1. What is the Major Diameter of Internal Thread?

The Major Diameter of Internal Thread is defined as the sum of minor diameter of the internal thread and 1.25 times the value of the height of the fundamental triangle. It represents the largest diameter of an internal thread.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D \) — Major Diameter of Internal Thread (m)
• \( D_p \) — Pitch Diameter of Internal Thread (m)
• \( p \) — Pitch of Threads (m)

Explanation: This formula calculates the major diameter of an internal thread based on its pitch diameter and thread pitch, using a constant factor of 0.650.

3. Importance of Thread Measurement

Details: Accurate thread measurement is crucial for proper fitting of threaded components, ensuring mechanical strength, and preventing failure in mechanical assemblies.

4. Using the Calculator

Tips: Enter pitch diameter and pitch of threads in meters. Both values must be positive numbers. The calculator will compute the major diameter of the internal thread.

5. Frequently Asked Questions (FAQ)

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

Q2: Why is the constant 0.650 used in this formula?
A: The constant 0.650 is derived from thread geometry standards and represents the relationship between pitch diameter, pitch, and major diameter.

Q3: Can this formula be used for all thread types?
A: This formula is specifically designed for standard internal threads. Different thread types may require different constants or formulas.

Q4: What units should be used for input values?
A: The calculator expects all inputs in meters. Convert from other units if necessary before calculation.

Q5: How accurate is this calculation?
A: The calculation provides theoretical values based on standard thread geometry. Actual measurements may vary slightly due to manufacturing tolerances.