Precision counts – measure drill diameters and threads correctly

Why trade fairs are so important

When drilling and tapping, a tenth of a millimeter often makes the difference between success and failure.
Precision is particularly crucial for metal parts so that threads fit exactly and screws grip securely.

The most important measuring tools

Vernier caliper: For bore diameter, depth and external dimensions.
Thread gauge: For determining thread pitch and profile.
Micrometer: For exact outside diameters or shafts.
Limit plug gauges: Industry standard for checking internal threads.

Avoid typical mistakes

Measuring device not zeroed → incorrect values
Workpiece not cleaned → chips or oil distort the result
Incorrect angle when measuring → inaccuracy

Practical tip: Check core hole dimensions

Before threading, the core hole size should be correct.
Example:

For M6 → 5.0 mm bore
For M8 → 6.8 mm bore
For M10 → 8.5 mm bore

This is the only way the tap will grip evenly and cut cleanly.

Measuring is not a side step, but part of the craft.
With a thread gauge, caliper and a little practice you can achieve precise results that fit and last.