• 11%

Harken 2633 57mm Carbo Cheek Ratchamatic Block

You Save: £10.60 11%
Dispatched in 1-2 Days  Dispatched in 1-2 Days
Write Review

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. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes.

Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style. The Ratchamatic® cheek block mounts on either port or starboard.

For the ultimate system, mount a Ratchamatic® on the boom above a cockpit-mounted switchable ratchet to allow the mainsheet to run freely in light air and to double holding power in heavy air.

Use for:

  • Main/Jib Sheets

  • Asymmetric spinnakers


  • Sheave Ø (mm) - 57 mm

  • Length (mm) - 83 mm

  • Weight (g) - 89 g

  • Maximum line Ø (mm) - 10 mm

  • Fasteners (mm) - M4 mm

  • Maximum working load (kg) - 227 kg

  • Breaking load (kg) - 907 kg

  • Holding power w/180 degree wrap 50 lb (23 kg) - 10:1

  • Footnote - Includes fasteners and mounting pad.