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Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Access free engineering resources from IEE Business—covering power design, circuit layout, equipment selection, and troubleshooting. Expert-developed guides help engineers, procurement, and project teams make better decisions. Stay ahead on smart grids, renewables, efficiency, and AI tools. Improve reliability, reduce downtime, and enhance outcomes with real-world solutions. Explore our knowledge hub today.

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GIS Bolt Tightening Torque Standards by Material & Size

GIS (Gas-Insulated Metal-Enclosed Switchgear) contains numerous bolted and screwed connections, and the tightening torque varies depending on bolt material, size, and application. The recommended tightening torque values are listed below for reference:Table 1 Tightening Torque Values for Bolts of Different Materials and Sizes (N·m / kgf·cm) Thread Diameter (mm) Q235 (A3) Cast Insulator 45 Steel Chrome-Molybdenum Steel Stainless Steel M6 5.88/60 3.92/40 12.3/125 19.6/

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10/24/2025

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