O-rings and Seals 

McMasters Koss Co.
4224 Normandy Court
Royal Oak, Michigan 48073

Phone: (248) 549-1414
Fax:    (248) 549-7753

(800) 548-0089

NOTICE: During this coronavirus (COVID-19) Emergency,
McMasters Koss Co. remains open and ready to serve you.

Effective immediately, we are restricting all visits to our facility. Exceptions will be made for visitors with an appointment and for commercial shipping/trucking company employees.

We have been deemed an Essential Business as we provide products and services that are critical to the manufacture and operation of essential goods used in the food, transportation, utility, HVAC, municipal water, agriculture, defense, medical, and construction industries.

Sealing Specialists

McMasters Koss Company provides IATF 16949 and ISO 9001 registered manufacturing and stocking distribution of seals, o-rings, gaskets, oil seals, diaphragms, caps, custom molded shapes, specialty plastics, insulating gasket kits, and pipeline cathodic protection systems.

McMASTERS KOSS employees put the right products in the right hands at the right time for the right price so our customers remain competitive and we remain profitable.

Our employees continuously improve what’s “right” to increase customer satisfaction and maintain regulatory compliance.

We sell high quality seals and components to OEMs in the following fluid power applications: automotive, industrial, consumer, gas, water, and electric utilities, diesel, heavy equipment, hydraulic, pneumatic, military, medical, semiconductor, and aerospace.

Our worldwide IATF 16949 manufacturing plants, global logistics expertise, and value added consignment and distribution services will provide great quality and value for your company.

Contact our experienced sales engineers at
+1 (800) 548-0089 for solutions to your sealing problems.