Rotek Inc., a ThyssenKrupp company and a producer of seamless rolled steel rings, is celebrating its 50th year in business. In addition, it recently achieved ISO 9001:2008, ISO 14001:2007 and ISO 18001:2007 certifications at its Aurora, Ohio, plant. “The ISO certifications strengthen Rotek’s industry-leadership position by helping assure our customers of continued product and process excellence as well as our commitment to employee health and safety and to the environment,” said Dr. Tim Gudszend, Rotek’s chief executive. “As part of our continuous improvement efforts, Rotek is beginning the ISO certification process for our plant in Florence, Ky., and we hope to secure those certifications by next spring.” The company also designs, develops and produces slewing bearings.