• Scienda Building Sciences

• Seneca Environmental Products

• Shenango Steel Buildings

• Skylark Shelter Systems

• Spectrum Hardwoods

• State Street Steel

• Steel Building

• Steel Elements, Inc.

• Steel Frame kits

• Steelox Systems

• T.A. Caid Industries

• Tate Ornamental

• Tebo Store Fixtures

• The Freeman Corporation

• Timberwright Manufacturing Inc.

• Tops-In-Quality

• Trent Tube

• Tri-Steel Homes

• Tristate Wholesale Building Supplies, Inc.

• Troglen Ornamental Iron

• TuffBilt Corporation

• Tyco Engineered Products & Services

• Unistrut Corp.

• United Metal Fabricators of Texas

• United States Steel Corporation (formerly Stelco)

• United Steel Products