Engineering standards and codes form the backbone of safe, reliable, and interoperable engineering practice. ToolFusion provides curated references to major international standards organized by engineering field. Each standard link directs you to the relevant engineering network where standards are applied in calculators and knowledge articles.

## Major International Standards **ISO (International Organization for Standardization):** ISO 9001 Quality Management, ISO 14001 Environmental Management, ISO 45001 Occupational Health and Safety, ISO 50001 Energy Management. Technical standards: ISO 2768 General Tolerances, ISO 286 GPS Limits and Fits, ISO 1101 Geometrical Tolerancing. **ASTM International:** ASTM A36 Carbon Steel, ASTM A572 High-Strength Steel, ASTM A106 Seamless Pipe, ASTM D638 Tensile Properties of Plastics, ASTM E8 Tension Testing of Metallic Materials, ASTM G48 Pitting and Crevice Corrosion. **ASME (American Society of Mechanical Engineers):** ASME BPVC Boiler and Pressure Vessel Code, ASME B31.1 Power Piping, ASME B31.3 Process Piping, ASME B31.8 Gas Transmission Pipelines, ASME B16.5 Pipe Flanges and Flanged Fittings. **IEEE (Institute of Electrical and Electronics Engineers):** IEEE 1584 Arc Flash Hazard, IEEE C37.2 Standard for Switchgear, IEEE 519 Harmonic Control, IEEE 80 Grounding, IEEE 1159 Power Quality Monitoring, IEEE 1547 Interconnection of Distributed Resources. **IEC (International Electrotechnical Commission):** IEC 60228 Conductors of Insulated Cables, IEC 60364 Low-Voltage Electrical Installations, IEC 60947 Low-Voltage Switchgear, IEC 62271 High-Voltage Switchgear, IEC 61439 Low-Voltage Switchgear Assemblies. **API (American Petroleum Institute):** API 5L Line Pipe, API 6D Pipeline Valves, API 610 Centrifugal Pumps, API 650 Welded Tanks, API 686 Machinery Installation, API RP 520 Sizing of Pressure Relief Valves.