Every fabricator/erector listing in this directory is seeded directly from AISC's own Certified Company Search - here's what the certification categories and endorsements shown on those listings actually mean. Always verify a company's current certification status directly through AISC rather than relying on any directory, including this one.
The core certification for structural steel fabricators serving the building market - covers a shop's quality management system, personnel qualifications, and welding procedures for fabricating structural steel framing. The most common certification held by fabricators in this directory.
A tiered certification for steel bridge fabrication, each tier covering more complex bridge types and fabrication methods - Simple for the most straightforward girder bridges, up through Advanced for the most demanding work.
A separate certification from fabrication, covering the field side of the business - setting and connecting structural steel on site. Many companies in this directory hold both an Erector certification and a Fabricator certification; some hold only one.
An add-on to a base Erector certification specific to bridge erection work, layered on top of the general erection certification rather than replacing it.
For fabricators working on structures in higher seismic-risk regions - covers the additional quality-control requirements for seismic-force-resisting systems like moment frames and braced frames.
For fabricating fracture-critical members - steel members whose failure could cause a broader structural collapse - common in certain bridge and hydraulic-structure designs, and generally requiring extra weld inspection and documentation rigor.
An add-on for fabricators who also produce or install metal roof/floor deck alongside structural steel framing.
Endorsement tiers for shops that also apply protective coatings, generally graduated by how exposed the finished structure will be to weather and corrosion once installed.
A specialized certification for steel fabricated for hydraulic structures - dam gates, lock components, and similar water-control infrastructure - distinct from typical building or bridge fabrication work.
Certification for companies producing ancillary highway steel components (sign structures, guardrail, and similar), separate from the main structural fabricator/erector categories.