DIATEST GmbH, founded by Mr. Hermann Költgen in 1948, is headquartered in Darmstadt, with customers worldwide.

Manufacture high-precision aperture gauges with accuracy up to 0.001mm. Skilled precision engineering technicians and engineering expertise ensure high-quality standards.

Internal Tooth Gage

Internal Tooth Measuring Instrument (IV) - Measurement Rod Spacing

Measure internal and external teeth, as well as their taper and ellipticity. Suitable for straight or helical teeth, even or odd teeth.

Low wear

User-friendly

Cost-effective

High measurement accuracy, wide measurement range.

With varying moduli, the measuring balls can be freely replaced.

The ball material is tungsten steel, ensuring the high lifespan of the measuring instrument.

Measurement depth exceeds 3000mm.

Application Range: Pitch of internal teeth Mi = 3.5–333mm (0.1380" to 13.1102")

The internal tooth bar spacing Mi starts at 9.3mm (T-ZM3), with the ball being threaded and replaceable.

Measurement range varies according to specifications from 0.6mm to 3mm (0.0236" to 0.1181").

Structure, two-lobed, and internal diameter gauge system, identical

Available in custom-sized BMD-IV (from guide body diameter Φ10mm) plug gauge style probe, suitable for batch inspection.