Links to organizations related to fasteners and steel construction
http://www.aisc.org – American Institute of Steel Construction
http://www.cagc.org/ – The Carolinas Association of General Contractors
http://www.boltcouncil.org – Research Council on Structural Connections
http://www.astm.org – search and download ASTM specifications
http://www.nfda-fastener.org – National Fastener Distributors Association
http://www.thesefa.com – Southeastern Fastener Association
http://www.stafda.org – Specialty Tools & Fasteners Distributors Association