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Our contact information
By standard mail:
350 Thorens Avenue
New Hyde Park, NY 11040
By phone:
(between 8 a.m. and 4:30 p.m. EST)

ABOUT MDI SUPPLY: is a leading American online wholesale store for commercial grade doors, frames, hardware and various door related accessories. Choosing the right commercial door opening products is not easy, but we are here to help you make a better buying decision to fit your specific application.


On our site, you will find major brands and large inventory to meet your commercial door, frame & hardware requirements.  If you need help with making a purchase, please  call or email us and one of our associates will assist you. We offer assistance via a toll free phone line or via email.  We carry quality products from companies like Norton, PDQ, ABH, Best, Hager, HES, Pemko, McKinney, Rockwood, Design Hardware, Ryobi, Stanley, Select, Yale, Stealth and more.


Since the beginning in 1972, MDI® has developed into a highly reputable company known for paying attention to detail and delivering products and service with only the utmost quality.  To maintain our commitment to excellence, we have invested extensively into our personnel, machinery & equipment, front & and back-end systems, our facility, R&D and now, most recently, our newly designed mobile friendly website,  These investments have made MDI a favorite among our customers.  


Professional service, quality and reliability are the components and commitment that make up the foundation that MDI® is built on.