Harken 75mm Black Magic Air Block with Becket
High-load single block with integrated becket for increased purchase efficiency
The Harken 75mm Black Magic Air Block with Becket combines the proven strength and efficiency of the Black Magic range with the added utility of a becket—allowing for the creation of powerful multi-purchase systems in a compact, lightweight form. Built for lines up to 14mm, this block features the standard Safe Working Load (SWL) of 2268kg and a Breaking Load of 4536kg, making it suitable for high-load applications in both racing and performance cruising environments.
Versatile Becket for Simplified Purchase Systems
The integrated becket at the base of the block allows for a 2:1 or 3:1 system by attaching a return line or dead end—ideal for vangs, mainsheets, runners, or downhaul systems. It provides added mechanical advantage with minimal added weight or complexity.
Low-Friction, High-Load Performance
The 75mm sheave rides on Torlon® roller bearings, guided by a centre cage that keeps rollers evenly spaced and aligned to deliver exceptional rotation under load. Delrin® ball bearings handle side loads and are fully captive—ensuring reliable performance and secure servicing.
Shackle Attachment with Adjustable Orientation
A robust shackle head provides flexible mounting, with a set screw that allows you to fix the shackle in place or leave it free to swivel. This feature is particularly helpful for avoiding line twist or aligning blocks in cascading systems.
Built for Longevity
The side plates and sheave are made from Hard Lube-anodised aluminium, offering superior resistance to UV damage, corrosion, and wear—perfect for long-term exposure in offshore environments.
Sailor-Friendly Maintenance
The block is assembled with corrosion-resistant fasteners and designed for quick disassembly using a single hex wrench. With no loose rollers or balls, servicing is straightforward and secure.
Specifications:
- Sheave Diameter: 75mm
- Maximum Line Diameter: 14mm
- Safe Working Load (SWL): 2268kg
- Breaking Load: 4536kg
- Configuration: Single Block with Becket and Shackle
Whether you're setting up a vang, downhaul, or mainsheet tackle, the Harken 75mm Black Magic Air Block with Becket gives you the power and flexibility to create high-performance purchase systems with minimal friction and maximum reliability.
Specifications
| Length (mm) | 157 |
| Recommended line - Max Ø (mm) | 14 |
| Sheave Ø (mm) | 75 |
| Pin Ø (mm) | 8 |
| SWL (kg) | 2268 |
| NBL (kg) | 4536 |
| Weight (g) | 363 |
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