Thread Dimensions Calculator
Estimate basic 60-degree ISO metric or unified thread geometry. This is a basic-profile calculator; production tolerances require the selected thread standard and class.
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Enter machining data
Default values are examples. Replace them with your actual setup data.
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Formula and engineering notes
Formula / logic
For a 60° ISO/Unified basic profile: H = √3/2 × P = 0.866025P; basic pitch diameter d2/D2 = D − 0.649519P; basic minor diameter d1/D1 = D − 1.082532P. External root diameter d3 may be estimated as D − 1.226869P before applying class tolerances.
For a 60° ISO/Unified basic profile: H = √3/2 × P = 0.866025P; basic pitch diameter d2/D2 = D − 0.649519P; basic minor diameter d1/D1 = D − 1.082532P. External root diameter d3 may be estimated as D − 1.226869P before applying class tolerances.
Engineering disclaimer: these tools are for estimating and planning. Verify production parameters with toolmaker catalogs, machine limits, material data, and applicable standards.
Frequently asked questions
Can this result be used directly on a CNC machine?
Use it as a starting value only. Check the tool manufacturer data, machine limits, workholding, coolant and material condition before production.
Which units does the calculator support?
The calculator shows the units beside each input. Select metric or inch units where the page provides a unit-system control.
Why can shop results differ from the calculation?
Tool geometry, coating, runout, rigidity, chip evacuation, material hardness and machine power can change the practical result.