Vulcan On-Board Scales are manufactured by Stress-Tek, Inc, which was founded in 1978 in Kent, Washington, near Seattle. Stress-Tek, Inc. originally provided professional consulting services in the fields of transducer design and experimental stress analysis.

Our operations have since expanded to the design and manufacturing of state-of-the-art force measurement devices for the Vulcan On-Board Scales business. Today we provide products to the trucking markets including timber, refuse, aggregate, and general trucking, as well as solutions for the aerospace, marine, medical, heavy machinery and process controls markets.