Bay Supply, a division of Bay Fastening Systems, is an online marketplace focused on fastening products and related industrial supplies. It brings sourcing professionals, manufacturers, and distributors together to search, request quotes, and conduct business through one platform. Buyers can browse supplier inventory, compare responses to a single request for quote, and use expert support and product guides to help identify suitable solutions. The marketplace also offers an MTO Part Builder for creating made-to-order products.

Its catalog includes a broad range of fasteners, including rivets, bolts, threaded inserts, lockbolts, nuts, screws, washers, pins, and spacers. Bay Supply also sells fastening and installation tools, power tools, adhesives, sealants, tapes, hardware, industrial safety supplies, and storage and material-handling products. Featured offerings include blind rivets, threaded inserts, cordless riveting tools, and products from brands such as Marson, POP, and Avdel. Manufacturers can present catalogs and receive buyer inquiries, while distributors can create seller profiles, respond to RFQs, and offer available inventory.