Harken 57mm Carbo Air® Double Block allows a 2:1 or 3:1 purchasing system.
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.
High strength-to-weight ratio block
Harken’s most innovative blocks
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): 1584 lb. (720 kg)
Breaking Load: 3300 lb. (1500 kg)
Weight: 6.3 oz. (178 g)
Length: 4 3/4" (121 mm)
7/16 Inch or 11 mm
No Integral Cleat
4 3/4 Inches
Safe Working Load
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