The Ronstan RF186 Series 30 Utility Fiddle Block is a compact, lightweight, and highly versatile sailing pulley designed for efficient line control across a wide range of applications. Featuring a dual-sheave (fiddle) configuration with a tube rivet head, this block is ideal for systems requiring increased purchase and flexible attachment options.

Built with UV-stabilised acetal sheaves and corrosion-resistant stainless steel cheeks, the RF186 delivers smooth operation and long-lasting performance in New Zealand’s harsh marine conditions. Its hollow tube rivet head allows easy attachment using screws, shackles, or lashings, and can also function as a becket for added mechanical advantage.

Designed for reliability and minimal maintenance, this block is widely used in vang, cunningham, trapeze retriever systems, and general control line setups on dinghies and small yachts.

Key Features

• Fiddle block design (30mm + 40mm sheaves) for increased purchase
• Durable stainless steel cheeks for corrosion resistance
• UV-stabilised acetal sheaves for smooth, low-friction performance
• Tube rivet head allows versatile mounting or becket use
• Lightweight, maintenance-free construction
• Ideal for vang, cunningham, trapeze and control systems
• Trusted Ronstan Series 30 marine hardware

Specifications

• Sheave Sizes: 30mm & 40mm
• Max Rope Diameter: 8mm
• Maximum Working Load: 300kg
• Breaking Load: 600kg
• Weight: Approx. 50g
• Construction: Stainless steel cheeks, acetal sheaves

Why Choose the Ronstan RF186? 

For New Zealand sailors, versatility and durability are essential. The RF186 offers a simple, reliable solution for multi-purpose rigging setups, providing smooth line handling and flexible installation options.

Its compact size and robust construction make it perfect for both recreational sailors and competitive racers needing dependable control hardware in coastal and offshore conditions.