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McMaster-Carr Supply Company is a private supplier of hardware, tools, raw materials, and maintenance equipment and supplies. McMaster maintains a wide variety of mechanical, electrical, plumbing, and utility hardware not usually located from a single source.
Originally founded as McMaster Davis, McMaster-Carr got its current name in 1917 when Harry and James Channon purchased the company. Harry and James were the sons of Henry Channon the founder of the H. Channon company, a large Chicago distributor of maritime and steam engine supplies. 
McMaster-Carr annually releases a large catalog containing the bulk of its product selection. The print edition of the catalog is noted for its limited distribution, sent only to established customers.
McMaster-Carr's website has been used as a positive example of link-rich design and good user interface. The website also includes useful design tips and explanations of material properties as well as a categorical parametric search engine. McMaster Carr withholds manufacturer identification and brand names of most of the products they sell. The site ranked third in a 2002 study performed at Stanford University about trust and credibility, just behind Amazon and Barnes & Noble.
Mobile phone app
- "Company Overview of McMaster-Carr Supply Company". Bloomberg Business. Retrieved March 28, 2015.
- "McMaster-Carr - Contact Us". Retrieved March 28, 2015.
- The Chicago Daily Tribune, July 11, 1919, "Channon to Pay $450,000 to Two Sons he 'Fired'"
- LaPlace, Jules (August 28, 2013). "McMaster-Carr Catalog". AIGA. Retrieved March 28, 2015.
- Sung, John (March 18, 2015). "Techronomicon: The McMaster-Carr Catalog". Highway1. Archived from the original on April 2, 2015. Retrieved March 28, 2015.
- Spool, Jared M. (June 15, 2006). "Lifestyles of the Link-Rich Home Pages". User Interface Engineering. Retrieved March 28, 2015.
- Fogg, B. J.; Soohoo, Cathy; Danielson, David; Marable, Leslie; Stanford, Julianne; Tauber, Ellen R. (November 11, 2002). "How Do People Evaluate a Web Site's Credibility?" (PDF). Archived from the original (PDF) on June 13, 2010.
- Edman, Lenore (June 18, 2013). "McMaster-Carr iPad App". Retrieved March 28, 2015.
- VendOp Best B2B Vendors 2015