Description
Ronstan Series 40 Triple Swivel Block | Boat Supply Store
Engineered for demanding trim applications on smaller performance vessels, this Ronstan Series 40 triple block minimizes friction through its advanced 2-stage Acetal or Torlon® ball bearing system. Its robust construction ensures reliability for mainsail, halyard, vang, and spinnaker control lines on boats up to 8m (26ft). The UV stabilised Acetal sheave and Grade 316 stainless steel components deliver exceptional durability in harsh marine environments.
Key Features
- Minimized friction through 2-stage ball bearing system
- Lightweight construction for reduced system weight
- Easy maintenance via accessible cheek cut-outs
- 360-degree rotation with swivel shackle head
- Consistent performance across load ranges
- UV stabilised Acetal sheave for extended life
- Grade 316 stainless steel load strap and head fitting
- Impact and UV resistant fiber reinforced Nylon cheeks
Specifications
| Product Specifications | |
|---|---|
| Block Size | Series 40 |
| Number of Sheaves | 3 |
| Sheave Diameter | 40mm |
| Bearing System | Acetal or Torlon® Ball Bearings (2-stage) |
| Head Type | Swivel Shackle |
| Load Strap Material | Grade 316 Stainless Steel |
| Head Fitting Material | Grade 316 Stainless Steel |
| Cheek Material | Impact and UV resistant, fiber reinforced Nylon |
| Sheave Material | UV stabilised Acetal |
| Maximum Boat Length | 8m (26ft) |
| Applications | Mainsail, Halyard, Vang, Spinnaker Control Lines |
Who This Is For
Sailors and boat owners of off-the-beach catamarans, one design classes, and sportsboats up to 8m (26ft). Ideal for those requiring high-performance, low-friction, and durable triple blocks for critical control lines.
How It Compares
| Feature | Ronstan Series 40 Triple Swivel Block | Competitor |
|---|---|---|
| Sheave Diameter | 40mm | — |
| Bearing System | Acetal or Torlon® Ball Bearings (2-stage) | Carbo-Air |
| Head Type | Swivel Shackle | Swivel Shackle |
| Number of Sheaves | 3 | 3 |
| Maintenance Access | Cheek cut-outs | Not specified |
Common Concerns Answered
The price of specialized blocks can be high. Is this block worth the investment?
While the initial cost may be higher than basic blocks, the Ronstan Series 40 offers superior low-friction performance and exceptional durability through its 2-stage ball bearing system and robust construction. This translates to smoother operation, reduced wear on lines, and reliable performance in demanding conditions, making it a valuable investment for serious sailors.
Is the Torlon® bearing option readily available and necessary?
The Torlon® bearing option provides enhanced load-bearing capabilities and friction reduction, particularly beneficial for very high-load applications or where extreme durability is paramount. While the Acetal bearing system offers excellent performance for most applications, the availability of Torlon® can vary. For most recreational use on boats up to 8m, the Acetal system provides outstanding results.
How does this block compare to less expensive alternatives?
The Ronstan Series 40 block utilizes a sophisticated 2-stage ball bearing system (Acetal or Torlon®), Grade 316 stainless steel fittings, and impact-resistant Nylon cheeks. This advanced design significantly reduces friction and enhances longevity compared to simpler blocks, ensuring smoother operation and greater reliability under load.
Frequently Asked Questions
What is the maximum load capacity of the Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head?
The specified maximum load capacity for the Ronstan Series 40 Ball Bearing Block (RF40300) is 1000kg (2200lbs).
What type of bearing system does this block use?
This block utilizes a high-performance 2-stage ball bearing system, available with either Acetal or Torlon® balls, ensuring extremely low friction.
What are the typical applications for this block?
Typical applications include mainsail control, halyard management, vang systems, and spinnaker control lines on performance sailboats up to 8 meters (26 feet).
What materials are used in the construction of this block?
The block features UV stabilised Acetal sheaves, Grade 316 stainless steel load straps and head fittings, and impact and UV resistant fiber reinforced Nylon cheeks.
Is the swivel head shackle removable or fixed?
The swivel head shackle on the Ronstan Series 40 Triple Swivel Head Ball Bearing Block is a fixed component designed for 360-degree rotation.
