Ronstan RF55310 Orbit 55mm Triple Pulley – Swivel Shackle Head with Becket

The Ronstan RF55310 Orbit 55mm Triple Pulley Block with swivel shackle head and becket is engineered for high-load sail control systems on performance keelboats and sportsboats. Part of the elite Ronstan Orbit Series, this triple block delivers maximum strength, efficiency, and versatility in a lightweight design optimised for racing.

It features three 55mm acetal sheaves with ball bearings, fibre-reinforced composite cheeks, and 316 stainless steel load straps for exceptional durability in marine environments. The integrated becket allows for secure line termination, while the swivel shackle head enables proper alignment under load—ideal for mainsheet systems, vangs, and traveller setups.

Specifications:

• Sheave Diameter: 55mm

• Max Rope Diameter: 10mm

• Bearings: Acetal ball bearings for smooth, low-friction operation

• Materials: Fibre-reinforced composite cheeks, acetal sheaves, stainless steel head

• Configuration: Triple pulley with becket and swivel shackle head

• Applications: Mainsheet systems, traveller controls, multi-line sail trim setups

• Features: Lightweight, high-strength, corrosion-resistant, race-optimized

The RF55310 is built to meet the demands of competitive sailing. Available now at Barton Marine NZ, your trusted source for Ronstan Orbit performance blocks and sailing hardware.

• M.W.L. 750* kg
• B. L. 1500 kg