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Quick Answer: OEM O-rings are round cross section seals used in original equipment assemblies. To specify an OEM O-ring correctly, send the OEM part number if available, plus ID, cross section, material, Shore A hardness, operating temperature, pressure, media, and required quantity. CORASEALS supplies OEM O-rings in NBR, FKM, EPDM, HNBR, FFKM, silicone, and custom compounds.
OEM O-rings are sealing elements chosen during equipment design and production. Procurement teams and maintenance engineers order these parts for new assemblies, production lines, repair kits, and custom sealing upgrades.
OEM O-ring buyers usually check dimensional tolerance, material quality, and repeat supply. The same O-ring may need to work in multiple units across different machines. A clear drawing or part number helps reduce ordering errors.
OEM O-ring sizes follow common industrial standards. AS568 sizes are widely used in North America. ISO 3601 sizes are common for metric equipment. JIS B 2401 sizes appear in Japanese and Asian machinery.
Always confirm the size format before quotation:
For O-rings, the normal size callout is ID × cross section. Some buyers also provide OD or width. Clarify the units and order of measurement before the order.
Material choice depends on the fluid, gas, temperature range, and mechanical conditions. The same O-ring size can fail in one compound and work in another.
Common OEM O-ring materials include:
If the application has high pressure, consider a harder compound or a backup ring. A Shore A 90 O-ring resists extrusion better than a Shore A 70 O-ring in most glands.
Send complete application data when requesting an OEM O-ring quote. Missing information often causes wrong material selection or long lead times.
For a custom O-ring, send a drawing, sample photo, or old seal. If the seal has a nonstandard cross section, include the groove width and depth.
OEM O-ring performance depends on the gland as much as the compound. Check the groove edges for nicks and sharp corners. Make sure the surface finish and runout follow the equipment drawing.
For dynamic applications, friction and wear change material choice. Softer compounds seal at lower pressure but may wear faster. Harder compounds can handle higher pressure but require better surface finish and accurate groove dimensions.
When extrusion is a risk, use a backup ring on the low pressure side of the O-ring. Backup rings are common in high pressure hydraulic systems.
An OEM O-ring is a round cross section seal used by original equipment manufacturers in new equipment or assemblies. Repair teams and distributors use the same O-ring as a direct replacement part.
Use inside diameter × cross section. If you have the OD instead, also provide the cross section or width. For standard AS568 O-rings, send the dash number and material.
NBR is a common starting point for mineral oil hydraulic systems. FKM and HNBR work in higher temperature or more aggressive oil applications. Confirm the full fluid formulation and temperature before final selection.
Yes. CORASEALS supplies standard and custom O-ring sizes. Send a drawing, sample photo, or exact ID and cross section. Include the material, hardness, and application conditions.
Send the seal type, material, ID × cross section, operating temperature, pressure, medium, Shore A hardness, groove dimensions, drawing, sample photo, and required quantity. If the O-ring is for a known OEM part number, include that part number too.
For OEM O-ring selection support, view our OEM O-ring product range or compare FKM O-rings for high temperature and chemical service. Send the application details to get a specific sealing recommendation.
