Ronstan Series 20 Ball Bearing Double Block with Shackle, RF20202

Ronstan Series 20 Ball Bearing Double Block with Shackle – RF20202

Short Product Description

The Ronstan Series 20 Ball Bearing Double Block with Shackle RF20202 is a compact, high-performance double block designed for multi-purchase control systems on dinghies, foiling craft, and small keelboats. Featuring low-friction ball bearing sheaves, high load capacity, and a versatile dual-axis shackle head, it delivers smooth, efficient performance in demanding sailing applications.

Long Product Description

The Ronstan Series 20 Ball Bearing Double Block with Shackle RF20202 is engineered for sailors who require maximum efficiency, strength, and reliability in compact control systems. Designed for use in high-load purchase systems, this lightweight double block provides smooth operation and dependable performance across a wide range of sailing applications.

The RF20202 incorporates dual low-friction sheaves running on stainless steel ball bearings, ensuring efficient line movement under both dynamic and static loads. This minimises friction throughout the system, improving control responsiveness and reducing the effort required for sail adjustment.

A key feature of the RF20202 is its Dual Axis Shackle Head, which allows the block to be mounted in either orientation depending on the application. This flexible attachment system enables optimal alignment within complex rigging layouts while maintaining efficient load transfer and smooth operation.

Built using durable, marine-grade materials, the block combines a lightweight polymer housing with corrosion-resistant stainless steel components for long-term durability in harsh marine environments. Its compact size makes it particularly suitable for modern dinghies, skiffs, foiling classes, sportsboats, and small keelboats where performance and weight reduction are critical.

The RF20202 is ideal for applications such as vang systems, Cunningham controls, outhauls, traveller purchases, and other control line systems requiring multiple purchase ratios and efficient load handling.

Key Features

• Compact double-sheave block design
• Low-friction stainless steel ball bearing system
• Dual Axis Shackle Head for versatile mounting
• High static and dynamic load capacity
• Smooth and efficient line handling
• Lightweight polymer housing
• Corrosion-resistant marine-grade construction
• Optimised for multi-purchase systems
• Reliable performance under load
• Suitable for modern high-performance sailing craft

Ideal For

• Dinghy sailing
• Foiling classes
• Skiff racing
• Small keelboats
• Sportsboats
• Vang systems
• Cunningham controls
• Outhaul systems
• Traveller purchases
• Control line applications

Technical Specifications

• Model: RF20202
• Series: Ronstan Series 20
• Block Type: Double Ball Bearing Block with Shackle
• Sheave Diameter: 20mm
• Maximum Rope Diameter: 6mm
• Maximum Working Load (MWL): 350kg
• Breaking Load (BL): 700kg
• Weight: 42g
• Pin Diameter: 4mm
• Bearing Type: Stainless Steel Ball Bearings
• Attachment: Dual Axis Shackle Head

© Boat Crew Gear