The leading provider of rubber and plastic sealing components
At McMasters Koss Company, we design and supply O-rings, custom-molded rubber parts, and oil seals for OEMs in the automotive, heavy-duty truck, and industrial markets. With decades of experience, we help keep your production running smoothly, one seal at a time.
We're your partner
At McMasters Koss Company, we’re more than just a supplier, we’re your partner in every step of the process. From design to delivery, we walk alongside you to provide high-quality O-rings, gaskets, custom-molded seals, and oil seals through IATF 16949 and ISO 9001:2015 certified manufacturing and distribution.
With over 20 years of experience supporting engineering teams across North America and around the globe, we’re here to help your production run smoothly and efficiently. Whatever sealing solution or logistics challenge you’re facing, our team is ready to work through it with you.
Our Clients Say it Best
