250–275mm Three-Point Internal Micrometer With Carbide Measuring Faces, 140mm Depth, Ratchet, Plastic Case - Metav IndustryLine

Benefit from reproducible internal measurements, a three‑point contact system and carbide measuring faces that resist wear; the instrument is supplied in a protective case for safe transport. Order the instrument directly via Metav Werkzeuge or ask the consultants if needed.

M312.152 three‑point internal micrometer — 250–275 mm, carbide measuring faces (Metav IndustryLine)

The M312.152 three‑point internal micrometer is a precision tool for reliable bore measurement in workshop and production environments, designed for internal diameters from 250 to 275 mm and equipped for repeatable contact and long service life.

• Three-point contact for stable internal measurement
• Carbide measuring faces for wear resistance
• Ratchet for repeatable contact pressure
• Delivered in protective case; no setting ring included

Accurate three‑point geometry for repeatable results

The three‑point contact geometry ensures centring and stability in cylindrical bores, reducing eccentricity compared with two‑point probes. Combined with the fine analogue division (reading 0.005 mm) and the specified measurement precision (±0.009 mm), the instrument provides clear, reproducible results for quality control and serial inspection. The ratchet stop maintains a constant measuring force, which in practice minimises operator‑dependent scatter and simplifies comparison of consecutive measurements.

Built to withstand workshop use and long measurement cycles

Robustness is achieved through carbide measuring faces, which offer high resistance to abrasion in frequent use, and a matt‑chromed scale and vernier that reduce glare and preserve legibility. The ratchet mechanism contributes to consistent contact pressure and gentle handling of delicate bores. For safe transport and protection between shifts the micrometer is supplied in a protective case; note that the delivery does not include a setting ring, so a gauge ring should be sourced separately if traceable calibration rings are required.

Optimised for standard workshop ranges and practical reach

Classified for the standard measuring range (100–300 mm), the 250–275 mm span strikes a balance between reach and stiffness that suits general machine‑ and metal‑work tasks such as bearing seats, housings and large bushings. The measuring depth 140 mm allows access into moderately deep bores without compromising handling. This combination of range and rigidity supports efficient inspection routines where mid‑sized components are inspected regularly.

Simple handling, clear readings and maintenance guidance

As an analogue instrument with a fine vernier, the device offers straightforward readings and low susceptibility to electrical interference. The vernier and scale are designed for workshop readability, and routine maintenance is limited to keeping the carbide faces clean and avoiding shock loads. Where repeatability is essential, use the ratchet for each measurement and store the tool in its case to protect the measuring faces from nicks or contamination.

Choose the Metav IndustryLine three‑point internal micrometer M312.152 for consistent bore measurement and contact Metav Werkzeuge in Emmerich for personalised advice and reliable supply: info@metav-werkzeuge.com, +49 2822 7131930

Technical information

• Article number: M312.152
• GTIN: 4054469119588
• ECLASS: 21170335
• ETIM: EC003590
• Customs tariff: 90173000

Measurements and accuracy

• Measuring range: 250–275 mm
• Measuring depth: 140 mm
• Resolution (reading): 0.005 mm
• Specified accuracy: 0.009 mm
• Type: analogue

Design & features

• Carbide measuring faces
• Ratchet stop for constant measuring force
• Scale and vernier matt‑chromed
• Delivered in protective case
• No setting ring included
• Category: three‑point internal micrometer
• Manufacturer: Metav IndustryLine

FAQ

How precise are the readings with this micrometer?
The M312.152 three‑point internal micrometer provides a reading resolution of 0.005 mm with a specified accuracy of ±0.009 mm, making it suitable for workshop and production checks where reproducibility is required.

Is the instrument suitable for measuring deeper bores?
Yes, the instrument has a measuring depth of 140 mm and a range of 250–275 mm, which covers many medium‑depth bores in machines, housings and assemblies.

Are the measuring faces durable for frequent use?
The device is fitted with carbide measuring faces, which are designed to resist wear and maintain measurement quality during regular inspection cycles.

Does the delivery include a calibration or setting ring?
Delivery of the M312.152 does not include a setting ring; the micrometer is supplied in a protective case and a separate gauge ring should be used if a traceable reference or calibration ring is required.

What features help to reduce measurement variability?
The three‑point contact design and the integrated ratchet stop help to centre the instrument and maintain a consistent measuring force, which together reduce operator‑dependent variation.

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