Home
Back
Metric Screw Force Formula:
| From: | To: |
The metric screw force formula calculates the axial force generated by a screw or bolt when torque is applied. This is essential for determining clamping force in mechanical assemblies and ensuring proper fastening.
The calculator uses the metric screw force formula:
Where:
Explanation: The formula calculates the axial force generated based on the applied torque, screw diameter, and a friction coefficient that accounts for thread geometry and friction conditions.
Details: Accurate screw force calculation is crucial for proper fastener selection, ensuring adequate clamping force, preventing joint failure, and maintaining structural integrity in mechanical assemblies.
Tips: Enter torque in Nm, coefficient (typically 0.2 for standard conditions), and diameter in meters. All values must be positive numbers greater than zero.
Q1: What is a typical value for coefficient K?
A: For standard metric screws, K is typically around 0.2, but can vary from 0.15 to 0.3 depending on thread condition, lubrication, and material.
Q2: Why is diameter important in the calculation?
A: Diameter affects the lever arm and therefore the mechanical advantage. Larger diameters require less torque to achieve the same force.
Q3: Can this formula be used for imperial units?
A: Yes, but units must be consistent. Convert all measurements to compatible units (e.g., lb-ft for torque and inches for diameter).
Q4: What factors affect the coefficient K?
A: Thread pitch, surface finish, lubrication, material properties, and thread engagement all influence the friction coefficient.
Q5: How accurate is this calculation?
A: This provides a theoretical estimate. Actual force may vary due to manufacturing tolerances, surface conditions, and other practical factors.