325-350mm Three-Point Internal Measuring Instrument For Blind Holes, Carbide Measuring Faces, Pocket Depth 140mm, Ratchet, Supplied In Case - Metav IndustryLine

Take advantage of the combination of robust three-point contact, carbide measuring faces and a ratchet stop for reproducible blind‑hole measurement across a medium range; order the instrument directly via Metav Werkzeuge or ask our consultants for application advice.

Three-point internal gauge M312.157.S — Metav IndustryLine, 325–350 mm, carbide measuring faces

The Three-point internal gauge M312.157.S is an analogue internal measuring instrument designed for precise blind‑hole inspection in medium‑range industrial applications, providing stable centring and wear‑resistant contacts for repetitive workshop use.

• Three-point contact for stable centring
• Carbide measuring faces for wear resistance
• Ratchet stop for repeatable measuring force
• 325–350 mm medium-range coverage

Precise medium-range measuring for components and assemblies

The M312.157.S offers three-point internal measurement tailored to medium‑range tasks, classified for the 300–500 mm band where reach and stiffness must be balanced. Its accuracy ±0.012 mm and analogue vernier control make it suitable for routine quality checks and assembly verification where repeatable centring and contact stability are essential. The three contact points ensure the measured diameter is centred automatically, reducing operator influence and shortening inspection time without sacrificing accuracy.

Durable contact faces and consistent measuring force

Equipped with carbide measuring faces, the instrument resists wear even in abrasive production environments, preserving measurement reliability over long service intervals. The integrated ratchet stop standardises the applied measuring force, which limits variability between operators and supports consistent quality control documentation. A matt‑chrome scale and vernier improves contrast for clear read‑offs on the analogue display, combining durability with practical workshop ergonomics.

Application benefits and practical workshop integration

Designed for blind‑hole (sackloch) measurement, the gauge features a measuring depth of 140 mm, enabling access to recessed bores and internal features in larger components. Its construction and weight (approx. 12 kg) reflect a stable instrument intended for bench use and fixture integration rather than handheld quick checks. Supplied without an adjustment ring, the tool is optimised for controlled inspection workflows; consult Metav Werkzeuge for recommended set‑up accessories and fixture strategies to integrate the gauge into existing inspection routines.

For reliable medium‑range internal measurements choose the Metav IndustryLine M312.157.S and contact Metav Werkzeuge GmbH in Emmerich for a tailored consultation and procurement assistance via info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: M312.157.S
• GTIN: 4054469158778
• Category: Micrometers
• eClass: 21170335
• ETIM: EC003590

Facts

• Measuring range: 325–350 mm
• Measuring depth: 140 mm
• Accuracy: 0.012 mm
• Weight: 12 kg
• Tariff number: 90173000

Special features

• Carbide measuring faces (HM)
• Scale and vernier matt chrome
• Analogue vernier readout
• Ratchet stop for consistent force
• Designed for blind‑hole measurement
• Delivery without setting ring

FAQ

How repeatable are measurements with this three‑point internal gauge?
The M312.157.S achieves repeatable results through its three‑point contact design and ratchet stop; combined they reduce operator variance and support consistent readings within the specified ±0.012 mm accuracy.

Can the gauge be used for through‑bores as well as blind holes?
Yes, the internal measuring principle and three contact points are suitable for both blind and through bores, though this model is optimised for blind‑hole inspection as indicated by its design and measuring depth.

What advantage do the carbide measuring faces provide?
Carbide (HM) measuring faces on the M312.157.S increase wear resistance and maintain measurement integrity over extended use, which benefits serial inspection and abrasive environments.

Is the instrument supplied calibrated or with certificates?
The product data does not state an ISO 17025 calibration certificate; standard workshop calibration applies. For formal calibration services or certificates, Metav Werkzeuge can provide options and documentation.

Are accessories included for adjustment or setting?
Delivery is without a setting ring; recommended clamping or adjustment accessories should be selected according to the intended inspection workflow and can be discussed with Metav Werkzeuge.

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