Ronstan Series 25 Ball Bearing Orbit Block with Becket and Swivel Shackle - RF28100

Series 25 Ball Bearing Orbit Block - Becket Swivel Shackle

Single sheave ball bearing block with becket hub and swivel shackle head.

Series 25 Ball Bearing Orbit Blocks, delivering 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 meters.

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
• M.W.L. (lb): 500
• Sheave diameter (in): 1
• B.L. (lb): 990
• Weight (oz): 0.6

Applications:

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

Materials:

• Frame/cheeks: Toughened, glass fibre reinforced nylon.
• BB Sheave and balls: high compression strength acetal.

The Ronstan Series 25 Ball Bearing Orbit Block with Becket and Swivel Shackle is engineered for high-performance sailing and rigging applications on small boats and dinghies up to 13 feet. Constructed with a toughened, glass fiber reinforced nylon frame and cheeks, this compact 25mm block offers exceptional strength and durability while maintaining a lightweight profile. Its innovative two-stage ball bearing system ensures smooth operation under high loads, making it ideal for control lines such as mainsheet, spinnaker sheet, cunninghams, and cascading vangs. Designed with competitive sailors in mind, the Ronstan Series 25 orbit block delivers an optimal strength-to-weight ratio, enabling precise control and reliable performance even in demanding conditions. The stainless steel hub allows versatile lashing attachments up to 5/32 inch (4mm), and the hollow becket hub enables efficient take-off for various rigging setups. With a maximum working load of 500 pounds and a breaking load of 990 pounds, this block is built to withstand rigorous sailing environments. Its compact size and durable construction make it a versatile choice for various control line systems, ensuring smooth operation and long-lasting performance on high-demand boats. Whether used for mainsheet turning, spinnaker controls, or other control line applications, the Ronstan Series 25 orbit block provides a reliable and lightweight solution that enhances overall sailing efficiency and responsiveness.

Features:

• Two-stage ball bearing system for smooth operation

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

• Hollow hub designed for becket take-off

• Lashing compatibility up to 4mm (5/32) for versatile rigging