1. What is Screw Torque Clamping Force?

Screw torque clamping force refers to the axial force generated when torque is applied to a screw or bolt. This force is crucial in mechanical assemblies as it determines how tightly components are held together and affects the joint's integrity and performance.

2. How Does the Calculator Work?

The calculator uses the screw torque clamping force formula:

Where:

• \( F \) — Clamping force (N)
• \( T \) — Applied torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( D \) — Nominal diameter (m)

Explanation: The formula calculates the axial clamping force generated from the applied torque, considering the screw diameter and a friction-dependent coefficient.

3. Importance of Clamping Force Calculation

Details: Proper clamping force ensures joint integrity, prevents loosening under vibration, maintains seal integrity, and prevents damage to clamped components from over-tightening.

4. Using the Calculator

Tips: Enter torque in Nm, coefficient value (typically 0.15-0.25 for standard bolts), and diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for standard bolts?
A: For standard steel bolts, K typically ranges from 0.15 to 0.25, with 0.2 being a common average value.

Q2: Why does diameter affect clamping force?
A: Larger diameter screws require more torque to achieve the same clamping force due to the increased lever arm and contact area.

Q3: How does lubrication affect the calculation?
A: Lubrication reduces the K value, meaning less torque is needed to achieve the same clamping force, typically by 15-25%.

Q4: What are the risks of incorrect clamping force?
A: Under-tightening can lead to joint failure, while over-tightening can cause bolt stretching, thread stripping, or component damage.

Q5: Is this formula applicable to all thread types?
A: The formula works for standard metric and imperial threads but may need adjustment for specialized thread forms or materials.