Ronstan Series 20 Ball Bearing Lashing Orbit Block™, Double, RF25209

Ronstan Series 20 Ball Bearing Orbit Block™ – Double Lashing (RF25209)

Compact double 20mm ball bearing lashing block designed for high-performance control line systems on dinghies and small boats.

The Ronstan Series 20 Ball Bearing Orbit Block™ Double (RF25209) is a lightweight, high-performance lashing block designed for control line systems on dinghies and small boats.

Built for efficiency and minimal weight, this compact double block features high compression strength acetal ball bearing sheaves that deliver smooth, low-friction operation under load. Ideal for fine-tuning control systems, it provides reliable performance in demanding sailing environments where precision matters.

The lashing head design allows for flexible rigging configurations, making it easy to integrate into custom setups such as cascading vangs, cunninghams, and kite bridles. For secure attachment, the lashing line must pass through the hub with a tight splice in the head or cross over before being lashed to a fixing point, ensuring stability and load alignment during use.

Constructed with toughened nylon cheeks, the Series 20 Orbit Block™ maintains durability while keeping overall weight to a minimum. Its compact size and efficient design make it a popular choice for performance dinghy sailors looking to optimise their control systems.

Ideal For

• Dinghy sailing control systems

• Cunninghams and leech lines

• Cascading vang setups

• Kite bridles

• Lightweight, high-performance rigging applications

Key Features

• Double sheave configuration for increased mechanical advantage

• High compression strength acetal ball bearing sheaves for smooth operation

• Lightweight lashing block design for reduced rig weight

• Flexible lashing attachment for custom rigging setups

• Compact size ideal for performance dinghies and small boats

• Toughened nylon cheeks for durability and strength

• Optimised for precision control line applications

Technical Specifications

Model: RF25209
Sheave Size: 20 mm
Configuration: Double
Bearing System: Ball bearing

Materials:

• Sheaves: High compression strength acetal

• Cheeks: Toughened nylon

Rigging Note:
Lashing line must pass through the hub with a tight splice in the head or cross over before lashing to a fixing point.