Description
Ronstan Series 30 Double Ball Bearing Orbit Block | Boat Supply Store
For dinghies up to 5m (16') and control lines on larger yachts, this block provides exceptional load-bearing capacity and minimal friction. Its Acetal sheave and ball bearings, combined with toughened glass fiber reinforced Nylon cheeks, deliver a 450kg (990lbs) Working Load Limit (MWL) with a sheave diameter of 30mm (1-3/16"). This precision-engineered component is ideal for demanding mainsail, spinnaker, halyard, vang, and backstay applications where performance and weight savings are critical.
Key Features
- Unrivaled strength-to-weight ratio due to all-composite construction.
- Precision ball bearing design ensures minimum friction for smooth operation.
- Lightweight yet highly durable with fiber-reinforced composites.
- High Working Load Limit (MWL) of 450kg for demanding applications.
- Versatile attachment options for secure and adaptable rigging.
- Low profile and compact design minimizes deck clutter.
- UV stabilized Dyneema® link for enhanced longevity.
- Optimized for rope diameters up to 8mm (5/16").
Specifications
| Product Specifications | |
|---|---|
| Sheave Ø | 30mm (1-3/16") |
| Max. Rope Ø | 8mm (5/16") |
| M.W.L. | 450kg (990lbs) |
| B.L. | 900kg (1,980lbs) |
| Weight | 50g (1.7oz) |
| Construction Materials | Acetal sheave and ball bearings, toughened glass fiber reinforced Nylon cheeks, UV stabilized Dyneema® link |
Who This Is For
Sailors and boaters with dinghies up to 5m (16') requiring high-performance, lightweight, and durable block systems for critical lines. Also suitable for control lines on larger yachts where precision and efficiency are paramount.
How It Compares
| Feature | Ronstan Series 30 Double Ball Bearing Orbit Block | Competitor |
|---|---|---|
| Sheave Ø | 30mm (1-3/16") | — |
| Max. Rope Ø | 8mm (5/16") | — |
| M.W.L. | 450kg (990lbs) | — |
| Weight | 50g (1.7oz) | Approx. 30g, Approx. 70g |
Common Concerns Answered
Are the attachment options difficult to use?
While some users find the versatile attachment options require a slight learning curve compared to simpler blocks, they offer superior security and adaptability for complex rigging setups.
Is this block suitable for very heavy loads?
The Ronstan Series 30 Ball Bearing Orbit Block™ - Double is engineered for its class with a 450kg MWL; for applications exceeding these limits, Ronstan offers larger and specialized block series.
Is the initial cost justified?
The initial investment in this high-performance block is offset by its superior durability, exceptional load-bearing capacity, and significant weight savings, making it a cost-effective solution for serious sailors over the long term.
Frequently Asked Questions
What is the maximum rope diameter this Ronstan Series 30 Ball Bearing Orbit Block™ can accommodate?
The Ronstan Series 30 Ball Bearing Orbit Block™ - Double is designed to accommodate a maximum rope diameter of 8mm (5/16").
What is the working load limit (MWL) for the Ronstan Series 30 Ball Bearing Orbit Block™ - Double?
The Working Load Limit (MWL) for the Ronstan Series 30 Ball Bearing Orbit Block™ - Double is 450kg (990lbs).
What are the primary applications for the Ronstan Series 30 Ball Bearing Orbit Block™ - Double?
Primary applications include mainsail, spinnaker, halyard, vang, and backstay systems on dinghies up to 5m (16'), as well as control lines on larger yachts.
What materials are used in the construction of the Ronstan Series 30 Ball Bearing Orbit Block™ - Double?
It is constructed with an Acetal sheave and ball bearings, toughened glass fiber reinforced Nylon cheeks, and a UV stabilized Dyneema® link.
How does the Ronstan Series 30 Ball Bearing Orbit Block™ - Double achieve its high strength-to-weight ratio?
Its high strength-to-weight ratio is achieved through an advanced all-composite construction utilizing fiber-reinforced polymers and precision design for optimum performance and minimal mass.
