40–50mm Three-Point Internal Micrometer With Carbide Measuring Faces, Adjustable Ring, 0.005mm Accuracy, Plastic Case - Metav IndustryLine

Take advantage of the carbide measuring faces, the three-point internal measuring mechanism and the fine 0.005 mm accuracy to perform repeatable checks in blind bores; order the instrument directly via Metav Werkzeuge or contact our consultants for application advice.

Three-point internal micrometer M312.138 — analogue gauge with carbide faces and setting ring, 40–50 mm

The Three-point internal micrometer M312.138 is an analogue measuring instrument designed for precise internal measurements in the 40–50 mm range, especially suited to blind-hole checks and workshop quality control.

• Three-point internal measuring system
• Carbide measuring faces for durability
• Setting ring for reference calibration
• Accuracy 0.005 mm for precise checks

Precise internal measurement where it matters

The three-point clamping mechanism provides a centred contact and stable measurement in blind bores, translating into repeatable results even on short depths. With a measuring range of 40–50 mm and an indicated accuracy of 0.005 mm, this analogue gauge is intended for workshop inspection and production sampling where quick, reliable verification of bore diameters is required. The instrument’s non-electronic design removes dependency on batteries, while the fine graduation supports visual resolution down to the specified reading step.

Robust contact faces and reference calibration for production use

Carbide (hard‑metal) contact faces ensure wear resistance during repeated use and preserve measurement integrity in abrasive environments. The included setting ring (Ø 40 mm) allows a simple reference check before use, shortening setup time and supporting traceable inspection routines. Constructed to meet DIN 863, the device combines traditional mechanical reliability with features that reduce rework and support consistent throughput on the shop floor.

Operation, handling and shop-floor integration

As an analogue instrument with a matt‑chromed scale and vernier, the gauge is straightforward to read and maintain. Its compact form factor favours quick handling for sample checks, while the three-point geometry reduces sensitivity to slight angular misalignment during insertion. For applications requiring documentation, measurement results can be recorded manually; for process advice or to discuss traceability options, Metav Werkzeuge’s technical team can assist with best-practice workflows tailored to the production environment.

Contact Metav Werkzeuge today for technical guidance on the Metav IndustryLine three-point internal micrometer M312.138 and arrange delivery or further specification details via info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: M312.138
• GTIN: 4054469119519
• Category: Micrometers / Measuring instruments

Facts

• Measuring range: 40–50 mm
• Reading / resolution: 0.005 mm
• Accuracy: 0.005 mm
• Length: 97 mm
• Standard: DIN 863
• Tariff number: 90173000

Special features

• Carbide measuring faces (hard metal)
• Setting ring (Ø 40 mm) included
• Analogue (mechanical) instrument
• Suitable for blind-hole bores
• Scale and vernier matt chrome
• Delivered in transport case

FAQ

How is the instrument adjusted before measurement?
The gauge is adjusted using the supplied setting ring (Ø 40 mm) to check and set the reference position before taking measurements, ensuring the three-point internal micrometer M312.138 reads consistently.

Can the micrometer be used for blind bores only?
No, the device is suitable for a range of internal measurements, but its three-point geometry and included setting ring make it especially effective for blind‑hole verification.

What level of precision can be expected in routine checks?
With a specified accuracy of 0.005 mm and a reading step of 0.005 mm, the instrument is designed for precise workshop checks and sampling where sub‑0.01 mm repeatability is required.

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