150 mm Extension For Three-Point Internal Measuring Screw Ø23 mm For 50–63 / 62–75 / 75–88 / 87–100 mm - Metav IndustryLine

Take advantage of the 150 mm extension and Ø23.4 mm nominal diameter to extend the measuring range of three‑point internal micrometers with secure M21 mounting; order the extension directly via Metav Werkzeuge or consult our specialists for matching system advice.

Extension for three‑point internal micrometers M312.107 — 150 mm length, Ø23.4 mm

The Extension for three‑point internal micrometers M312.107 provides a rigid, precision extension for internal measurement tasks, increasing reach for bores and deep features in workshop and production environments

• 150 mm extension length
• Diameter Ø23.4 mm
• Fits internal micrometers 50–100 mm ranges
• M21 thread for secure mounting

Increase reach while preserving measuring geometry

The 150 mm extension is designed to add reach without compromising the measuring geometry of three‑point internal micrometers. By keeping the contact geometry consistent, the accessory enables reliable internal measurements in deeper bores and cavities where the base instrument alone would not reach. The nominal Ø23.4 mm shaft diameter and recognised M21 thread ensure a positive mechanical connection to compatible instruments, reducing lateral play and preserving the instrument’s original repeatability. This extension is optimised for production environments where access and reproducible contact are decisive for inspection throughput.

Practical robustness for workshop and production use

Built for everyday handling, the extension balances rigidity with manageable mass (approx. 1.3 kg) so it can be installed and removed quickly while resisting bending under normal measuring forces. The secure thread interface reduces the need for frequent re‑adjustment, helping to maintain cycle times and avoid unnecessary rework. As an accessory intended for three‑point internal measuring systems, it is classified for accessory use in measuring setups and supports efficient metrology workflows in both maintenance and series inspection tasks.

Compatibility across common internal ranges

Compatibility with standard internal measuring ranges (50–63 mm, 62–75 mm, 75–88 mm and 87–100 mm) makes this extension a versatile addition to measurement benches that rely on modular internal micrometer systems. The component is specifically shaped to integrate with systems that use a three‑point contact arrangement, enabling measurement of stepped bores and deeper features without modifying the primary instrument. Where modularity and interchangeability matter, this extension provides a straightforward means to extend a single micrometer’s usable range.

Minimal impact on measurement practice, maximum usability

The accessory is intended to preserve the familiar handling and user routine of the parent instrument: mounting via the standard M21 thread keeps operation intuitive, while the defined shaft diameter and length offer predictable mechanical behaviour. Installation and removal require no special tooling beyond the normal handling procedure for internal micrometers, allowing measurement staff to adapt to longer reach tasks with minimal retraining. The design focus is on preserving measurement confidence and keeping process variability low.

Contact Metav Werkzeuge today for a quotation or configuration check and secure the M312.107 extension for your measurement setup

Technical data

• Article number: M312.107
• GTIN: 4054469161013
• Tariff number: 90173000
• Manufacturer: Metav IndustryLine

Numbers

• Length: 150 mm
• Nominal shaft diameter: Ø23.4 mm
• Thread: M21
• Weight: 1.3 kg
• Compatible measuring ranges: 50–63 mm; 62–75 mm; 75–88 mm; 87–100 mm

Special features

• Accessory for three‑point internal measuring systems
• Designed to extend measurement reach for internal measurement
• Category: Accessory (Measuring devices / Accessories)
• Compact, rigid shaft profile for stable mounting

FAQ

What measuring ranges does the extension cover?
The extension is suitable for internal measuring ranges 50–63 mm, 62–75 mm, 75–88 mm and 87–100 mm and is supplied under SKU M312.107.

How is the extension mounted to the micrometer?
Mounting is via an M21 thread; the M21 interface provides secure, repeatable attachment compatible with three‑point internal micrometer systems.

Will the extension affect measurement repeatability?
The extension is designed to preserve the parent instrument’s contact geometry and thus minimise any additional variability introduced by the increased reach.

Is the material specified in the product data?
The product data set does not specify the extension material.

Which product designation should be used when ordering?
Use the designation Extension for three‑point internal micrometers M312.107 when placing orders or referencing this accessory.

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