NBR FKM Piston Seal

NBR FKM Piston Seal

The NBR FKM Piston Seal is mounted on the piston and serves to seal the gap between the piston and the cylinder to prevent leakage of hydraulic oil. The piston seal is the main seal in the hydraulic cylinder. It is one of the most important seals for the hydraulic cylinder to withstand the pressure. The main requirements for the piston seal are good sealing effect, good pressure retention effect in static state, strong pressure bearing capacity during exercise, anti-extrusion, small friction coefficient, long service life, etc....

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Product Description

1) Hydraulic seals describe a class of seals that are used in applications with either rotary or reciprocating motions.

2) Hydraulic seals are exposed to hydraulic fluids such as hydrocarbon and phosphate ester and are designed for high-pressure dynamic applications such as hydraulic cylinders. Hydraulic seals usually need to be higher friction seals than pneumatic seals but often operate under lower operating speeds.

3) The sealing orientation for hydraulic seals can include internal (rod seal), external (piston seal), symmetrical or axial seal. With the internal (rod) seal, the seal is fit into a housing bore and the sealing lip touches the shaft.

4) With the external (piston) seal, the seal is placed onto a shaft and the sealing lip touches the housing bore.

5) Since symmetric seals are the same on both sides they will function as either a rod or a piston seal. The axial seal fits axially against the housing.

6) Rotary applications need only one hydraulic seal (single acting) because it can seal in the one axial direction the application is moving.

7) However, a reciprocating application will need two hydraulic seals (double acting), one for each of the directions.

8) The life of hydraulic seals is dependent on many factors including the maximum operating speed, maximum operating temperature, maximum operating pressure and the vacuum rating.

9) When ordering hydraulic seals you will want to know the shaft outer diameter or seal inner diameter, housing bore diameter or seal outer diameter, the axial cross section and the radial cross section.

NBR FKM Piston Seal

Product Material

O ring NBR / FKM (Special on request)  

Slide ring: PTFE-glass

(Special on request)

Product Specification

Pressure [MPa] 60

Temperature [° C] -45...+200

Sliding speed[m/s] 15

Medium: Mineral oil based hydraulic fluids, barely flammable hydraulic fluids, water, air and others.

Product Packaging

(1)Packed by plastic bags,put into Plywood cases that don't need fumigation. Other packing is customized according to client's requirements.

(2)PTFE surface treated should be kept in dark place, can not be damaged.

NBR FKM Piston Seal

Company Profile

NBR FKM Piston Seal


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