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McMasters Koss Headquarters Building

McMasters Koss Company Designs and sells O-Rings, Custom-Molded Rubber Shapes and Oil Seals to OEM’s in the automotive, heavy duty truck and industrial markets

McMasters Koss Engineering Team

Whether it is keeping your production line running, having the parts you need to complete a job or designing a new seal or molded shape to reduce leakage or wear, we are ready to serve.

All of our parts experience an incoming inspection as they enter our building and a second inspection before they are shipped to you.

We also offer 100% inspection for special circumstances.

Iso Certificate Scope

McMasters Koss Company is ISO 9001:2015 Registered and offers APQP production and all levels of PPAP documents as well as NAFTA and material certifications.

We stock all sizes of Nitrile, Silicone, EPDM and Fluorocarbon (Viton) O-Rings with most popular metric sizes.

Quad Rings, Backup Rings and Oil Seals are supported on the most popular sizes.

JIT delivery is supported by maintaining reserve inventory for any OEM blanket orders.

  • McMasters Koss Inventory for JIT Delivery
  • Shipping Department
  • Pallet ready to ship
  • Durometer Tester
  • O-Ring Micro Vu Measurement
  • ASTM Standards for O-Rings
  • McMasters Koss Global Shipping
  • McMasters Koss Headquarters Complex
  • Oil Seal Environmental Test Machine
  • Quad Rings
  • Fluorocarbon O-Rings and Seals
  • Custom Molded Rubber Seals
  • O-Rings
  • McMasters Koss PPAP with APQP Manuals
  • White Rubber Balls
  • Molded Rubber Seals
  • Oil Seals
  • Custom Molded Seals
  • Extruded Rubber O-Rings