175–200mm Bowl Anvil Micrometer Ø30mm Measuring Face, Ratchet Stop, Painted Frame, Matt Chrome Drum - Metav IndustryLine

Take advantage of the combination of high accuracy (0.007 mm), a practical measuring range of 175–200 mm, and a ratchet drive that ensures repeatable contact for reliable production checks; order the disc micrometer directly via Metav Werkzeuge or contact our consultants for application advice.

M309.257 Disc Micrometer — Standard-range micrometer with ratchet and Ø30 mm disc anvils

The M309.257 disc micrometer is a robust analogue instrument designed for workshop and production use, offering precise thickness and outside-diameter checks in the 175–200 mm range.

• Measuring range 175–200 mm
• Accuracy 0.007 mm
• Ratchet spindle for consistent force
• Non-rotating spindle and Ø30 mm discs

Reliable precision for repeatable production checks

The instrument delivers a verified accuracy of 0.007 mm with a reading resolution of 0.01 mm, which places it well above common workshop standards and reduces rework from measurement uncertainty. The analogue scale is easy to interpret while the ratchet mechanism controls contact pressure, producing consistent results across repeated measurements. This combination supports efficient quality control in standard machining and assembly tasks, improving throughput by cutting down on measurement variability.

Built for stable handling and long service life

A painted frame contributes mechanical durability and corrosion resistance in everyday shop environments, while the matt‑chrome thimble reduces glare for clearer readings. The device’s non‑rotating spindle stabilises the contact surface during measurement, and the Ø30 mm disc anvils suit flat and slightly curved surfaces, giving reliable support for sheet, flange and component edge checks. The overall construction balances stiffness and manoeuvrability so that routine checks remain quick and reproducible.

Practical design that speeds up inspection routines

The integrated ratchet drive prevents over‑tightening and shortens the learning curve for operators, which is particularly useful on mixed‑skill teams. The instrument’s mass and form — around 2.2 kg — lend a reassuring feel that helps stabilise measurements, especially near the upper end of its range. Designed as a standard‑range micrometer, it fills the gap between compact gauges and larger long‑range instruments, making it a versatile choice for general tooling, fixtures and component batches.

Where this micrometer fits into workshop workflows

Specified for general machine‑shop and inspection tasks, the tool is ideal for routine dimensional checks on castings, turned parts and assemblies where a 175–200 mm span is required. The mechanical design minimises operator influence and supports rapid sampling during setup and production runs. For purchases intended as part of a broader metrology roll‑out, the product integrates neatly with conventional inspection procedures and can be used alongside calipers and gauges for cross‑checks and calibration chains.

For tailored advice or to secure supply from Metav Werkzeuge in Emmerich, contact our sales team at info@metav-werkzeuge.com or call +49 2822 7131930 — our specialists will recommend the right measuring set-up for the intended application

Technical data

• SKU: M309.257
• GTIN: 4054469118765
• Category: Messschrauben
• Label: Teller-Mess ND 175 - 200 mm, Ø30 mm

Numbers / Core technical data

• Measuring range: 175–200 mm
• Accuracy: 0.007 mm
• Resolution (reading): 0.01 mm
• Weight: 2.2 kg
• Anvil diameter: Ø30 mm
• Tariff number: 90173000

Special features

• Analog device
• Ratchet spindle
• Non-rotating spindle
• Painted frame
• Matt-chrome measuring drum
• Material: painted frame and matt-chrome thimble
• Category path: Messgeräte › Messschrauben

FAQ

What is the measuring range of this micrometer? The micrometer covers a measuring range of 175–200 mm, making it a standard‑range instrument for workshop and production checks.

How fine is the measurement resolution and how accurate is it? The instrument has a reading resolution of 0.01 mm and an accuracy of 0.007 mm, providing reliable repeatability for routine quality control.

Does the micrometer include a ratchet and why is that useful? Yes, the micrometer features a ratchet spindle; the ratchet ensures consistent contact force, which improves repeatability during successive measurements with the M309.257.

Which surfaces are the disc anvils suitable for? The Ø30 mm disc anvils are suitable for flat and slightly curved surfaces such as sheet metal edges, flanges and component faces commonly inspected in machining and assembly.

Is this micrometer suitable for general workshop metrology? Yes, as a standard‑range micrometer the device is optimised for everyday applications in machine shops and inspection rooms where a 175–200 mm span is required.

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