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Harken 2638 40mm Carbo Air Double Block with Swivel

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

2638
07/13/2036 4:39 AM
Sale Price

$79.69

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Product Details

The Harken 2638 40mm Carbo Air® Double Block with Swivel is a compact, low-friction sailing block engineered for high-load control line applications aboard dinghies, keelboats, and performance sailboats. Part of Harken's award-winning Carbo Air® series, this double block delivers a superior strength-to-weight ratio that racers and cruisers alike can depend on.

Compared to traditional Classic blocks, the Carbo Air® design is 30% lighter while offering a 60% higher working load — making it an exceptional upgrade for weight-conscious sailors who refuse to sacrifice strength. Torlon ball bearings run friction-free within a high-strength glass-filled nylon frame, ensuring smooth, effortless line handling under load.

The patented Harken U-Lock swivel system allows the shackle to lock in a front or side position for fixed applications, or release to spin freely to prevent line twist — a versatile feature for complex rigging setups. UV-stabilized carbon black materials protect the sheave, ball bearings, and sideplates from sun degradation for long-term reliability in harsh marine environments.

Key Features:

  • Sheave diameter: 1-9/16" (40 mm)
  • Overall length: 3-11/16" (94 mm)
  • Weight with shackle: 3.2 oz (86 g)
  • Maximum line diameter: 3/8" (10 mm)
  • Maximum working load: 970 lb (440 kg)
  • Breaking load: 2,380 lb (1,080 kg)
  • Shackle pin diameter: 3/16" (5 mm)
  • Torlon ball bearings for low-friction performance
  • Glass-filled nylon sideplates with load-carrying curved bearing races
  • Patented U-Lock swivel — locks front/side or spins freely
  • UV-stabilized with carbon black for maximum sun protection

Common Applications: Main and jib sheets, mainsheet fine-tune, outhauls, cunninghams, vangs, and general control lines. Frequently used as a mainsheet boom block on Etchells class sailboats.

The Harken 2638 is a companion to the Harken Black Magic block line and is ideal for high-performance dinghies and small keelboats where every gram matters. Backed by Harken's reputation for precision marine hardware, this block is built to perform race after race.

Products specifications

Type

Double

Diameter

3/8 Inch or 10 mm

Length

3 11/16 Inches

Mount Type

Swivel Shackle

Weight

0.20

Ball Bearings

Plastic

Becket

No Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

970 Pounds

Sheave Diameter

40 mm

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