Wikipedia
McMaster-Carr
McMaster-Carr Supply Company is a private, family-owned supplier to industrial and commercial facilities worldwide, specializing in next day delivery of Maintenance, Repair and Operations (MRO) materials and supplies. McMaster maintains over 555,000 products in a catalog offering a 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; Atlanta, Georgia and Cleveland, Ohio.