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

Manufacturer

Harken

<h3>About Harken: Performance Marine Hardware Since 1967</h3><p><strong>Harken</strong> is one of the most recognized names in performance marine hardware, with a legacy stretching back to 1967. <a href="/14853-harken">Harken</a> was founded in a 60-foot trailer by brothers Peter Harken and Olaf Harken, who set out to engineer better sailboat hardware than anything the market had to offer. Their early breakthrough — the plastic recirculating ball bearing block — redefined how sailors managed lines under load and launched a brand that would go on to dominate competitive sailing at the highest levels.</p><p>Headquartered in Pewaukee, Wisconsin, and with a major manufacturing facility in Limido Comasco, Italy, Harken operates as an employee-owned company with distribution spanning 48 countries. From club racing dinghies to grand prix offshore programs, Harken hardware has been aboard winning boats for decades — making its Olympic and America's Cup debuts in 1976 and 1977, respectively.</p><h3>A Full Range of Marine Hardware</h3><p>Harken's product lineup is broad by design. The company works hard to be the technological leader in sailboat blocks, deck hardware, winches, and hydraulics, as well as safety and rescue equipment and services. Their marine catalog includes small boat and big boat blocks, travelers and genoa leads, mainsail and headsail handling systems, winches, hydraulics, mooring solutions, and a robust line of spare parts and accessories.</p><p>At the core of it all are Harken's renowned <a href="/14853-harken-pulleys-blocks-200822">Pulleys &amp; Blocks</a> — the product category that started it all. Whether you're outfitting a high-tech racing dinghy or a bluewater cruising yacht, Harken blocks are engineered for high-load capacity, corrosion resistance, and the smoothest possible operation. The lineup spans sheave sizes from 16 mm all the way to 75 mm, with single, double, triple, fiddle, and soft-attach configurations to cover virtually every application on deck.</p><p>Beyond sailing, Harken also produces a dedicated line of sportfishing <a href="/14853-harken-pulleys-blocks-202394">Pulleys &amp; Blocks</a> engineered for the unique demands of offshore fishing. These compact, high-load pulleys are built for outrigger systems, dredge rigging, and heavy-duty line management — bringing the same patented bearing technology that excels on race courses to the rigors of the fishing cockpit.</p><h3>Why Sailors Trust Harken</h3><p>What sets Harken apart is a relentless commitment to engineering. Each product category is developed with input from top sailors, sailmakers, and boat designers — and the results speak for themselves on race courses worldwide. Harken hardware is a consistent fixture on America's Cup campaigns, Volvo Ocean Race fleets, Olympic classes, and everything in between. For cruisers, that race-proven performance translates into gear that is more reliable, longer-lasting, and more responsive than the alternatives.</p><ul><li>Employee-owned company with decades of marine engineering expertise</li><li>Manufacturing in the USA and Italy, with global distribution in 48 countries</li><li>Patented bearing systems engineered for high loads and minimal friction</li><li>Product lines covering everything from small dinghies to superyachts</li><li>Trusted at the Olympic Games and America's Cup since the 1970s</li></ul>

Part Number

2659
07/13/2036 10:43 AM
Sale Price

$31.59

In Stock (10+)

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Product Details

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.

Products specifications

Type

Single

Diameter

3/8 Inch or 10 mm

Length

2 15/16 Inches

Mount Type

Side Shackle

Weight

0.10

Ball Bearings

Plastic

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

485 Pounds

Sheave Diameter

40 mm

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