20-50mm Three-Point Internal Micrometer Digital, Measuring Drum with Scale, IP65 - Metav IndustryLine

Precision, robust ingress protection and a compact measurement range combine to ensure reliable internal‑diameter checks for production and inspection. The digital readout with a 0.005 mm resolution and the three‑point centralising system provide repeatable results for blind‑hole measurements; order the M312.276.M three‑point internal micrometer set directly via Metav Werkzeuge or ask our consultants if needed.

M312.276.M — Three‑point internal micrometer set, 20–50 mm, digital, IP65 (Metav IndustryLine)

The M312.276.M is a digital three‑point internal micrometer set for precision measurement of internal diameters and blind holes in workshop and production environments, supplied as a four‑piece set with setting ring and extensions.

• Digital readout with 0.005 mm resolution
• Three‑point centralising measuring principle
• IP65 protection for workshop environments
• Delivered as 4‑piece set with case and extensions

Reliable centring and repeatable results for blind holes

The three‑point measuring principle ensures automatic centralisation inside bores and blind holes, reducing operator influence and improving reproducibility. With a displayed resolution of 0.005 mm, the instrument supports fine adjustments and fast pass/fail decisions at incoming inspection or during assembly checks. The integrated measuring drum with scaling assists in coarse setting and visual control, while the digital interface with ON/OFF/SET and ABS/INC/UNIT functions caters for simple zeroing, incremental work and unit changes.

Built for workshop use — robust, protected and ready to handle

Constructed to meet DIN 863, the instrument combines a matt‑chrome scale and hardened measuring faces for durability under regular use. The set is rated IP65, protecting the electronics from dust and low‑pressure water jets, which preserves accuracy in harsher shop conditions. Delivery in a protective case with setting ring and two extension rods (150×Ø11.7 and 150×Ø23.4) safeguards the components in transit and keeps the set organised on the bench, simplifying tool storage and transport.

Practical range and accessories that speed up inspection

Covering the 20–50 mm measuring range, the set addresses common internal diameters in mechanical engineering and maintenance tasks without frequent instrument changes. Supplied as a four‑piece set, the components allow measurement across the interval with minimal recalibration. The included setting ring and the adjustment configuration (einstellring 25+40) permit quick verification against standards; the model also supports a data output interface RB 4.1 for integration into inspection routines and data logging when required.

Improve throughput with focused metrology tools

Using a purpose‑built internal micrometer set streamlines routine checks by combining mechanical centring, a readable analogue drum and a precise digital readout — a balance of tactile control and numerical certainty. This configuration reduces cycle times at the inspection station and lowers the risk of rework caused by mismeasured bores. For workshops seeking consistent internal‑diameter control, the set represents a pragmatic investment in measurement quality and process reliability.

Contact Metav Werkzeuge for tailored technical advice or to arrange supply of the Metav IndustryLine M312.276.M three‑point internal micrometer set for workshop or production inspection tasks

Technical Data

• Article number: M312.276.M
• GTIN: 4054469162461
• Weight: 4.9 kg
• Standard: DIN 863

Facts

• Measuring range: 20–50 mm
• Resolution (display): 0.005 mm
• Set composition: 4 pieces per set
• Protection class: IP65

Special features

• Digital display with ON/OFF/SET and ABS/INC/UNIT
• Measuring drum with scaling
• Matt‑chrome scale and vernier
• Hardened measuring faces
• Suitable for blind‑hole measurements
• Includes setting ring and extensions (150×Ø11.7, 150×Ø23.4)
• Data output: RB 4.1
• Delivered in protective case

FAQ

What measurement range does the set cover?
The set covers a measuring range of 20–50 mm, which is suitable for many common internal‑diameter checks in workshops and production.

Is this instrument suitable for blind‑hole measurements?
Yes — the three‑point centring principle of the M312.276.M is specifically designed to measure blind holes and ensure consistent centralisation.

How precise is the displayed reading?
The digital readout offers a resolution of 0.005 mm, providing fine increments for accurate inspection and adjustment.

Does the set include accessories for calibration and extension?
The M312.276.M is supplied with a setting ring and two extensions (150×Ø11.7 and 150×Ø23.4) to facilitate verification and extend the usable range.

Can measurement data be exported for documentation?
The instrument supports a data output interface marked RB 4.1 for connection to compatible data‑logging systems.

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