Harken 75mm Black Magic Air Runner Block with Becket
Precision-engineered for high-load runner systems with integrated purchase options
The Harken 75mm Black Magic Air Runner Block with Becket is a specialised solution for adjustable runner systems on large performance yachts. Designed to accommodate lines up to 14mm and built for a Safe Working Load (SWL) of 2268kg, this block is ideal for scenarios where maximum control and minimal friction are critical. The addition of a becket provides a convenient and efficient way to add an extra purchase—increasing control and load distribution for dynamic runner loads.
Runner-Optimised Performance
Tailored for high-load, frequently adjusted runner systems, this block features a large 75mm sheave with Torlon® roller bearings housed in a precision-aligned centre cage. The result is ultra-low friction under load, even during rapid or repeated trimming. Delrin® side-load ball bearings enhance stability and help maintain alignment under lateral force.
Integrated Becket for Extra Purchase
The integrated becket at the base of the block allows a return lead to be easily anchored—enabling a simple 2:1 or 3:1 purchase system within the runner setup. This makes it especially suitable for large yachts and racing configurations where adjustable runners are under constant use and high tension.
Effortless Servicing, Durable Construction
Black Magic blocks are designed for sailors who value serviceability at sea. Corrosion-resistant fasteners allow for easy disassembly with a single hex wrench, and the internal bearing systems are captive, meaning no loose rollers or balls to lose during maintenance.
The block’s hardcoat anodised aluminium side plates are built to endure the harsh marine environment, retaining their signature black finish and performance characteristics over time.
Specifications:
- Sheave Diameter: 75mm
- Maximum Line Diameter: 14mm
- Safe Working Load (SWL): 2268kg
- Breaking Load: 4536kg
- Configuration: Runner Block with Becket
The Harken 75mm Black Magic Air Runner Block with Becket is the professional sailor’s choice for runner systems requiring precision control, modular purchase options, and low-friction performance under extreme loads. A proven performer for grand prix racing yachts and offshore campaigns.
Spécifications
| Length (mm) | 146 |
| Cordage recommandé – Ø Max (mm) | 14 |
| Ø réas (mm) | 75 |
| Ø axe (mm) | 12,7 |
| Charge de travail (kg) | 2268 |
| Charge de rupture (kg) | 4536 |
| Poids (g) | 318 |
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