300–325 mm Three-Point Internal Gauge For Blind Holes With Carbide Measuring Faces, Ratchet, Supplied In Case - Metav IndustryLine

Take advantage of the combination of precise three‑point internal measuring, carbide measuring faces and a ratchet stop for repeatable blind‑hole checks; order directly via Metav Werkzeuge or consult the technical team for application advice.

Three‑point internal micrometer M312.156.S — 300–325 mm, carbide faces (Metav IndustryLine)

The Three‑point internal micrometer M312.156.S is an analogue instrument designed for precise measurement of blind holes and large bores in workshop and inspection environments.

• Three‑point internal measuring principle
• Carbide measuring faces for long wear resistance
• Ratchet stop for consistent contact force
• Large bore range 300–325 mm

Reliable three‑point measurement for blind holes

The three‑point measurement system translates circumferential contact into a central diameter value, making it particularly effective for blind‑hole measurement where single‑edge probes fail to centre reliably. With a stated accuracy of 0.012 mm and a vernier reading of 0.005 mm, the instrument delivers a balance of resolution and real‑world repeatability. The inclusion of a ratchet stop helps to ensure a constant measuring force across successive readings, reducing operator‑induced variance and supporting efficient quality control routines on production lines.

Built for large‑bore inspection and robust handling

Covering a measuring range 300–325 mm and a measuring depth 140 mm, this micrometer is configured for sizeable internal diameters such as housings, flanges and large bores in machining and assembly work. The scale and vernier are matt chrome‑plated, which reduces reflections and improves legibility under workshop lighting. Carbide measuring faces provide wear resistance when used on standard ferrous and non‑ferrous materials, extending service life and maintaining accuracy between calibrations. Note that the delivery is supplied without setting ring, so plan for the necessary calibration or reference ring in your inspection setup.

Practical benefits: reproducibility, serviceability and integration

As an analogue vernier instrument it requires no batteries and offers straightforward field use with minimal maintenance; the mechanical design emphasises accessibility for inspection and calibration tasks. The robust construction suits regular handling in busy shops while carbide faces reduce wear, limiting downtime for part replacement. For procurement and traceability, the tool is offered through Metav IndustryLine and benefits from Metav’s European distribution and quality filtering in Emmerich — a combination that supports dependable supply and clear documentation for industrial customers.

Contact Metav Werkzeuge for a tailored application assessment or to procure the Metav IndustryLine three‑point internal micrometer M312.156.S directly from their Emmerich facility; phone +49 2822 7131930 or e‑mail info@metav-werkzeuge.com

Technical data

• Article number: M312.156.S
• GTIN: 4054469158761
• Category: Micrometers
• Type: Analogue (vernier)

Core technical data

• Measuring range: 300–325 mm
• Measuring depth: 140 mm
• Accuracy: 0.012 mm
• Reading (vernier): 0.005 mm
• Weight: 12 kg

Special features

• Carbide measuring faces
• Ratchet stop for consistent contact force
• Matt chrome‑plated scale and vernier
• Suited for blind‑hole measurement
• Delivery without setting ring

FAQ

How does the three‑point principle improve blind‑hole measurements?
The three‑point internal micrometer M312.156.S uses three equidistant contacts to centre within the bore, which converts bore geometry into a reliable diameter reading suitable for blind‑hole applications.

What accuracy and reading resolution can be expected?
The instrument offers an accuracy of 0.012 mm with a vernier reading of 0.005 mm, providing a practical compromise between resolution and workshop robustness for the Metav IndustryLine micrometer.

Are the measuring faces wear‑resistant for frequent shop use?
Yes, the tool is fitted with carbide measuring faces that significantly reduce wear and help maintain measurement integrity during regular inspection cycles.

Is a setting ring included with the micrometer?
No, delivery of the M312.156.S is supplied without a setting ring; a separate reference or calibration ring is required for traceable zeroing.

Can this micrometer measure deep bores?
With a measuring depth of 140 mm and a range of 300–325 mm, the device is intended for relatively deep bores and large internal diameters encountered in heavy‑duty components.

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