12-20mm Three-Point Internal Micrometer For Blind Holes With Setting Ring And Extension - Metav IndustryLine

Take advantage of the combination of three-point internal measurement, ±0.005 mm accuracy and practical accessory supply for reliable inspection in confined bores; order the set directly via Metav Werkzeuge or ask our consultants if clarification is required.

Dreipunkt-Innenmessschraube – three-point internal micrometer set (12–20 mm), analogue, Metav IndustryLine

Dreipunkt-Innenmessschraube is a compact three-point internal micrometer designed for precise measurement of blind holes and small bores in demanding workshop environments.

• 0.005 mm accuracy for fine measurement
• 12–20 mm measuring range
• Three-point design for blind-hole measurement
• Includes setting ring and extension

Precise micro-range measurement for blind bores

The three-point internal micrometer delivers repeatable internal diameters within a 12–20 mm span, classifying it in the Micro segment for extremely compact precision work. Its mechanical construction and hardened measuring faces reduce deformation and maintain stability when probing deep or restricted bores. With a stated accuracy of ±0.005 mm, the instrument is suited to fine mechanical inspection tasks where small deviations matter; the analogue nonius scale gives a direct, reliable readout and the matt chrome-plated scale and vernier resist glare in bright inspection areas.

Consistent results through simple adjustment and readout

Designed as a practical workshop tool, this analogue internal measuring screw is supplied as a two-piece set and includes a setting ring (Ø16 mm) plus an extension (100 × Ø11.7 mm) for measurements in deeper blind holes. The setting ring enables quick verification of the contact faces before series inspection, while the extension maintains alignment when access is limited. The combination of robust mechanical guidance and precise contact geometry reduces operator-induced scatter, supporting efficient quality checks and shorter inspection cycles.

Durable design that integrates with standard quality routines

Materials and finishing are selected for everyday workshop use: the scale and vernier are matt chrome-plated, and the measuring faces are treated for longevity. Supplied as a set, the tool covers the targeted measuring span without frequent tool changes, simplifying storage and traceability on the shop floor. At a weight of 1.3 kg for the complete set, handling is stable yet manageable during routine measurements. The construction supports integration into existing verification workflows and complements manual gauges and gauge blocks used in typical machine-shop inspection stations.

Contact Metav Werkzeuge for tailored advice on integrating the Metav IndustryLine three-point internal micrometer set into inspection routines and to secure the appropriate configuration for blind-hole measurement.

Technical data

• Article number: M312.685
• GTIN: 4054469120362
• eClass: 21170335
• ETIM: EC003590
• Customs tariff: 90173000

Facts

• Measuring range: 12–20 mm
• Accuracy: ±0.005 mm
• Weight: 1.3 kg
• Pieces per set: 2
• Setting ring: Ø16 mm
• Extension rods: 100 × Ø11.7 mm
• Analogue (nonius)
• Category: measuring micrometers

Special features

• Matt chrome-plated scale and vernier
• Hardened measuring faces
• Suitable for blind-hole measurement
• Includes setting ring and extension
• Delivered as a set

FAQ

How is the three-point internal micrometer used for blind holes?
The three-point internal micrometer measures internal diameters by expanding its contact tips to the bore walls; the supplied setting ring and extension allow the Dreipunkt-Innenmessschraube to be set and applied reliably in blind bores, preserving alignment during reading.

What measurement accuracy can be expected?
The instrument specifies an accuracy of ±0.005 mm, which places the tool in the fine-precision category suitable for demanding inspection tasks where deviations of a few micrometres are critical.

Does the set include accessories for deeper bores?
Yes. The set contains a setting ring (Ø16 mm) and an extension (100 × Ø11.7 mm), enabling secure measurement in deeper or hard-to-reach blind holes with consistent contact geometry.

For which applications is this measuring screw most suitable?
This compact measuring set is ideal for precision work in confined spaces: small-bore inspection, toolroom checks, fixture validation and micro-mechanical assemblies that require 12–20 mm internal verification.

How many instruments are delivered in the set?
The product is supplied as a two-piece set, providing coverage and convenience for bench inspection routines.

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