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Harken Block 57mm Carbo Double with Ratchamatic & Swivel

$274.75 each

SKU: 28-2634 Categories: , ,

Product Description

The 57mm Harken 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.

The load-sensing Carbo Ratchamatic® has a ratchet that instantly engages when a predetermined load is reached. When unloaded, the ratchet pawl seamlessly disengages to allow the sheet to run out instantly during mark roundings and jibes. The Ratchamatic allows lightly-loaded sheets to run freely in both directions for fingertip control. The preset load threshold can be fine-tuned with an Allen wrench to suit different applications, sailing styles, and body types.


  • Sheave Diameter: 2-1/4"
  • Length: 4-9/16"
  • Weight: 7.2 oz
  • Shackle Pin Diameter: 1/4"
  • Maximum Line Diameter: 3/8"
  • Maximum Working Load: 750 lb
  • Breaking Load: 1875 lb
  • Holding power with 180 degree wrap 50 lb (23 kg): 10:1

Additional information

Weight 0.5 lbs
Dimensions 4 × 3 × 2 in