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Harken 2646 40mm Carbo Block w/Cam Cleat and Becket

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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:

  • Main/jib sheets

  • Mainsheet fine-tune

  • Control lines

  • Vangs

  • Cunninghams

  • Outhauls


  • Sheave Ø (mm) - 40 mm

  • Length (mm) - 102 mm

  • Weight (g) - 122 g

  • Shackle pin Ø (mm) - 4 mm

  • Maximum line Ø (mm) - 6 mm

  • Maximum working load (kg) - 136 kg

  • Breaking load (kg) - 272 kg

  • Footnote - Maximum working loads and breaking loads for blocks based on cam strengths.