Harken 340 29mm Carbo Block - Swivel

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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.

The compact 29 mm Carbo is extremely strong. Use our miniature Carbo as a mainsheet block on small dinghies such as the Optimist, or for low-friction control blocks on any size boat.

Use for:

  • Outhauls

  • Cunninghams

  • Vangs

  • Traveler controls

  • Barberhaulers

  • Flag halyards


  • Sheave Ø (mm) - 29 mm

  • Length (mm) - 66 mm

  • Weight (g) - 26 g

  • Shackle pin Ø (mm) - 4 mm

  • Maximum line Ø (mm) - 8 mm

  • Maximum working load (kg) - 150 kg

  • Breaking load (kg) - 454 kg

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