Harken 2642 40mm Carbo Air Double Block Fixed Sailing Block

The Harken 2642 40mm Carbo Air® Double Block (Fixed) is a high-performance sailing block engineered for low friction, exceptional strength, and minimal weight. Designed as a companion to the popular Harken Big Boat block line, this compact double block delivers very high working loads for safe, precise sail trimming on a wide range of vessels.

Built from UV-stabilized, high-strength resin composite sideplates, the Carbo Air® construction is consistently 30% lighter and 60% stronger than equivalent Classic blocks—making it the go-to choice for performance sailors and racers who demand reliable hardware without unnecessary weight. The fixed head configuration keeps the block stable and secure under load, ideal for applications where swivel movement is not required.

Key Features:

• Supports 2:1 or 3:1 purchase systems for versatile rigging configurations
• 40mm sheave diameter (1-9/16 in) for smooth, low-friction line travel
• Accepts lines up to 10mm (3/8 in) diameter
• Maximum working load: 970 lb (440 kg)
• Break load: 1,080 kg for a strong safety margin
• Fixed head design for stable, high-load applications
• UV-stabilized high-strength resin construction resists marine environment degradation
• Lightweight at just 80g (2.8 oz)
• Winner of the Dame Award and Sail Magazine's Freeman-Pittman Award for innovation

The Harken 2642 is well-suited for jib and mainsheet systems on high-performance dinghies and high-load control lines on small keelboats, offering the ideal combination of strength, weight savings, and durability for competitive and recreational sailors alike.

Specifications:

• Sheave Diameter: 40mm / 1-9/16 in
• Maximum Line Diameter: 10mm / 3/8 in
• Shackle Pin Diameter: 5mm / 3/16 in
• Maximum Working Load: 440 kg / 970 lb
• Break Load: 1,080 kg
• Length: 89mm / 3-1/2 in
• Weight: 80g / 2.8 oz