MCMASTER-CARR 成立于1901年，是美国首屈一指的工业品分销商，拥有超过555,000种产品，包含机械传动件、紧固件、密封件、管件接头、电子元器件、流体控制、压力控制及其它五金配件，其产品广泛应用于航空、化工、食品、医疗等各个行业。公司总部设立在埃尔姆赫斯特（伊利诺斯州）。

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.

The company is based in Elmhurst, Illinois and has distribution branches in Robbinsville, New Jersey; Santa Fe Springs, California; Douglasville, Georgia and Aurora, Ohio.

Originally founded as McMaster Davis, McMaster-Carr got its current name in 1901 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.