30mm Precision Measuring Sphere Pair Hardened Stainless Steel 0.003mm Accuracy, 0.00008mm Diameter Tolerance - Metav IndustryLine

This gauge ball pair offers a compact reference standard with 30 mm nominal diameter and 0.003 mm geometric accuracy, delivering reproducible comparative measurements and low uncertainty for routine checks. Order the gauge ball pair directly via Metav Werkzeuge or contact our consultants for application advice.

Gauge ball pair — 30 mm, 0.003 mm accuracy (Metav IndustryLine)

A gauge ball pair serving as a precision reference for dimensional checks and comparative measurements in workshop and inspection environments

• 30 mm nominal diameter precision
• 0.003 mm geometric accuracy
• Hardened surface > HRC 62
• Matched set of two gauge spheres

Engineered for reproducible reference measurements

The gauge ball pair is manufactured to support repeatable comparative checks and reference runs on inspection fixtures and measuring machines. With a nominal diameter of 30 mm and a stated accuracy of 0.003 mm, the spheres provide a compact reference geometry that reduces the need for larger artefacts in daily verification tasks. The matched pair format ensures both spheres share the same manufacturing datum, so comparative measurements between mating components or indenter systems remain consistent and traceable.

Tighter tolerances that reduce measurement uncertainty

A tight diameter tolerance of 0.00008 mm and excellent surface quality (Ra 0.00001) lower geometric noise during contact probes and optical inspection. As a consequence, probe calibration and repeatability tests show less scatter, which supports faster decision-making in quality control. Where a machinist or technician requires stable reference points for roundness checks, alignment gauges or fixture set-ups, the ball pair’s defined specifications help convert instrument performance into reliable inspection outcomes.

Hardness and surface integrity for enduring performance

The spheres are delivered with a high hardness rating (> HRC 62), combining wear resistance with dimensional stability under light contact loads. That hardness, together with the fine surface finish, minimises micro-deformation from repeated probing and reduces the risk of fretting when used in kinematic seats or v-blocks. The result is a reference artefact that retains its geometry over prolonged service life, lowering the frequency of replacement and contributing to lower total cost of ownership for calibration equipment.

Practical applications and handling in the workshop

Supplied as a matched pair, these gauge spheres suit a range of metrology tasks: reference points for comparator checks, datum spheres for fixture alignment, and master artefacts for probe verification on coordinate measuring machines. The compact size supports easy storage and integration into existing inspection routines. The set of two allows one sphere to remain as a stable master while the other is used in operational checks, enabling uninterrupted quality workflows and straightforward swap-back comparisons.

For application guidance or to request supply of the Metav IndustryLine gauge ball pair (SKU M318.456), contact Metav Werkzeuge in Emmerich by e‑mail at info@metav-werkzeuge.com or by phone on +49 2822 7131930 for fast technical advice and dispatch.

Technical data

• Article number: M318.456

• SKU: M318.456

• Description: gauge ball pair made of stainless steel

• Category: gauges

• Diameter: 30 mm

• Geometric accuracy: 0.003 mm

• Diameter tolerance: 0.00008 mm

• Surface roughness: 0.00001

• Hardness: > HRC 62

• Weight: 1.3 kg

• Set contents: 2 pieces

• Matched pair for reference measurements

• Suitable for comparator and probe checks

• Compact reference geometry for fixtures

• Delivery form: set

FAQ

What is the declared geometric accuracy of the gauge spheres?
The declared geometric accuracy is 0.003 mm for the gauge ball pair (Metav IndustryLine, SKU M318.456), giving a reliable baseline for comparative inspections.

Are the spheres supplied as a matched set and how many pieces are included?
Yes, the product is supplied as a matched set comprising 2 pieces; the matched pair arrangement supports master/working comparisons in routine checks.

What hardness and surface quality can be expected?
The spheres are delivered with a hardness greater than HRC 62 and a very fine surface roughness of 0.00001, providing wear resistance and stable contact characteristics.

For which applications are these gauge balls most suitable?
Typical uses include probe verification on CMMs, datum sphere references in fixture set-ups and comparative measurements in workshop inspection processes using the gauge ball pair M318.456.

How does the tight diameter tolerance benefit everyday metrology?
A diameter tolerance of 0.00008 mm reduces geometric variation between spheres, which lowers measurement scatter during comparative runs and supports faster, more confident quality decisions.

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