Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming.
Carbo AirBlocks® are 60% stronger and 30% lighter than our Classic blocks. Use the 40 mm Carbo for jib and mainsheet systems on high-performance dinghies and for loaded control lines on small keelboats.
The nylon-resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio. Sheaves spin on high-load ball bearings with fitted races for low-friction operation. Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection.
Use for:
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Main/jib sheets
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Mainsheet fine-tune
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Control lines
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Vangs
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Cunninghams
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Outhauls
Specifications:
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Sheave Ø (mm) – 40 mm
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Length (mm) – 102 mm
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Weight (g) – 122 g
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Shackle pin Ø (mm) – 4 mm
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Maximum line Ø (mm) – 6 mm
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Maximum working load (kg) – 136 kg
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Breaking load (kg) – 272 kg
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Footnote – Maximum working loads and breaking loads for blocks based on cam strengths.



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