225-250mm Three-Point Internal Gauge For Blind Holes With Carbide Measuring Faces, Ratchet, Supplied In Case - Metav IndustryLine

A durable, carbide‑tipped three‑point internal micrometer that delivers 0.008 mm accuracy and a 225–250 mm measuring range, making blind‑hole measurement efficient and repeatable; ideal for workshop inspection tasks. Order directly via Metav Werkzeuge or contact the Metav consultants for application advice.

Three‑point internal micrometer M312.151.S — 225–250 mm, carbide measuring faces (Metav IndustryLine)

The Three‑point internal micrometer M312.151.S is a precision instrument designed for accurate blind‑hole measurement across the 225–250 mm range, suited to workshop metrology and production inspection.

• Carbide measuring faces for wear resistance
• Ratchet thimble for consistent measuring force
• 140 mm measuring depth for deep bores
• Supplied in a transport case

Precision where blind holes must be verifiable

The instrument is designed to provide reliable measurements in blind‑hole applications, combining a 225–250 mm range with high‑hardness carbide measuring faces to resist wear in daily use. The engraved scale and vernier are matt‑chrome plated, reducing glare and improving read‑out reliability on the analogue nonius. With a stated accuracy of ±0.008 mm, the tool supports quality control tasks that require reproducible internal diameters, and the ratchet thimble helps to eliminate variation from operator applied force. This balance of mechanical robustness and fine resolution makes the instrument suited to routine inspection in toolrooms and machine shops.

Robust design for repeatable measurement results

Constructed for stability and repeatability, the three‑point measuring head ensures concentric contact in bores while the robust body and weight contribute to measured consistency. The 140 mm measuring depth allows access to deeper blind holes without compromising stiffness, so measurements remain reproducible across the full working range. The analogue nonius reading complements the mechanical design with a fine scale, enabling tradespeople to verify tolerances with confidence. These features reduce rework and inspection uncertainty, supporting smoother production flows and clearer quality records.

Practical delivery and workshop integration

Delivery includes a protective transport case suitable for workshop handling; the instrument arrives without a setting ring, which keeps the kit compact for in‑bench use. The micrometer’s form factor and hardened carbide faces mean lower maintenance and longer intervals between service actions, while the supplied ratchet ensures consistent contact pressure during routine checks. Classified within the standard workshop range (100–300 mm), the tool sits at the sweet spot between reach and stiffness, making it a practical choice for everyday metrology tasks such as part inspection, jig setup and acceptance testing.

For tailored advice on implementing the Metav IndustryLine three‑point internal micrometer in production or inspection workflows, contact Metav Werkzeuge for specification guidance and availability.

Technical data

• Article number: M312.151.S
• GTIN: 4054469158730
• Label: Three‑point internal micrometer, 225 - 250 mm, blind hole, carbide measuring faces; without setting ring

Facts

• Measuring range: 225–250 mm
• Accuracy: ±0.008 mm
• Reading: 0.005 mm
• Measuring depth: 140 mm
• Weight: 4.5 kg

Special features

• Carbide measuring faces
• Matt‑chrome scale and vernier
• Ratchet thimble for constant measuring force
• Analogue nonius
• Delivered without setting ring
• Supplied in a transport case
• Intended for blind‑hole measurement
• Category: Micrometer screw gauges (three‑point internal)

FAQ

Is this instrument suitable for deep blind‑hole measurement?
Yes. The M312.151.S features a 140 mm measuring depth, which allows reliable access and repeatable measurement in relatively deep blind holes within its 225–250 mm range.

What level of accuracy can be expected in routine use?
The micrometer is specified with an accuracy of ±0.008 mm; combined with the ratchet thimble and carbide faces, this yields consistent, wear‑resistant results for standard workshop inspection.

Does the delivery include a calibration certificate?
The delivery does not state an ISO 17025 calibration; it is supplied without a setting ring and in a transport case. For specific calibration requirements, Metav Werkzeuge can advise on available services.

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