Home
Back
Formula Used:
| From: | To: |
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 represents the largest diameter of the screw thread.
The calculator uses the formula:
Where:
Explanation: The formula calculates the major diameter by adding 75% of the fundamental triangle height to the pitch diameter of the external thread.
Details: Accurate calculation of major diameter is crucial for proper thread design, manufacturing tolerance determination, and ensuring proper fit and function in threaded assemblies.
Tips: Enter pitch diameter and height of fundamental triangle in meters. Both values must be non-negative numbers for valid calculation.
Q1: What is the significance of the 0.75 factor in the formula?
A: The 0.75 factor represents the relationship between the fundamental triangle height and the additional diameter needed to reach the major diameter from the pitch diameter.
Q2: How does major diameter differ from minor diameter?
A: Major diameter is the largest diameter of the thread, while minor diameter is the smallest diameter of the thread profile.
Q3: What units should be used for input values?
A: The calculator uses meters for all measurements, though the same formula applies to any consistent unit system.
Q4: When is this calculation particularly important?
A: This calculation is essential in precision engineering, aerospace applications, and any scenario requiring exact thread specifications.
Q5: Are there limitations to this formula?
A: This formula provides a standard calculation, but actual thread dimensions may vary based on specific thread standards and manufacturing tolerances.