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The Minor Diameter of External Thread is the diameter of the imaginary co-axial cylinder that just touches the base of an external thread. It represents the smallest diameter of the threaded portion.
The calculator uses the formula:
Where:
Explanation: The formula calculates the minor diameter by subtracting 1.227 times the pitch from the major diameter of the internal thread.
Details: Accurate calculation of minor diameter is crucial for proper thread design, manufacturing tolerance determination, and ensuring proper thread engagement and strength in mechanical assemblies.
Tips: Enter the major diameter of internal thread and pitch of threads in meters. Both values must be positive numbers.
Q1: What is the significance of the 1.227 factor?
A: The 1.227 factor is derived from thread geometry standards and accounts for the relationship between pitch and thread depth in standardized thread systems.
Q2: Can this formula be used for all thread types?
A: This formula is specifically designed for standardized thread systems. Always verify its applicability for specific thread standards and types.
Q3: How accurate is this calculation?
A: The calculation provides theoretical values based on standard formulas. Actual manufacturing tolerances may result in slight variations.
Q4: What units should be used for input values?
A: The calculator uses meters as the default unit. Ensure consistent units for both major diameter and pitch values.
Q5: How does minor diameter affect thread strength?
A: The minor diameter determines the cross-sectional area of the thread root, which directly affects the tensile strength and load-bearing capacity of the threaded connection.