Hydraulic & Pneumatic
U-Ring
A U-shaped lip profile for rod and piston sealing positions in hydraulic or pneumatic reciprocating applications.
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- U-shaped lip profile
- Reciprocating service
- Application-based materials
Product overview
Understand the Product Before Selecting a Specification
ouning supplies U-rings for reciprocating hydraulic and pneumatic equipment. The U-shaped lip is used on rods and pistons when the housing is designed for this profile. Material, hardness, and size should be confirmed against pressure, speed, media, and the mating hardware.
U-shaped lip profile
The open lip is intended for rod and piston positions in reciprocating motion when the groove or housing matches the profile.
Reciprocating service
U-rings are typically reviewed for stroke, speed, pressure, and whether the position is on the rod or the piston.
Application-based materials
Material and hardness should be selected against the media, temperature, pressure, and expected service cycle.
Product scope
Applications, Materials, and Supply Options
Use these categories as a starting point. The final specification depends on the complete application.
Common Applications
- Hydraulic cylinders
- Pneumatic cylinders
- Rod sealing positions
- Piston sealing positions
Material Options
- NBR
- FKM
- EPDM
- Application-specific compounds reviewed against the service conditions
Supply Capabilities
- Standard and custom sizes
- Material selection support
- Sample and batch production
- Dimensional inspection
Before requesting a quote
Selection Factors for U-Ring
More complete input leads to a clearer product and material discussion.
Housing and size
Provide rod or bore diameter, groove or housing dimensions, and any applicable drawing or standard.
Motion and pressure
State whether the position is rod or piston, plus stroke, speed, and working pressure.
Working conditions
List the media, continuous and peak temperature, and whether the duty is hydraulic or pneumatic.
Validation needs
Include sample quantity, inspection dimensions, and any approval process required for the project.
Project workflow
A Practical Review Process
The steps remain clear whether you are identifying a standard part or developing a custom specification.
- 01
Define
Share the product, drawing, dimensions, service conditions, and quantities.
- 02
Confirm
Align the material, hardness, tolerances, tooling, samples, and documentation.
- 03
Validate
Review samples and complete the application-specific approval process.
- 04
Supply
Maintain confirmed specifications and identification for repeat requirements.
Questions & answers
U-Ring Questions
Common questions about selecting and requesting U-Ring.
Is a U-ring the same as an O-ring?
No. A U-ring has a U-shaped lip for reciprocating rod or piston positions. Groove design, squeeze, and hardware must match the selected profile.
Which material should I choose for a U-ring?
The choice depends on the media, temperature, pressure, speed, and housing. Share these conditions for a practical review.
Can you review a custom U-ring size?
Yes. Send a dimensioned drawing or housing information together with the application conditions and required quantity.