8–10mm Three-Point Internal Measuring Instrument With Setting Ring, DIN 863, Supplied In Case - Metav IndustryLine

Take advantage of the combination of compact micro‑range measuring, stable three‑point contact and DIN‑compliant vernier control to secure reproducible internal measurements; order the instrument directly via Metav Werkzeuge or request specialist advice from our consultants.

Three‑point internal micrometer M312.131 — 8–10 mm range, three‑point contact (Metav IndustryLine)

The three‑point internal micrometer M312.131 is a micro‑range measuring instrument designed for accurate internal diameter checks and blind‑hole measurements in precision workshops and small‑part metrology.

• Three-point contact for stable internal measurement
• Measuring range 8–10 mm for micro applications
• DIN 863 vernier scale, matt chrome finish

Micro‑range precision where tight tolerances matter

The instrument belongs to the micro‑range class (max. 10 mm), making it suited to fine mechanical work where compact geometry and low deflection are crucial. Its three‑point contact system centres reliably in the bore, reducing eccentricity and permitting repeatable results even on short depths. With a stated accuracy of ±0.004 mm, the device provides a clear rational advantage for small‑part inspection: fewer rejects, faster set‑up and confidence when verifying bores for precision assemblies. The M312.131 is therefore appropriate for watchmaking, micromechanics and sample inspection in quality control.

Reliable measurement of blind holes and short bores

Built specifically to address internal measurements in restricted geometries, the instrument is fitted for blind holes, enabling consistent readings where standard callipers or telescoping gauges struggle. An adjustable ring facilitates fine setting of the contact span for small increments within the 8–10 mm range, so each check can be adapted without disassembly. The three‑point principle spreads contact forces evenly, which reduces deformation of soft components and enhances reproducibility in serial checks.

Clear vernier reading and durable scale finish

The scale and vernier are matt chrome plated, providing a non‑reflective surface for easy reading under workshop lighting and improved resistance to wear. The vernier offers a fine reading of 0.001 mm, enabling operators to resolve small differences at the micro scale; this enhances process control when aligning parts or setting fixtures. The mechanical construction prioritises a positive tactile feel at the spindle, supporting controlled measuring pressure and consistent operator technique for routine inspections.

Workshop suitability and standards conformity

Manufactured to DIN 863, the instrument meets recognised metrological conventions for analogue vernier measuring tools and is immediately usable on the shop floor. Its compact body (length 55 mm) and straightforward operation make it a practical addition to bench measurement kits. Supplied in a transport case, the unit is protected for transit and temporary storage — a pragmatic solution when instruments are moved between workstations or taken to inspection points. Metav’s approach to democratising precision ensures that this tool combines established design with workshop‑oriented practicality.

Secure micro‑range accuracy with Metav IndustryLine’s M312.131 — contact Metav Werkzeuge for tailored technical advice or to arrange supply via info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: M312.131
• GTIN: 4054469119441
• Tariff code: 90173000
• eClass: 21170335
• ETIM: EC003590

Numbers / Core technical data

• Measuring range: 8–10 mm
• Measuring range max: 10 mm
• Measuring range min: 8 mm
• Accuracy: ±0.004 mm
• Reading / resolution: 0.001 mm
• Length: 55 mm
• Standard: DIN 863

Special features / Versions

• Three‑point internal measurement
• Adjustable ring for fine setting (einstellring 8)
• Scale and vernier matt chrome plated
• Analogue vernier instrument
• Suitable for blind‑hole measurement
• Supplied in a transport case

FAQ

How small a bore can this instrument measure accurately?
The M312.131 is specified for an 8–10 mm measuring range and is optimised for precise work within that micro‑range.

Is the device suitable for blind‑hole measurements?
Yes — the instrument is designed for blind holes, with a three‑point contact system and an adjustable ring that permit stable readings in short or partially closed bores.

What reading resolution and accuracy can be expected?
The vernier provides a 0.001 mm reading capability and an overall accuracy of ±0.004 mm, offering high resolution for small‑part inspection.

Does the instrument conform to any metrological standard?
The micrometer is produced in accordance with DIN 863, ensuring compatibility with established analogue vernier measuring practices.

How is the instrument delivered for transport and storage?
The instrument is supplied in a transport case to protect it during transit and temporary storage between workstations.

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