Harken 57 mm Double Ratchamatic® Carbo Air® Block — Swivel

The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless. Use the 2634 with a 402 or 403 swivel arm for a versatile two-speed mainsheet system.


  • Breaking load (kg) 851
  • Length (mm) 116
  • Maximum line Ø (mm) 10
  • Maximum working load (kg) 340
  • Shackle pin Ø (mm) 6
  • Sheave Ø (mm) 57
  • Weight (g) 204

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