 200kg (440lbs) |
| Breaking Load (BL) | 550kg (1,210lbs) |
| Weight | 17g (0.6oz) |
| Mounting Type | Cheek Rivet Mount |
| Sheave Material | Acetal |
| Bearing Material | Stainless Steel |
| Cheek Material | Fiber Reinforced Nylon |
Who This Is For
Dinghy sailors and small sailboat owners requiring robust, low-friction control line management. Ideal for applications such as vang, cunningham, and traveller controls where reliability is paramount.
How It Compares
| Feature | Ronstan Series 20 Ball Bearing Block | Competitor |
|---|---|---|
| Sheave Ø | 20mm | — |
| Max. Rope Ø | 6mm | — |
| M.W.L. | 200kg | — |
| Weight | 17g | 20g | 25g |
| Mounting Type | Cheek Rivet Mount | Swivel Shackle | Fixed Eye |
Common Concerns Answered
Is this block too small for larger dinghies?
The Ronstan Series 20 block is optimized for dinghy applications and small sailboats. For very large dinghies or heavy-duty systems, a larger block with a higher MWL might be more appropriate. Verify the required load capacity for your specific application.
What is involved in rivet mounting?
Cheek rivet mounting requires a drill to create mounting holes and a pop rivet gun to securely fasten the block. Ensure proper alignment and use appropriate marine-grade rivets for a durable installation.
I'm concerned about the load capacity for my application.
This Ronstan Series 20 block has a Max Working Load (MWL) of 200kg (440lbs). For applications exceeding this limit, consider alternative blocks with higher load ratings to ensure safety and performance.
Frequently Asked Questions
What is the maximum rope diameter this Ronstan Series 20 block can accommodate?
The Ronstan Series 20 Ball Bearing Block is designed to accommodate a maximum rope diameter of 6mm (1/4").
What is the working load limit (MWL) for the Ronstan Series 20 Ball Bearing Block?
The Max Working Load (MWL) for the Ronstan Series 20 Ball Bearing Block is 200kg (440lbs).
What are the typical applications for the Ronstan Series 20 Ball Bearing Block?
Typical applications include control lines on dinghies and small sailboats, such as vangs, cunninghams, and traveller controls, where low friction and high load capacity in a compact size are beneficial.
What materials are used in the construction of the Ronstan Series 20 Ball Bearing Block?
It features precision molded Acetal sheaves, runs on stainless steel ball bearings, has a Grade 316 stainless steel load strap and head fitting, and impact and UV resistant, fiber reinforced Nylon cheeks.
How is the Ronstan Series 20 Ball Bearing Block mounted?
This specific model features a Cheek Rivet Mount, meaning it can be secured using screws or pop rivets directly through the cheeks.