Ø50x300 Runout Test Mandrel BT50 Three-Point Runout ≤0.003mm, Hardened Gauge Steel JIS 6339/DIN ISO 7388-2 - Metav IndustryLine

Take advantage of the combination of high runout accuracy, robust hardened gauge steel construction and clear standard conformity for reliable spindle setup and repeatable measurements; order the test mandrel directly via Metav Werkzeuge or consult our specialists for application advice.

Test mandrel BT50-300 — runout accuracy <0.003 mm (Metav IndustryLine)

Test mandrel BT50-300 is a precision inspection mandrel designed for runout testing and alignment of BT50 spindles in machine tools.

• High runout accuracy <0.003 mm
• Hardened gauge steel construction
• Conforms to JIS 6339 and DIN ISO 7388-2
• BT50 taper, Ø50 x 300 mm

Precise spindle alignment that reduces setup time

The mandrel delivers runout accuracy better than 0.003 mm, enabling fast detection of spindle eccentricity and concentricity issues. By using a dedicated test mandrel with a defined BT50 taper and a Ø50 x 300 mm working length, technicians obtain a stable reference that simplifies adjustment procedures and reduces iterative reworking. The direct consequence is fewer scrapped parts and shorter machine downtime, as misalignment is identified and corrected at first fitting rather than after trial cuts.

Robust construction for repeatable reference measurements

Manufactured from hardened gauge steel and finished to a hardness of HRC 58, the checking mandrel offers the stiffness and wear resistance required for repeated use in workshop environments. The substantial mass (5 kg) and optimised geometry keep the component stable within the spindle, which improves measurement repeatability and lowers measurement uncertainty during inspection runs. The solid construction also minimises the influence of handling on the measurement, preserving the calibrated condition of the gauge across many cycles.

Standards-based design and practical workshop integration

Designed in accordance with JIS 6339 and DIN ISO 7388-2, the mandrel aligns with recognised industry requirements for taper gauges and runout assessment, ensuring interchangeability and reproducible test procedures. The tool is intended for runout testing and spindle alignment tasks on machines equipped with a BT50 taper. As a dedicated inspection accessory, it integrates smoothly into standard workshop routines and supports quality assurance processes by providing a stable, standardised datum for precision testing.

Contact Metav Werkzeuge for tailored technical guidance on spindle alignment and to obtain the BT50-300 test mandrel from our Emmerich quality centre.

Technical data

• Article number: M318.945
• Type: BT50-300
• Dimension: Ø50 x 300 mm
• Material: Hardened gauge steel
• Weight: 5 kg
• Hardness: HRC 58
• Runout accuracy: <0.003 mm
• Norm: JIS 6339 / DIN ISO 7388-2
• Suitable for: Runout testing and spindle alignment with BT taper

Figures

• Diameter: 50 mm
• Length: 300 mm
• Weight: 5 kg
• Runout: <0.003 mm
• Hardness: HRC 58

Special features

• BT50 taper
• Hardened gauge steel construction
• Conforms to JIS 6339 and DIN ISO 7388-2
• Intended for runout testing and spindle alignment

FAQ

What runout tolerance can be expected with this mandrel?
The Test mandrel BT50-300 (SKU M318.945) provides a runout accuracy better than 0.003 mm, suitable for fine alignment and inspection tasks.

Which spindles is the mandrel compatible with?
It is designed for machines with a BT50 taper and is intended specifically for runout testing and aligning BT50 spindles.

What material and hardness does the mandrel have?
The inspection mandrel is made from hardened gauge steel and is finished to approximately HRC 58 for long-term stability.

How heavy is the mandrel and how does that affect handling?
The mandrel weighs about 5 kg; the mass contributes to a stable reference in the spindle but requires appropriate handling procedures during fitting and removal.

Which standards does the mandrel conform to?
The test mandrel follows the requirements of JIS 6339 and DIN ISO 7388-2 for taper gauges and runout testing.

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