25mm Disc Micrometer With Ø20mm Anvil, Ratchet Stop, Painted Frame, Matt Chrome Thimble - Metav IndustryLine

Combining a compact 0–25 mm measuring range with Ø20 mm disc faces and ±0.004 mm accuracy, this instrument is tailored for repeatable, fine‑tolerance checks in precision workshops. Order the M309.250 directly via Metav Werkzeuge or consult their specialists for integration guidance.

M309.250 Disc‑Face Outside Micrometer — 0–25 mm, Ø20 mm faces (Metav IndustryLine)

The M309.250 is a compact disc‑face outside micrometer designed for precise dimensional checks on small parts and assemblies in fine engineering and watchmaking environments.

• 0–25 mm measuring range
• Ø20 mm disc measuring faces
• High accuracy ±0.004 mm
• Ratchet stop for reproducible pressure

Precision and repeatability for fine engineering

The instrument delivers a clear technical advantage through its combination of high resolution and low measurement error: analogue reading 0.01 mm paired with a verified accuracy of ±0.004 mm ensures reliable results when documenting component dimensions. The micrometer’s non‑rotating spindle reduces the risk of marking delicate surfaces while the ratchet stop enforces a consistent measuring force, lowering operator‑induced scatter. These characteristics make the tool particularly suited to tasks where traceable repeatability and short‑term control measurements are required in production and inspection routines.

Compact design that supports delicate workpieces

Classified in the micro range (max. measuring span within 10–100 mm), this device is optimised for short‑reach applications where stiffness and manoeuvrability matter most. The small frame and Ø20 mm disc faces keep the measuring points rigid and minimise lever effects, which benefits measurements on small shafts, rings and precision fittings. A matt‑chromed thimble enhances legibility under workshop lighting, while the painted frame offers corrosion protection and a tactile surface for steady hand control. The combination of compact geometry and robust finish supports frequent handling without sacrificing dimensional stability.

Practical use and process integration

As an analogue outside micrometer, the unit integrates into established inspection workflows with minimal training: readings are immediate, no power source is required and maintenance is limited to routine cleaning and lubrication of the spindle thread. The instrument’s construction—painted frame and matt‑chromed thimble—balances durability with tactile feedback for repetitive checks. Its modest mass aids single‑handed operation while the ratchet mechanism protects delicate parts from over‑torque. For quality assurance, results can be logged manually or transferred into existing documentation systems.

Delivery and workshop readiness

The micrometer is supplied ready for transport and protected against transit damage by delivery in a purpose case. The combination of compact footprint and straightforward handling reduces setup time at inspection stations and simplifies storage. Given its technical specification—fine resolution, ±0.004 mm accuracy and a 0–25 mm measuring range—the instrument supports high‑precision tasks in toolrooms, calibration benches and small‑parts production where reproducible dimensional control underpins overall product quality.

For reliable small‑part measurement and consistent workshop performance, choose the Metav IndustryLine M309.250 and contact Metav Werkzeuge in Emmerich for tailored procurement advice.

Technical data

• Article number: M309.250
• GTIN: 4054469118697
• eClass: 21170328
• ETIM: EC003590
• Customs tariff number: 90173000

Facts

• Measuring range: 0–25 mm
• Resolution (reading): 0.01 mm
• Accuracy: ±0.004 mm
• Measuring face diameter: Ø20 mm
• Weight: 0.5 kg

Special features

• Analogue outside micrometer
• Frame: painted
• Thimble: matt chrome
• Non‑rotating spindle
• Ratchet stop for reproducible measuring force
• Supplied in a transport case

FAQ

How precise is the micrometer in typical use?
The M309.250 provides an analogue reading to 0.01 mm with an indicated accuracy of ±0.004 mm, making it suitable for fine workshop checks and short‑range inspection tasks.

What measuring faces does the instrument use?
The micrometer is fitted with Ø20 mm disc measuring faces, which give a stable contact area for small rings, shafts and flat surfaces while keeping the contact geometry compact.

Does the spindle rotate during measurement?
No; the spindle is non‑rotating, which reduces surface abrasion on delicate parts and improves repeatability when combined with the ratchet stop.

Is the device delivered ready for workshop use?
Delivery includes a transport case for protection in transit. The product data does not specify a factory calibration certificate in the available information.

Which applications suit this micrometer best?
Its classification in the micro measuring range and compact design make it ideal for watchmaking, precision engineering, toolroom checks and small‑parts production where tight tolerances must be verified.

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