18 mm Measurement Balls Pair Hardened Chrome Steel 0.003 mm Accuracy, Tolerance 0.00008 mm - Metav IndustryLine

Benefit from precise reference geometry and high surface quality: the hardened chrome steel gauge ball pair delivers stable contact points and repeatable results, combining 18 mm diameter and 0.003 mm accuracy for reliable inspection tasks. Order the gauge ball pair directly via Metav Werkzeuge or ask our consultants if needed.

Gauge Ball Pair M318.428 — 18 mm, 0.003 mm accuracy (Metav IndustryLine)

The Gauge Ball Pair M318.428 serves as a precision reference for alignment, calibration and gauge-making tasks in inspection and metrology environments.

• Hardened chrome steel construction
• 0.003 mm geometric accuracy
• High surface quality Ra 0.00001 mm
• Delivered as a matched set of two

Engineered reference points for repeatable inspection

The set of precision spheres provides stable, well characterised contact points for comparative gauges and alignment rigs. Manufactured from hardened chrome steel and heat-treated to >HRC 62, the pair resists wear and maintains form under repeated loading, so fixtures and master gauges retain their reference over long service intervals. The combination of 18 mm diameter and a diameter tolerance of 0.00008 mm ensures that mounting and contact geometry remain consistent between measurements, reducing rework and inspection time.

Measurable accuracy that integrates with production workflows

Designed for metrology use, the spheres feature a declared accuracy of 0.003 mm, making them suitable as reference elements in calibration benches and comparative inspection tools. The exceptionally low surface roughness (0.00001 mm) reduces contact hysteresis and improves reproducibility when paired with tactile probes or optical comparators. Thanks to their compact mass (0.08 kg per set), the spheres are simple to handle while providing stable, repeatable results that support faster decision-making on the shop floor.

Clear advantages for toolmakers and quality labs

As a matched pair, the components simplify the setup of comparative gauges and go/no‑go fixtures: matched geometry reduces balancing and alignment steps during tooling changes. The robust chromium steel substrate and hardened finish lengthen service intervals and lower the frequency of replacements. For calibration and traceability, the items are supplied as a set, which supports controlled measurement chains in both production and laboratory contexts.

Practical use cases and compatibility

Typical applications include gauge fabrication, end‑of‑line inspection, spindle and fixture alignment, and reference points for CMM fixturing. The spheres are compatible with tactile probing systems and mechanical contact fixtures, where form accuracy and surface quality directly influence measurement uncertainty. The matched set format streamlines inventory and reduces downtime during fixture assembly.

Contact Metav Werkzeuge for the Metav IndustryLine gauge ball set M318.428 to discuss calibration certificates, delivery options and suitability for specific inspection setups.

Technical Data

• Article number: M318.428
• GTIN: 4054469184166
• SKU: M318.428

Facts

• Diameter: 18 mm
• Accuracy: 0.003 mm
• Diameter tolerance: 0.00008 mm
• Weight (set): 0.08 kg

Special features

• Material: hardened chrome steel
• Hardness: >HRC 62
• Surface roughness: 0.00001 mm
• Set: 2 balls

FAQ

What accuracy can be expected from these gauge balls?
The Metav IndustryLine gauge ball pair offers a declared accuracy of 0.003 mm, making the spheres suitable as reference elements in calibration benches and inspection fixtures.

Are the spheres supplied as a matched pair?
Yes, the set is delivered as two matched precision spheres (set of two), which simplifies assembly of comparative gauges and alignment fixtures.

Which materials and hardness apply to these balls?
The balls are manufactured from hardened chrome steel with a hardness exceeding HRC 62, providing high wear resistance for repeated contact measurements.

Can these balls be used with tactile probes and CMMs?
The high surface quality and tight geometric tolerance make the spheres compatible with tactile probing systems and mechanical fixtures used in dimensional inspection.

Is traceability or calibration documentation included?
Calibration or traceability documentation details can be requested; contact Metav Werkzeuge for specific certificates and calibration options related to the Metav IndustryLine set.

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