Select Page

Current Murrays Sports information regarding COVID-19 virus outbreak, our policy and status at this time. UPDATED 05/07/2021 We are open and shipping.
Current COVID-19 Notice

Where are my parts?!?! Unfortunately we have been experiencing some issues with all domestic and international shipping carriers
Click here for more information

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