20-50mm Three-Point Internal Micrometer With Setting Ring And Extension In Plastic Case - Metav IndustryLine

Compact, accurate and workshop‑ready: the set combines 0.005 mm accuracy, blind‑hole capability and practical accessories for reliable bore measurement. Benefit from fast centring, clear vernier reading and secure transport packing — order the instrument directly via Metav Werkzeuge or consult our specialists for application advice.

Three-point internal micrometer set M312.686 — 20–50 mm range, 0.005 mm accuracy (Metav IndustryLine)

The three‑point internal micrometer set M312.686 is an analogue instrument designed for precise measurement of blind bores and small internal diameters in fine mechanical and workshop environments.

• 20–50 mm measuring range
• Accuracy 0.005 mm
• Suitable for blind-hole measurement
• Includes setting ring and extension
• Delivered in protective case

Reliable centring and consistent bore measurement

The three‑point design ensures automatic centring in the bore, reducing eccentricity and providing reproducible readings even in short or blind holes. With a measuring range of 20–50 mm this tool sits in the micro class for fine mechanical work, offering 0.005 mm accuracy that meets tight inspection tolerances. The analogue vernier scale and matt‑chrome finish on the scale and vernier minimise reflection and simplify visual reading, while robust measuring faces guarantee stable contact and long service life.

Workshop‑ready set with practical accessories

Supplied as a set of four pieces, the instrument includes a setting ring and an extension 150 x Ø16.7 for deeper bores, enabling flexible use across typical workshop tasks. The components are housed in a protective case for safe transport and storage, and the matt‑chrome‑plated scale and vernier resist wear in daily use. The combined mass supports steady handling during measurement; the set’s balanced design helps reduce operator‑induced deviation and accelerates routine inspection cycles.

Tactile handling and dependable inspection results

Designed for machinists, toolmakers and quality inspectors, the analogue three‑point system offers tactile feedback that aids controlled measuring force and repeatability. The presence of defined measuring faces and an intuitive adjustment ring speeds setup and minimises downtime between checks. For production and maintenance applications where blind‑hole verification and consistency matter, this internal micrometer set supplies a practical, high‑precision solution that supports efficient decision‑making on the shop floor.

For accurate blind‑hole inspection with Metav IndustryLine quality, request the three‑point internal micrometer set M312.686 through Metav Werkzeuge or speak to our consultants at info@metav-werkzeuge.com / +49 2822 7131930 for specification guidance and delivery options

Technical data

• Article number: M312.686
• GTIN: 4054469120379
• Brand: Metav IndustryLine
• SKU: M312.686

Measurements / core technical data

• Measuring range: 20–50 mm
• Accuracy: 0.005 mm
• Pieces per set: 4
• Extension: 150 x Ø16.7
• Weight: 4.6 kg
• Adjustment rings: 25 + 40

Materials / special features

• Scale and vernier matt‑chrome plated
• Analogue vernier instrument
• Suitable for blind‑hole measurements
• Includes setting ring and extension
• Delivered in protective case
• Measuring faces included

FAQ

What measuring range does the set cover?
The three‑point internal micrometer set covers a 20–50 mm measuring range suitable for fine internal diameters.

Is the tool suitable for blind‑hole measurements?
Yes. The three‑point geometry of the M312.686 is designed specifically for blind‑hole measurement and provides reliable centring in such applications.

What accuracy can be expected during inspection?
The analogue instrument achieves an accuracy of 0.005 mm, which is appropriate for precision workshop and toolroom checks.

Which accessories are supplied with the set?
The delivery includes a setting ring and an extension (150 x Ø16.7) to extend reach into deeper bores; all parts are stored in a protective case.

Who benefits most from this instrument?
Machinists, toolmakers and quality control technicians benefit from the tactile handling, automatic centring and repeatable results offered by this internal micrometer set (M312.686).

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