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Harken 57 mm Carbo Double Ratchamatic Block

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Harken 57 mm Carbo Double Ratchamatic Block
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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.


This fitting is commonly used and/or recommended for the following one design sailboat applications:

  • Star Mainsheet Block (x1)


Ratchet Block
Fiddle Block
57 mm

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