6-8mm Three-Point Internal Gauge With Setting Ring, Supplied In Case - Metav IndustryLine

Take advantage of a compact, workshop-ready gauge that combines secure three-point contact, micro-range precision and practical accessories for blind-bore inspection; the included setting ring and extension rods simplify calibration and repeatable measurement. Order the instrument directly via Metav Werkzeuge or consult the team for specification advice.

Three-point internal micrometer M312.130 — 6–8 mm with setting ring (Metav IndustryLine)

A three-point internal micrometer M312.130 designed for precise measurement of small bores, especially blind holes, in fine mechanical and quality‑control applications.

• Three-point contact for secure centring
• Micro-range 6–8 mm for fine mechanical work
• Matt chrome scale and vernier finish
• Supplied with setting ring and extension

Precision where very small diameters matter

The instrument is tailored to the micro range and covers a measurement span of 6–8 mm, which places it firmly in the category for extremely compact workpieces such as watch components, miniature bearings and small bore features. The three‑point contact geometry produces a stable datum in the bore and reduces miscentring, while the specified accuracy ±0.004 mm gives a verifiable tolerance for inspection tasks. This combination of geometry and repeatability means fewer rejected parts and faster go/no‑go decisions on the shop floor.

Built for reproducible calibration and handling

Calibration is straightforward thanks to the supplied setting ring Ø8 mm, allowing a quick reference check before a measuring session. The instrument features a matt chrome scale and vernier, providing a non‑reflective, durable reading surface with an indicated reading step of 0.001 mm, so analogue vernier interpretation remains precise for experienced users. Delivered in a protective transport case, the gauge and its accessories are protected during storage and transit, supporting reliable reproducibility from job to job.

Improves throughput in routine bore inspection

As an analogue, vernier‑type gauge the device is robust and immediately usable without electronic dependencies, so repetitive bore checks can be performed quickly and with minimal setup. The included extension rods permit measurement of deeper blind holes and make the tool more flexible across workpieces. The three‑leg measuring head secures contact against the bore wall, reducing operator‑induced variation and helping to shorten inspection cycles — a clear rational advantage when throughput and traceable repeatability matter.

Practical applications and workshop guidance

This gauge is suitable for fine mechanical workshops, toolmaking and first‑article inspection where small internal diameters must be verified reliably. Classified in the Mikro segment, the instrument balances compactness and stiffness, making it especially useful for confined bores and precision components. For best results, verify the setting ring before measurement sequences and use the extension set where bore depth exceeds the instrument body; the matt finish on scale and vernier improves readability under typical workshop lighting.

For precise micro‑bore metrology trust the Metav IndustryLine offering — contact Metav Werkzeuge to discuss delivery of the M312.130 with its setting ring, extension options and transport case

Technical data

• Article number: M312.130
• GTIN: 4054469119434
• Measurement range: 6–8 mm
• Standard: DIN 863
• Reading step: 0.001 mm
• Accuracy: ±0.004 mm
• Length: 55 mm
• Delivered in transport case
• Accessories included: setting ring Ø8 mm, extension 100×Ø5.7
• Suitable for blind‑hole measurement
• Scale and vernier matt chrome‑plated
• Analog vernier instrument
• Customs tariff number: 90173000

Numerical data

• Minimum range: 6 mm
• Maximum range: 8 mm
• Reading resolution: 0.001 mm
• Specified accuracy: ±0.004 mm
• Length: 55 mm

Special features

• Three‑point measuring head for secure centring
• Micro‑range design for fine mechanical work
• Supplied setting ring for quick calibration
• Extension rods for deeper blind bores
• Matt chrome non‑reflective finish
• Conforms to DIN 863
• Delivered in a protective transport case

FAQ

What diameter range does this instrument cover?
The instrument measures internal diameters from 6 to 8 mm and is designed specifically for fine‑pitch, micro‑range checks typical in precision workshops.

Can the gauge be used for blind‑hole measurement?
Yes. The M312.130 is suitable for blind‑hole measurement and is supplied with extension rods to reach deeper bores.

How is the instrument calibrated on delivery?
A setting ring Ø8 mm is included for immediate calibration checks; the setting ring and supplied accessories allow reproducible adjustment before inspection.

What level of accuracy and resolution can be expected?
The gauge provides a reading step of 0.001 mm with a declared accuracy of ±0.004 mm, sufficient for many precision quality‑control tasks in the micro‑range.

Which standard does the instrument follow?
The instrument is manufactured to the requirements of DIN 863, ensuring compatibility with established micrometer conventions.

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