57 mm Zircon Triple Block — Becket

Harken 57 mm Zircon Triple Block — Becket

The Harken 57 mm Zircon Triple Block with Becket represents the pinnacle of small boat block technology, engineered to help trimmers match sail shapes to changing conditions with immediate, effortless response. At the heart of its performance are industrial ceramic ball bearings mounted inside precision caged races. Unlike conventional designs, the cages keep each bearing perfectly separated, preventing them from bunching together, making contact with one another, or creating friction that slows rotation. The result is a block with exceptionally low friction and the highest efficiency Harken has ever achieved in a small boat block.

The 57 mm sheave diameter accommodates rope up to 10 mm (3/8 in) in diameter, making it well suited for mainsheets, vangs, and other high-load control lines on dinghies and performance one-design boats. The integrated becket provides an attachment point for the standing end of a purchase system, enabling the block to serve as the anchor in a multi-part tackle arrangement. Despite its impressive strength — a maximum working load of 450 kg (990 lb) and a breaking load of 1,350 kg (2,970 lb) — the block weighs only 134 g (4.73 oz), keeping weight low and performance high.

Part of the Zircon family, which is available in 40 mm and 57 mm sheave sizes and in single and double configurations with or without beckets, this triple block is a versatile and durable choice for competitive sailors seeking the best possible mechanical advantage with minimal friction loss.

Key Features

• Industrial ceramic ball bearings in caged races for maximum efficiency and minimal friction
• 57 mm (2 1/4 in) sheave diameter accommodates rope up to 10 mm (3/8 in)
• Integrated becket for use as the anchor block in purchase systems
• Maximum working load: 450 kg (990 lb); breaking load: 1,350 kg (2,970 lb)
• Lightweight at just 134 g (4.73 oz) with a compact 95 mm (3 3/4 in) length
• Part of the Zircon family — the most efficient small boat block Harken has ever made