Harken 75mm Black Magic Air Double Block
High-strength double block for powerful sail control systems
The Harken 75mm Black Magic Air Double Block is engineered for demanding applications requiring high-load handling and dual-line control in a compact, efficient format. With a Safe Working Load (SWL) of 3402kg and a Breaking Load of 6804kg, this block is built for serious offshore racers and performance cruisers who need dependable power transfer and low friction in high-tension systems.
Double Sheaves for High-Efficiency Multi-Purchase Systems
Featuring two independent 75mm sheaves, this block is ideal for use in mainsheet tackles, vang cascades, multi-part backstay or runner systems, and other applications requiring compact and efficient load distribution across multiple lines.
Shackle Attachment with Adjustable Orientation
Fitted with a robust shackle connection, the block includes a set screw that allows the shackle to be either locked in a fixed position or left free to swivel, depending on your rigging setup. This provides essential flexibility for avoiding line twist and ensuring smooth operation, even in complex systems.
Advanced Bearing Technology
Each sheave rotates on Torlon® roller bearings supported by a centre cage, which keeps the bearings aligned and evenly spaced—minimising friction under extreme loads. Delrin® ball bearings are used to manage side loads, and all components are fully captive, eliminating the risk of parts loss during service.
Marine-Grade Durability
The block is constructed with Hard Lube-anodised aluminium sideplates and sheaves, offering maximum resistance to UV, corrosion, and abrasion. This robust finish ensures long-term performance in the harshest saltwater conditions while maintaining a sleek, black aesthetic.
Serviceable at Sea
Like all Black Magic Air blocks, this model is designed for quick and easy maintenance. Fasteners allow simple disassembly using a single hex wrench, with no loose balls or rollers to worry about during service.
Specifications:
- Sheave Diameter: 75mm (x2)
- Maximum Line Diameter: 14mm
- Safe Working Load (SWL): 3402kg
- Breaking Load: 6804kg
- Configuration: Double Block with Shackle
Whether you're optimising a vang, mainsheet system, or backstay tackle, the Harken 75mm Black Magic Air Double Block delivers the strength, efficiency, and adaptability required by today’s high-performance sailing programmes.
Spécifications
| Length (mm) | 134 |
| Cordage recommandé – Ø Max (mm) | 14 |
| Ø réas (mm) | 75 |
| Ø axe (mm) | 10 |
| Charge de travail (kg) | 3402 |
| Charge de rupture (kg) | 6804 |
| Poids (g) | 721 |
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