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Metric tap drill diameter calculator

Metric tap drill diameter calculator

Estimate metric tap drill diameter from a standard selection or custom diameter and pitch; table values appear only when maintained. Inputs, formula and interpretation are separated so you can verify the result before using it for a configurable part.

Calculate

Estimate metric tap drill diameter from a standard selection or custom diameter and pitch; table values appear only when maintained
Inputs: Nominal diameter
Inputs: Thread pitch

Schematic illustration – not to scale.

Metric tap drill diameter calculatorSchematic illustration – not to scale. Nominal diameter, Thread pitch tap drill ≈ nominal diameter − pitchTPI / p

Schematic illustration – not to scale.

Formula

tap drill ≈ nominal diameter − pitch

Thread values are calculation aids. Metric and Unified threads are not automatically compatible.

Step by step

  1. Enter the measured or planned values with their units.
  2. Check the formula with substituted values in the result area.
  3. Copy the parameters or open a related product for configuration.

Complete worked example

Worked example with typical workshop values: insert the inputs, apply tap drill ≈ nominal diameter − pitch and compare the result with the reference table.

23060 mm
14040 mm
32060 mm

Assumptions and limitations

  • Thread values are calculation aids. Metric and Unified threads are not automatically compatible.

Common input mistakes

  • Decimal comma and point are accepted, but do not type units into numeric fields.
  • For gears, the tooth count must be a whole number in practice.

FAQ

Are metric and UNC/UNF threads interchangeable?

No. Similar diameters do not mean profile, pitch and tolerance are compatible.

Can I manufacture directly from this result?

Use the value as a calculation and configuration aid. Loaded or standards-critical parts need engineering review.

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Related calculators

Thread pitch and TPI calculatorConvert TPI to metric thread pitch or pitch to TPI, including thread counts over 10 mm and one inch.Millimetre to inch thread calculatorConvert metric thread diameter and pitch to decimal inch, fractional inch and TPI; similar Unified sizes are only geometric references.Inch to millimetre thread calculatorConvert inch nominal diameter and TPI to millimetres and metric pitch, then compare nearby metric sizes without claiming compatibility.Metric to UNC/UNF thread comparisonCompare metric threads with nearby UNC and UNF sizes by diameter and pitch. The table shows deviations, not interchangeability.Internal and external thread dimensions calculatorCalculate simplified basic dimensions for internal and external threads. Results are approximations and do not replace tolerance tables.