1/2 x 3/4 x 1/8

**Availability: A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab. To check current tooling, review the Part Number Look-up document. Contact Parker for requirements outside typical ranges.

Parker’s 8400 Profile U-cup is a light load, symmetrical lip seal 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. The 8400 style utilizes a beveled lip, ideal for wiping fluid film. Available in a variety of elastomer compounds to cover a wide range of applications. The 8400 U seal is primarily designed for pneumatic applications to 250 psi, however, it can also be used in low to medium pressure hydraulic applications. The pressure range of the U ring seal may be extended by incorporating an 8700 Series anti-extrusion back-up.

Standard Materials:
• N4180A80 NBR; Temp -40 / +250F; Pressure* 1,250 psi hydraulic (250 psi pneumatic); Surface speed** <1.6 ft/s
• N4274A85 XNBR; Temp -10 / +250F; Pressure* 1,750 psi hydraulic (250 psi pneumatic); Surface speed** <1.6 ft/s
• V4208A90 FKM; Temp -5 / +400F; Pressure* 2,000 psi hydraulic (250 psi pneumatic); Surface speed** <1.6 ft/s
• E4259A80 EPDM; Temp -65 / +300F; Pressure* 1,250 psi hydraulic (250 psi pneumatic); Surface speed** <1.6 ft/s

*Pressure range shown is for systems without wear rings. If used with wear rings, consult Engineering Section (Section2) of Parker’s Fluid Power Seal Design Guide, Catalog EPS5370.

**Surface speed for pneumatic applications <3.3 ft/s

Alternate Materials: For applications that may require an alternate material, please contact your Parker EPS representative.

Typical applications:
• Dynamic sealing of hydraulic & pneumatic cylinders and equipment components