50-100mm Three-Point Internal Micrometer Set With Adjustment Ring And Extension, Chrome Scale - Metav IndustryLine

Benefit from precise 0.005 mm repeatability combined with a practical 50–100 mm measuring range and accessories for blind-hole inspection; order the set directly via Metav Werkzeuge or contact our consultants for tailored advice.

Three-point internal micrometer M312.687 — analogue inside micrometer set, 0.005 mm accuracy

The Three-point internal micrometer M312.687 is an analogue inside measuring instrument designed for repeatable diameter checks of blind-hole bores and medium-sized internal features, supplied as a four-piece set with adjustment ring and extension.

• Range 50–100 mm for medium internal measurements
• High precision with 0.005 mm accuracy
• Includes adjustment ring and extension
• Matt chrome-plated scale and vernier

Precision that reduces rework and speeds inspection

The three-contact measuring principle delivers a centred measurement that compensates for slight misalignment, making the instrument particularly effective for repeatable diameter checks in production and maintenance. With a stated accuracy of 0.005 mm, the gauge meets requirements beyond typical workshop tolerances and is suitable where reduced measurement scatter is critical. The analogue vernier gives a direct, mechanically robust reading without reliance on batteries or electronics, which simplifies continuous use at the inspection bench and lowers lifecycle complexity.

Designed for blind-hole measuring and everyday workshop use

Constructed for blind-hole bores, the instrument set includes an adjustment ring and a purpose-made extension (150×Ø21.8) that extend reach and adapt the tool to recessed features. The four-piece set covers a practical span of diameters so single-operator tasks and setup checks can be completed without frequent tool changes. The matt chrome-plated scale and vernier resist glare and remain legible under workshop lighting; hardened measuring faces ensure wear resistance and stable contact geometry for consistent readings across repeated cycles.

Practical handling, traceable configuration and robust workmanship

This instrument is classified in the standard measuring range category (max 100 mm), which balances reach with stiffness for reliable one-handed handling and stable positioning. The set format and included accessories support a smooth workflow: fewer tool swaps, clear mechanical adjustments and direct replacement of worn extensions if needed. The solid construction and clear scaling reduce the potential for operator-induced variation, while the three-point contact principle reduces sensitivity to eccentricity, yielding a measurement result that is closer to the true bore diameter than single-point probes.

Choose the Metav IndustryLine three-point internal micrometer for dependable blind-hole inspections and consult Metav Werkzeuge in Emmerich for specification matching and procurement assistance.

Technical data

• Article number: M312.687
• GTIN: 4054469120386
• ECLASS: 21170335
• ETIM: EC003590
• TARIC: 90173000

Facts

• Measuring range: 50–100 mm
• Accuracy: 0.005 mm
• Weight: 10.7 kg
• Pieces per set: 4
• Reading resolution (analogue vernier): 0.005 mm

Special features

• Analogue three-point internal micrometer
• Suitable for blind-hole bores
• Includes adjustment ring and extension (150×Ø21.8)
• Matt chrome-plated scale and vernier
• Hardened measuring faces
• Set for medium internal measurements

FAQ

What measurement range does the instrument cover?
The instrument covers a measuring range of 50–100 mm, supplied as a four-piece set designed for medium internal measurements.

How accurate is this three-point internal micrometer?
The three-point internal micrometer achieves an accuracy of 0.005 mm, offering repeatable results for inspection work beyond standard workshop tolerances.

Is the set suitable for blind-hole inspection?
Yes — the set is explicitly designed for blind-hole bores and includes an adjustment ring plus an extension (150×Ø21.8) to reach recessed features.

How is the scale finished and how does that help reading?
The scale and vernier are matt chrome-plated, reducing glare and improving legibility under workshop lighting conditions.

How many pieces are included in the delivery?
The delivery comprises a four-piece set, providing a practical span of sizes for internal diameter checks without frequent tool changes.

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