Harken 57mm Carbo AirBlocks

Priced: $37.99 Rated:   - 5 stars out of 5 by 4 reviews.
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Harken 57mm Carbo AirBlocks -

From the folks who invented ball bearing blocks, this line of blocks boasts an excellent strength-to-weight ratio. The plastic in their sideplates, sheaves and balls makes them 30% lighter, 60% stronger and generally less expensive than equivalent conventional blocks.

The tiny 29mm block is extremely strong. 29mm doubles and triples feature a U-lock to hold the swivel in the front or side position, or allow it to spin freely. Use the 29mm Carbos as mainsheet blocks on dinghies, or for low-friction applications on any size boat.

Use the 40mm blocks for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats. The 40mm blocks handle loads similar to Harken's 2.25" blocks.

The 57mm blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards and control lines. This range handles loads similar to Harken's 3" standard blocks.

The 75mm Carbo Blocks are the only all-plastic blocks with a safe working load over 1,200lb. Because of their large-diameter sheaves and fitted ball races, they release easily under load and keep weight to a minimum. Perfect for mainsheet systems on racing boats and cruisers looking for better performance at a reasonable price. The 75mm single block weighs in at a remarkable 6.9oz. including the shackle, and the double and triple blocks aren't much more, giving an extremely high strength-to-weight ratio.

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Harken 57mm Carbo AirBlocks Reviews:


Awesome block

I purchased this block to use in my single line reefing system at the base of the mast.I purchased the double block and I run two different reef lines through it. It is a lightweight block, the line move smoothly through it and it is generally a top quality product.
ron at WestMarine.com on 08/08/2013

Best value vs. performance!

These blocks are by far the best value. My boat came with a different brand from the factory, but I'm steadily upgraded to all Harken Carbo because of the weight, performance, and look.
NautiC25 at WestMarine.com on 07/07/2012

Adjustable cam cleat a plus - up+down

Using this with adjustable cam cleat for my mainsheet on 28'. Works great.
WJRyan at WestMarine.com on 08/08/2011

every sailboat needs these

allways the perfect block for whatever the application!
cap'n ray at WestMarine.com on 07/07/2011