57mm Carbo Air® Single Block
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HARKEN57mm Carbo Air® Single Block


In stock online.
Model # 200027 | Mfg # 2600UPC # 97653076056
57mm Carbo Air® Single Block


4.8 Stars


57mm Carbo Air® Single Block

Name Value
Ball Bearings Plastic
Becket No Becket
Diameter 3/8 Inch or 10 mm
Direction Any
Integral Cleat No Integral Cleat
Length 4 5/16 Inches
Mount Type Swivel Shackle
Ratchet Non Ratcheting
Safe Working Load 792 Pounds
Sheave Diameter 57 mm
Type Single
Weight 3.1 Ounces

Product Overview

The Harken 57mm Carbo Air® Single Block is a ball bearing general purpose workhorse. 

Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and economical. Consistently 30% lighter and 60% stronger than equivalent Classic blocks. The sideplates are UV-stabilized, high-strength resin and designed for small-diameter lines favored by racers. Good for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats.

Recipient of both the Dame Award and Sail Magazine’s Freeman-Pittman Award for innovation, this innovative line of blocks turns fiber-reinforced composite construction into a reliable strength-to-weight ratio you can depend on. Companions to the popular Harken Black Magic block line, these small, compact blocks work well with very high working loads for easy trimming.

Key Features 

  • High strength-to-weight ratio general-purpose block
  • 30% lighter, 60% stronger than equivalent conventional blocks
  • Smaller block for jib and mainsheet systems on high-performance dinghies 
  • Use for high-load control lines on small keelboats
  • Stainless steel swivel shackle
  • Sheave Diameter: 2 1/4" (57 mm)
  • Max. Line Diameter: 3/8" (10 mm)
  • Max. Working Load (MWL): 792 lb. (359 kg) 
  • Breaking Load: 2380 lb. (1079 kg)
  • Weight: 3.1 oz. (87 g)
  • Length: 4 5/16" (110 mm)


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