300-325mm Three-Point Inside Micrometer Ratchet, Matt Chrome Scale And Vernier, 0.012mm Accuracy, Plastic Case - Metav IndustryLine

Take advantage of precise internal measurement and robust workshop handling: the combination of a 300–325 mm measuring range, an accuracy of ±0.012 mm and a ratchet stop ensures reproducible results for medium‑sized bores and fixtures. Order the instrument directly via Metav Werkzeuge or consult our specialists for application advice.

Three‑point inside micrometer M312.156 — three‑point inside micrometer, 300–325 mm range, ratchet stop (Metav IndustryLine)

The three‑point inside micrometer M312.156 is a precision instrument for internal diameter measurement in jig, mould and general industrial metrology, providing stable contact in medium‑sized bores.

• Medium range 300–325 mm for larger components
• Analogue vernier resolution 0.005 mm
• Ratchet stop for constant measuring force
• Matte chrome‑plated scale and vernier

Precise, repeatable internal measurement for production control

The three‑point contact spindle design gives a stable, concentric seating inside bores, reducing eccentricity and improving repeatability. With an indicated accuracy of ±0.012 mm and a vernier resolution of 0.005 mm, this analogue instrument is intended for routine quality control where reliable numeric comparability is required. The ratchet stop maintains a consistent measuring force so measurements are less dependent on operator technique, which supports tighter process control and reduces scrap rates.

Robust engineering that suits busy workshops

Built for repetitive use, the instrument features a matte chrome‑plated scale and vernier for clear reading and good wear resistance. The measuring depth of 140 mm and sturdy body construction make it suitable for measuring recesses and larger internal features without compromising stiffness. Hardened measuring faces are included to withstand contact wear, and the delivery in a protective case supports safe transport between job sites and polishing benches.

Optimised for medium‑range internal diameters

With a measuring span of 300–325 mm, this device falls into the medium class of internal measuring tools: long enough to reach larger fixtures and housings, yet compact enough to be manageable by a single operator in most setups. That positioning makes it particularly useful in toolrooms, mould shops and medium‑series production where balance between reach and rigidity is essential for reproducible results.

Practical workflow features to speed up inspections

The analogue vernier operation avoids dependence on batteries and simplifies long‑term serviceability; the ratchet provides tactile control for consistent readings and the instrument’s weight and build quality aid in stable handling. Note that the instrument is supplied without a setting ring, so calibration or setting with a suitable reference standard is required before first use. The absence of electronic data output reflects a focus on rugged, low‑maintenance measurement routines.

Choose the Metav IndustryLine three‑point inside micrometer M312.156 for dependable medium‑range internal measurement — contact Metav Werkzeuge in Emmerich for tailored advice or to place an order (info@metav-werkzeuge.com | +49 2822 7131930)

Technical data

• SKU: M312.156
• GTIN: 4054469119632
• Category: Micrometers (Messschrauben)
• eClass: 21170335
• ETIM: EC003590

Facts

• Measuring range: 300–325 mm
• Measuring depth: 140 mm
• Resolution (vernier): 0.005 mm
• Accuracy: ±0.012 mm
• Weight: 12 kg
• Tariff code: 90173000

Special features

• Matte chrome‑plated scale and vernier
• Analogue instrument with vernier reading
• Ratchet stop for constant measuring force
• Hardened measuring faces
• Delivered in protective case
• Supplied without setting ring
• Category: three‑point inside micrometer

FAQ

What measuring range does this micrometer cover?
The three‑point inside micrometer M312.156 covers a measuring range of 300–325 mm, suitable for medium‑sized internal diameters.

How fine is the reading on the instrument?
The instrument provides a vernier resolution of 0.005 mm and an indicated accuracy of ±0.012 mm for consistent inspection results.

Is a setting ring included with delivery?
No, delivery of the Metav IndustryLine M312.156 is without a setting ring; a reference standard is required to set the instrument before first use.

Does the micrometer include hardened measuring faces?
Yes, the M312.156 is supplied with hardened measuring faces to ensure long‑term wear resistance during repeated contact measurements.

Can the instrument be used without batteries or electronics?
Yes, the analogue vernier operation of the M312.156 requires no batteries, prioritising ruggedness and low maintenance.

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