Description
Ronstan 25mm Ball Bearing Orbit Block™ Lashing | Boat Supply Store
Engineered for demanding dinghy and small boat control lines, this 25mm single sheave block provides an exceptional strength-to-weight ratio with a 1650 lb breaking load. Its 2-stage ball bearing system utilizes high-compression strength acetal for minimal friction, ensuring smooth operation under load for applications like mainsheets or cascading vang systems on boats up to 4 meters. The hollow hub design facilitates becket take-off, and a stainless steel hub accepts lashing up to 4mm (5/32") for secure attachment.
Key Features
- Achieve superior performance with a 2-stage ball bearing system.
- Benefit from low friction due to high-compression strength acetal sheave and balls.
- Rely on durability from a toughened, glass-fiber-reinforced nylon frame/cheeks.
- Simplify rigging with a hollow hub for becket take-off.
- Ensure secure attachment via a stainless steel hub for versatile lashing.
- Optimize weight and space with a compact 25mm sheave diameter.
- Gain exceptional strength in a lightweight package.
- Accommodate lines up to 5/16" (8mm) for broad usability.
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 1" |
| Max. Rope diameter | 5/16" (8mm) |
| Breaking Load (B.L.) | 1650 lb |
| Weight | 0.5 oz |
| Bearing System | 2-stage ball bearing |
| Frame Material | Glass-fiber-reinforced nylon |
| Sheave Material | Acetal |
| Hub Material | Stainless Steel |
| Lashing Diameter | Up to 4mm (5/32") |
| Maximum Boat Length | 4m (13ft) |
Who This Is For
Competitive sailors and owners of performance dinghies and small boats (up to 4 meters / 13 feet) requiring lightweight, high-strength control line blocks. Ideal for mainsheet, spinnaker sheet, cunningham, and cascading vang systems.
How It Compares
| Feature | Ronstan 25mm Ball Bearing Orbit Block™ Lashing | Carbo Ratchomatic |
|---|---|---|
| Sheave Diameter | 25mm | — |
| Max Rope Diameter | 8mm (5/16") | — |
| Weight | 0.5 oz | approx. 1.4 oz |
| Breaking Load (B.L.) | 1650 lb | 1500 lb |
| Bearing Type | 2-stage ball bearing | Ball bearing |
| Lashing Capacity | Up to 4mm (5/32") | Not specified for lashing |
Common Concerns Answered
Is the price justified compared to simpler blocks?
While the initial cost may be higher than basic blocks, the Ronstan Series 25 offers a superior strength-to-weight ratio and a 2-stage ball bearing system for significantly improved performance and longevity in demanding applications. This advanced engineering is crucial for performance dinghies and small boats where efficiency and reliability are paramount.
Can I use thicker lashing lines with this block?
The stainless steel hub is designed to accommodate lashing up to 4mm (5/32"). For applications requiring thicker lashing, alternative attachment methods or blocks with larger lashing capabilities may be necessary. This specification ensures optimal performance and secure fitting for typical dinghy control lines.
Will this block handle the loads on my boat?
With a breaking load of 1650 lb, this block is specifically engineered for the rigorous demands of performance dinghies and small boats up to 4 meters (13 feet). Its robust construction and high-quality materials ensure it can reliably manage control lines such as mainsheets, spinnaker sheets, cunningham, and vang systems under typical racing or active sailing conditions.
Frequently Asked Questions
What is the maximum rope diameter this Ronstan Series 25 Ball Bearing Orbit Block™ can accommodate?
The Ronstan Series 25 Ball Bearing Orbit Block™ can accommodate a maximum rope diameter of 5/16" (8mm).
What is the breaking load (B.L.) of the Ronstan Series 25 Ball Bearing Orbit Block™?
The breaking load (B.L.) of the Ronstan Series 25 Ball Bearing Orbit Block™ is 1650 lb.
What are the typical applications for the Ronstan Series 25 Ball Bearing Orbit Block™?
Typical applications include mainsheet, spinnaker sheet, cunningham, and cascading vang systems on dinghies and small performance boats up to 4 meters (13 feet).
What is the weight of the Ronstan Series 25 Ball Bearing Orbit Block™?
The weight of the Ronstan Series 25 Ball Bearing Orbit Block™ is 0.5 oz.
What type of bearing system does the Ronstan Series 25 Ball Bearing Orbit Block™ use?
The Ronstan Series 25 Ball Bearing Orbit Block™ uses a 2-stage ball bearing system with high-compression strength acetal sheave and balls.
