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Thread Clamping Force Formula:
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Thread clamping force refers to the compressive force generated when a threaded fastener (such as a bolt or screw) is tightened. This force is crucial for maintaining joint integrity and preventing loosening in mechanical assemblies.
The calculator uses the thread clamping force formula:
Where:
Explanation: The formula calculates the axial force generated in a bolt when torque is applied, using a standard coefficient of 0.2 for steel threads.
Details: Proper clamping force ensures joint integrity, prevents fastener loosening due to vibration, and maintains seal pressure in gasketed joints. Insufficient force can lead to joint failure, while excessive force may damage threads or components.
Tips: Enter torque in Newton-meters (Nm) and diameter in meters (m). Ensure values are positive and diameter is greater than zero for accurate calculations.
Q1: Why is the coefficient 0.2 used in the formula?
A: The 0.2 coefficient represents a typical friction factor for steel threads, accounting for both thread friction and underhead friction.
Q2: Does this formula work for all thread types?
A: This formula provides a general estimation for standard metric and imperial threads in steel applications. Special thread forms or materials may require different coefficients.
Q3: How accurate is this calculation?
A: This provides an estimation. Actual clamping force can vary due to factors like lubrication, surface finish, and thread condition.
Q4: What units should I use?
A: Use Newton-meters (Nm) for torque and meters (m) for diameter. Convert imperial units if necessary (1 lb-ft = 1.35582 Nm, 1 inch = 0.0254 m).
Q5: When should I use a different coefficient?
A: Different coefficients may be needed for lubricated threads (lower coefficient) or when using different materials like stainless steel or brass.