25 mm Ceramic Gauge Ball (Si3N4) 0.003 mm Accuracy, HV1400-1700 Hardness - Metav IndustryLine

This ceramic gauge ball combines silicon nitride construction, 0.003 mm accuracy and exceptional surface quality to deliver durable, repeatable contact points for master gauges and precision fixtures. Order the measuring ball directly via Metav Werkzeuge or consult our specialists for application advice.

Measuring ball M318.447 — 25 mm silicon nitride gauge ball, 0.003 mm accuracy (Metav IndustryLine)

The Measuring ball M318.447 is a 25 mm silicon nitride gauge ball engineered for use as a master contact in high‑precision metrology, calibration rigs and reference fixtures.

• Silicon nitride (Si3N4) for thermal stability
• Diameter 25 mm with ±0.00008 mm tolerance
• High surface finish Ra 0.00001 for repeatable contact
• Hardness HV1400–1700 resists wear

Durable ceramic construction for stable reference points

The ceramic composition — silicon nitride (Si3N4) — offers a combination of low thermal expansion, corrosion resistance and high mechanical strength that makes the sphere ideal as a stable reference in shop and laboratory environments. Compared with steel, the material reduces dimensional drift under temperature changes and withstands contact wear thanks to hardness HV1400–1700, which extends service life and keeps calibration intervals predictable. This robustness translates into fewer replacements and lower lifecycle costs for inspection setups.

Measured precision and what it means in practice

With a calibrated accuracy of 0.003 mm and a diameter tolerance of ±0.00008 mm, the sphere provides a reliable datum for gauge blocks, probe tips and comparator systems. The extremely low surface roughness Ra 0.00001 ensures consistent contact mechanics: probe deflection and local deformation are minimised, improving repeatability of single‑point measurements. Where tight form and contact quality are required, this level of finish reduces scatter in repeated readings and supports traceable quality control processes.

Integration, handling and typical applications

At 25 mm diameter and a weight of 0.08 kg, the ball suits both handheld gauge assemblies and fixed master fixtures without adding excessive mass. The geometry and finish make it suitable for use in master gauges, tactile probe calibration, slip gauges and precision fixture contact points. The compact size aids quick interchange in comparator chains, while the wear‑resistant surface maintains measurement integrity over long runs. For bespoke setups, the component’s stability supports reproducible measurement chains and minimises downstream rework.

For assured precision procurement of the Metav IndustryLine M318.447 measuring ball, contact Metav Werkzeuge GmbH in Emmerich for ordering and technical consultation — phone +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• Article number: M318.447
• GTIN: 4054469184449
• Category: Gauges

Facts

• Diameter: 25 mm
• Accuracy: 0.003 mm
• Diameter tolerance: ±0.00008 mm
• Weight: 0.08 kg
• Hardness: HV1400–1700
• Surface roughness: Ra 0.00001

Special features

• Material: Silicon nitride (Si3N4)
• Application: Master gauge, probe calibration, reference contact point
• Low thermal expansion for dimensional stability
• High wear resistance for extended service life

FAQ

What level of accuracy does the measuring ball offer?
The measuring ball provides an accuracy of 0.003 mm, suitable for precision metrology and master gauge applications where tight dimensional control is required.

Is the material suitable for repeated contact with probe tips?
Yes. The silicon nitride (Si3N4) composition and hardness HV1400–1700 ensure excellent wear resistance for repeated probe contact and extended service life.

Can the ball be used as a master reference in a calibration chain?
The 25 mm diameter unit is intended for use as a master contact or reference sphere in calibration rigs and comparator chains, offering stable, repeatable results.

What benefit does the surface roughness provide?
The very low Ra 0.00001 finish reduces contact variability and local deformation, improving measurement repeatability with tactile probes and slip gauge systems.

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