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 external thread and 1.227 times the pitch of the threads. 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)
• \( d_c \) — Minor Diameter of External Thread (m)
• \( p \) — Pitch of Threads (m)

Explanation: This formula calculates the major diameter of an internal thread based on the minor diameter of the corresponding external thread and the pitch of the threads.

3. Importance of Major Diameter Calculation

Details: Accurate calculation of major diameter is crucial for proper thread fitting, ensuring mechanical compatibility, and maintaining structural integrity in threaded connections.

4. Using the Calculator

Tips: Enter minor diameter of external thread and pitch of threads in meters. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units should be used for input values?
A: The calculator uses meters for both minor diameter and pitch inputs. Convert from other units if necessary.

Q2: Why is the coefficient 1.227 used in the formula?
A: The coefficient 1.227 is derived from thread geometry standards and represents the relationship between pitch and the height of the fundamental triangle.

Q3: Can this calculator be used for all thread types?
A: This formula is specifically designed for standard metric threads. Other thread types may require different calculations.

Q4: What is the significance of major diameter in thread design?
A: Major diameter determines the outer size of the internal thread and is critical for proper mating with external threads.

Q5: How accurate is this calculation?
A: The calculation provides theoretical values based on standard formulas. Actual manufacturing tolerances may cause slight variations.