Harken -12 Integral Backstay Cylinder - 40mm Bore, 385mm Stroke
Regular price £0.00Harken’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.
Footnote: For pin center length open add stroke length to pin center length closed., Max relief setting is 5, 000 psi / 345 bar., Rod ends (forks) included in weights.
| - Size | -12 | Pull force @ 1000 psi/69 bar (kg) | 952 kg |
| Maximum wire Ø (mm) | 8 mm | Pull force @ 2000 psi/138 bar (kg) | 1904 kg |
| Stroke (mm) | 385 mm | Pull force @ 3000 psi/207 bar (kg) | 2855 kg |
| Pin center length (closed) (mm) | 832 mm | Pull force @ 4000 psi/276 bar (kg) | 3807 kg |
| Weight (kg) | 4.92 kg | Pull force @ 5000 psi/345 bar (kg) | 4759 kg |
| Gap/pin Ø (mm) | 15.9 mm | Breaking load (kg) | 9518 kg |
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