40-50mm Three-Point Internal Micrometer With Measurement Drum Scale, IP65 - Metav IndustryLine

Take advantage of the instrument's combination of three-point internal contact, a digital display with ABS/INC/UNIT functions, and workshop-grade IP65 protection for consistent, repeatable inspection of blind-hole bores. Order the unit through Metav Werkzeuge or contact our consultants for tailored technical advice and delivery coordination.

Three-point Internal Micrometer M312.238.M — Digital internal micrometer with IP65 protection

The Three-point Internal Micrometer M312.238.M is a digital precision instrument designed for reliable measurement of blind-hole diameters in mechanical and mould-making applications, covering the 40–50 mm range.

• Three-point internal measurement for blind holes
• Digital display with ON/OFF/SET and ABS/INC/UNIT
• IP65 protection for workshop environments
• Accuracy ±0.005 mm, suitable for precision work

Consistent centring and high repeatability for blind-hole inspection

The three-point contact geometry combined with a measuring drum with scale ensures stable, self-centring engagement in blind holes, reducing eccentricity and operator variance. With a reading and accuracy of 0.005 mm, this instrument delivers the repeatability required for quality control and assembly checks in toolmaking and small-series production. The mechanical design is optimised to convert precise spindle rotation into reproducible radial positioning, which shortens setup times and reduces scrap rates.

Workshop-hardy digital handling and clear measurement readout

Equipped with a robust digital display (ON/OFF/SET and ABS/INC/UNIT functions) and sealed to IP65, the micrometer withstands coolant spray and dusty environments while keeping measurements readable and reliable. The compact instrument is supplied with a setting ring and an extension (150×Ø23,4) for access to recessed features, so calibration and adaptation to specific bores are straightforward. The solid feel of the instrument supports confident handling during repetitive checks, increasing throughput without sacrificing precision.

Integration into inspection routines and normative compliance

Classified in the micro measuring range (max. 50 mm), this device is suitable where short jaws and high stiffness are needed—for example, watchmaking, precision components and mould cavities. It is manufactured to DIN 863 standards and offers a clear path to digital workflows via data output RB 4.1 for downstream logging or SPC integration. The combination of a tactile measuring drum and an electronic readout provides both the trusted mechanical feedback inspectors expect and the efficiency of immediate digital capture.

Contact Metav Werkzeuge for detailed specification matching, delivery options and expert advice on how the Metav IndustryLine three-point internal micrometer can be integrated into existing inspection procedures — phone +49 2822 7131930 or eMail info@metav-werkzeuge.com

Technical data

• SKU: M312.238.M
• GTIN: 4054469162393
• Brand: Metav IndustryLine

Facts

• Measuring range: 40–50 mm
• Resolution / reading: 0.005 mm
• Accuracy: ±0.005 mm
• Weight: 2.6 kg
• Protection class: IP 65

Special features

• Three-point internal contact for blind holes
• Measuring drum with scale
• Digital display with ON/OFF/SET and ABS/INC/UNIT
• Includes setting ring and extension (150×Ø23,4)
• Compliant with DIN 863
• Data output: RB 4.1

FAQ

How accurate is the micrometer for internal diameters?
The instrument achieves an accuracy of ±0.005 mm, with a reading of 0.005 mm, making it suitable for high-precision internal diameter checks.

Can this device measure blind-hole bores?
Yes, the three-point contact design is intended for blind-hole measurement and is supplied with an extension to reach recessed bores.

Is the display suitable for harsh workshop conditions?
The digital readout is protected to IP65, offering resistance to dust and splashing fluids typically encountered in workshops.

Does the micrometer support digital data transfer?
The device provides a RB 4.1 data output for connection to data loggers or inspection software, facilitating traceable measurement records.

Which standards does the instrument comply with?
Manufacture and functional design conform to DIN 863, ensuring compatibility with common workshop and inspection requirements.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com