The Bernardo 4-jaw chuck DK12-160/D4 is a professional-grade lathe chuck, with a diameter of 160 mm and a weight of 9 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size: 160/D4
- D - Diameter: 160 mm
- Taper: 4
- D1 (max.): 63.526 mm
- D2: 82.6 mm
- D3: 40 mm
Who uses the DK12-160/D4 4-jaw chuck and for what purpose
Machine shops and artisan turners use the DK12-160/D4 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 4-jaw chuck DK12-160/D4 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 assistance with selection.
Krollit logistics and support
Shipping in 3-5 business 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 DK12-160/D4 4-jaw chuck for?
The dk12-160/d4 4-jaw chuck is recommended for the following professional profiles:
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Machine shops 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 compatible flange Bernardo lathes: original replacement or upgrade for Bernardo lathes (profi, hobby, etc.) with A2 mount 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
| Chuck size |
160/D4 |
| D - Diameter |
160 mm |
| Taper |
4 |
| D1 (max.) |
63.526 mm |
| D2 |
82.6 mm |
| D3 |
40 mm |
| H1 |
74 mm |
| Max. speed |
2500 rpm |
| Approx. weight |
9 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 jaw) clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetric) 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 intensity of use and required tolerance: steel for production and precision, cast iron for general use.
What workpieces is the Ø 160 mm diameter suitable for?
Suitable for small-medium workpieces (max Ø ~140 mm): bench lathes and artisan workshops.
The nominal diameter of the chuck indicates the maximum size of the body, not the workable workpiece. The clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
What does the D4 mounting indicate?
The D4 code (Camlock according to DIN 55029) identifies the size of the lathe spindle nose: D3-D5 for small lathes, D6-D8 for medium, D11-D15 for industrial.
Check the mounting of your lathe before purchasing: the interface flange must correspond exactly to the code. Camlock = quick closing with cams, disassembly in 30 seconds without tools.
How to maintain chuck precision?
Regular cleaning of the spiral 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.
