29 mm Zircon Double Block — Becket
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Harken 29 mm Zircon Double Block — Becket
The Harken 29 mm Zircon Double Block with Becket expands the Zircon line to eighteen models, bringing a smaller sheave diameter to sailors who require multi-part purchase systems on control lines. Zircon is not an all-purpose alternative—no block is—but these 29 mm sizes make it appropriate where high-ratio purchases are needed. The block reacts immediately under load, so when pressure gets light and you ease a 24:1 Cunningham rigged under the deck or want to let the jib lead forward for more power through the chop, you will get the response you need.
Featuring two 29 mm ceramic ball-bearing sheaves and an integrated becket, this block is built for performance sailors who demand maximum efficiency and responsiveness in their control line systems. The zirconium ceramic bearings minimize drag, and the lightweight yet durable construction ensures smooth operation and long-lasting reliability across a wide range of conditions—even under light and dynamic loads. At just 22.5 g and 54 mm in length, it fits comfortably into compact deck layouts without sacrificing load capacity.
Key Features
- Two 29 mm ceramic ball-bearing sheaves for low-friction line handling
- Integrated becket for use in multi-part purchase systems
- Lightweight design at 22.5 g / 0.79 oz
- Accepts lines up to 6 mm / 1/4 in diameter
- Maximum working load of 160 kg / 350 lb
- Breaking load of 480 kg / 1050 lb
- Overall length of 54 mm / 2 1/8 in
- Ideal for underdeck cunningham 24:1, adjustable jib systems, and other multi-purchase control line applications
- Suited for high-performance dinghies and sportboats
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