cheek block with ratchamatic function
Harken Harken sailboat hardware
  • cheek block with ratchamatic function

Harken Carbo Ratchamatic Cheek Blocks

Harken Carbo cheek block 2633 has a 2-1/4 inch (57 mm) sheave, with load sensing Ratchamatic 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. Holding power of 57 mm is as high as 10:1. The 75 mm up to 15:1.

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 ensure double holding power in heavy air.

$95.54 / ea
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Tech Spec Product Info User Generated Content



2633 Block

Sheave diameter  2-1/4 inch 
Length  3-1/4 inch 
Weight  3.1 oz 
Max. line diameter  3/8 inch 
Shackle pin diameter  n/a 
Safe Working Load  500 lbs 
Breaking Strength  2000 lbs 
Holding Power w/ 180 deg Wrap 50 lb  10:1 


  • Use for main and jib sheets and asymmetrical spinnakers.

  • Nylon resin sideplates are densely packed with long glass fibers for a compact block with a high strength-to-weight ratio.
  • Eight facets hold line securely
  • Free-rolling ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection
  • Includes RH fasteners and mounting pad
  • Machined aluminum sheaves are Hardkote anodized for strength and corrosion resistance.


BRAND: Harken
Type: Blocks and Sheaves
5.0 1

perhaps a mistake?


Price is higher than the harken catalog. Perhaps there's a mistake?ps I don't expect to see this review published.



Harken Carbo Ratchamatic Cheek Blocks



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