20 mm Gauge Ball Pair Hardened Chrome Steel, 0.003 mm Accuracy, Ø Tolerance 0.00008 mm - Metav IndustryLine

Take advantage of the combination of high hardness, sub-micron accuracy and a compact matched set for dependable gauge work; order the precision pair directly via Metav Werkzeuge or consult our specialists for application advice.

Gauge Ball Pair M318.430 — 20 mm hardened chrome steel, 0.003 mm accuracy

The Gauge Ball Pair M318.430 is a precision calibration set designed for dimensional checks, gauge fixtures and metrology applications in industrial workshop environments.

• Hardened chrome steel >HRC 62
• Matched pair, diameter 20 mm
• Accuracy 0.003 mm for tight tolerances
• Diameter tolerance 0.00008 mm

Faster, measurable inspection with precision spheres

The pair of gauge balls offers a clear efficiency advantage: with a 20 mm diameter and 0.003 mm nominal accuracy, routine checks and fixture calibrations become faster and more reproducible. These spheres serve as standardised reference artefacts for runout checks, bearing seats and positioning systems, enabling measurable reductions in inspection time and rework. The documented tolerance and surface finish make it straightforward to integrate the components into quality-control routines and automated measurement sequences.

Durable material for repeatable results

Manufactured from hardened chrome steel and specified at >HRC 62, the spheres resist wear and maintain geometry under repeated contact and fixturing. The high surface integrity, indicated by a surface roughness of 0.00001 mm, supports consistent contact readings and minimises measurement scatter. This construction translates into long-term stability when used as calibration references or gauge contacts, reducing the need for frequent replacement and preserving traceability in inspection chains.

Practical handling and workshop compatibility

Supplied as a matched set of two, the pair balances convenience and functionality for comparative checks and fixture alignment. The compact mass (approx. 0.08 kg) and standard size make them compatible with common gauge holders and custom fixtures, while their tight diameter tolerance (0.00008 mm) supports precision positioning tasks. The matched pairing simplifies comparative measurements and setting operations on measurement benches, coordinate measuring machines and manual gauges.

Clear technical basis for confident use

Key technical characteristics—diameter, tolerance, surface finish and hardness—are specified to enable correct selection for a given measurement task. Where interchangeability and repeatable contact conditions matter, these spheres function as reliable reference points for verification and alignment. Documentation of the core specifications supports conformity assessments and helps engineering teams define appropriate measurement uncertainty budgets.

For precision gauge and fixture work, contact Metav Werkzeuge in Emmerich for application guidance or order the M318.430 matched gauge ball pair through our consultants.

Technical data

• Article number: M318.430

• GTIN: 4054469184302

• Material: hardened chrome steel

• Diameter: 20 mm

• Nominal accuracy: 0.003 mm

• Diameter tolerance: 0.00008 mm

• Surface roughness: 0.00001 mm

• Hardness: >HRC 62

• Weight: 0.08 kg

• Pieces per set: 2

Applications & features

• Matched pair for comparative measurement and fixture alignment
• Designed for gauges, calibration artefacts and precision checks
• Compact reference spheres for CMM and bench inspection
• Suitable where repeatable contact and low wear are required

FAQ

What materials are the gauge balls made from?
The gauge balls are manufactured from hardened chrome steel, providing wear resistance and stable contact behaviour for precision measurement tasks.

What level of accuracy can be expected in use?
The matched pair is specified to 0.003 mm nominal accuracy, with a diameter tolerance of 0.00008 mm, suitable for tight calibration and gauge checks.

Are these spheres suitable for coordinate measuring machines (CMMs)?
Yes, the dimensional stability and surface finish of the spheres make them appropriate as reference artefacts for CMM probing and alignment routines.

How are the spheres supplied?
The item is supplied as a set of two matched gauge balls, enabling comparative measurements and simplified fixture set-up.

What does the surface roughness specification mean for measurement?
A surface roughness of 0.00001 mm indicates an exceptionally smooth contact surface, which reduces probe-induced variability and improves repeatability.

Can these gauge balls be used for runout and bearing seat checks?
Yes, the combination of precise diameter, tight tolerance and hardened material suits runout testing and verification of bearing seats.

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