MSC Industrial Supply Co. | 69,391 followers on LinkedIn. MSC Industrial Supply is the source for your metalworking and MRO needs. Built to Make You Better. | MSC Industrial Supply Co. (NYSE:MSM) is a leading North American distributor of metalworking and maintenance, repair, and operations (MRO) products and services. We help our customers drive greater productivity, profitability and growth with more than 2 million products, inventory management and other supply chain solutions, and deep expertise from over 80 years of working with customers across industries.