How does the countersink calculator work?
Countersink cone geometry, distinct from thread pitch, straight taper and spotface depth. Included angle belongs to the full cone. Removed volume excludes the cylindrical hole volume already present.
Which measurements do you need for countersink?
Included angle belongs to the full cone. Removed volume excludes the cylindrical hole volume already present. Measure the actual installed geometry or quoted quantity rather than substituting a nominal product size.
Which formula calculates countersink?
Depth = (mouth diameter − hole diameter) / (2 × tan(included angle / 2)).
What does a countersink worked example show?
A 10 mm mouth over a 6 mm hole with a 90° included angle gives 2 mm axial countersink depth.
Which units apply to countersink?
Use the labeled units in the input reference below. The Imperial / Metric selection converts fields with dynamic unit labels. Fixed-unit fields retain the units printed in their labels.
Leave optional inputs blank when unavailable. Required fields and paired data are checked before a result is displayed.
| Input | Units | When used |
|---|---|---|
| Through-hole diameter (mm) | as labeled | all modes |
| Included countersink angle (degrees) | as labeled | all modes |
| Countersink mouth diameter (mm) | as labeled | solve:depth |
| Countersink axial depth (mm) | as labeled | solve:diameter |
| Identical holes | as labeled | all modes |
Which assumptions change the countersink result?
Countersink cone geometry, distinct from thread pitch, straight taper and spotface depth. Included angle belongs to the full cone. Removed volume excludes the cylindrical hole volume already present.
How should you check the countersink estimate?
Included angle belongs to the full cone. Removed volume excludes the cylindrical hole volume already present. Keep measured values separate from any extra allowance or quoted price. Check the resulting unit and rounding before ordering or using the result.
How can you compare countersink scenarios?
Calculate one baseline and add it to comparison. Change one measured input or verified product value and calculate again. Comparison keeps the itemized inputs and results so the changed assumption remains visible.
How can you save or share the countersink result?
After calculation, copy or share the result, download the worksheet or print the inputs and result. Embed and citation controls are in the header. Clear changes removes the current worksheet, and a browser refresh opens blank numeric inputs.
Which related tools help with countersink?
Use Recessed Lighting Calculator, True Position Calculator, Box Fill Calculator for related project quantities. Each tool has its own scope; avoid transferring a result without checking its unit and assumptions.
