The Bernardo 4-jaw chuck DK12-630 is a professional-grade lathe chuck, weighing 240 kg. Krollit has been an official Bernardo distributor since 2007.
- D - Chuck size: 630
- D1: 545 mm
- D2: 586 mm
- D3: 260 mm
- h: 220.5 mm
- H1: 135 mm
Who uses the DK12-630 4-jaw chuck and what for?
Mechanical workshops and artisan turners use the DK12-630 4-jaw chuck as a clamping accessory on metal lathes, ensuring secure gripping and centering of the workpiece during turning, drilling, and grooving operations.
Its place in the Bernardo range
The Bernardo 4-jaw chuck DK12-630 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 performance levels: 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 3-5 working days from Krollit warehouse for spare parts and accessories. Customer support in Italian is available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the DK12-630 4-jaw chuck for?
The DK12-630 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 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 A2 spindle nose conforming to DIN 55029.
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Irregular or non-round shaped workpieces: For non-symmetrically centered workpieces, consider independent 4-jaw chucks or universal platforms.
Technical specifications
| D1 |
545 mm |
| D2 |
586 mm |
| D3 |
260 mm |
| h |
220.5 mm |
| H1 |
135 mm |
| h |
7 mm |
| Mounting screws |
6 x M16 |
| D - Chuck size |
630 |
| Max. speed |
800 rpm |
| Weight approx. |
240 kg |
Frequently asked questions
When to use a 4-jaw chuck?
Self-centering 4-jaw chucks are for square and 4-8 sided workpieces. The jaws move together with a single key.
The self-centering 4-jaw chuck (not independent jaws) clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetric) clamping, independent 4-jaw chucks are needed.
What material is the chuck body made of?
The material is indicated in the title: steel (PO series) for maximum precision, cast iron (DK/PS series) for standard use.
The choice depends on the intensity of use and the required tolerance: steel for production and precision, cast iron for general use.
What workpieces is the Ø 630 mm diameter suitable for?
Suitable for large workpieces (max Ø ~600 mm): heavy industrial lathes.
The nominal chuck diameter indicates the maximum size of the body, not the maximum workable workpiece. The clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
How do I check compatibility with my lathe?
Check the type of lathe spindle nose mounting (Camlock D3-D15, or threaded M- mounting) and the corresponding diameter.
Camlock mounting is the most common on modern lathes. Older lathes may have threaded (M-) or flanged mounting. The lathe's technical documentation indicates the exact type.
How is chuck accuracy maintained?
Regular cleaning of the scroll mechanism, periodic lubrication with specific chuck grease, concentricity check every 6 months with a dial indicator.
A jaw that moves with difficulty indicates chips or rust in the mechanism: disassemble, clean, and grease. Concentricity is checked by mounting a ground bar and measuring with a dial indicator: acceptable tolerance 0.03-0.1 mm depending on the model.
