50-100 mm Extension for Three-Point Internal Micrometer, M20 x 1.5 Thread - Metav IndustryLine

Take advantage of the precise fit and extended reach to adapt existing three-point internal measuring setups quickly and cost-effectively; the accessory’s standard M20 x 1.5 thread and compatibility with the 312.6XX series reduce tooling changes and minimise downtime. Order the extension directly via Metav Werkzeuge or consult Metav’s specialists for application advice.

Extension for three-point internal micrometer M312.673 — Extension for 50–100 mm range, M20 x 1.5 thread

The Extension for three-point internal micrometer M312.673 is an accessory that extends the measuring reach of three-point internal micrometers for the 50–100 mm range while maintaining mechanical alignment and repeatability

• Fits three-point internal micrometers 50–100 mm
• M20 x 1.5 standardised thread for secure mounting
• Compatible with series 312.6XX instruments
• Robust build suitable for workshop use

Increase measuring range without replacing the instrument

An extension provides a practical route to measure deeper bores or reach recessed features without the expense of a new gauge. The extension screws into the micrometer via the M20 x 1.5 thread, adding controlled length while preserving the original measuring geometry. For production environments this means fewer instrument changes, shorter setup times and a straightforward upgrade path that supports continuous operation. The accessory’s design focuses on maintaining precision and alignment so that measurement reproducibility remains high even after integrating the additional length.

Stable compatibility and predictable handling for micro-range work

Designed for compatibility with the 312.6XX family, the component is intended for measuring ranges that fall into the micro‑range (up to 100 mm) classification, where compactness and torsional stiffness matter. The extension’s mass (approx. 1.3 kg) and thread interface deliver a secure connection that reduces play and keeps the probe geometry stable during use. In practice this improves handling with smaller parts and tight bores commonly encountered in watchmaking, fine mechanical assemblies and precision inspection tasks, ensuring consistent results without complex fixturing.

Keep inspection workflows efficient and repeatable

Implementing an extension is a rational efficiency measure: it preserves the calibrated base instrument, extends its applicability and lowers capital expenditure compared with purchasing additional micrometers. The accessory is a practical tool for workshops and inspection stations that require occasional extended reach; it supports reliable measurements while simplifying tool inventory. Backed by Metav’s emphasis on accessible precision, the part integrates smoothly into routine quality-control procedures and helps keep throughput steady under varying production demands.

Contact Metav Werkzeuge for application guidance and to order the M312.673 extension—Metav’s specialists in Emmerich can confirm compatibility and advise on integration; email info@metav-werkzeuge.com or call +49 2822 7131930

Technical Data

• Article number: M312.673
• GTIN: 4054469120300
• Customs tariff number: 90173000

Facts

• Weight: 1.3 kg
• Thread: M20 x 1.5
• Suitable measuring range: 50–100 mm
• Extension dimension: 150 x Ø21.8 mm

Special features

• Compatible with three-point internal micrometer series 312.6XX
• Accessory category: Measurement device accessory
• Intended for extension of measuring reach and deeper bore access

FAQ

Is this extension compatible with three-point internal micrometers from the 312.6XX family?
Yes. The M312.673 extension is designed specifically for compatibility with the 312.6XX series and uses the standard M20 x 1.5 thread to ensure a secure fit.

Can the extension be used to measure bores beyond the standard micrometer range?
Yes. The accessory increases the effective measuring reach into the 50–100 mm band, enabling access to deeper or recessed features without replacing the base instrument.

Will mounting the extension affect measurement repeatability?
When correctly mounted to the M20 x 1.5 thread and used within its intended range, the extension preserves alignment and supports repeatable measurements by maintaining the probe geometry.

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