Ronstan Series 25 Ball Bearing Orbit Block - Lashing for Dinghies & Small Boats

Series 25 Ball Bearing Orbit Block - Lashing

Single sheave ball bearing block with becket and lashing head.

The Series 25 Ball Bearing Orbit Blocks deliver superior strength, reduced weight, and exceptional performance for high-demand dinghy and small boat applications.

Designed with competitive sailors and performance boats in mind, these compact 25mm blocks are engineered to achieve the highest possible strength-to-weight ratio. Featuring Ronstans renowned high-compression strength acetal bearing system, the Series 25 BB Orbit Blocks are a lightweight yet durable solution, ideal for control line systems such as mainsheet and spinnaker sheet turning blocks, cunninghams, and cascading vangs on dinghies up to 4 metres.

Each block has a stainless steel hub for versatile lashing attachments and through-sheave becket functionality, making them adaptable to a wide range of rigging setups. The hub accommodates up to 4mm (5/32) lashing and ensures maximum efficiency without compromising reliability.

Features:

• 2-stage ball bearing system.
• Suits up to 8mm (5/16) lines.
• Hollow hub for becket take-off.
• Lashing blocks suit up to 4mm (5/32) lashing.

Specifications:

• Max. Rope diameter (in): 5/16
• Sheave diameter (in): 1
• B.L. (lb): 1650
• Weight (oz): 0.5

Applications:

• Mainsheet and spinnaker sheet turning blocks on dinghies to 4m (13ft).
• Control lines.
• Cascading vangs.
• Leech lines cunninghams.

Materials:

• BB Sheave and balls: High compression strength acetal.
• Frame/cheeks: Toughened, glass-fiber-reinforced nylon.

The Ronstan Series 25 Ball Bearing Orbit Block with lashing head is designed for high-performance sailing applications, combining durability and lightweight construction. Featuring a single sheave with a becket and a stainless steel hub, this compact 25mm block is ideal for controlling lines on dinghies up to 13 feet long. Its high compression strength acetal bearing system ensures smooth operation under demanding conditions while maintaining a low weight, making it an excellent choice for competitive sailors seeking reliable control line management. The orbit block's lashing capability accommodates up to 4mm (5/32 inch) lashing, providing versatility in rigging setups and allowing for secure attachment to various points on the boat. Its robust construction and precision engineering ensure consistently reliable performance in high-stress environments, whether used for mainsheet, spinnaker sheet turning, or control lines such as vang and cunninghams. The hollow hub design facilitates easy becket take-off, simplifying line routing and adjustment. Crafted with a toughened, glass-fiber-reinforced nylon frame and high compression strength acetal sheave and balls, this orbit block offers the perfect balance of strength and weight savings. Overall, the Ronstan Series 25 Ball Bearing Orbit Block is an essential component for sailors who demand efficiency, durability, and performance from their control line hardware. Its compact size and versatile features make it suitable for a wide range of rigging configurations on small racing dinghies, ensuring optimal line control and ease of handling during high-speed maneuvers and challenging conditions.

Features:

• 2-stage ball bearing system for smooth operation

• Suitable for up to 8mm (5/16 inch) lines

• Hollow hub design allows for becket take-off

• Lashing blocks support up to 4mm (5/32 inch) lashing for versatile rigging