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Integral Backstay

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, 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.

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

  Prod No. Name Maximum wire Ø (mm)Maximum wire Ø (in)Gap/pin Ø (mm)Gap/pin Ø (in)
-6 Integral Backstay Cylinder — 25 mm Bore, 345 mm Stroke(1) HCI025110345BCC.NG -6 Integral Backstay Cylinder — 25 mm Bore, 345 mm Stroke 5.57/3211.17/16
-10 Integral Backstay Cylinder — 35 mm Bore, 345 mm Stroke(1) HCI035130345BCC.NG -10 Integral Backstay Cylinder — 35 mm Bore, 345 mm Stroke 79/3212.71/2
-12 Integral Backstay Cylinder — 40 mm Bore, 385 mm Stroke(1) HCI040160385BCC.NG -12 Integral Backstay Cylinder — 40 mm Bore, 385 mm Stroke 85/1615.95/8
-17 Integral Backstay Cylinder — 45 mm Bore, 385 mm Stroke(1) HCI045160385BCC.NG -17 Integral Backstay Cylinder — 45 mm Bore, 385 mm Stroke 9.53/815.95/8
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