Products & Services

40+ years keeping automotive OEM assembly lines running

McMasters Koss has supplied automotive OEM assembly lines and manufacturers with O-rings, gaskets and seals for over 40 years, with extensive experience meeting the JIT delivery needs that production assembly lines require.

Engineering Support

Available to OEM engineering teams and purchasing groups working to improve existing products.

Engineering Services

Testing & Inspection

Verify material compliance to specification and resolve non-conformances per APQP and your own requirements.

Testing & Inspection

O-Rings

McMasters Koss stocks most AS568 size O-Rings in the most popular compounds including Nitrile, Silicone, EPDM and Fluorocarbon (Viton)

Custom Molded

McMasters Koss supplies custom molded rubber parts and seals for automotive and industrial OEMs worldwide.

Oil Seals

Oil Seals can have outer metal or rubber surfaces with a variety of metal coatings and paints specified for metallic surfaces.

Backup Rings

Backup Rings (Anti-Extrusion) Devices are used in high pressure applications where standard elastomers would extrude or be damaged.

Diaphragms & Boots

We offer a wide variety of custom shapes molded in both rubber and plastic to meet a broad range of performance requirements.

Hydraulic & Pneumatic

Hydraulic and Pneumatic applications can utilize standard commercial products to withstand superior pressures.

Quad Rings

Quad Rings are used as low friction roll resistant seal in piston and dynamic sealing applications.

Rubber to Metal/Plastic

Harder Materials are required for high pressure applications with separate energizer component to provide seal.

Analytics Services

We offer custom colors and durometers in molded rubber and extruded shapes to match your unique requirements.

Have a Requirement or a Project?

Reach our sales engineering or engineering team about product requirements, engineering, test and inspection work.

Contact Sales
Contact Engineering

McMasters Koss has supplied automotive OEM manufacturers with O-Rings, Gaskets and seals for over 40 years and has extensive experience meeting the JIT delivery needs that production assembly lines require.

We stock most AS568 Sizes of Nitrile (Buna N), Silicone, EPDM and Fluorocarbon (Viton) O-Rings and a significant quantity of metric size O-Rings for commercial customers and OEM engineering groups.

Engineering support is available for OEM engineering teams and purchasing groups working on improving existing products.

Please click here to find out more about McMasters Koss engineering services.

Testing and Inspection Services are available to ensure compliance of material to specification and to address any non-conformances per APQP and customer requirements.

Please reach out to our sales engineering team or engineering team with any product requirements or opportunities to assist your team with any engineering, test or inspection projects.

McMasters Koss has supplied automotive OEM manufacturers with O-Rings, Gaskets and seals for over 40 years and has extensive experience meeting the JIT delivery needs that production assembly lines require.

McMasters Koss stocks most AS568 Sizes of Nitrile (Buna N), Silicone, EPDM and Fluorocarbon (Viton) O-Rings and a significant quantity of metric size O-Rings for commercial customers and OEM engineering groups.

Quad Rings, Back Up Rings and U Cups are available in most popular sizes for quick shipment.

Oil Seals, custom molded seal shapes and mechanical seals are supported by McMasters Koss with JIT delivery to customers as needed.

Engineering support is available for OEM engineering teams and purchasing groups working on improving existing products.

Please click here to find out more about McMasters Koss engineering services.

Testing and Inspection Services are available to ensure compliance of material to specification and to address any non-conformances per APQP and customer requirements.

Please reach out to our sales engineering team or engineering team with any product requirements or opportunities to assist your team with any engineering, test or inspection projects.