Harken 2639 40mm Carbo Air Double Block with Becket

The Harken 2639 40mm Carbo Air® Double Block with Becket is a high-performance sailing block engineered for lightweight strength and smooth, efficient line handling. Built around Harken's legendary Carbo Air® construction, this double block features a carbon fiber-reinforced body that dramatically reduces weight without sacrificing load capacity or durability — a critical advantage in performance racing and cruising applications.

The integrated becket provides an additional attachment point, making this block ideal for multi-purchase tackle systems such as vangs, cunninghams, and mainsheet systems where mechanical advantage and low friction are essential.

Key Features:

• Carbo Air® construction — carbon-reinforced sideplates deliver maximum strength-to-weight ratio
• 40mm sheave diameter — optimized for smooth lead and minimal friction on loaded lines
• Double sheave configuration — supports 2:1 or multi-purchase tackle arrangements
• Integrated becket — provides additional attachment point for complex rigging systems
• Stainless steel pin and axle — corrosion-resistant hardware for long-term marine performance
• Accepts rope and low-stretch line — compatible with Dyneema, Spectra, and conventional rope

Designed for racing sailors and performance cruisers who demand reliable, low-friction rigging hardware, the Harken 2639 integrates seamlessly into existing Harken 40mm Carbo Air® system components for a fully matched, optimized running rigging setup.