1. What is the Major Diameter of External Thread?

The Major Diameter of External Thread is the diameter of the imaginary co-axial cylinder that just touches the crest of an external thread. It is the largest diameter of a screw thread.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Major Diameter of External Thread (m)
• \( d_p \) — Pitch Diameter of External Thread (m)
• \( p \) — Pitch of Threads (m)

Explanation: This formula calculates the major diameter by adding 0.650 times the pitch to the pitch diameter of the external thread.

3. Importance of Major Diameter Calculation

Details: Accurate calculation of major diameter is crucial for proper thread design, manufacturing, and ensuring compatibility between threaded components.

4. Using the Calculator

Tips: Enter pitch diameter and pitch values in meters. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between major diameter and pitch diameter?
A: Major diameter is the largest diameter of the thread, while pitch diameter is the diameter where the thread width equals the space between threads.

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

Q3: Can this formula be used for all thread types?
A: This formula is specifically designed for standard external 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 manufactured threads may have tolerances and variations.