100-125mm Three-Point Internal Micrometer For Blind Hole Measurement, Rack Stop, Supplied In Case - Metav IndustryLine

Combining three-point contact, a ratchet spindle and a 100–125 mm measuring range, this instrument delivers repeatable internal measurements for blind holes and similar bores; its hardened faces and matt‑chrome vernier provide long-term stability. Order via Metav Werkzeuge for prompt specification support and availability.

Three-point internal micrometer M312.146.S — Three-point internal micrometer, 100–125 mm, Metav IndustryLine

The three-point internal micrometer M312.146.S is a precision analogue instrument for reliable internal diameter measurement, especially suited to blind‑hole bores in machine construction and tooling.

• Three-point contact for blind holes
• Measurement range 100–125 mm
• Accuracy 0.006 mm for repeatable results
• Ratchet spindle for consistent measuring force
• Matt‑chrome vernier and scale finish

Accurate blind‑hole measurement with repeatable results

The three‑contact measuring head is designed to centre automatically in blind holes, producing consistent contact at three points and reducing alignment error. Combined with a ratchet spindle, the device ensures reproducible measuring force, so readings are less dependent on operator variation. The instrument’s accuracy of 0.006 mm and reading resolution of 0.005 mm support tight tolerances in quality control. These design choices translate into fewer reworks and more reliable inspection records when assessing internal diameters and bore profiles.

Practical range and secure handling for workshop use

Classified in the Standard (100–300 mm) category, this micrometer covers common workshop requirements while remaining manageable in single‑person operation. The measuring range of 100–125 mm and a measuring depth of 140 mm allow access into deeper bores without sacrificing stiffness. At approximately 2.9 kg, the device balances robustness with practical handling, making it suitable for toolrooms, production control and setup operations where repeatability and durability are required.

Robust construction and low maintenance

The vernier and scale are matt‑chromed to resist wear and to maintain legibility under industrial conditions. The presence of hardened measuring faces increases wear resistance at the contact points, extending service life in rigorous use. As an analogue instrument, it avoids electronic vulnerabilities and requires only standard mechanical upkeep; lubrication and occasional surface cleaning are typically sufficient to preserve performance. Note that the delivery is without a setting ring, so calibration or setting equipment should be prepared as required for specific workflows.

Application focus: blind holes and precision assemblies

Specifically intended for the measurement of blind‑hole bores, the instrument is useful in inspections of castings, turned parts and assembled housings where through‑measuring tools are impractical. The three‑point arrangement simplifies centring in tapered or slightly irregular bores and supports quick comparative checks during setup. This makes the micrometer a practical companion for quality engineers, maintenance technicians and workshops demanding dependable internal measurements across production batches.

For specification advice, availability or to arrange a demonstration of technical suitability contact Metav Werkzeuge — Metav IndustryLine precision is delivered from Emmerich with experienced support

Technical Data

• SKU: M312.146.S
• GTIN: 4054469158686
• ECLASS: 21170335
• ETIM: EC003590
• Tariff number: 90173000

Facts

• Measurement range: 100–125 mm
• Measuring depth: 140 mm
• Accuracy: 0.006 mm
• Reading: 0.005 mm
• Weight: 2.9 kg

Special features

• Three‑point internal measurement
• For blind‑hole bores
• Ratchet spindle for constant force
• Analogue vernier scale matt chrome
• Hardened measuring faces
• Delivery without setting ring

FAQ

What is the intended use of this instrument?
The three‑point internal micrometer M312.146.S from Metav IndustryLine is intended for precise internal diameter measurement, with a particular focus on blind‑hole bores and similar internal geometries.

How deep can measurements be taken reliably?
The tool provides a measuring depth of 140 mm, which allows access into deep bores while maintaining stability for accurate internal readings.

What accuracy and resolution can be expected?
The micrometer has an accuracy of 0.006 mm with a reading resolution of 0.005 mm, suitable for workshop and quality‑control tasks requiring tight tolerances.

Are measuring faces hardened and corrosion‑resistant?
Yes, the instrument features hardened measuring faces and a matt‑chrome vernier and scale to enhance wear resistance and legibility in industrial environments.

Is a setting ring included for calibration?
Delivery is made without a setting ring; calibration or a setting standard should be arranged separately for initial setup.

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