Harken carbo cheek block
Harken Harken sailboat hardware
  • Harken carbo cheek block

Harken 40mm Carbo Cheek Block

Harken 2644 single cheeck Carbo block mounts flat in plane with decks for changing angles on control lines. Size is appropriate for jib and mainsheet systems on high-performance dighies and for loaded control lines on small keelboats.

Small 40mm Carbo AirBlocks have 1-9/16 inch diameter sheaves. The shackle swivels to prevent line twist. AirBlocks are 60 percent stronger and 30 percent lighter than Harken Classic blocks.

Use for mainsheets, jibsheets, mainsheet fine tune, control lines, vangs, cunninghams and outhauls.

IN STOCK - Available for pickup
$29.28 / ea
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Tech Spec Product Info User Generated Content


  • Nylon-resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio.
  • Sheaves spin on high-load ball bearings with fitted races for low-friction operation.
  • Ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection.




2644 Block

Sheave diameter  1-9/16 inch 
Length  2-3/4 inch 
Weight w/ shackle  1.2 oz 
Shackle pin diameter  n/a 
Max. line diameter  3/8 inch 
Safe Working Load  485 lbs 
Breaking Strength  1620 lbs 
BRAND: Harken
Type: Blocks and Sheaves
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