40 mm Zircon Triple Block — Becket
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Harken 40 mm Zircon Triple Block — Becket
The Harken 40 mm Zircon Triple Block with Becket represents the pinnacle of small boat block technology, purpose-built to help trimmers match sail shapes to changing conditions immediately and with confidence. The Zircon series was developed around a fundamentally different bearing approach: industrial ceramic ball bearings mounted inside caged races. The cages keep each bearing separated from its neighbors so they cannot bunch together, make contact, or impede one another's rotation. The result is the most efficient small boat block Harken has ever produced.
With three 40 mm sheaves and an integrated becket, this block provides a versatile attachment point that dramatically expands rigging options for purchase systems, mainsheets, vang tackles, and other high-load applications on performance dinghies and one-design keelboats. The block accepts lines up to 8 mm in diameter and sustains a maximum working load of 345 kg (750 lb), while the breaking load of 1020 kg (2250 lb) provides a substantial safety margin under racing loads.
At just 70 g (2.47 oz) and 73 mm (2 7/8 in) in length, the Zircon Triple Block with Becket adds minimal weight and windage, which is critical in weight-sensitive one-design classes. The Zircon range is available in 40 mm and 57 mm sheave sizes, in single and double configurations, with or without beckets, giving sailors a complete system to outfit their entire deck.
Key Features
- Industrial ceramic ball bearings in caged races for maximum efficiency and minimal friction
- Triple 40 mm sheave configuration with integrated becket for versatile rigging setups
- Accepts lines up to 8 mm diameter
- Maximum working load: 345 kg (750 lb)
- Breaking load: 1020 kg (2250 lb)
- Ultralight at 70 g (2.47 oz) — ideal for weight-sensitive racing applications
- Compact 73 mm (2 7/8 in) length
- No swivel, cam, or ratchet — optimized for pure load-bearing efficiency
- Compatible with the full Zircon block family (40 mm and 57 mm sizes)
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