Harken 2659 40mm Carbo Air 90° Fixed Head Block Single Sheave

The Harken 2659 40mm Carbo Air® 90° Block is a fixed-head single-sheave sailing block engineered for high-performance applications where low friction, light weight, and reliable strength are essential. Part of Harken's renowned Carbo AirBlock® line, the 2659 delivers a compelling combination of durability and affordability for competitive and recreational sailors alike.

Carbo AirBlocks® are 60% stronger and 30% lighter than Harken's classic block designs. The 90° fixed-head configuration routes lines efficiently around corners on the boom or deck, making this block a popular choice for mainsheet systems on dinghies and loaded control lines on small keelboats.

Key Features:

• Low-friction sheave spins on high-load ball bearings with fitted races for smooth, efficient line handling
• Nylon-resin sideplates densely packed with long-glass fibers deliver a superior strength-to-weight ratio
• Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for long-term outdoor and marine durability
• 90° fixed-head design ideal for redirecting control lines on booms and deck-level fairleads
• Compact, small-profile construction handles high working loads without adding bulk

Specifications:

• Sheave Diameter: 40 mm (1-9/16 in)
• Block Length: 75 mm (2-15/16 in)
• Weight: 44 g (1.6 oz)
• Maximum Line Diameter: 10 mm (3/8 in)
• Maximum Working Load: 220 kg (485 lb)
• Breaking Load: 735 kg (1,620 lb)
• Head Type: Fixed 90°
• Manufacturer Part Number: 2659

The Harken 2659 is well-suited for Club 420, FJ, and similar dinghy classes as a mainsheet block on the boom, as well as small keelboat control line applications requiring a compact, high-strength redirect block.