Corporate
- Caparo Bull Moose® – http://www.caparobullmoose.com
- Caparo – http://www.caparo.co.uk/en-gb/
Industry
- American Institute of Steel Construction – http://www.aisc.org
- American Iron and Steel Institute – http://www.steel.org
- Steel Manufacturers Association – http://www.steelnet.org
- Steel Tube Institute – http://www.steeltubeinstitute.org
- World Steel Association – http://www.worldsteel.org
HSS Engineering References
- Engineering Toolbox – http://www.engineeringtoolbox.com/square-hollow-structural-sections-hss-…
- HSS Sectional Properties Calculator – http://www.amesweb.info/SectionalPropertiesTabs/SectionalPropertiesHollo…
Members-Only Engineering References
- Steel Tube Institute – http://steeltubeinstitute.org/hss/design-aids/
- AISC – http://www.aisc.org