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MRO Hardware, A OneMonroe Company, is a ISO 9001:2015 certified global industrial manufacturing company offering a broad range of industrial fasteners and components and has a diverse customer base of manufacturers, distributors and catalog-houses across several vertical markets including aerospace/defense, automotive, medical, transportation, renewable energy, and many more. MRO Hardware, a OneMonroe Company, has a rich history dating back to the 1920s and Otto Siewek’s role in developing “tooling components”, which helped standardized mass production of automobiles. Whether you need a quick part to complete a job or need help with a precision custom manufacturing job, we have the resources and staff available to assist and get the job done right.