McMasters Koss has been supply automotive OEM manufacturers with O-Rings, Gaskets and seals for over 40 years and has extensive experience in providing the right production with JIT delivery needs that assembly line customers 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.
McMasters Koss Bulk Parts Shipment 
McMasters Koss Commercial O-Ring Inventory Hallway 
Customer Specific O-Ring Inventory 
McMasters Koss Bulk Inventory Area 
McMasters Koss Bulk OEM Storage Facility 
McMasters Koss JIT Delivery System 
McMasters Koss Durometer Testing Center 
McMasters Koss Inspection Capabiltiies 
ASTM Specifications for Testing and Compliance 
McMasters Koss Global Shipments 
McMasters Koss Headquarters Complex 
McMasters Koss Oil Seal Environmental Test Chamber 
Custom Molded Rubber Seals 
Fluorocarbon O-Rings and Molded Seals 
Extruded Rubber Gasket 
Custom Molded Rubber Seals 
O-Rings 
McMasters Koss APQP Compliance 
Custom Molded Ball Seals 
Custom Molded Rubber Seals Oil Seals 
Custom Molded Rubber Seals 
Custom Molded Rubber Seals 
Extruded Rubber Seals