Harken 29mm Zircon Block
The Harken 29mm Zircon Block is the smallest member of Harken's premium Zircon range, engineered to deliver exceptionally low friction for high-performance dinghies, sportsboats and lightweight keelboats. Designed for sailors who demand maximum responsiveness from every control line, it features an advanced ceramic bearing system that offers noticeably smoother operation than conventional ball bearing blocks.
At the heart of every Zircon block are industrial ceramic ball bearings running within caged races. Unlike traditional loose bearing arrangements, the caged design keeps each bearing perfectly separated, preventing them from bunching together under load. This allows the sheave to rotate with remarkably low start-up friction, making the block highly responsive to even the smallest changes in sheet or control line load. The result is more precise sail trim, particularly in light winds where reducing friction has the greatest impact.
The ceramic bearings themselves are exceptionally strong, offering significantly greater resistance to compression than conventional stainless steel bearings. Combined with Harken's precision-engineered sheave and bearing race design, this creates a block that maintains its smooth-running characteristics over many seasons of demanding use while delivering the highest efficiency available in Harken's small block range.
With a Safe Working Load of 80kg and a maximum recommended rope diameter of 6mm, the 29mm Zircon Block is ideally suited to lightly loaded control lines where friction reduction is critical. Typical applications include cunninghams, outhauls, traveller controls, barber haulers, backstay cascades, vang purchases and other precision trimming systems where effortless adjustment improves sail control.
The compact soft-attachment head keeps overall weight to a minimum while allowing the block to align naturally with the direction of load, reducing side loading and maintaining maximum efficiency throughout the range of movement.
The 29mm Zircon family includes single, single with becket, double, double with becket, triple and triple with becket variants. Each shares the same advanced ceramic bearing technology, allowing sailors to build efficient purchase systems whilst maintaining consistent performance throughout the rig.
For racing sailors looking to minimise friction and maximise control, the Harken 29mm Zircon Block represents the highest-performance option in Harken's compact block range, delivering immediate response and outstanding efficiency exactly where it matters most.
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