25-30mm Three-Point Internal Micrometer With Setting Ring And Extension, Calibrated In Case - Metav IndustryLine

Choose a reliable combination of three‑point centring, ±0.005 mm accuracy and a matt‑chrome vernier for consistent blind‑hole inspection; the robust construction supports reproducible measurements and reduces rework. Order the instrument directly via Metav Werkzeuge or consult our specialists for application advice.

Three‑point internal micrometer M312.136.P — three‑point centring, 25–30 mm range

Three‑point internal micrometer M312.136.P is an analogue measuring instrument designed for precise inspection of blind holes and small bores in production and toolmaking environments.

• Measuring range 25–30 mm
• Accuracy ±0.005 mm
• Includes setting ring and extension

Accurate blind‑hole inspection with three‑point centring

The three‑point design centres reliably inside bores, providing a stable contact geometry that minimises eccentricity and user error. With an accuracy of 0.005 mm and an analogue vernier, the instrument is suited to quality control tasks where fine tolerances matter. The hardened measuring faces (contact surfaces) give wear resistance, so repeat measurements remain consistent even after frequent use. This combination of centring geometry and hardened contacts reduces measurement scatter and supports faster acceptance decisions on the shop floor.

Clear reading and robust scale for workshop use

A matt‑chrome scale and vernier ensure good contrast under workshop lighting while resisting glare. The instrument’s analogue readout with a 0.005 mm indication value is straightforward to interpret and reduces downtime compared with more complex setups. A compact overall length and a middle‑weight construction balance handling and stability: the micrometer’s design reduces vibration sensitivity during short‑reach checks and eases one‑person operation for routine inspections.

Accessories that extend capability and simplify setup

Delivery includes a setting ring (25) and an extension (150 × Ø16.7), enabling quick calibration of the measuring head and access to deeper blind holes without altering the instrument’s measuring principle. The included accessories allow the device to be adapted to variant bore depths while maintaining the same reference geometry. For batch checks, the extension combination reduces the need for fixture changes, improving throughput and lowering per‑part inspection time.

Where this instrument delivers value in production

Engineered for blind‑hole and internal bore verification, the micrometer is ideal for toolmaking, small series production and maintenance work where bore concentricity and diameter tolerance are critical. The three‑point contact reduces the influence of off‑axis positioning and the fine accuracy helps to catch deviations early, avoiding costly rework. Integration into a flow of regular spot checks supports reliable process control and documentation of conformity.

Consider the Metav IndustryLine three‑point internal micrometer for precise blind‑hole measurement and ask Metav Werkzeuge for tailored advice or application examples.

Technical data

• Article number: M312.136.P
• GTIN: 4054469158655
• Manufacturer: Metav IndustryLine
• SKU: M312.136.P

Key figures

• Measuring range: 25–30 mm
• Accuracy: 0.005 mm
• Reading value: 0.005 mm
• Length: 80 mm
• Weight: 1.2 kg

Features

• Three‑point measuring head
• Suitable for blind‑hole measurement
• Scale and vernier matt chrome‑plated
• Includes setting ring (25)
• Extension 150 × Ø16.7
• Hardened measuring faces
• Analogue instrument

FAQ

What is the main advantage of the three‑point design?
The three‑point geometry centres automatically in the bore and reduces eccentricity; the three‑point internal micrometer offers more stable contact and improved repeatability compared with two‑point probes.

Which blind‑hole depths can be measured with the supplied extension?
The instrument is supplied with an extension (150 × Ø16.7) that increases reach for deeper blind‑hole checks; further extension options may be discussed with Metav Werkzeuge for specialised depths.

How fine is the resolution and how does that relate to accuracy?
The analogue readout provides a reading value of 0.005 mm and the device is specified with an accuracy of 0.005 mm, giving close agreement between displayed value and true dimension for routine inspection tasks.

Are the measuring faces wear‑resistant for serial inspections?
Yes, the measuring faces are hardened to resist wear; this preserves the reference surfaces and supports reproducible results over extended use with the three‑point internal micrometer.

Which accessories are included with the M312.136.P?
Delivery of M312.136.P includes a setting ring (25) and an extension (150 × Ø16.7) for calibration and extended reach during blind‑hole measurements.

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