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Header U-ring

Static Seals U-ring Type UH

The UH profile rings are fluid connector seals. These consist of a pure elastomer seal according to the DIN EN ISO 1179-2 (imperial) and DIN EN ISO 9974-2 (metrical), former DIN 3869. By compressing the elastic sealing profil ring, the sealing element is pressed into the installation space and seals between the two flat surfaces of the components to be joined.

The UH is available in a variety of common elastomer materials. The most common of these would be NBR, FKM and EPDM.

U-ring Type UH

Fields of application
single acting
double acting
Main use sealant for connection elements
Materials elastomers
  • application in high pressures
  • simple and fast assembly
  • standardized dimsensions

Fields of application 
Elastomeric profile sealing rings according to the DIN EN ISO 1179-2 and DIN EN ISO 9974-2 (former DIN 3869) for sealing connecting elements and screw-in sockets. Groove dimensions according to the DIN 3852 Part 11.

Main fields of application:

  • axial-static sealing

Technical values

Pressure up to 63 MPa
Temperature -30°C / +80°C (material dependent)
Speed -
Pressure up to 63 MPa
Temperature -40°C / +130°C (material dependent)
Speed -
Pressure up to 63 MPa
Temperature -20°C / +200°C (material dependent)
Speed -
Maximum values temperature, speed and pressure are simultaneously not applicable! The values vary in dependence of material and media. For technical queries please contact our application consultants – we have the right solution for you. 

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Further to U-ring Type US
Further to U-ring Type US
Bild 2-UH-Ring-Definition-EN

Definition of UH-ring dimensions and ordering sizes

  • Inch and metric thread sizes according to DIN EN ISO 1179-2 or DIN EN ISO 9974-2 (formerly DIN 3869).

Sealing effect

The sealing effect of the UH-ring is the result of the axial compression of the ring when it is installed. The system pressure additionally increases the pressure on the sealing surfaces.

Operating parameters

For a reliable sealing function, the following application parameters and their limit values must be checked in relation to each other.

Bild 3 UH-Ring-Einbau

Design information

Installation of the seal is to be in a screw connection groove or a screw-in socket, specified in accordance with DIN 3852 Part 11. Process pressures to be max. 63 MPa depending on the material.

Attention: U-rings are not suitable for securing screws!

Assembly instructions

To exclude possible sources of error, ensure that the following points are observed for the sealing function when installing UH-rings:

  • defined insert inclinations, burr free, rounded-off transition
  • surface quality Ra < 1,6 µm, Rmax < 6,3 µm
  • burr-free rounded-off holes and slits 
  • damage caused by the thread must be avoided
  • installation tools to pass over sharp edges and corners (e.g. threads)
  • dirt-free sealing surface
  • UH-ring must not be overstretched  
Mr. Andreas Raidt
Your contact person for

Technology - General sealing topics, special constructions

Mr. Andreas Raidt
Head of Engineering
Do you have any questions, ideas, or suggestions? We are more than happy to assist you with advice. In person, over the phone, or digitally.

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