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Learn how O-rings work, how they are measured and how to select the right material for industrial applications.
An O-ring is a circular sealing element with a round cross section and is one of the most widely used sealing components in industrial machinery.
O-rings are commonly found in hydraulic equipment, pneumatic systems, pumps, valves, fittings and many other industrial assemblies.
When an O-ring is installed in a properly designed groove and the mating components are assembled, the O-ring is compressed between the sealing surfaces.
This compression creates sealing contact that helps prevent oil, water, compressed air or other process media from passing through the joint.
Incorrect dimensions, material selection or groove conditions may lead to premature leakage, deformation, swelling, hardening or cracking.
O-ring dimensions are commonly specified as ID × CS.
For example, an O-ring specified as 30 × 3 mm has a 30 mm inside diameter and a 3 mm cross-section diameter.
Widely used for oil-related and general industrial applications. Flow Engineering's catalogue lists an operating temperature range of -40°C to +100°C.
Used where higher temperature resistance and compatibility with oils, fuels and selected chemicals are required. The catalogue lists -20°C to +200°C.
Commonly considered for water, steam, ozone and outdoor environments. The catalogue lists -50°C to +150°C.
Provides a broad temperature range. The catalogue lists -60°C to +230°C, with high-temperature grades up to +300°C.
Suitable for applications requiring broad chemical and temperature resistance. The catalogue lists -200°C to +260°C.
Another material option used in industrial sealing. Flow Engineering's catalogue lists -40°C to +90°C for PU O-rings.
O-rings with similar appearances are not necessarily interchangeable. Small differences in dimensions or material may affect compression, clearance and sealing performance.
When the original specification is unknown, dimensions and operating conditions should be reviewed rather than identifying an O-ring by colour or appearance alone.
Send us the dimensions, product photograph or existing sample together with temperature, pressure and process media for an initial review.
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