Ronstan RF25109 20mm Ball Bearing Lashing Pulley | Lightweight Performance Block

The Ronstan RF25109 is an ultra-lightweight 20mm single lashing pulley designed for performance dinghy and skiff sailing. Featuring ball bearing sheaves for smooth, low-friction operation, and a low-profile lashing head, this block is ideal for applications where weight, size, and strength are critical.

Part of the Ronstan Series 25, the RF25109 is commonly used in vangs, cunninghams, control lines, and other areas where a minimalist block with high load capability is essential. It’s constructed with glass fibre-reinforced nylon cheeks and UV-resistant acetal sheaves, ensuring durability in demanding marine environments.

✅ Key Features

• Ronstan RF25109 – 20mm ball bearing lashing pulley

• Lightweight and compact for performance sailing

• Ball bearing sheave for smooth, low-friction operation

• Lashing head for flexible, space-saving attachment

• UV-stabilised acetal sheave and reinforced nylon cheeks

• Ideal for vang, cunningham, and control line setups

• High-load capacity with minimal weight

• Designed for dinghies, skiffs, and high-performance sailboats

Ronstan RF25109 Single ball bearing lashing pulley 20mm features:

• Sheave Ø 20mm
• Max. Rope Ø 6 mm
• M.W.L. 250 kg
• B. L. 550 kg
• Weight 9 g