Harken carbo ratchamatic block
Harken Harken sailboat hardware
  • Harken carbo ratchamatic block

Harken Single Carbo Ratchamatic Blocks

Harken single Carbo block 2625 with 2-1/4 inch (57 mm) sheave and Ratchmatic gearing. Carbo Ratchamatic is a load sensing ratchet block design thatt 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.

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Tech Spec Product Info User Generated Content


  • Use for main and jib sheets and asymmetrical spinnakers
  • Adjustable ratchet engagement adapts block to a variety of applications
  • Ratchet engages automatically
  • Eight faceted Hardkot-anodized aluminum sheave holds line securely
  • Durable stainless steel pawl for high load conditions




2625 Block

Sheave diameter  2-1/4 inch 
Length  4-1/16 inch 
Weight  3.7 oz 
Max. line diameter  3/8 inch 
Shackle pin diameter  3/16 inch 
Safe Working Load  500 lbs 
Breaking Strength  2000 lbs 
Holding Power w/ 180 deg Wrap 50 lb  10:1 
BRAND: Harken
Type: Blocks and Sheaves
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