custom steel doors and frames on commercial building

The #1 resource for steel doors and frames

SDI standards have been specified for over 50 years. As the door and hardware industry evolves, the standards are updated to reflect current best practices. By specifying steel doors and frames to our standards and from SDI Certified manufacturers, you can be assured to receive high-quality standard and custom products.

Steel door & frame installation

Videos and manuals in English and Spanish

People often blame the manufacturer when there are issues, when in fact the problem lies with poor installation. With these step-by-step guides, there is NO EXCUSE for improper installation!

Free installation guides


Models and details available in PDF, AutoCAD, Revit, and SketchUp formats

September 2019: 16 new drawings added

View and download drawings

What’s new?

Steel Doors

New Video on Fire Rated Doors and Frames

September 2019 - The SDI has produced a two-minute overview video on fire rated doors and frames. See where they are required, how they are tested, and learn about labels. Watch the video

See our Fire Rated Doors page for more resources and SDI Certified manufacturers.