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

Combining hardened chrome‑steel durability, a true 21 mm working diameter and 0.003 mm accuracy, this gauge ball pair delivers repeatable reference points for fixture set‑up and precision inspection. Order the set directly via Metav Werkzeuge or consult our specialists for application guidance.

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

A gauge ball pair M318.451 designed as a compact reference for calibration, fixture alignment and high‑precision measurement tasks in inspection and toolmaking.

• Hardened chrome‑steel construction
• 21 mm nominal diameter for stable referencing
• 0.003 mm accuracy for tight tolerance work
• Roundness tolerance 0.00008 mm for reliable repeatability

Precision and material benefits for reliable references

The pair is manufactured from hardened chrome steel with a declared hardness of >HRC 62, providing strong wear resistance and stable geometry under repeated use. The 0.003 mm accuracy rating and fine surface quality result in a trustworthy datum for reference tests and comparative measurements. A set of two spheres ensures consistent cross‑checks and makes it straightforward to establish repeatable contact points in jigs, gauges and inspection fixtures.

What the tolerances mean for everyday metrology

With a roundness tolerance of 0.00008 mm and surface roughness down to 0.00001, the spheres offer very low form deviation and an exceptionally smooth contact surface. These characteristics reduce measurement uncertainty at the probe or comparator interface and improve repeatability when used as master points for setting up gauges or checking probing systems. Such precision is beneficial in quality control routines where small geometric deviations influence assembly fit or functional performance.

Practical handling, longevity and workshop integration

Compact and lightweight, the set is easy to position and to store when not in use; the nominal diameter of 21 mm makes the spheres compatible with most lookup fixtures and probe tips. The material choice and heat treatment promote long service life, keeping maintenance needs low and safeguarding measurement consistency over time. Supplied as a pair, the M318.451 facilitates direct comparison measurements and quick verification cycles on the shop floor or in a metrology lab.

Discuss the suitability of the M318.451 gauge ball pair with Metav Werkzeuge in Emmerich for tailored advice and dependable supply — email info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• SKU: M318.451
• GTIN: 4054469184197
• Material: Chrome steel, hardened
• Set: Pair (2 pieces)
• Mass: 21 mm nominal diameter

Facts

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

Special features

• Set of two precision gauge spheres
• High roundness and fine surface finish
• Suited for calibration, fixture alignment, reference points
• Compact format for easy handling

FAQ

What accuracy can be expected from these gauge balls?
The pair is specified at 0.003 mm accuracy with a diameter tolerance of 0.00008 mm, making them suitable as reference spheres for high‑precision checks and probe calibration.

What material and hardness are used for the spheres?
The spheres are made from hardened chrome steel with a declared hardness of >HRC 62, ensuring wear resistance and dimensional stability.

How many pieces are included and how are they used?
The product is supplied as a set of two balls; the set format supports comparative checks and quick establishment of repeatable contact points in gauges and fixtures.

Are these spheres suitable for use with coordinate measuring machines (CMMs)?
Yes — the fine roundness and low surface roughness make the spheres appropriate as reference points for probe checks and small‑scale alignment tasks on CMMs and inspection rigs.

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