Ronstan Series 25 Ball Bearing Orbit Block with Becket and Lashing - RF28109

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 Becket and Lashing (Part Number RF28109) is designed for high-performance sailing applications on small boats and dinghies up to 13 feet. This compact 25mm block combines lightweight construction with exceptional durability, making it ideal for control lines such as mainsheets, spinnaker sheets, cunninghams, and cascading vangs. Its high-strength acetal ball bearing system ensures smooth operation and reliable performance under demanding conditions. Featuring a stainless steel hub, the orbit block offers versatile lashing options for up to 5/32 inch (4mm) lashing, and the through-sheave becket allows for flexible rigging setups. This design makes the block suitable for a wide range of applications, providing sailors with a reliable and efficient solution for their control line needs. Constructed with toughened, glass-fiber-reinforced nylon and high compression strength acetal components, the Ronstan Series 25 Orbit Block delivers excellent strength-to-weight ratio while maintaining a lightweight profile. It supports up to 8mm (5/16 inch) lines and offers a maximum breaking load of 1650 pounds, ensuring durability and safety during intense sailing maneuvers. Whether used for mainsheet and spinnaker sheet turning, control lines, leech lines, or cascading vangs, this orbit block enhances rigging efficiency and reliability. Its compact size and robust construction make it a popular choice among competitive sailors and performance-focused boaters seeking a dependable, lightweight control line solution.

Features:
* 2-stage ball bearing system for smooth operation
* Suitable for lines up to 8mm (5/16 inch) in diameter
* Hollow hub designed for becket take-off
* Lashing blocks accommodate up to 4mm (5/32 inch) lashing
* Stainless steel hub for versatile lashing attachments
* Constructed with high compression strength acetal bearings
* Frame and cheeks made from toughened, glass-fiber-reinforced nylon
* Supports high demand applications on small racing dinghies