Harken 2603 57mm Carbo Double Block & Becket - Swivel

Harken 57mm Double Block — Swivel, Becket is a versatile, high-performance solution designed for efficient load handling in demanding sailing systems. Part of the trusted Carbo Air range, this block combines low-friction performance with impressive strength in a lightweight, compact design.

The double sheave configuration provides increased mechanical advantage, making it ideal for control lines and purchase systems where extra power is required. The swivel head ensures optimal alignment under load, reducing friction and improving trimming efficiency, while the integrated becket allows for additional purchase setups and flexible rigging options.

Built as a companion to Harken Big Boat blocks, the 57mm Carbo Air Double Block delivers reliable performance across a wide range of applications, from dinghies to small yachts, whether racing or cruising.

Specifications

Length: 142 mm / 5 5/8 in

Weight: 187 g / 6.6 oz

Sheave Diameter: 57 mm / 2 1/4 in

Maximum Line Diameter: 10 mm / 3/8 in

Maximum Working Load: 720 kg / 1584 lb

Breaking Load: 1500 kg / 3300 lb

Shackle Pin Diameter: 6 mm / 1/4 in

Key Features

• Double sheave design for increased mechanical advantage
• Low-friction Carbo Air construction for smooth, efficient performance
• Lightweight yet strong for high-load applications
• Swivel head for optimal alignment under load
• Integrated becket for flexible rigging and additional purchase systems
• High working load capacity for safe trimming
• Compact and durable design for demanding marine environments
• Ideal for control lines, vangs and purchase systems
• Suitable for dinghies, keelboats and small yachts
• Reliable performance for both racing and cruising