Harken Single Acting Integral Backstay AdjustersView all products in Rigging Accessories

Binnacle.com #:  HCI006BCC
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Harken Single Acting Integral Backstay Adjusters

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New from Harken for 2022, these units are simpler and more affordable. Available in four sizes to fit boats 30' to 60' in length with stay diameters ranging from 7/32" to 3/8".
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Binnacle.com:   #HCI006BCC
Brand:  Harken
From:   CAD$2,999.95   to  CAD$3,299.95 
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Harken Single Acting Integral Backstay Adjusters

Harken integral backstay adjusters come in four sizes to fit boats 9 m to 18 m (30' - 60') in length with stay diameters of 5 mm to 10 mm (7/32" - 3/8").

Harken's integral hydraulic backstay adjuster provides the power to optimize sail shape quickly for racers and adjust mast tension for smoother furling for cruisers.

The cylinder features a built-in, single-acting pump. Every unit includes a hard coat-anodized aluminum cylinder and pump, valve, and stainless pump handle with two attachment options:

  • A supplied Roll Pin, that when installed, locks the handle permanently.
  • Or, the Roll Pin can be left off, and the handle can be inserted when needed but stored separately.
Cylinders include a clevis pin on both ends.

A fibreglass position indicator attached to the top clevis pin slides down the cylinder as it's retracted for repeatable tension settings.

Standard eye-jaw toggles fit all Harken cylinders and are recommended on all installations.

The pressure-release knob turns clockwise to close and pump, counterclockwise to release.

When closing the pump, the knob cannot be over-tightened by hand, preventing damage to the valve.

Release speed depends on how far open the knob is turned. Pressure relief is factory set to prevent the crew from over-tensioning the backstay.

All models have a 14.17" (360 mm) Stroke

Please consult the Harken Catalogue below for complete item details.

NOTE: These are Non Stock items with an approximate 14-21 Day shipping delay.

NOTE: Harken recommends attaching a toggle to the cylinder’s bottom clevis pin to accommodate stay movement.


  Harken Single Acting Integral Backstay Adjusters 2022 Catalogue
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      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
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 -6 Size with 7/16" Pin and 7/32" Maximum Wire Diameter 
-6 Size with 7/16" Pin and 7/32" Maximum Wire DiameterBinnacle.com #: HCI006BCC 
Maximum Wire Diameter: 7/32" - Gap/Pin Dia.: 7/16" - Pin Center Length (Closed): 30" - Pull Force: 3,770 lb. - Bore: 25 mm
MFG Part#: #: HCI006BCC
Our Price:CAD$2,999.95 
Add to Cart
 -10 Size with 1/2" Pin and 9/32" Maximum Wire Diameter 
-10 Size with 1/2" Pin and 9/32" Maximum Wire DiameterBinnacle.com #: HCI010BCC 
Maximum Wire Diameter: 9/32" - Gap/Pin Dia.: 1/2" - Pin Center Length (Closed): 30" - Pull Force: 4,710 lb. - Bore: 35 mm
MFG Part#: #: HCI010BCC
Our Price:CAD$2,999.95 
Add to Cart
 -12 Size with 5/8" Pin and 5/16" Maximum Wire Diameter 
-12 Size with 5/8" Pin and 5/16" Maximum Wire DiameterBinnacle.com #: HCI012BCC 
Maximum Wire Diameter: 5/16" - Gap/Pin Dia.: 5/8" - Pin Center Length (Closed): 30" - Pull Force: 6,710 lb. - Bore: 40 mm
MFG Part#: #: HCI012BCC
Our Price:CAD$3,299.95 
Add to Cart
 -17 Size with 5/8" Pin and 3/8" Maximum Wire Diameter 
-17 Size with 5/8" Pin and 3/8" Maximum Wire DiameterBinnacle.com #: HCI017BCC 
Maximum Wire Diameter: 3/8" - Gap/Pin Dia.: 5/8" - Pin Center Length (Closed): 30" - Pull Force: 8,390 lb. - Bore: 45 mm
MFG Part#: #: HCI017BCC
Our Price:CAD$3,299.95 
Add to Cart
Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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