1. What is Metric Thread Calculation?

The metric thread calculation determines the major diameter of a screw thread based on its minor diameter and pitch. This is essential for manufacturing and engineering applications where precise thread measurements are required.

2. How Does the Calculator Work?

The calculator uses the metric thread formula:

Where:

• Major Diameter — Largest diameter of the thread (mm)
• Minor Diameter — Smallest diameter of the thread (mm)
• Pitch — Distance between thread crests (mm)
• 1.22687 — Constant factor for metric threads

Explanation: The formula accounts for the geometric relationship between the thread's major and minor diameters and its pitch in metric measurement systems.

3. Importance of Thread Calculations

Details: Accurate thread calculations are crucial for proper fastener selection, ensuring mechanical compatibility, and maintaining structural integrity in assemblies.

4. Using the Calculator

Tips: Enter minor diameter and pitch in millimeters. Both values must be positive numbers. The calculator will compute the major diameter.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between major and minor diameter?
A: Major diameter is the largest diameter of the thread, while minor diameter is the smallest diameter at the root of the thread.

Q2: How is pitch measured in metric threads?
A: Pitch is the distance in millimeters between corresponding points on adjacent threads.

Q3: Does this formula work for all metric thread types?
A: This formula works for standard ISO metric threads. Special thread forms may require different calculations.

Q4: What's the significance of the 1.22687 constant?
A: This constant represents the geometric relationship between the thread's pitch and its height in the ISO metric thread standard.

Q5: Can I use this for internal threads?
A: The formula works similarly for internal threads, but you'll need to consider the internal thread's dimensions.