What is the tightening torque for a nut?

The torque for a nut is generally associated with factors such as the specification of the bolt, material, thread type, and application environment. Below is a common nut torque reference table applicable to dry conditions for carbon steel bolts and corresponding nuts of grade 8.8. Please note that in actual use, adjustments must be made based on specific circumstances, such as lubrication conditions and material properties.

Precautions:

1. Lubrication Conditions: The torque values for lubricated nuts and bolts are typically lower than those under dry conditions; hence the data in the table applies to dry conditions. If a lubricant is used, the torque value should be reduced, usually by approximately 20-30%.
2. Material and Grade: The data in the table is suitable for carbon steel bolts of grade 8.8. If the bolt or nut material or grade differs (e.g., grade 10.9 or stainless steel), refer to the corresponding torque standards or manufacturer-provided data.
3. Application Environment: High temperatures, corrosive environments, or other special conditions may influence the selection of nut torque.
4. Precision of Installation Tools: Ensure the use of calibrated torque wrenches to achieve accurate torque values.
5. This table provides common nut torque data. In practical applications, the precise torque should be determined according to specific engineering requirements or the manufacturer's recommended values.

Will you use bolts and nuts in your next engineering project? And if you have any questions about how to choose the right bolts or nuts for your needs, don't hesitate to reach out.
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