Hydraulic seal size chart is given blow. Hydraulic seals have different sizes as per International standard. These sizes are determined by Piston od, cylinder groove id & cylinder groove thickness. Hydraulic seals are one of the most important parts of the hydraulic cylinders. Most of the hydraulic cylinder seals are Pu seals. Polyurethane Seal can reduce factory maintenance cost and OEM product cost. Pu hydraulic seals have better abrasion.
Hydraulic seal standard size chart
Piston-rod seal :
Piston-rod seal is a single acting symmetric seal. It is designed to have symmetrical lips in order to be used in both for rod and piston applications. In addition, It has mechanically trimmed lips. Therefore, it creates excellent contact pressure in both dynamic and static one-way sealing. Since it has symmetrical lips, it is applicable in both for rod and piston applications.
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 | U-cup Piston-rod seal is a single acting U-symmetric seal. It is designed to have symmetrical lips in order to be used in both for rod and piston applications.
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Rod Seals :
Rod seal is the most critical seal on any type of fluid power equipment. It prevents leakage of fluid from the cylinder to the outside. Leakage through a hydraulic cylinder can reduce equipment performance. In extreme cases it can cause environmental issues. Particular attention should be paid to pair the rod seal and the wiper for the best sealing performance. If a less effective rod seal is used in a hydraulic cylinder, the wiper can scrape off the microscopically thin film of oil that remains on the rod in microscopic surface imperfections during the return stroke, resulting in system leakage.
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 | Double lip Rod seal has two sealing lips. It is the most critical seal on any type of fluid power equipment. It prevents leakage of fluid from the cylinder to the outside. |
Wiper Seals :
Wiper seal ensures that foreign particles are not introduced into the hydraulic cylinders. The lip is designed in a particular way that it reliably wipes off the dirt but leaves a residual oil film on the rod. Its structure makes it excellent in dust resistance and less oil leakage.
Piston Seal :
Piston seals are located between the piston and the cylinder wall in a cylinder. It creates a pressure barrier and prevent fluid passing the piston. This pressure is required to control the cylinder motion or to maintain the position of the piston when at rest. Clearance between piston and cylinder wall is extremely tight. Piston seal has a vital role to maintain the relationship between these reciprocating components. Thus, correct seal size and material is critical to the performance of the cylinder.
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