Rubber Cup Seals

Rubber U-Cup and Lip Seals for Basic Hydraulic, Pneumatic and Other Dynamic Applications

• U-Cups are designed for dynamic reciprocating applications up to 1250 PSI
• U-Cups have longer sealing life than O-Rings due to lower friction
• Also available in non symmetrical Rod and Piston configurations
• Polypaks® are energized by an O-Ring to provide sealing force at low pressure
• U-Cups can be designed for use in some reciprocating and rotary applications
• Custom Lip Seals can be designed to perform in non-standard existing grooves

Standard Rubber U-Cup Configurations

Highest Availability in 70 durometer Nitrile but available in any material. Angled and Straight Lip styles are vitually interchangeable in basic applications

Angled Lip Standard U-Cup

(Parker U-Cup 8400 Style)

Straight Lip Standard U-Cup

(AN6226 Style U-Cup)

Common Custom Rubber U-Cup Configurations

Our expert engineers can assist with designs to maximize performance often with costs only slightly more than similar commodities. Let us help you differentiate yourself from the competition

Thin-lip custom U-Cup

• Designed for lower friction and quicker reaction to pressure.
• Suitable for reciprocating and medium speed reciprocating.

Heavy-lip custom U-cup

• Designed for heavier loading and more positive sealing capabilities.
• Suitable for reciprocating and low rotary applications.

Non-symmetric custom U-Cup

• Designed for fast reciprocating and/or fast rotary applications.

For higher performance application with extreme temperature, pressure or chemicals consider Metallic Spring Energized PTFE Seals .