Which standard addresses tolerances for fabrication and erection of structural steel?

• A. AWS D1.1
• B. ISO 9001
• C. ASTM A36
• D. AISC Code of Standard Practice (AISC 303) and related tolerances in the AISC Steel Construction Manual

Answer: (D)

Tolerances for fabrication and erection of structural steel are defined by the AISC Code of Standard Practice (AISC 303) and the tolerances in the AISC Steel Construction Manual. These documents lay out the permissible deviations in dimensions, hole locations, alignment, camber, twist, and other fit-up factors, ensuring parts fabricated in the shop and erected in the field can assemble correctly and safely.

The other standards tackle different aspects: AWS D1.1 focuses on welding requirements and workmanship related to welds; ISO 9001 covers quality management systems rather than specific fabrication tolerances; and ASTM A36 is a material specification for structural steel shapes, not fabrication or erection tolerances.