Thread Repair Tools

Pitch Gauges and Size Identification

Use a pitch gauge to compare thread spacing. Pair that result with a diameter check and the applicable thread standard before choosing a tool or insert.

What to check before ordering

Compare metric pitch in millimeters with inch markings in threads per inch on their own scales. For a mixed gauge, look up the actual leaf markings rather than relying on the total leaf count. The size designations in the inch and metric kit tables show why one diameter can lead to several distinct pitch choices.

Read the scale and profile

An inch TPI count and a metric pitch measurement use different conventions. A Whitworth leaf and a Unified leaf can also differ in form at the same count.

Check the list of leaves

A range lists the endpoints. Check the individual marked pitches and use a separate diameter measurement to identify the complete thread designation.

Compare documented examples

Manufacturer references

Frequently asked questions

Does a pitch gauge give the nominal diameter?

Its leaves compare spacing. Use a separate documented diameter check and the correct thread standard to identify the full designation.

What if the damaged thread gives an unclear reading?

Identify it from an undamaged matching part or from the equipment documentation. Wait until the pitch and size agree before ordering a repair tool.

Buying guides