Ronstan RF48100 Orbit 40mm Single Pulley – Swivel Top Sailing Block

The Ronstan RF48100 Orbit Block is a 40mm single pulley with a swivel top, engineered for maximum strength, low friction, and minimal weight—perfect for high-performance dinghies, sportsboats, and small keelboats. Part of the Orbit Series, it features lightweight fibre-reinforced polymer cheeks, acetal ball bearings, and a high-strength stainless steel head for superior load capacity and durability.

The swivel top allows for flexible alignment under load, making it ideal for mainsheet systems, control lines, and halyards. Its compact, efficient design is trusted by top sailors for responsive handling and precision rigging.

Specifications:

• Sheave Diameter: 40mm

• Max Rope Diameter: 9mm

• Material: Fibre-reinforced polymer cheeks, acetal sheave, stainless top

• Bearings: Acetal ball bearings for low-friction performance

• Configuration: Single block with swivel top head

• Applications: Mainsheet systems, halyards, control lines, vang blocks

• Features: Lightweight, strong, corrosion-resistant, race-proven design

Available now from Barton Marine NZ, your official supplier of Ronstan Orbit blocks and sailing hardware.