Threads / Geometry calculator
Keep units explicit.
Separate geometry from limits.
Enter a nominal diameter and pitch. The result shows the equations and assumptions; it is not an inspection or strength calculation.
Calculation basis
H follows from the equilateral 60° triangle. The stated pitch-diameter offset defines the basic model; no class allowance is applied. One inch is exactly 25.4 mm. These are calculated model dimensions, not transcribed standard limit values.
Metric pitch is accepted directly in millimetres. Changing units does not apply a different tensile-area coefficient: this calculator does not calculate stress area.
Read the thread diameter fields
Separate pitch diameter from minor diameter before using a basic-geometry result or consulting tolerance limits.