12–20mm Three-Point Internal Measuring Set, Two-Piece, Chrome-Plated Scale And Vernier, For Blind Holes, Wooden Case - Metav IndustryLine

Take advantage of the combination of high mechanical precision, a compact 12–20 mm measuring range, and robust carbide measuring faces for dependable internal measurements; order the instrument directly via Metav Werkzeuge or consult the Metav team for application advice.

Three-point internal micrometer set M312.175 — Analogue internal micrometer, 12–20 mm, Metav IndustryLine

Three-point internal micrometer set M312.175 is a compact analogue instrument designed for accurate measurement of internal diameters and blind bores in precision workshops and inspection stations

• High precision 0.005 mm accuracy
• Carbide measuring faces for long life
• Three-point contact for stable centring
• Two-piece set with extension rod Ø11.7 mm

Stable centring for repeatable internal readings

The three-point contact geometry ensures the measuring anvils centre reliably inside bores, reducing eccentricity during measurement. With a 12–20 mm range and an analogue vernier reading of 0.005 mm, the instrument delivers a high level of repeatability suited to fine mechanical work. The construction follows DIN 863, which standardises dimensional inspection practice and supports reproducible results in routine quality control. The matt chrome-plated scale and vernier provide low reflectivity for clear sighting and reduce the risk of misreading in mixed workshop lighting.

Durable construction that preserves accuracy over time

Wear resistance is increased by carbide measuring faces, which maintain measurement integrity when the anvils contact metal surfaces repeatedly. The matt chrome-plated scale and vernier are corrosion-resistant and easy to clean, helping to sustain accuracy without frequent service. Supplied as a two-piece set with an extension rod Ø11.7 mm, the equipment adapts to a range of internal geometries while remaining compact for bench and toolroom use. These features combine to lower lifetime cost through extended service intervals and fewer replacements.

Practical calibration and adaptation for blind bores

The instrument is designed specifically for internal diameters and is suitable for blind bores, where the three-point contact gives secure engagement without the need for through-holes. A setting ring (Ø16 mm) is provided for zeroing and verification of the mechanical scale. The analogue mechanism is simple to operate and robust under workshop conditions, offering a straightforward measurement workflow that integrates easily into inspection routines. For specialised tasks or integration into a larger metrology setup, the set’s modular nature supports quick adaptation with the included extensions.

Contact Metav Werkzeuge in Emmerich for tailored application advice on the Metav IndustryLine three-point internal micrometer set M312.175 or to discuss calibration and delivery options

Technical Data

• Article number: M312.175
• GTIN: 4054469119823
• ETIM: EC003590
• ECLASS: 21170335
• Tariff number: 90173000

Facts

• Measuring range: 12–20 mm
• Resolution / reading: 0.005 mm
• Accuracy: 0.005 mm
• Standard: DIN 863
• Pieces per set: 2

Special features

• Analogue vernier scale, matt chrome-plated
• Carbide measuring faces
• Three-point internal measuring design
• Suitable for blind bores
• Setting ring Ø16 mm included
• Extension rod 150 x Ø11.7 mm

FAQ

What measurement range does this set cover?
The Metav IndustryLine three-point internal micrometer set M312.175 covers a measuring range of 12–20 mm, suitable for small internal diameters and fine mechanical components.

How precise is the measurement with this micrometer set?
The instrument offers a vernier reading and accuracy of 0.005 mm, providing high mechanical precision for routine inspection and workshop use.

Are the measuring faces suitable for repeated use on steel?
Yes, the set features carbide measuring faces, which resist wear and maintain accuracy during repeated contact with steel and other metals.

Can this set measure blind bores?
The three-point contact design is explicitly intended for internal diameters and is suitable for blind bores, allowing stable centring without through-holes.

What is included in the delivery of the set?
The delivery comprises the two-piece internal measuring set (two measuring heads), a setting ring (Ø16 mm) and an extension rod 150 x Ø11.7 mm as listed.

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