1. What is Screw Thread Stripping Calculation?

The screw thread stripping calculation determines the force required to strip threads from a screw or tapped hole. This is important for ensuring mechanical fasteners can withstand expected loads without failure.

2. How Does the Calculator Work?

The calculator uses the stripping force formula:

Where:

• \( F \) — Stripping force (N)
• \( d \) — Diameter of the screw thread (m)
• \( L \) — Length of thread engagement (m)
• \( \tau \) — Shear stress of the material (Pa)

Explanation: The formula calculates the force required to shear the threads based on the material properties and thread geometry.

3. Importance of Stripping Force Calculation

Details: Accurate stripping force calculation is crucial for designing reliable threaded connections, preventing mechanical failures, and ensuring safety in mechanical assemblies.

4. Using the Calculator

Tips: Enter diameter and length in meters, shear stress in Pascals. All values must be positive and valid for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is thread stripping?
A: Thread stripping occurs when the threads of a screw or tapped hole shear off under excessive load, causing the fastener to fail.

Q2: How does material affect stripping force?
A: Materials with higher shear strength (τ) require greater force to strip threads. Different materials have different shear strength properties.

Q3: What is the safety factor for thread stripping?
A: Typically, a safety factor of 2-3 is applied to the calculated stripping force to account for variations in material properties and manufacturing tolerances.

Q4: Does thread pitch affect stripping force?
A: While the basic formula doesn't include pitch, finer threads generally have higher stripping strength due to increased thread engagement area.

Q5: When should this calculation be used?
A: This calculation is essential during mechanical design phase to ensure threaded fasteners can withstand expected operational loads without failure.