How to identify seals and o-rings
Seals prevent leakage of fluid and entry of contamination at joints and shafts.
Have one in front of you? Photograph it and get an evidence-backed identification.
Identify from a photoIdentification clues
- —Cross-section profile
- —Inner diameter, outer diameter and section
- —Colour and texture as a material hint (not proof)
- —Spring or garter visible
- —Markings on metal-cased lip seals
Common types
- —O-ring
- —Radial lip seal
- —Mechanical face seal
- —V-ring
- —Hydraulic rod/piston seal
- —Gasket
Typical failure modes
- —Extrusion
- —Compression set
- —Chemical swelling
- —Heat hardening and cracking
- —Lip wear and shaft grooving
What a replacement must match
- —Measure ID, OD and section accurately
- —Match material to fluid and temperature
- —Match hardness
- —Check groove dimensions
Photos that help identification
- —Photograph next to a ruler
- —Show the profile cut or edge-on
- —Show both faces of lip seals
Need a replacement?
Enter a part number or upload a photo to search verified supplier listings.
Find a replacementRelated components
Related guides
General reference information. Always verify against the manufacturer’s documentation before ordering or installing.