6-12mm Three-Point Internal Micrometer Set With Extension And Setting Ring, Chrome Finish - Metav IndustryLine

Take advantage of the precision of a three‑point measuring head, the compact 6–12 mm measuring range and the high repeatability for blind‑hole inspections; order the instrument directly via Metav Werkzeuge or consult our specialists for tailored advice.

Three‑point internal micrometer M312.684 — 6–12 mm range, 0.004 mm accuracy, Metav IndustryLine

The Three‑point internal micrometer M312.684 is a compact measuring set designed for accurate internal diameter checks in confined or blind bores, combining a three‑point contact system with workshop‑grade construction for repeatable results.

• Three-point measuring head for blind bores
• Measuring range 6–12 mm
• Accuracy 0.004 mm for fine measurements
• Includes setting ring and extension
• Delivered as a 3-piece inspection set

Accurate bore measurement in restricted spaces

The three‑point contact mechanism provides a centring action that converts slight axial movement into an accurate radial reading, ensuring consistent contact with the bore even in blind holes. With a measuring range of 6–12 mm the instrument falls into the micro category for compact measuring tasks, making it especially suitable where space is limited or components are small. The combination of a fine vernier and a reading increment of 0.001 mm together with a stated accuracy of 0.004 mm supports high repeatability in manufacturing and inspection routines, reducing rework and improving first‑pass yield.

Robust workshop construction and ready‑to‑use accessories

Built for daily use, the scale and vernier are matt chrome plated for clear legibility and durable surface protection, while the design includes measuring faces to deliver stable contact with the workpiece. The set is supplied with a setting ring (8+10) and an extension (50×Ø5.7), giving immediate flexibility for deeper or recessed bores without the need for improvised adapters. Supplied as a 3‑piece set, the components cover a small range of internal diameters while keeping handling simple and ergonomic — a practical solution for machine shops, toolrooms and maintenance departments.

Efficiency gains in metrology workflows

By replacing trial‑and‑error gauging with a compact, dedicated internal measuring set, inspection cycles are shortened and measurement variance is reduced. The instrument’s three‑point head inherently centres in the bore, which lowers operator‑dependent error and increases throughput in serial checks. As a workshop instrument from Metav IndustryLine, it integrates smoothly into quality control stations and complements bench measuring tools, enabling consistent documentation of internal dimensions and better process control across production batches.

Contact Metav Werkzeuge today to request the M312.684 set and receive specialist advice from our technical consultants based in Emmerich.

Technical data

• SKU: M312.684
• GTIN: 4054469120355
• Product: Three‑point internal micrometer

Facts

• Measuring range: 6–12 mm
• Resolution (reading): 0.001 mm
• Stated accuracy: 0.004 mm
• Pieces per set: 3
• Weight (set): 1 kg

Special features

• Three‑point measuring head for internal diameters
• Suitable for blind‑hole measurements
• Scale and vernier: matt chrome plated
• Includes setting ring (8+10) and extension (50×Ø5.7)
• Analogue vernier display
• HS code: 90173000

FAQ

How does the three‑point head measure blind holes?
The three‑point mechanism expands to contact the bore at three equidistant points, centring automatically and converting the radial position into an axial reading; the M312.684 set from Metav IndustryLine is optimised for this task.

What accuracy and resolution can be expected?
The instrument offers a reading increment of 0.001 mm and a stated accuracy of 0.004 mm, suitable for fine workshop inspections and repeatable bore checks.

What accessories are supplied with the set?
The set is delivered complete with a setting ring (8+10) and an extension (50×Ø5.7), giving immediate capability for standard and recessed blind‑hole measurements.

For which applications is this set best suited?
With its 6–12 mm range, the tool is classified in the micro category and is ideal for precision work on small bores, fine mechanical parts and confined spaces in toolrooms and maintenance.

Is the set ready to use on arrival?
Yes, the three‑piece set includes the necessary setting ring and extension so that measurements can begin without additional adapters.

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