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Clamp Force Formula:
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The clamp force formula calculates the axial force generated by a bolt when a specific torque is applied. This is essential in engineering applications where proper clamping force is critical for joint integrity and safety.
The calculator uses the clamp force formula:
Where:
Explanation: The formula relates the applied torque to the resulting clamp force, accounting for the bolt diameter and friction through the torque coefficient.
Details: Accurate clamp force calculation is crucial for ensuring proper joint sealing, preventing bolt failure, maintaining structural integrity, and avoiding loosening under vibration or thermal cycling.
Tips: Enter torque in Nm, torque coefficient (typically 0.15-0.25 for standard conditions), and bolt diameter in meters. All values must be positive and non-zero.
Q1: What is a typical value for the torque coefficient K?
A: For standard unlubricated bolts, K is typically between 0.15-0.25. Lubricated bolts may have values as low as 0.10.
Q2: Why is bolt diameter important in this calculation?
A: Bolt diameter directly affects the leverage and thus the conversion of torque to axial force. Larger diameters require more torque to achieve the same clamp force.
Q3: How accurate is this formula in real applications?
A: While the formula provides a good estimate, actual clamp force can vary due to factors like surface finish, lubrication, thread condition, and measurement accuracy.
Q4: Can this formula be used for metric and imperial units?
A: Yes, but all units must be consistent. Convert all measurements to the same system (SI units recommended: Nm for torque, m for diameter, N for force).
Q5: What affects the torque coefficient value?
A: Surface finish, lubrication, thread pitch, material combination, and washers all influence the torque coefficient value.