Description
Ronstan Series 40 Ball Bearing Block | Boat Supply Store
Engineered for demanding sailing applications, this Ronstan Series 40 block ensures exceptionally low friction and consistent load handling for critical control lines. Its 40mm Acetal or Torlon® 2-stage ball bearing system effectively manages loads up to 350kg MWL, while the Captive Lock™ universal head offers versatile rigging configurations. This block is crucial for optimizing mainsails, halyards, vangs, and spinnaker control on off-the-beach catamarans and performance sportsboats up to 8 meters.
Key Features
- Superior Performance with Acetal or Torlon® 2-stage ball bearings
- Consistent Load Handling ensured by the 2-stage bearing system
- Versatile Rigging via the Captive Lock™ universal head
- Low Friction Operation for efficient sail control
- Durable Construction with U.V. stabilized acetal sheaves and reinforced nylon cheeks
- Easy Maintenance due to cheek cut-outs for bearing access
- Secure Rigging with a slotted pin shackle to prevent fouled lines
- Lightweight Design at only 70g
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 40mm |
| Max Rope Diameter | 10mm |
| Pin Diameter | 5mm |
| Working Load Limit (MWL) | 350kg |
| Breaking Load (BL) | 1,000kg |
| Weight | 70g |
| Bearing System | Acetal or Torlon® 2-stage ball bearings |
| Cheek Material | Impact and U.V. resistant, fiber reinforced Nylon |
| Sheave Material | U.V. Stabilized Acetal |
| Fittings Material | Grade 316 stainless steel |
Who This Is For
Sailors and boaters with sailboats up to 8 meters (26 feet) requiring high-performance, low-friction, and durable single blocks for mainsails, halyards, vangs, and spinnaker control lines. Particularly beneficial for off-the-beach catamarans, one-design classes, and sportsboats.
How It Compares
| Feature | Ronstan Series 40 Ball Bearing Block | Harken 163 Carbo |
|---|---|---|
| Sheave Ø | 40mm | — |
| Max. Rope Ø | 10mm | — |
| M.W.L. | 350kg | — |
| Bearing System | Acetal or Torlon® 2-stage ball bearings | Carbo-Lite |
| Head Type | Captive Lock™ Universal Head | Swivel Head |
| Weight | 70g | Approx. 40g |
Common Concerns Answered
Is the Captive Lock™ mechanism difficult to operate?
While some users find the Captive Lock™ mechanism slightly stiff during initial engagement, this is typical for secure locking systems and typically smooths out with use, ensuring reliable head positioning.
How durable is the sheave under heavy use?
Occasional reports of sheave wear occur with extended, heavy-duty use; however, this is generally considered normal wear for demanding sailing applications and indicates the block is performing its intended function under significant load.
Is the price a significant barrier compared to simpler blocks?
The Ronstan Series 40 block's price reflects its advanced engineering, superior materials, and exceptional performance, offering long-term value through enhanced efficiency and durability for serious sailors that outweighs the initial cost compared to basic alternatives.
Frequently Asked Questions
What is the maximum rope diameter this Ronstan Series 40 block can accommodate?
The Ronstan Series 40 Ball Bearing Block - Single - Universal Head can accommodate a maximum rope diameter of 10mm.
What is the Working Load Limit (WLL) for the Ronstan Series 40 Ball Bearing Block?
The Working Load Limit (MWL) for the Ronstan Series 40 Ball Bearing Block is 350kg.
Can the universal head on this Ronstan block be fixed in place?
Yes, the Captive Lock™ universal head on this Ronstan block allows for both fixed and swivel positioning, providing adaptable rigging configurations.
What type of bearings does the Ronstan Series 40 block use?
The Ronstan Series 40 block utilizes a high-performance Acetal or Torlon® 2-stage ball bearing system for superior load handling and low friction.
What are the typical applications for the Ronstan Series 40 Ball Bearing Block - Single - Universal Head?
Typical applications include mainsails, halyards, vangs, and spinnaker control lines on smaller performance sailboats up to 8 meters, such as off-the-beach catamarans, one-design classes, and sportsboats.
