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Harken 2637 40mm Carbo Air Single Block with Swivel and Becket

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

2637
07/12/2036 11:15 PM
Sale Price

$32.99

In Stock (6)

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Product Details

The Harken 2637 Carbo Air® 40mm Single Block with Swivel and Becket is a compact, high-performance sailing block engineered for low-friction line control and reliable sail trimming. Part of Harken's popular Carbo Air® series, this block delivers outstanding strength-to-weight performance at an accessible price point.

Built from tough fiber-reinforced composite, the Carbo Air design is 30% lighter and offers a 60% higher working load than traditional Classic blocks. The open-air construction eliminates unnecessary material, while densely packed glass fibers in the nylon resin sideplates provide exceptional structural strength without the added weight of stainless steel straps.

Key Features:

  • Sheave diameter: 40mm (1-9/16 in.)
  • Overall length: 102mm (4 in.)
  • Maximum line diameter: 10mm (3/8 in.)
  • Maximum working load: 220 kg (485 lb.)
  • Breaking load: 735 kg (1,620 lb.)
  • Shackle pin diameter: 4mm (5/32 in.)
  • Weight: 48g (1.7 oz.)
  • Patented switch locks shackle in front or side position, or allows block to swivel freely to prevent line twist
  • Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for long-term weather protection
  • Becket provides a convenient attachment point for additional lines or blocks in multi-purchase systems
  • Free-running ball bearings roll on curved races for efficient load distribution

The Harken 2637 is ideal for main sheets, jib sheets, spinnaker sheets, and control lines on dinghies, sportboats, and larger keelboats. Its compact profile and high working load make it a versatile choice for a wide range of one-design and cruising applications.

Products specifications

Length

4

Type

Single

Diameter

3/8 Inch or 10 mm

Mount Type

Swivel Shackle

Ball Bearings

Plastic

Becket

Becket

Direction

Any

Integral Cleat

No Integral Cleat

Ratchet

Non Ratcheting

Safe Working Load

485 Pounds

Sheave Diameter

40 mm

Item was delivered on a pallet that appeared to have had a lot of care !

Quick and easy to order, fast shipping sealed the deal

The experience was good.

Fast shipping, excellent product! Ordered the new SPC upper control arm ball joints and my truck rides like new again, Thank you!

Easy to oreder - an excellent price.

Ordering went quick and easy! Hopefully delivery goes quickly also!

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