Description
Ronstan Series 15 Double Ball Bearing Block | Boat Supply Store
For dinghies and small keelboats, particularly competitive racers seeking to reduce weight and friction on control lines, this Ronstan Series 15 block is engineered for maximum efficiency in a minimal form factor. Its precision molded acetal sheaves rotate on stainless steel ball bearings, achieving exceptionally low friction for demanding applications. Designed as the smallest and lightest ball bearing block in its class, it excels in critical systems like vangs, cunninghams, and tweakers where every gram and each degree of reduced friction matters.
Key Features
- Smallest and lightest ball bearing block for demanding applications
- Precision molded acetal sheave for smooth operation
- High-performance stainless steel ball bearings minimize friction
- Durable UV stabilized acetal sheaves resist degradation
- Corrosion-resistant Grade 316 stainless steel cheeks
- Integrated O-ring isolates running line from lashing
- Compact loop head for secure lashing or shackle attachment
- Optimized for control lines on dinghies and small keelboats
Specifications
| Product Specifications | |
|---|---|
| Sheave Material | UV stabilized acetal |
| Ball Bearing Material | Stainless steel |
| Cheek Material | Grade 316 stainless steel |
| Head Type | Loop Head |
| Line Size | Specified by user choice based on application |
| Working Load Limit (WLL) | Not explicitly stated, for light to medium loads |
| Weight | Ultra-lightweight, smallest in class |
Who This Is For
Sailors of dinghies and small keelboats, especially those focused on competitive racing or performance optimization on control lines. Ideal for individuals prioritizing minimal weight and high efficiency for systems like vangs, cunninghams, and tweakers.
How It Compares
| Feature | Ronstan Series 15 Double Ball Bearing Block | Competitor |
|---|---|---|
| Sheave Material | UV stabilized acetal | Carbo-Lite composite |
| Ball Bearing Material | Stainless steel | Yes |
| Cheek Material | Grade 316 stainless steel | Composite |
| Head Type | Loop Head | Swivel |
| Size/Weight Focus | Smallest and lightest ball bearing block | Lightweight composite construction |
Common Concerns Answered
Will this block handle very high loads?
This Ronstan Series 15 block is optimized for minimal size and weight, making it ideal for lighter control lines on dinghies and small keelboats. For very high-load applications, larger blocks with higher WLL ratings would be more appropriate.
Is the loop head versatile enough for mounting?
The loop head is designed for direct lashing or attachment via a shackle, providing a secure and lightweight connection. While it offers excellent security for its intended use, it may limit some mounting options compared to swivel head blocks, which offer more articulation.
Is the perceived cost high for such a small block?
The value of this block lies in its specialized design as the smallest and lightest ball bearing block available, featuring precision engineering for optimal performance. For applications where minimizing weight and friction on critical control lines is paramount, its unique attributes justify the investment.
Frequently Asked Questions
What is the maximum line size for the Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head?
The specific maximum line diameter is not stated, but it is designed for control lines on dinghies and small keelboats, typically ranging up to 8mm (5/16"). Consult the technical specifications or Ronstan for precise guidance based on your application.
What are the dimensions of the Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head?
Specific dimensions are not provided in this listing, but its defining characteristic is its ultra-minimal size and lightweight construction, making it the smallest in its class.
What is the working load limit (WLL) of the Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head?
The Working Load Limit (WLL) is not explicitly provided, as this block is engineered for light to medium loads common in dinghy and small keelboat control systems. For high-load applications, a block with a higher WLL rating is recommended.
Can this block be used for high-load applications?
No, this block is specifically designed for minimal size and weight on control lines in dinghy and small keelboat applications, not for high-load situations. For higher loads, consider larger diameter blocks with higher WLL ratings.
What type of maintenance is required for this block?
Periodic rinsing with fresh water after saltwater use is recommended. Inspect the sheave and bearings for debris and smooth rotation. Avoid harsh solvents; a mild soap and water solution is suitable for cleaning if necessary.
