Ronstan RF55210 Orbit 55mm Double Pulley – Becket & Swivel Shackle Head Block

The Ronstan RF55210 Orbit Double Pulley Block with 55mm sheaves, swivel shackle head, and integrated becket is a high-performance rigging solution designed for mainsheet systems, vangs, and traveller controls on racing dinghies, sportsboats, and keelboats. As part of Ronstan’s top-tier Orbit Series, it delivers superior strength, minimal friction, and ultra-lightweight construction.

Built with fibre-reinforced composite cheeks, acetal ball bearing sheaves, and 316 stainless steel load straps, the RF55210 ensures smooth operation, durability, and excellent strength-to-weight performance. The swivel shackle head allows for precise alignment under load, and the becket provides easy termination for secondary lines.

Specifications:

• Sheave Diameter: 55mm

• Max Rope Diameter: 10mm

• Materials: Acetal sheaves, reinforced composite cheeks, stainless hardware

• Bearings: Acetal ball bearings for low-friction operation

• Configuration: Double pulley with becket and swivel shackle head

• Applications: Mainsheet systems, vangs, traveller lines, high-load control setups

• Features: Lightweight, high-strength, low-friction, corrosion-resistant

Built for peak performance in demanding conditions. Available now from Barton Marine NZ, your trusted source for Ronstan Orbit blocks and advanced sailing hardware.

• M.W.L. 750* kg
• B. L. 1500 kg
• Weight 172 g