Harken -10 Integral Hydraulic Backstay Adjuster

Brand: Harken
Product Code:

Harken’s integral hydraulic backstay adjuster provides the power to optimize sail shape quickly. The cylinder features a built-in, double-acting pump that delivers oil when the handle is both pushed and pulled. This moves oil through the system twice as fast as single-acting pumps on other integrals.

Assemblies include a hardcoat-anodized aluminum cylinder and pump, valve, gauge, and stainless pump handle with three attachment options: pin installs handle permanently; O-ring secures handle in socket, but is not permanent; nonlocking handle installs without O-ring and roll pin. All pins and plugs are stainless steel. Cylinders include a clevis on both ends. Standard eye-jaw toggles fit all Harken® cylinders.

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 crew from over-tensioning the backstay.

An analog gauge with pressure increments reading 0-5 (0-5000 psi) is prominently mounted at the top of the cylinder. The gauge adjusts to four positions for easy viewing from the cockpit.

- Size-10 
Maximum wire Ø (mm)7 mm
Maximum wire Ø (in)9/32 in
Stroke (mm)343 mm
Stroke (in)13.5 in
Pin center length (closed) (mm)762 mm
Pin center length (closed) (in)30 in
Weight (kg)3.37 kg
Weight (lb)7.4 lb
Gap/pin Ø (mm)12.7 mm
Gap/pin Ø (in)1/2 in
Pull force @ 1000 psi/69 bar (kg)564 kg
Pull force @ 1000 psi/69 bar (lb)1243 lb
Pull force @ 2000 psi/138 bar (kg)1128 kg
Pull force @ 2000 psi/138 bar (lb)2487 lb
Pull force @ 3000 psi/207 bar (kg)1692 kg
Pull force @ 3000 psi/207 bar (lb)3490 lb
Pull force @ 4000 psi/276 bar (kg)2250 kg
Pull force @ 4000 psi/276 bar (lb)4960 lb
Breaking load (kg)5608 kg
Breaking load (lb)12364 lb