Ronstan RF15171 15mm Upright Lead Block – Series 15 Pulley NZ

The Ronstan RF15171 Series 15 Upright Lead Block is a compact, high-efficiency pulley designed for leading control lines cleanly across decks and cockpit systems. With its low-profile fixed upright design, it provides a simple, reliable solution for guiding lines directly to cleats or clutches.

Featuring a 15mm UV-stabilised acetal sheave running on stainless steel ball bearings, the RF15171 delivers smooth, low-friction performance—ideal for high-speed dinghy sailing and light control systems.

Constructed with 316 stainless steel cheeks, this block offers excellent strength and corrosion resistance, making it well suited to New Zealand’s harsh marine conditions.

Commonly used for vangs, cunninghams, control lines, and shock cord systems, it is one of the most versatile small lead blocks available. Key Features

- Fixed upright lead design for straight line routing
- 15mm ball bearing sheave for smooth, low-friction operation
- Compact, low-profile block ideal for deck mounting
- 316 stainless steel cheeks for corrosion resistance
- UV-stabilised acetal sheave for durability
- Lightweight and efficient for dinghy and small yacht use
- Ideal for vangs, cunninghams, tweakers, and control lines Specifications

- Sheave Diameter: 15mm
- Max Rope Diameter: 5mm
- Maximum Working Load: 120kg
- Breaking Load: 550kg
- Weight: approx. 9g
- Mounting: 2 fastener holes
- Materials: Acetal sheave, stainless ball bearings, 316 stainless cheeks
- Type: Upright lead block Why Choose the Ronstan RF15171?

For New Zealand sailors, simple and efficient line routing is essential for performance and safety. The RF15171 provides a lightweight, reliable solution for fixed lead applications where line direction remains consistent.

Compared to pivoting lead blocks, the upright version offers a more compact, cost-effective option—perfect for dinghies, trailer yachts, and basic control systems operating in coastal conditions.