325-350mm Three-Point Internal Micrometer With Carbide Measuring Faces, 140mm Depth, 12kg Case Delivery - Metav IndustryLine

Take advantage of the combination of carbide measuring faces, a ratchet stop for consistent contact and the precise 325–350 mm measuring range to secure reproducible bore measurements; order the Three-point internal micrometer M312.157 directly via Metav Werkzeuge or ask our consultants if needed.

Three-point internal micrometer M312.157 — 325–350 mm, carbide measuring faces (Metav IndustryLine)

The Three-point internal micrometer M312.157 is a precision bore gauge designed for reliable internal diameter measurement in the 325–350 mm range, intended for workshop inspection and toolroom applications.

• Three-point measuring principle for stable centring
• Carbide measuring faces for abrasion resistance
• Ratchet stop for consistent measuring pressure
• 325–350 mm range for medium-sized bores

Stable centring and repeatable results for medium bores

The three-point measuring principle provides a centred contact with the bore, reducing runout and improving repeatability compared with single-contact probes. With carbide measuring faces only the contact surfaces wear, which extends service life under repeated use. The instrument is classified for the medium measuring range (300–500 mm), offering the best compromise between reach and handling for larger components such as housings, fixtures and medium-sized bores. Stated measuring accuracy is 0.012 mm while the analogue reading resolution is 0.005 mm, enabling dependable control measurements on the shop floor.

Robust construction with operator-friendly handling

A matt-chromed scale and vernier provide a corrosion-resistant reference that is easy to read under workshop lighting. The integrated ratchet stop ensures a consistent measuring force, which reduces operator-induced variation and supports meaningful comparison of repeated measurements. As an analogue instrument, the gauge requires no batteries and offers straightforward operation for experienced technicians and quality inspectors who favour tactile feedback and tried-and-tested mechanical systems. The solid build and carbide tips make it suitable for regular use in industrial environments.

Practical scope of use and what's included

Designed for internal diameter checks across a 325–350 mm span with a measuring depth of 140 mm, the instrument covers common inspection tasks in machining, assembly and maintenance. The delivery excludes an adjustment (setting) ring, so calibration or comparison against a ring gauge should be arranged if traceable reference checks are required. The three-point concept and robust contact faces make this gauge particularly suitable for repetitive checks where centring and wear resistance are priorities.

Contact Metav Werkzeuge to discuss technical details or to arrange purchase of the M312.157 three-point internal micrometer and ensure it fits the required inspection routine

Technical data

• SKU: M312.157
• GTIN: 4054469119649
• Harmonized tariff number: 90173000

Core technical data

• Measuring range: 325–350 mm
• Measuring depth: 140 mm
• Reading resolution: 0.005 mm
• Accuracy: 0.012 mm

Special features

• Three-point internal measuring principle
• Carbide measuring faces
• Matt-chromed scale and vernier
• Ratchet stop
• Delivery without setting ring
• Analogue instrument

FAQ

What measurement range does this gauge cover?
The three-point internal micrometer M312.157 covers internal diameters from 325 to 350 mm, making it suitable for medium-sized bores.

What accuracy and resolution can be expected?
The instrument is specified with an accuracy of 0.012 mm and an analogue reading resolution of 0.005 mm for repeatable workshop checks.

Are the contact faces durable for industrial use?
Yes, the M312.157 is fitted with carbide measuring faces that provide high abrasion resistance and longevity under repeated contact.

Is any calibration or setting accessory included?
Delivery is made without a setting ring; a calibration or setting ring should be used separately for traceable reference checks when required.

How does the ratchet stop help in measurement?
The ratchet stop provides a consistent measuring force, minimising variation between measurements and improving reproducibility of results.

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