Spring Assist Hinge (HG-PA27-45) This external surface-mounted spring assist hinge (Product No. HG-PA27-45) provides a power assist to help users open heavy lids more easily, while also ensuring that the lid closes smoothly and never slams shut. This hinge provides 45 Nm (459 kgf-cm) of torque, making it a very heavy-duty hinge capable of handling large lids or doors, including in commercial or industrial applications. As with all products, the construction is precision-engineered for a long service life of superior performance for the end user. HG-PA27-45 Spring Assist Hinge Technical Details Easily open heavy lids or doors, and close them gently and smoothly. Designed for upward-opening applications. Mounts to the external surface. Lift-assist / damper torque is 45 Nm (459 kgf-cm), guaranteed within 1%. Torque is adjustable (+/-5%) through manipulation of the torque adjustment screw. Hinge opens to 1 degrees, with torque assistance up to 9 degrees. Product dimensions are 274 182 56 mm; weight 25 grams. Steel spring is SWO grade; hinge body is stainless steel 43 grade. Hinge includes a smooth plastic cover for a neutral, clean overall appearance. See Installation Manual.WARNING: This product can expose you to chromium, nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.