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Parker Hydraulic Symmetrical Seals

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8400 Profile, Light Load U-cup with Beveled Lips;
8500 Profile, Light Load U-cup with Scraper Lips

Parkers 8400 and 8500 Series u-cups are symmetrical lip seals for use in either rod or piston sealing applications. The thin, flexible lip design reacts to low pressure and provides an extremely smooth, steady movement with less break away force required because of the inherent low friction.

Both the 8400 and 8500 u-cups are produced from the same molds. The 8400 style utilizes a beveled lip, ideal for wiping fluid film, while the 8500 design utilizes a flat, scraper lip that yields additional lip interference and wipes contamination away from the sealing edge.

Both u-cup profiles are available in a variety of rubber compounds to cover a wide range of applications. While the 8400 and 8500 u-cups are primarily designed for pneumatic applications, they can also be used in low to medium pressure hydraulic applications. The pressure range of the u-cups may be extended by incorporating an 8700 back-up ring.

Technical Data

Standard Materials* Temperature Range Pressure Range† Surface Speed
N4180A80 -40F to 250F
(-40C to 121C)
1250 psi
(86 bar)
< 1.6 ft/s
(0.5 m/s)
N4274A85 -10F to 250F
(-23C to 121C)
(120 bar)
< 1.6 ft/s
(0.5 m/s)
V4208A90 -5F to 400F
(-21C to 204C)
(137 bar)
< 1.6 ft/s
(0.5 m/s)
E4259A80 -65F to 300F
(-54C to 149C)
(120 bar)
< 1.6 ft/s
(0.5 m/s)

* Alternate Materials: For applications that may require an alternate material, please consult Industrial Seal Inc.
† Pressure Range: without rear wings.


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