Bernardo Mandrino M 70 is a professional lathe chuck with Type A dovetail jaws. Krollit, official Bernardo distributor since 2007.
- Size: M70
- Jaw type: Type A Dovetail
- Intended use: Professional and advanced hobbyist
Who uses the M 70 Chuck and for what
Mechanical workshops and artisan turners use the M 70 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 M 70 Chuck is part of the Bernardo lathe chuck range, 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 assistance with selection.
Krollit logistics and support
Shipping 3-5 business days from Krollit warehouse for spare parts and accessories. Italian-speaking customer support available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the M 70 Chuck for
The M 70 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 for turning, drilling, and grooving operations.
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Users with a compatible flange Bernardo lathe: original replacement or upgrade for Bernardo range lathes (Profi, Hobby, etc.) with an A2 connection conforming to DIN 55029.
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Irregular or non-round workpieces: for non-symmetrically centered workpieces, consider 4-jaw independent chucks or universal faceplates.
Frequently Asked Questions
What type of mounting does the M 70 Chuck have?
Check the indicated connection in the title or specifications (typically A2-5, A2-6, A2-8 according to DIN 55029).
The A2 flange connection is the standard for Bernardo Profi and Hobby range lathes. The number (5, 6, 8) indicates the flange size, 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 4-jaw independent chucks. Soft jaws can be machined on the lathe for special applications.
What is the maximum rotation 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?
Professional Bernardo chucks comply with DIN 8386 class with typical concentricity of 0.03-0.04 mm.
Concentricity is critical for precision finishes. For high-precision machining (microns), higher-class chucks or dedicated clamping collets are required.
How is it mounted on the lathe?
The chuck is mounted directly on the headstock flange via a camlock connection for A2 systems.
The Camlock system allows quick mounting without an additional adapter flange. For lathes with a threaded connection, a dedicated adapter flange is required. Krollit supplies compatible flanges separately.
