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Harken 2643 40mm Carbo Air Double Block with Becket Fixed Shackle

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

2643
07/12/2036 11:05 PM
Sale Price

$73.68

In Stock (5)

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Product Details

The Harken 2643 40mm Carbo Air® Double Block with Becket is a high-performance sailing block engineered for low friction, exceptional strength, and lightweight construction. Featuring a fixed shackle mount and an integrated becket, this double-sheave block enables efficient 2:1 or 3:1 purchase systems for mainsheet, jib sheet, and spinnaker sheet applications on sportboats, dinghies, and small keelboats.

Part of Harken's acclaimed Carbo Air® line, the 2643 is consistently 30% lighter and delivers 60% higher working loads than equivalent Classic blocks — making it an ideal upgrade for performance-minded sailors who demand more from their rigging without adding unnecessary weight.

Key Features:

  • Open Air Block design eliminates excess material and reduces overall weight
  • UV-stabilized ball bearings, sheave, and side plates with carbon black treatment for maximum protection against sun, salt, and weathering
  • Free-running ball bearings roll on curved races for smooth, efficient load distribution
  • Fixed shackle with patented switch locks in front or side positions, or allows the block to swivel to prevent line twist
  • Fiber-reinforced composite construction provides a superior strength-to-weight ratio
  • Becket included for attaching the standing end of a purchase system
  • Compact, small-footprint design suited for high-performance dinghy and sportboat rigging
  • Compatible with small-diameter lines favored by racers

The Harken 2643 is an excellent choice for jib and mainsheet systems on high-performance dinghies and control lines on small keelboats. Its proven Carbo Air® construction has earned both the Dame Award and Sail Magazine's Freeman-Pittman Award for innovation in sailing hardware.

Products specifications

Type

Double

Diameter

3/8 Inch or 10 mm

Length

4 3/16 Inches

Mount Type

Side Shackle

Ball Bearings

Plastic

Becket

Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

970 Pounds

Sheave Diameter

40 mm

Easy to look up and order

Top notch business prompt on time

Perfect!

Fast shipping easy to order no problem

Ordered Enkei brand hubcentric rings, company sends Coyote brand hubcentric rings. Will they work, yes but it's a classic bait-n-switch sales tactic. Wish THMotorsports was upfront & honest with their customers.

all was great!

Everything was seamless and smooth. Zero issues.

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