Harken 2639 40mm Carbo Double Block - Swivel & Becket

Harken 40mm Double Block — Swivel, Becket is a compact, high-performance solution designed for efficient load handling and flexible rigging in a wide range of sailing applications. Part of the trusted Carbo Air range, this block delivers smooth, low-friction performance with impressive strength in a lightweight 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 changing loads, reducing friction and improving trimming efficiency, while the integrated becket allows for additional purchase setups and versatile rigging options.

Built as a companion to Harken Big Boat blocks, the 40mm Carbo Air Double Block offers excellent working loads for its size. Suitable for dinghies, keelboats and small yachts, it delivers reliable performance for both racing and cruising.

Specifications

Length: 110 mm / 4 5/16 in

Weight: 90 g / 3.4 oz

Sheave Diameter: 40 mm / 1 9/16 in

Maximum Line Diameter: 10 mm / 3/8 in

Maximum Working Load: 440 kg / 970 lb

Breaking Load: 1080 kg / 2380 lb

Shackle Pin Diameter: 5 mm / 3/16 in

Key Features

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