The Bernardo 150 mm 4-jaw chuck is a professional-grade lathe chuck with a diameter of 150 mm and 4 jaws. Krollit has been an official Bernardo distributor since 2007.
- Diameter: 150 mm
- Thread: M33
- Number of jaws: 4
- Area of use: Professional and advanced hobbyist
Who uses the 150 mm 4-jaw chuck and for what
Mechanical workshops and artisan turners use the 150 mm 4-jaw chuck as a clamping accessory on metal lathes, ensuring secure clamping and centering of the workpiece during turning, drilling, and grooving operations.
Its place in the Bernardo range
The Bernardo 150 mm 4-jaw chuck is part of Bernardo's range of lathe chucks, distributed in Italy by Krollit since 2007. The Bernardo range includes models of various categories and performances: to choose the right machine for your use case, you can consult the Bernardo catalog on Krollit or contact customer support for selection assistance.
Krollit logistics and support
Shipping within 3-5 business days from Krollit warehouse for spare parts and accessories. Italian customer support available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the 150 mm 4-jaw chuck for?
The 150 mm 4-jaw chuck is recommended for the following professional profiles:
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Mechanical workshops and artisan turners: Secure clamping of round or hexagonal workpieces on metal lathes during turning, drilling, and grooving operations.
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Users with a Bernardo lathe with a compatible flange: Original replacement or upgrade for Bernardo range lathes (Profi, Hobby, etc.) with A2 DIN 55029 compliant fitting.
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Irregular or non-round shaped workpieces: For workpieces not symmetrically centered, consider independent 4-jaw chucks or universal faceplates.
Frequently Asked Questions
What type of mounting does the 150 mm 4-jaw chuck have?
Check the indicated fitting in the title or specifications (typically A2-5, A2-6, A2-8 according to DIN 55029).
The A2 flange fitting is the standard for Bernardo lathes in the Profi and Hobby ranges. The number (5, 6, 8) indicates the size of the flange, which must match the lathe's headstock.
How many jaws does it have and are they reversible?
Standard self-centering chucks have 3 jaws; typically supplied with 1 set of internal and 1 set of external reversible jaws, plus a tightening key.
3-jaw chucks are suitable for round or hexagonal workpieces. For square or irregular workpieces, consider independent 4-jaw chucks. Soft jaws can be machined on the lathe for special applications.
What is the maximum rotational speed?
See "Max speed" in the technical table: typically 2,500-3,500 rpm for chucks up to Ø 200 mm.
Maximum speed decreases with diameter. Large chucks (Ø 400+ mm) typically have limits of 1,500-2,000 rpm. Exceeding the maximum speed risks the jaws detaching.
What concentricity precision does it offer?
Bernardo professional chucks comply with DIN 8386 class with a typical concentricity of 0.03-0.04 mm.
Concentricity is critical for precision finishes. For high-precision machining (microns), higher-class chucks or dedicated collets are required.
How is it mounted on the lathe?
The chuck is mounted directly on the headstock flange via a camlock fitting for A2 systems.
The Camlock system allows for quick mounting without an additional adapter flange. For lathes with a threaded fitting, a dedicated adapter flange is required. Krollit supplies compatible flanges separately.
