Special tool steel is used to manufacture testing pins.
The steel is hardened, grounded and lapped.
Testing Pins are used for inspecting tolerances and the angularity of bores, as well as for measuring distances of bores.
Further more testing pins can be used as setting standards, for the measurement of prisms, grooves, interlocks etc.

Testing Pin in Plastic Industry by KDP

Measuring Technology: Testing pin made out of special tool steel

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.