Company History

When Auto-Diesel Piston Ring Company was founded in 1921 in New Haven Connecticut, the main objective was to manufacture parts for the automotive industry. In 1925 the Company was moved to Cleveland, Ohio by Rolland D. Smith. The company was incorporated in Ohio in 1941 with Albert Sawyer serving as its first President, and Rolland Smith as General Manager.

Company Progress

In the 1940's, Auto-Diesel was heavily involved in the automotive parts industry, as well as providing piston rings and gaskets needed during World War II for ships, tanks and steam locomotives required in the war effort. During the War, Auto-Diesel operated three shifts around-the-clock as a defense contractor.

But times quickly changed and so did the Auto-Diesel product line. Today, more than fifty years later, Auto-Diesel specializes in piston rings for industrial uses such as hydraulic and pneumatic applications and stainless steel plunger rings for the die casting industry. Stainless steel plunger rings were developed to protect the plunger tips on zinc die casting machines. Auto-Diesel has been serving this industry for more than 50 years.

We manufacture cast iron rings from 1" to 30" and stainless steel plunger rings from 3/4" to 7". All cast iron rings are manuractured-to-order to our customer's specifications. The most popular sizes of stainless steel rings are stocked for immediate delivery. SERVICE and QUALITY are two of our main objectives. All piston rings are manufactured with precision to meet industry standards.