The Bernardo 4-jaw chuck DK12-100 is a professional-grade lathe chuck, weighing 3.2 kg. Krollit, official Bernardo distributor since 2007.
- D - Chuck size: 100
- D1: 70 mm
- D2: 83 mm
- D3: 22 mm
- h: 74.5 mm
- H1: 55 mm
Who uses the DK12-100 4-jaw chuck and for what purpose?
Mechanical workshops and artisan turners use the DK12-100 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 DK12-100 4-jaw 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 within 3-5 working days from Krollit warehouse for spare parts and accessories. Customer support in Italian available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the DK12-100 4-jaw chuck for?
The dk12-100 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.
-
Users with a compatible flange Bernardo lathe: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 mount compliant with DIN 55029.
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Irregular or non-round workpieces: for non-symmetrically centered workpieces, consider independent 4-jaw chucks or universal faceplates.
Technical specifications
| D1 |
70 mm |
| D2 |
83 mm |
| D3 |
22 mm |
| h |
74.5 mm |
| H1 |
55 mm |
| h |
3 mm |
| Mounting screws |
3 x M8 |
| D - Chuck size |
100 |
| Max. speed |
3500 rpm |
| Weight approx. |
3.2 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 with independent jaws) clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetrical) clamping, independent 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 100 mm diameter suitable for?
Suitable for small workpieces (max Ø ~80 mm): hobby and precision lathes.
The nominal diameter of the chuck indicates the maximum body size, not the machinable workpiece size. 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-mount) and the corresponding diameter.
On modern lathes, Camlock mounting is the most common. Older lathes may have threaded (M-) or flanged mounts. The technical documentation of the lathe indicates the exact type.
How is chuck precision maintained?
Regular cleaning of the scroll mechanism, periodic lubrication with specific chuck grease, and 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.
