Ronstan RF15141 15mm Stand-Up Block – Series 15 Pulley NZ
The Ronstan RF15141 Series 15 Stand-Up Block is a compact, high-performance pulley designed for precision control line handling on dinghies and small yachts. Featuring a stand-up base with spring and saddle, it keeps the block upright and correctly aligned—improving rope handling and reducing friction.
Built with a 15mm UV-stabilised acetal sheave and stainless steel ball bearings, this block delivers exceptionally smooth operation under load, making it ideal for fast, responsive sailing systems.
The 316 stainless steel cheeks provide strength and corrosion resistance, ensuring durability in New Zealand’s demanding marine environment.
Designed as one of the smallest and lightest ball bearing blocks available, the RF15141 is widely used in vangs, cunninghams, tweakers, and shock cord systems, where weight and efficiency are critical. Key Features
- Stand-up base with spring keeps block upright and aligned
- 15mm ball bearing sheave for ultra-low friction performance
- Compact, ultra-lightweight design (~10g)
- UV-stabilised acetal sheave for durability
- 316 stainless steel cheeks for corrosion resistance
- Smooth operation for high-speed control systems
- Ideal for dinghies, skiffs, and performance boats Specifications
- Sheave Diameter: 15mm
- Max Rope Diameter: 5mm
- Maximum Working Load: 120kg
- Breaking Load: 550kg
- Weight: approx. 10g
- Materials: Acetal sheave, stainless ball bearings, 316 stainless cheeks
- Mounting: Stand-up base with spring and saddle
- Type: Stand-up pulley block Why Choose the Ronstan RF15141?
For New Zealand sailors, maintaining low friction and clean line handling is essential—especially in high-performance dinghy and trailer yacht setups. The RF15141 ensures lines remain elevated, aligned, and easy to access, reducing wear and improving efficiency.
Compared to fixed cheek or lead blocks, the stand-up design offers:
- Better line entry angle
- Reduced deck clutter and snagging
- Faster, smoother control adjustments under load
This makes it ideal for dynamic control systems where performance matters.