275-300mm Three-Point Inside Micrometer for Blind Holes With Carbide Measuring Faces, Ratchet, Supplied in Case - Metav IndustryLine

Take advantage of the combination of high reproducibility, wear‑resistant carbide measuring faces and a practical ratchet stop for consistent bore checks; benefit from Metav’s workshop supply chain and order the instrument directly via Metav Werkzeuge or consult their specialists for specification support.

Metav IndustryLine Three‑point Internal Micrometer M312.153.S – 275–300 mm, carbide measuring faces

The Metav IndustryLine Three‑point Internal Micrometer M312.153.S is a mechanical precision instrument for measuring blind bores in production and inspection environments, engineered for stable contact and repeatable results.

• Three‑point measurement for internal bores
• Carbide measuring faces for long wear life
• Range 275–300 mm with 140 mm depth
• Ratchet stop for consistent measuring force

Consistent bore measurement where it matters

The three‑point contact geometry combined with a ratchet stop produces a reproducible contact condition that reduces operator variability during internal measurements. With a measuring range of 275–300 mm and a measuring depth of 140 mm, this instrument is suited to larger bores and recesses where standard gauges struggle. The device is an analog vernier tool with a fine reading increment of 0.005 mm and an accuracy specified as 0.009 mm, giving a reliable numerical basis for quality control in machining and assembly operations. Such repeatability shortens inspection loops and supports tighter process control on production lines.

Built for durability and workshop practice

Design choices focus on longevity and tactile feedback: the measuring faces are carbide, making them resistant to wear from repeated contact; the scale and vernier are matt‑chrome plated, which reduces reflections and protects against corrosion. The robust construction is reflected in the instrument mass (about 5.3 kg), providing stability when conducting measurements in the workshop. Delivery is stated without a setting ring, so calibration or verification should be planned as part of integration into existing quality routines. These attributes mean fewer service interventions and a lower total cost of ownership over time.

Application and integration in production workflows

Classified in the Standard measuring range category (up to 300 mm), this three‑point internal micrometer bridges typical shop‑floor needs in machine and toolmaking: it measures bore diameters in housings, fixtures and components used across mechanical engineering. Its analogue design requires no electronics, simplifying use at the bench or in environments where robust, low‑maintenance instruments are preferred. The unit’s specific suitability for blind‑hole measurement makes it a practical choice for quality inspectors and setup technicians who need a dependable mechanical solution for internal dimensions.

Contact Metav Werkzeuge for tailored advice or to arrange procurement of the Metav IndustryLine three‑point internal micrometer; their specialists in Emmerich will support specification checks and delivery arrangements — eMail: info@metav-werkzeuge.com | Tel: +49 2822 7131930

Technical data

• Article number: M312.153.S
• GTIN: 4054469158754
• ETIM: EC003590
• eClass: 21170335

Facts

• Measuring range: 275–300 mm
• Measuring depth: 140 mm
• Accuracy: 0.009 mm
• Reading increment: 0.005 mm
• Weight: 5.3 kg
• Tariff number: 90173000

Materials and features

• Scale and vernier matt‑chrome plated
• Carbide measuring faces
• Ratchet stop
• Designed for blind‑hole measurement
• Supplied without setting ring
• Analog vernier instrument

FAQ

How does three‑point measurement improve internal bore readings?
Three contact points self‑centre inside the bore and average out small eccentricities; the Metav IndustryLine three‑point internal micrometer M312.153.S therefore provides a stable reference and reduces reading scatter compared with single‑point probes.

Can this micrometer be used for blind‑hole measurement?
Yes. The instrument is specifically designed for blind holes and recesses, with a measuring depth of 140 mm and contact geometry optimised for such applications.

What accuracy and resolution can be expected during inspections?
The device offers a declared accuracy of 0.009 mm and a reading increment of 0.005 mm, which supports reliable dimensional control in workshop and inspection tasks.

Is a setting ring included for calibration?
No. Delivery is made without a setting ring; calibration or verification should be performed using a separate standard or reference gauge.

How should the carbide faces be maintained?
Keep the measuring faces clean and free of chips; avoid aggressive wiping that could embed particles. Regular visual checks and gentle cleaning will preserve the carbide faces and the plated scale finish.

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