§ Standards
Status
CURRENT
Last verified
2026-09-06
AISC · STANDARD
AISC 303
Code of Standard Practice for Steel Buildings and Bridges
Overview
What this standard covers
Defines the customary trade practices: scope of supply, drawing responsibilities, mill and fabrication tolerances, and erection tolerances for the structural steel frame.
Defines the customary trade practices: scope of supply, drawing responsibilities, mill and fabrication tolerances, and erection tolerances for the structural steel frame.
Who uses it
Fabricators, checkers and inspectors setting shop requirements, tolerances and execution class.
Details
Reference data
- Standard number
- AISC 303
- Title
- Code of Standard Practice for Steel Buildings and Bridges
- Organisation
- AISC
- Country
- United States
- Region
- United States
- Subject
- Fabrication
- Subcategory
- Commercial practice
- Type
- STANDARD
- Application
- Contractual
- Availability
- Free
- Status
- CURRENT
- Roles
- fabrication standard
- Last verified
- 2026-09-06
Official source: aisc.org
Related
Standards used alongside this one
- AISC 360
Specification for Structural Steel Buildings
The US design specification for steel buildings, covering LRFD and ASD member and connection design; adopted by reference in the International Building Code.
United StatesDesign codesCURRENTFree
- BS EN 1090-2
Execution of steel structures — Technical requirements for steel structures
The central execution standard for UK and European steelwork: execution classes EXC1 to EXC4, constituent products, cutting and holing, welding, bolting, erection and geometrical tolerances.
United KingdomFabricationCURRENTPaid
- EN 1090-2
Execution of steel structures — Technical requirements
The harmonised execution standard applied across the EU, defining execution classes and the fabrication, welding, bolting and erection requirements attached to each.
European UnionFabricationCURRENTPaid
- GB 50205
Standard for Acceptance of Construction Quality of Steel Structures
China's execution and acceptance standard for steel structures — the counterpart to EN 1090-2 — covering fabrication, erection and inspection acceptance.
ChinaFabricationCURRENTPaid
- IS 7215
Tolerances for Fabrication of Steel Structures
Permitted fabrication tolerances for Indian structural steelwork — the counterpart to the tolerance annexes of EN 1090-2.
IndiaFabricationCURRENTPaid
- NSSS
National Structural Steelwork Specification for Building Construction
The UK industry model specification that sits alongside EN 1090-2 and is commonly called up in contracts to define fabrication and erection duties.
United KingdomFabricationCURRENTPaid
Sourcing, review and use
Status
Editorial reference information compiled and maintained by the StructuralSteel.ai team. It is not a design certificate and is not issued under an engineer's seal.
Last reviewed
Calculations
Any figures produced on this page are indicative estimates for early sizing and comparison only — they are not engineered design outputs.
References
Final member selection, loading, connection design, fire design, fabrication and compliance must be verified for your specific project by a suitably qualified structural engineer. Standards are revised; check the edition in force where the work is built.
Verification
StructuralSteel.ai provides technical reference information and links to authoritative sources. Project specifications, applicable legislation, current standards editions and requirements of the responsible engineer or authority should always be verified before fabrication or supply.