Harken 75mm Black Magic Air Standup Block
High-performance reliability for mainsheet, halyard, or spinnaker systems
The Harken 75mm Black Magic Air Standup Block is a premium solution for high-load sail control applications. Designed for lines up to 14mm and built to handle a Safe Working Load (SWL) of 2268kg, this block is a favourite among offshore racers and performance cruisers alike. It’s ideally suited for heavily loaded mainsheet, halyard, runner, and spinnaker systems.
Engineered for Smooth Power Transmission
This block uses Torlon® roller bearings housed within a precision-aligned centre cage to reduce friction under extreme loads. Delrin® ball bearings carry side loads, and both systems are fully captive—ensuring there are no loose parts during service or disassembly.
Quick and Easy Maintenance
Harken’s practical design philosophy shines through: fasteners—not rivets—allow the block to be fully disassembled with a single hex wrench. Fewer components mean faster maintenance, whether ashore or on passage.
Rugged and Long-Lasting
The hardcoat anodised aluminium side plates are highly durable and resist corrosion, maintaining their sleek black finish over time. This construction ensures high load capacity while minimising weight.
Versatile Mounting, Secure Fit
This standup block includes a padeye and shares the base dimensions and hole spacing with the Harken 627 padeye—ensuring compatibility with a wide range of installations.
⚠️ Important Note: Maximum working load will decrease at varying angles. Please consult Harken’s load angle guidelines to ensure optimal usage and safety margins.
Specifications:
- Sheave Diameter: 75mm
- Maximum Line Diameter: 14mm
- Safe Working Load (SWL): 2268kg
- Breaking Load: 4536kg
- Configuration: Standup Block
- Includes: Padeye (uses Harken 627 hole spacing & base dimensions)
Built for elite-level control and endurance, the Harken 75mm Black Magic Air Standup Block delivers uncompromising performance in the most demanding sail control applications.
Specifications
| Length (mm) | 151 |
| Recommended line - Max Ø (mm) | 14 |
| Sheave Ø (mm) | 75 |
| SWL (kg) | 2268 |
| NBL (kg) | 4536 |
| Weight (g) | 442 |
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