Harken 75mm Black Magic Air Block – Swivel
High-strength single block for versatile high-load applications
The Harken 75mm Black Magic Air Block – Swivel is the flagship single block of Harken’s Black Magic range, delivering uncompromising strength, low-friction efficiency, and durable construction for 14mm lines in the most demanding sailing environments. With a Safe Working Load (SWL) of 2268kg and a Breaking Load of 4536kg, this block is a trusted choice for offshore racers and serious cruisers alike.
Versatile and Robust
Ideal for use in mainsheet systems, halyards, runners, and control lines, this single block provides clean, efficient power transmission with a shackle head that supports both dynamic and fixed installations.
Swivel or Fixed – Your Choice
A key feature of this model is its adjustable shackle orientation. A built-in set screw allows you to either lock the shackle head in place or leave it free to swivel, depending on your system’s requirements. This helps avoid line twist and improves alignment across a variety of rigging setups.
Superior Bearing Technology
The 75mm sheave rotates on Torlon® roller bearings, guided by a centre cage that maintains even spacing and alignment—ensuring minimal friction under load. Delrin® side-load ball bearings absorb lateral forces and are fully captive for easy servicing.
Built to Endure
Constructed from Hard Lube-anodised aluminium, the sheave and side plates provide outstanding resistance to UV exposure, salt corrosion, and wear, while maintaining the sleek, all-black aesthetic that defines the Black Magic series.
Easy Maintenance
This block is designed with simplicity and longevity in mind. Corrosion-resistant fasteners enable quick disassembly using a single hex wrench, and the captive bearing system eliminates the risk of loose components during cleaning or inspection.
Specifications:
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Sheave Diameter: 75mm
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Maximum Line Diameter: 14mm
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Safe Working Load (SWL): 2268kg
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Breaking Load: 4536kg
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Configuration: Single Block with Swivel Shackle
Whether used as part of a mainsheet tackle, halyard deflection, or control system, the Harken 75mm Black Magic Air Block – Swivel offers the performance, adaptability, and reliability required by professional sailors and serious cruising crews alike.
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