Harken 2604 57mm Carbo Triple Block - Swivel

Harken 57mm Triple Block — Swivel is a high-load, high-efficiency solution designed for powerful purchase systems in demanding sailing applications. Part of the proven Carbo Air range, this triple block delivers exceptional strength, smooth operation and reliability in a compact, lightweight design.

Featuring three sheaves for maximum mechanical advantage, this block is ideal for control systems requiring increased power and fine-tuned adjustment. The swivel head allows the block to align naturally under load, reducing friction and ensuring efficient trimming in dynamic conditions.

Built as a companion to Harken Big Boat blocks, the 57mm Carbo Air Triple Block offers outstanding working loads while remaining easy to handle. Perfect for vangs, mainsheet systems and other high-load control setups on dinghies, keelboats and small yachts.

Specifications

Length: 121 mm / 4 3/4 in

Weight: 255 g / 9 oz

Sheave Diameter: 57 mm / 2 1/4 in

Maximum Line Diameter: 10 mm / 3/8 in

Maximum Working Load: 1080 kg / 2380 lb

Breaking Load: 2270 kg / 5000 lb

Shackle Pin Diameter: 6 mm / 1/4 in

Key Features

• Triple sheave design for maximum mechanical advantage
• Low-friction Carbo Air construction for smooth, efficient performance
• High working load capacity for demanding control systems
• Swivel head for optimal alignment under load
• Lightweight yet strong for performance sailing applications
• Compact and durable construction for harsh marine environments
• Ideal for vangs, mainsheet systems and high-load purchase setups
• Suitable for dinghies, keelboats and small yachts
• Reliable performance for both racing and cruising