75-88mm Digital Three-Point Internal Micrometer With Carbide Measuring Faces, RB6, No Setting Ring - Metav IndustryLine

Benefit from high-precision measurement, robust carbide measuring faces and a clear digital readout for reliable internal bore checks in production. Combine repeatable ±0.005 mm accuracy with blind‑hole capability and straightforward data output — order the M312.221 directly via Metav Werkzeuge or consult our specialists for technical advice.

M312.221 Digital three-point internal micrometer (75–88 mm) by Metav IndustryLine

The M312.221 is a digital three-point internal micrometer designed for precision measurement of blind-hole bores and internal diameters in workshop and production environments.

• Digital display with mm/inch and hold
• High accuracy ±0.005 mm
• Carbide measuring faces for wear resistance
• Built for blind‑hole measurements

Precise results for internal bore inspection

The three‑point measuring principle provides a stable, concentric contact in cylindrical bores: the spring‑loaded anvils expand evenly to centre on the bore, reducing eccentricity and improving repeatability. With a stated accuracy of ±0.005 mm and a display resolution of 0.001 mm, this instrument is suited to metrological tasks that require fine tolerances. The design helps to convert small hand movements into a clear numerical result, making it easier to maintain process control and reduce rework.

Clear digital handling and data transfer

The integrated digital display offers ON/OFF/SET, HOLD and quick mm/inch switching to speed measurement cycles and avoid transcription errors. Readouts at 0.001 mm resolution make small deviations visible at once. The tool also provides a RB 6 data output interface for downstream recording or process documentation, allowing measured values to be captured electronically for quality records and SPC workflows, which supports faster decision‑making on the shop floor.

Robust measuring faces and application scope

Carbide (HM) measuring faces give hard, wear‑resistant contact surfaces that maintain measurement integrity over repeated use. The instrument’s range of 75–88 mm targets medium internal diameters commonly found in components and fixtures; its capability for blind‑hole measurement makes it a practical choice where depth limits conventional probes. The construction balances rigidity with ergonomic handling to reduce operator influence on the result.

Practical benefits in production environments

Using a three‑point internal micrometer streamlines inspection of bores without complex fixturing: measurements are performed rapidly with reproducible contact geometry, which supports throughput in batch inspections. The combination of digital readout, robust carbide faces and electronic data output reduces manual entry errors, shortens inspection times and helps maintain traceable measurement records for quality assurance. Suitable for workshop use and routine quality control applications.

Choose the M312.221 from Metav IndustryLine for dependable internal bore measurement — contact Metav Werkzeuge for tailored technical guidance and swift dispatch from Emmerich.

Technical data

• SKU: M312.221
• GTIN: 4054469169187
• Manufacturer: Metav IndustryLine
• Label: Digital three-point internal measuring, 75–88 mm, RB6 with carbide measuring faces
• Eclass: 21170335
• ETIM: EC003590

Facts

• Measuring range: 75–88 mm
• Accuracy: ±0.005 mm
• Resolution (display): 0.001 mm
• Weight: 4 kg
• Tariff number: 90173000

Special features

• Carbide measuring faces (HM)
• Digital display with ON/OFF/SET, HOLD, mm/inch
• Data output: RB 6
• Suitable for blind‑hole measurements
• Category: Micrometers (Messschrauben)

FAQ

What measuring range does this instrument cover?
The instrument covers a measuring range of 75–88 mm, designed for medium internal diameters.

How precise are the results from this three‑point micrometer?
The device delivers an accuracy of ±0.005 mm with a display resolution of 0.001 mm, suitable for fine tolerance checks.

Is the tool suitable for blind‑hole measurements?
Yes, the design is specifically suitable for blind‑hole measurement and is supplied without extensions or a setting ring.

Are the measuring faces hardened for long service life?
The micrometer is fitted with carbide (HM) measuring faces, providing high wear resistance for repeated use.

What data interface is provided for process documentation?
A RB 6 data output is available to transfer measured values electronically into quality systems.

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