What is the Hydraulic floor spring? The Hydraulic Floor Spring, also called Hydraulic Hinge, designed as a swinging door hinge, users will benefit from it's simple and quick installation - No need for a cavity or digging into the floor to attach a cement box. Traditional floor spring closers require a recess in the concrete floor, since the Hydraulic Concealed Floor Spring can be mounted without a cavity in the ground, it greatly reduces the installation costs. Also suitable for underfloor heatings to a limited extent, which offers great choice in door closers and floor springs Adopting top quality Streched aluminium alloy raw material, under the advanced technology of die casting, this Hydraulic Patch Fitting body is very compact in construction, non oil leakage, non-corrosion and high durability. The maximum load capacity amounts to 100 kg. The system allows for door widths of 800 / 900 / 1000 mm and heights up to 2500 mm for 8 - 12 mm tempered glass. The concealed floor spring was successfully tested with 300,000 opening cycles – this makes it suitable for use in a private setting but also for office buildings. While the cheap product may only with 180,000 cycles. When closing the door, the Hydraulic Hinge operates starting from an opening angle of 30° and gently draws the door back into its original position. The door reaches its hold position at an opening angle of 90°, max opening angle can be 145°. The Base Plate is also adjustable to ensure alignment of the door panel. The Stationery position of the door can be adjusted horizontally left to right and forward and back by 3cm with the door opening angle also adjustable by 4°. Specially, for better installation, we will have a black plate for helping drilling the base to the floor. Below shows the installation drawing.