1. What is 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)
• \( Dc \) — Minor Diameter of Internal Thread (m)
• \( H \) — Height of Fundamental Triangle (m)

Explanation: This formula calculates the major diameter by adding 1.25 times the height of the fundamental triangle to the minor diameter of the internal thread.

3. Importance of Major Diameter Calculation

Details: Accurate calculation of major diameter is crucial for proper thread design, manufacturing, and ensuring compatibility with mating threads in mechanical assemblies.

4. Using the Calculator

Tips: Enter minor diameter and height of fundamental triangle in meters. Both values must be valid (≥0).

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the 1.25 factor?
A: The 1.25 factor accounts for the specific geometric relationship between the minor diameter and the height of the fundamental triangle in thread design.

Q2: How accurate is this calculation?
A: This calculation provides theoretical values based on standard thread geometry formulas. Actual manufacturing tolerances may vary.

Q3: Can this formula be used for all thread types?
A: This formula is specifically designed for standard internal threads. Different thread standards may have variations in their calculation methods.

Q4: What units should be used for input values?
A: The calculator uses meters for both input values, but the same formula applies to any consistent unit system.

Q5: Why is the height of fundamental triangle important?
A: The height of fundamental triangle determines the basic thread form and affects the strength and engagement characteristics of the thread.