Harken 29 mm Carbo Double Swivel w/ Becket 343

Harken 29 mm Carbo Double Swivel Block with Becket (343) – Dual-Sheave Power with 360° Rotation

The Harken 29 mm Carbo Double Swivel Block with Becket (343) combines two 29 mm Delrin® sheaves, dual 360° stainless steel swivel heads, and an integrated becket—creating the ultimate high-performance pulley for multi-part purchase systems on dinghies, racing boats, and light cruisers. This block is expertly engineered for applications such as vangs, halyard and sheet systems, and complex rigging setups requiring precise alignment and strong purchase.

Highlighted features:

Carbon® side cheeks for exceptional strength and minimal weight

Dual UV-stable Delrin® 29 mm sheaves on stainless steel ball bearings for low-friction performance

Dual stainless steel swivel heads to eliminate line twist and maintain alignment under load

Integrated becket enables clean and efficient 2:1 or greater tackle configurations

Compatible with line up to 8 mm

Working load ~300 kg, breaking strength ~975 kg

Lightweight at around 80 g

Perfect for sailors who demand maximum mechanical advantage, full swivel flexibility, and lightweight, high-strength performance, the Harken 343 is a top-tier choice for advanced rigging systems.