Ronstan RF15312 15mm Triple Block with Becket – Series 15 Pulley NZ
The Ronstan RF15312 Series 15 Triple Block with Becket is a compact, high-performance pulley designed for multi-line purchase systems where efficiency and low friction are critical. Featuring three 15mm ball bearing sheaves and an integrated becket, it is ideal for advanced control setups such as vangs, cunninghams, cascades, and tweaker systems.
Constructed with precision-moulded acetal sheaves running on stainless steel ball bearings, the RF15312 delivers exceptionally smooth operation and minimal friction—essential for high-speed dinghy and performance sailing.
Its stainless steel cheeks and reinforced structure ensure strength and durability while maintaining a lightweight profile, making it one of the smallest and lightest triple blocks available in its class.
The addition of a becket (fixed tie-off point) allows direct attachment of control lines, simplifying rigging and enabling efficient multi-part purchase systems. Key Features
- Triple 15mm sheaves for multi-line purchase systems
- Integrated becket for line termination and cascades
- Ball bearing sheaves for ultra-low friction performance
- Compact, lightweight design for performance sailing
- Stainless steel cheeks for corrosion resistance
- Loop top with O-ring separates running line from attachment point
- Ideal for vangs, cunninghams, cascades, and shock cord systems Specifications
- Sheave Diameter: 15mm
- Number of Sheaves: 3 (triple block)
- Max Rope Diameter: ~5mm (typical Series 15)
- Construction: Acetal sheaves, stainless ball bearings, stainless cheeks
- Type: Triple block with becket and loop head
- Application: High-efficiency control systems Why Choose the Ronstan RF15312?
For New Zealand sailors, especially in dinghy and performance classes, efficient purchase systems are critical for sail control and responsiveness. The RF15312 allows you to build high mechanical advantage systems in a compact footprint, reducing effort while maintaining precision.
Compared to single or double blocks, the triple configuration enables:
- Higher purchase ratios (more power with less effort)
- Compact cascade systems
- Cleaner, more efficient rigging layouts
The integrated becket further simplifies setups, making this block ideal for advanced tuning systems on racing boats.