30-40mm Three-Point Internal Measuring Gauge With Carbide Measuring Faces, Setting Ring, Box - Metav IndustryLine

Benefit from the combination of carbide measuring faces, a verified 0.005 mm accuracy and an included adjustment ring for consistent internal measurements; order the instrument directly via Metav Werkzeuge or consult our technical advisors for application-specific guidance.

Three-Point Internal Micrometer M312.137 – 30–40 mm, carbide measuring faces (Metav IndustryLine)

The Three-Point Internal Micrometer M312.137 is a precision measuring instrument intended for accurate internal diameter checks in blind and through bores within fine mechanical and workshop environments.

• Carbide measuring faces for long service life
• High precision: 0.005 mm accuracy
• Includes adjustment ring at 40 mm
• Suitable for blind-hole measurements

Precision and repeatability for quality control

The three-point measuring principle provides a stable contact geometry that reduces skew and improves repeatability in internal diameter measurement. With carbide measuring faces and an effective mechanical design, the instrument offers a declared accuracy of 0.005 mm, which supports reliable pass/fail decisions during incoming inspection and in-process checks. The solid contact and calibrated reference make the tool a practical choice where reproducible tolerances are required rather than occasional spot checks.

Compact range tailored to fine mechanical work

Classified in the micro class (measuring range 30–40 mm), this micrometer is optimised for small to medium bore diameters commonly found in precision components and assemblies. The included adjustment ring at 40 mm facilitates quick verification and calibration of the measuring span, while the three-point head adapts well to blind-hole measurement tasks. The instrument’s compact envelope allows ergonomic handling and stable positioning in confined fixtures, making it suited to watchmaking, valve seats, small housings and similar applications.

Built for durability and standards compliance

The scale and vernier are matt chrome finished for reduced reflection and abrasion resistance, while the carbide faces ensure longevity under frequent use. Manufactured to the requirements of DIN 863, the tool supports workshops seeking instruments that conform to established mechanical measuring norms. Delivery in a protective case ensures secure transport and storage; the robust surfaces and construction reduce the need for frequent replacement parts, lowering total cost of ownership in routine production environments.

Clear reading and practical use in workshops

As an analogue vernier instrument, the micrometer offers a direct mechanical reading with a fine resolution suitable for operators familiar with non-digital measurement routines. The vernier and scale arrangement gives clear incremental steps down to the declared accuracy, and the three-contact system centres inside bores to present a stable measurement reference. For process integration, the straightforward operation and minimal ancillary equipment make the micrometer an efficient tool for bench measurement, fixture setting and spot checks where fast, dependable diameter readings are required.

Contact Metav Werkzeuge in Emmerich for expert advice or to request the Metav IndustryLine three-point internal micrometer M312.137; technical consultants are available to discuss suitability and delivery options.

Technical Data

• Article number: M312.137
• GTIN: 4054469119502
• ECLASS: 21170335
• ETIM: EC003590
• Tariff number: 90173000

Core technical data

• Measuring range: 30–40 mm
• Resolution / Reading: 0.005 mm
• Accuracy: 0.005 mm
• Scope setting ring: 40 mm
• Length: 97 mm
• Standard: DIN 863

Special features

• Carbide measuring faces
• Matt chrome scale and vernier
• Analogue vernier instrument
• Suitable for blind-hole measurements
• Delivered in protective case

FAQ

How precise is the three-point measuring principle for internal diameters?
The three-point head delivers stable contact and centring for internal diameters; the M312.137 provides a declared accuracy of 0.005 mm, supporting consistent quality checks.

Is the instrument suitable for blind-hole measurements?
Yes, the design is explicitly suitable for blind-hole measurement and the specification records compatibility with blind bores.

Does the micrometer include a calibration or setting aid?
An adjustment ring at 40 mm is included for scope verification; refer to the instrument documentation for recommended calibration intervals.

Which standard does the micrometer comply with?
The instrument is produced to the requirements of DIN 863, ensuring conformity with established mechanical measuring norms.

What material finishes contribute to durability?
The scale and vernier are matt chrome finished and the measuring faces are carbide, both chosen to enhance wear resistance and long-term stability.

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