250mm Three-Point Internal Micrometer With Cemented Carbide Faces, Ratchet, Case - Metav IndustryLine

Take advantage of high reproducibility, carbide wear resistance and a comfortable ratchet stop for consistent internal diameter checks; the combination supports efficient quality control in workshop and inspection environments. Order the Three-point internal micrometer M312.151 directly from Metav Werkzeuge or consult our technical advisors for application guidance.

Three-point internal micrometer M312.151 — 225–250 mm, carbide measuring faces

The Three-point internal micrometer M312.151 is an analogue internal micrometer designed for precise measurement of large bores in workshop and inspection settings, offering a robust three-point contact system and carbide measuring faces for long service life

• Three-point contact for stable internal measurement
• Carbide measuring faces for wear resistance
• Measuring range 225–250 mm

Consistent readings for repeatable quality control

The analogue micrometer provides a resolution of 0.005 mm and an accuracy of ±0.008 mm, delivering quantifiable performance suitable for routine inspection and process control. The integrated ratchet stop ensures a repeatable measuring force, which reduces operator-related variation and increases measurement reproducibility — a decisive advantage when multiple parts must meet the same tolerance band. These characteristics position the instrument as a rational choice where clear, comparable data and process stability are priorities.

Durable construction and long-term usability

Equipped with carbide measuring faces, the instrument resists wear when used on standard workshop materials, preserving measuring geometry over time and reducing rework. The scale and vernier are matt chrome-plated, improving legibility while limiting glare under workshop lighting. The device is supplied without a setting ring, allowing integration into existing calibration routines or the use of a site-specific master ring for traceable setup. For transport protection, the micrometer is delivered in a suitable transport case, which guards the instrument during storage and shipment.

Practical design for large-bore internal measurement

The three-point contact geometry centres automatically and gives stable support against bore walls, simplifying centring in cylindrical cavities and reducing the need for complex fixtures. With a measuring range of 225–250 mm and a measuring depth of 140 mm, the tool covers large internal diameters while remaining manageable for one or two operators in a workshop environment. The mechanical vernier concept is familiar to technicians and requires no batteries, promoting availability on the shop floor and straightforward maintenance.

For tailored application advice or to purchase the M312.151 from Metav Werkzeuge, contact our Emmerich specialists by phone +49 2822 7131930 or by email at info@metav-werkzeuge.com for precise delivery and technical support.

Technical data

• Article number: M312.151
• GTIN: 4054469119571
• Label: Three-point internal micrometer, 225–250 mm, carbide measuring faces; without setting ring

Core specifications

• Measuring range: 225–250 mm
• Measuring depth: 140 mm
• Resolution (reading): 0.005 mm
• Accuracy: ±0.008 mm
• Tariff code: 90173000

Features and materials

• Analogue micrometer with vernier scale
• Carbide measuring faces
• Scale and vernier matt chrome-plated
• Ratchet stop for constant measuring force
• Delivery without setting ring
• Delivered in transport case for protection

FAQ

Is this micrometer suitable for measuring large internal bores?
Yes. The three-point internal micrometer M312.151 is designed specifically for internal diameters in the 225–250 mm range and provides stable contact and centring for large bores.

Does the delivery include a setting ring for calibration?
No. The instrument is supplied without a setting ring; a site-specific master ring or calibration procedure should be used to set the zero position before use.

What are the resolution and stated accuracy of this micrometer?
The M312.151 offers a resolution of 0.005 mm and an accuracy of ±0.008 mm, values that support routine workshop inspection and comparative quality checks.

What material are the measuring faces made from?
The measuring faces are made of carbide, chosen for its wear resistance and long-term stability when measuring in standard industrial applications.

Is the micrometer supplied in protective packaging?
Yes. The instrument is delivered in a transport case to protect the tool during shipment and storage.

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