Ronstan RF15151A 15mm Cheek Block Single Mount – Series 15 Pulley NZ
The Ronstan RF15151A Series 15 Single Cheek Block is an ultra-compact, high-performance pulley designed for tight installation spaces and efficient line redirection. Featuring a single mounting point, it offers a simple and lightweight solution for leading control lines on dinghies, trailer yachts, and small keelboats.
Built with a 15mm UV-stabilised acetal sheave running on stainless steel ball bearings, this block delivers smooth, low-friction performance—ideal for fast and responsive sail control systems.
Its 316 stainless steel cheeks provide excellent corrosion resistance and durability, making it well suited to New Zealand’s demanding marine conditions.
The single-hole cheek mounting design allows quick installation directly onto masts, booms, or decks, making it perfect for fairleads, deflectors, and compact rigging setups where space is limited. Key Features
- Single mounting cheek block for compact installations
- 15mm ball bearing sheave for smooth, low-friction performance
- Smallest and lightest Ronstan ball bearing block design
- 316 stainless steel cheeks for corrosion resistance
- UV-stabilised acetal sheave for durability in marine environments
- Ideal for tight spaces and lightweight rigging systems
- Suitable for control lines, vangs, cunninghams, and shock cords Specifications
- Sheave Diameter: 15mm
- Max Rope Diameter: 5mm
- Maximum Working Load: approx. 120kg
- Breaking Load: approx. 360kg
- Weight: approx. 9g
- Bearing Type: Stainless steel ball bearings
- Materials: Acetal sheave, 316 stainless steel cheeks
- Mounting Type: Single-hole cheek mount Why Choose the Ronstan RF15151A?
For New Zealand sailors, efficient use of space and weight is critical—especially on dinghies and performance setups. The RF15151A offers a minimalist, high-efficiency solution for routing lines in confined areas.
Compared to multi-bolt cheek blocks, the single mounting design provides faster installation and reduced weight, making it ideal for light-duty control systems, shock cord setups, and compact rigging layouts in coastal conditions.