Harken 29 mm Carbo Double Swivel Block 342

Harken 29 mm Carbo Double Swivel Block (342) – Power and Precision in a Compact Design

The Harken 29 mm Carbo Double Swivel Block (342) is a high-performance dual‑sheave pulley built for advanced sailboat control systems. Designed for vangs, halyard leads, sheet systems, or multi‑part tackles on dinghies, small cruisers, and racing boats, this block perfectly balances mechanical advantage, alignment flexibility, and lightweight construction.

Combining materials and design innovation:

• Carbon® side cheeks offer exceptional rigidity with low weight

• UV‑stable Delrin® 29 mm sheaves ride on stainless steel ball bearings for ultra-smooth rotation

• Dual 360° stainless steel swivel head ensures optimal line alignment under load

• Supports line up to 8 mm

• Working load ~300 kg, breaking strength around 975 kg

• Weighs approximately 60 g

This dual‑swivel block delivers high mechanical advantage and precise alignment, while keeping weight to a minimum—ideal for sailors demanding top-tier performance in compact spaces.