12–16 mm Extension for Three-Point Internal Measuring Screw, M8.5 x 0.5 mm - Metav IndustryLine

A precise extension that adapts three‑point internal micrometres from the Series 312.675 to common small internal ranges, combining stable attachment and workshop‑grade resilience. Order the accessory directly via Metav Werkzeuge or consult the specialists for compatibility and fitment advice.

Extension for Three‑Point Internal Micrometre M312.671 — Series 312.675, for 12–16 & 16–20 mm ranges, Metav IndustryLine

The Extension for Three‑Point Internal Micrometre M312.671 is a precision accessory designed to extend the effective measuring range of three‑point internal micrometres for close, reliable internal measurements in small bores.

• Compatible with Series 312.675 instruments
• Suitable for 11–20 mm internal ranges
• Threaded attachment for secure mounting
• Robust build for regular workshop use

Extend reach while preserving measurement quality

The extension is engineered to increase the practical measuring reach of three‑point internal measuring heads without compromising precision. By providing an intermediary extension stage, the accessory preserves the original calibration characteristics of the measuring head and reduces handling changes during the measurement sequence. Compatibility with standard small internal steps (11–14 mm; 12–16 mm; 14–17 mm; 16–20 mm; 17–20 mm) makes the component suitable for repetitive checks on small bores, where reproducibility and a steady measuring setup are decisive for consistent results. The design focuses on dimensional stability to keep the influence of lever effects to a minimum.

Secure mounting and reliable workshop performance

A mechanically robust threaded connection delivers repeatable fixation in the measuring chain, increasing resistance to vibration and torque from handling during inspection tasks. The extension’s build quality addresses common workshop stresses and supports routine use on the shop floor. The listed mass of 1.3 kg contributes to a stable assemblage when mounted, while the construction materials and finish ensure low maintenance and sustained functionality in daily metrology tasks. This balance of robustness and precision helps maintain throughput in quality control and assembly operations.

Fast integration with existing metrology setups

Designed as an accessory for three‑point internal micrometres of Series 312.675, the component integrates with established measuring routines and minimises downtime during changeover. The extension functions as a practical adapter, allowing technicians and inspectors to switch measuring ranges without replacing the measuring head, which streamlines inspection workflows and reduces inventory of complete instruments. Labelling and mechanical tolerances follow industrial metrology conventions to enable predictable performance in coordinated measurement tasks.

Practical suitability and target applications

The accessory is aimed at machine shops, toolrooms and quality departments that process small internal diameters and require repeatable checks without investing in additional complete micrometres. Typical applications include inspection of bores in turned parts, gauging within assemblies and spot checks during production runs. As a purpose‑built extension, it supports efficient measurement cycles and contributes to reliable quality documentation when used as part of a controlled inspection procedure.

For tailored advice on mechanical fitment or to obtain this extension from Metav Werkzeuge, contact our Emmerich team by email at info@metav-werkzeuge.com or by phone on +49 2822 7131930 — the specialists will confirm compatibility and dispatch options.

Technical Data

• Article number: M312.671
• GTIN: 4054469120287
• Manufacturer: Metav IndustryLine
• eClass: 21019104
• ETIM: EC002219

Measurements & core data

• Suitable measuring ranges: 11–14 mm; 12–16 mm; 14–17 mm; 16–20 mm; 17–20 mm
• Weight: 1.3 kg
• Tariff code: 90173000
• Extension dimension (as listed): 100 x Ø11.7

Special features

• Compatibility: Series 312.675 three‑point internal micrometres
• Threaded attachment for secure mounting (manufacturer‑specific)
• Application: accessory for internal measurement and range extension
• Category: Measuring instrument accessory (Zubehör)

FAQ

Is this extension compatible with all three‑point internal micrometres?
Compatibility is specific to three‑point internal micrometres of Series 312.675; the extension is intended for that family of measuring heads and similar fittings.

Which internal ranges can be achieved with the extension?
The accessory covers standard small internal steps listed as 11–14 mm, 12–16 mm, 14–17 mm, 16–20 mm and 17–20 mm when combined with the appropriate three‑point measuring head.

Does the extension affect measurement accuracy?
When mounted correctly the extension is designed to maintain the original measuring head’s performance and minimise additional influence; correct fixation and handling remain essential for repeatable results.

Can the extension be used in production environments?
Yes. The component is built for regular workshop use and supports routine inspection tasks in machine shops, toolrooms and quality control environments.

How is the extension supplied and identified?
The accessory is supplied as an item for the Series 312.675 family and is identified by article number M312.671 and GTIN 4054469120287.

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