Specifications for Harken 75mm Black Magic Air Double Footblock
| Fastener Ø (mm) | 8 FH |
| Length (mm) | 111 |
| Cordage recommandé – Ø Max (mm) | 14 |
| Ø réas (mm) | 75 |
| Hauteur (mm) | 57 |
| Charge de travail (kg) | 1572 |
| Charge de rupture (kg) | 3143 |
| A (mm) | 11.5 |
| B (mm) | 28.5 |
| C (mm) | 70.5 |
| D (mm) | 21 |
| E (mm) | 77 |
| F (mm) | 110 |
| G (mm) | 17 |
| Poids (g) | 490 |
Harken 75mm Black Magic Air Double Footblock
Reliable, dual-line deflection with low friction and compact form
The Harken 75mm Black Magic Air Double Footblock provides a robust, low-profile solution for deflecting two independent high-load lines across the deck. Designed for use with 14mm lines, this block is rated for a Safe Working Load (SWL) of 1572kg and a Breaking Load of 3143kg, making it ideal for modern performance yachts and race boats.
Efficient Twin-Sheave Layout
Perfect for applications like twin headsail sheets, mainsheet returns, or halyard tails, this double footblock allows clean routing and smooth operation without the need for multiple separate blocks. The fixed base ensures secure, stable positioning under load.
⚠️ Note: As with all footblocks, the working load depends significantly on the line lead angle. Proper alignment and installation are key to safe operation.
Smooth, High-Load Performance
Each 75mm sheave spins on Torlon® roller bearings, housed within a centre cage that maintains roller separation and parallel alignment—minimising friction even at high loads. Delrin® side-load ball bearings absorb lateral forces and are fully captive to simplify maintenance.
Durable Construction for Marine Environments
The block features Hard Lube-anodised aluminium sheaves and sideplates for maximum UV resistance, corrosion protection, and a slick, long-lasting surface finish.
Clean and Secure Deck Mounting
The footblock mounts using concealed flathead fasteners (metric or imperial), delivering a smooth, snag-free finish that preserves deck safety and appearance.
Specifications:
- Sheave Diameter: 75mm (x2)
- Maximum Line Diameter: 14mm
- Safe Working Load (SWL): 1572kg
- Breaking Load: 3143kg
- Configuration: Double Footblock (no lockoff)
A clean, effective solution for multi-line deck routing, the Harken 75mm Black Magic Air Double Footblock offers professional-grade reliability, sleek integration, and performance trusted by offshore and inshore sailors alike.
Spécifications
| Fastener Ø (mm) | 8 FH |
| Length (mm) | 111 |
| Cordage recommandé – Ø Max (mm) | 14 |
| Ø réas (mm) | 75 |
| Hauteur (mm) | 57 |
| Charge de travail (kg) | 1572 |
| Charge de rupture (kg) | 3143 |
| A (mm) | 11.5 |
| B (mm) | 28.5 |
| C (mm) | 70.5 |
| D (mm) | 21 |
| E (mm) | 77 |
| F (mm) | 110 |
| G (mm) | 17 |
| Poids (g) | 490 |
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