Description
Ronstan Series 30 Ball Bearing Block | Boat Supply Store
Engineered for demanding sailing applications, this block offers exceptional strength-to-weight performance, crucial for efficient sail control on dinghies up to 5m or control lines on larger vessels. Its precision ball bearing system ensures minimal friction, with a 30mm Nylatron® sheave rated for ropes up to 8mm and a Maximum Working Load of 300kg. The toughened glass fiber reinforced Nylon cheeks provide superior durability and weight reduction for reliable operation in challenging marine environments.
Key Features
- Highest strength-to-weight ratio for superior performance
- All-composite reinforced polymer materials ensure longevity
- Precision design minimizes friction for optimal ball bearing operation
- Weight reduction achieved through advanced fiber-reinforced composites
- Self-lubricating Nylatron® sheave for smooth, consistent operation
- Full contact bearing design handles high dynamic loads effectively
- Ultra low profile thru-sheave becket minimizes snagging
- Accepts RF1850S shackle in both orientations for versatile attachment
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 30mm |
| Max Rope Diameter | 8mm |
| Maximum Working Load (MWL) | 300kg |
| Breaking Load (BL) | 600kg |
| Weight | 22g |
| Sheave Material | Nylatron® |
| Bearing Material | Acetal |
| Cheek Material | Toughened glass fiber reinforced Nylon |
Who This Is For
Sailors of dinghies up to 5m (16') requiring high-performance, lightweight, and durable blocks for mainsail, spinnaker, halyard, vang, and backstay systems. Also suitable for control line applications on larger yachts.
How It Compares
| Feature | Ronstan Series 30 Ball Bearing Block | Competitor |
|---|---|---|
| Sheave Ø | 30mm | — |
| Max. Rope Ø | 8mm | — |
| M.W.L. | 300kg | — |
| Weight | 22g | 20g, 35g |
| Bearing Type | Ball Bearing | Carbo-Ratch, Synchro |
Common Concerns Answered
Is the price justified for this block?
While the initial investment may seem higher, the Ronstan Series 30 Ball Bearing Orbit Block™ offers an exceptional strength-to-weight ratio and superior durability due to its advanced composite construction and precision ball bearing system, providing long-term value for serious sailors.
What are the benefits of the composite materials used?
The use of all-composite reinforced polymer materials, including toughened glass fiber reinforced Nylon cheeks and a Nylatron® sheave, significantly reduces weight while maintaining high strength and providing excellent wear resistance and self-lubricating properties.
How does the lashing head attachment facilitate installation?
The lashing head design allows for direct attachment to a desired point on the boat using appropriate cordage, offering a secure and low-profile connection. It also accommodates a compatible shackle for alternative mounting configurations.
Frequently Asked Questions
What is the working load limit (MWL) of the Ronstan Series 30 Ball Bearing Orbit Block™?
The Maximum Working Load (MWL) for the Ronstan Series 30 Ball Bearing Orbit Block™ is 300kg.
What is the maximum rope diameter this block can accommodate?
This block is designed to accommodate ropes with a maximum diameter of 8mm.
What are the primary applications for the Ronstan Series 30 Ball Bearing Orbit Block™?
Its primary applications include mainsail, spinnaker, halyard, vang, and backstay systems on dinghies up to 5m (16'), as well as control line applications on larger yachts.
What materials are used in the construction of this Ronstan block?
The block is constructed with a Nylatron® sheave, Acetal ball bearings, and toughened glass fiber reinforced Nylon cheeks for optimal performance and durability.
How does the lashing head attachment work on this block?
The lashing head features an integrated loop for direct attachment via lashing with suitable line, providing a secure, low-profile mounting point. It also has provisions to accept a Ronstan RF1850S shackle in either orientation.
