Harken 2640 40mm Carbo Air Triple Block with Swivel

The Harken 2640 40mm Carbo Air® Triple Block with Swivel is a lightweight, high-performance sailing block engineered for demanding sheet and control line applications. Designed as a compact companion to Harken's Big Boat block lineup, this triple block delivers an impressive working load of 1,455 lbs (660 kg) while keeping weight to just 4.6 oz (118 g)—making it an ideal choice for performance dinghies, sportboats, and small keelboats.

The Carbo Air design strips away unnecessary material without sacrificing strength, resulting in a block that is 30% lighter with a 60% higher working load than traditional Classic blocks. Ball bearings, sheave, and side plates are UV-stabilized with carbon black for lasting protection against sun and saltwater exposure.

Key Features:

• 40mm (1-9/16") sheave diameter accommodates lines up to 3/8" (10mm)
• Maximum working load: 1,455 lbs (660 kg) | Breaking load: 3,050 lbs (1,383 kg)
• Weight: 4.6 oz (118 g)
• Patented swivel shackle locks in front or side positions, or swivels freely to prevent line twisting
• Long glass fiber injection-molded construction for exceptional strength-to-weight ratio
• Torlon ball bearings running on curved races for low-friction, free-running performance
• UV-stabilized Delrin acetal sheave and side plates resist sun, salt, and time
• Shackle pin diameter: 3/16" (5 mm)
• Block length: 94 mm (3.7")

Ideal for main sheets, jib sheets, spinnaker sheets, and highly loaded control lines on high-performance dinghies and small keelboats. The triple sheave configuration provides mechanical advantage for smooth, easy trimming even in the most demanding wind conditions.