21 mm Gauge Ball Pair Hardened Chrome Steel 0.003 mm Accuracy, Diameter Tolerance 0.00008 mm - Metav IndustryLine

Benefit from the combination of hardened chrome steel (>HRC 62), a precise 21 mm diameter and outstanding 0.003 mm accuracy for reproducible reference measurements. Order the gauge ball pair directly via Metav Werkzeuge or ask our consultants if needed.

Gauge ball pair M318.451 — 21 mm, hardened chrome steel, 0.003 mm accuracy (Metav IndustryLine)

The gauge ball pair M318.451 is a compact reference set designed for high-precision inspection, calibration and gauging tasks in metrology and production control.

• Hardened chrome steel >HRC 62
• Accuracy 0.003 mm
• Diameter 21 mm, tight tolerance
• Supplied as a set of two

Reproducible reference points for inspection

The pair of precision spheres provides stable and repeatable contact points for tactile probes, calibration stands and fixture set-ups. With a nominal 21 mm diameter and an accuracy of 0.003 mm, the spheres serve as traceable reference features that reduce measurement scatter and simplify alignment procedures. This level of dimensional certainty supports reliable comparative checks and improves process control across serial inspection tasks.

Material quality and surface integrity for long-term use

Manufactured from hardened chrome steel, the spheres combine high wear resistance with dimensional stability; the specified hardness >HRC 62 minimises plastic deformation under repeated contact. The finished surface exhibits an extremely fine texture (surface roughness 0.00001) and a diameter tolerance of 0.00008 mm, which together reduce local contact variability and preserve probe tip condition. The result is consistent probe readings and fewer recalibrations over the life of the product.

Practical integration into metrology workflows

Delivered as a set of two, the components are ready for immediate use in comparative setups, lateral referencing or as paired datum elements in fixture verification. Their compact design and measured mass make them easy to mount in standard holders or magnetic bases, while the clear identification (SKU M318.451, GTIN visible) facilitates asset tracking and inventory control. Use the spheres as fixed reference elements to streamline inspection routines and shorten setup time in both workshop and laboratory environments.

For procurement or expert recommendations on the Metav IndustryLine gauge ball pair, contact Metav Werkzeuge in Emmerich for reliable delivery and tailored technical advice.

Technical Data

• SKU: M318.451
• GTIN: 4054469184197
• Brand: Metav IndustryLine

Core measurements

• Diameter: 21 mm
• Accuracy: 0.003 mm
• Diameter tolerance: 0.00008 mm
• Surface roughness: 0.00001
• Hardness: >HRC 62
• Weight: 0.1 kg
• Pieces per set: 2

Materials & features

• Material: hardened chrome steel
• Supplied as a pair for reference and calibration
• High surface finish for reduced contact variability
• ECLASS: 21170133

FAQ

What is the primary use of these spheres?
The gauge ball pair is intended as reference and calibration spheres for inspection tasks, providing reproducible contact points for tactile probes and fixture verification.

How precise are the gauge balls in practice?
Each sphere offers an accuracy of 0.003 mm and a diameter tolerance of 0.00008 mm, making the set suitable for high-precision measuring applications where repeatability is crucial.

What material and hardness are specified for the spheres?
The spheres are made from hardened chrome steel with a hardness above HRC 62, combining wear resistance with dimensional stability for long service life.

Are the items supplied as single pieces or a set?
The item is supplied as a set of two spheres (pieces per set: 2), allowing immediate use in paired-reference and comparative setups.

How are the spheres identified for inventory and traceability?
The product is identifiable by SKU M318.451 and GTIN 4054469184197, facilitating asset management and procurement records.

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