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

Benefit from a matched pair of hardened reference spheres offering 12 mm diameter, 0.003 mm accuracy and an ultrafine surface finish for repeatable, traceable checks in inspection and fixture set‑up. Order the pair via Metav Werkzeuge or consult our specialists for application advice.

Gauge Ball Pair M318.422 – 12 mm hardened chrome steel, 0.003 mm accuracy (Metav IndustryLine)

The Gauge Ball Pair M318.422 is a compact metrology accessory for precision reference and comparative measurement in gauges, fixtures and calibration routines.

• 12 mm diameter with 0.003 mm accuracy
• Hardened chrome steel, >HRC 62
• Matched pair for reference and calibration
• Surface roughness Ra 0.00001

Precise reference for inspection and fixture alignment

The pair of precision spheres serves as a stable reference for dimensional checks, runout tests and alignment procedures. With a declared accuracy of 0.003 mm and a diameter tolerance of 0.00008 mm, the parts provide consistent, reproducible contact points for comparative gages, optical systems and tactile probes. The hardened chrome steel construction ensures high wear resistance (greater than HRC 62), which preserves form and diameter during frequent use and reduces drift in long‑term measurements. Using matched spheres minimises systematic error when swapping or comparing reference points.

Surface quality and metrological reliability explained

A very low surface roughness (Ra 0.00001) reduces micro‑asperity effects at the contact interface, improving repeatability when used with ball plates, vee blocks or probe tips. For tactile probing and optical inspection alike, smoother surfaces mean more reliable point detection and smaller measurement scatter. The set configuration of two matched balls enables comparative checks and simple interchangeability in fixtures, shortening set‑up time and increasing throughput in quality control routines. The lightweight nature (approx. 0.05 kg per set) simplifies handling while maintaining stability during contact measurement.

Practical advantages in workshop and laboratory environments

Built as a pair and supplied as a set, these spheres are intended for everyday metrology tasks where accuracy and durability are required without complex handling. The chrome steel material offers corrosion resistance useful in standard workshop atmospheres; the matched pair format supports quick replacement of worn references without extensive requalification. For production inspection, the combination of tight diameter tolerance and hardened material translates directly into fewer rejected measurement runs and reduced rework. The spheres are versatile: suitable for gauge verifications, alignment of spindles and workholding checks.

Contact Metav Werkzeuge for tailored advice on integrating the Metav IndustryLine gauge ball pair M318.422 into existing measurement setups or to request a quotation from our Emmerich team

Technical data

• Article number: M318.422
• GTIN: 4054469184104
• SKU: M318.422
• Set contents: 2 pieces
• Diameter: 12 mm
• Material: hardened chrome steel
• Weight (set): 0.05 kg

Facts

• Accuracy: 0.003 mm
• Diameter tolerance: 0.00008 mm
• Surface roughness (Ra): 0.00001
• Hardness: > HRC 62

Special features

• Matched pair for reference and calibration
• Intended for gauges and precision checking
• Low surface roughness for high repeatability
• Durable, wear‑resistant chrome steel

FAQ

What accuracy can be expected from the gauge ball pair?
The gauge ball pair M318.422 (Metav IndustryLine) is specified with an accuracy of 0.003 mm, providing reliable reference points for inspection tasks.

Are the balls supplied as a matched set?
Yes, the product is delivered as a matched set of two pieces, enabling direct comparative use and simple replacement in fixtures.

What material and hardness are used for these spheres?
The spheres are manufactured from hardened chrome steel with a hardness specification above HRC 62, ensuring long service life under repeated contact.

Can these spheres be used for probe and CMM checks?
The matched pair and fine surface finish make the M318.422 suitable as reference spheres for tactile probes and many optical inspection arrangements.

What tolerances and surface quality are specified?
Diameter tolerance is 0.00008 mm and surface roughness is 0.00001 (Ra), which together support high repeatability in precision measurement workflows.

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