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  • Steel Door Institute, Steel Door, Fire Rated Doors, Hollow Metal Door
  • Steel Door Institute, Hollow Metal Frame, Door Specifications, Steel Door Manufacturers
  • Steel Door Institute, bullet resistant doors, Door Standards, Hurricane Doors
  • Steel Door Institute, Steel Door Specification, Fire Rated Door Frame, Steel Fire Door, jamb construction details, how to install steel door frames, standard metal door sizes, hour labeled door, heavy duty steel doors
  • Steel Door Institute, Tornado Doors, Acoustic Doors, Blast Doors

Strong, Sustainable, Stunning

SDI sets the standards - and exceeds yours

The Steel Door Institute (SDI) was established in 1954 as a voluntary, non-profit business association that develops quality and performance standards for steel doors and frames.

Representatives of SDI member companies create and publish these standards, which are made available without charge to architects and other design professionals to ensure quality and consistency of hollow metal doors and frames used in construction.

As a complete hollow metal door and frame resource, the SDI website provides all standards, an extensive set of Frequently Asked Questions, and a Gallery of Products. SDI also offers online education for AIA and GBCI credit.

SDI members are steel door and frame manufacturers who have passed an on-site audit from hollow metal door and frame engineers. When you specify an SDI door you can be assured you will receive a product that is well-constructed, tested, and evaluated to meet your specifications.

Earn AIA and GBCI Hours Online

Steel: Green Now, Green Forever >>
One GBCI / HSW Hour

NEW! Specifying Specialty Steel Doors: A Primer on Acoustic, Tornado, and More >>
One HSW Hour

Steel Doors and Frames 101 >>
One HSW Hour


Installing a Door Frame in Steel Stud Construction >>
Why Steel >>