The Bernardo 4-jaw chuck PS4-200 is a lathe chuck for professional use, weighing 17.5 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size A: 200
- B: 75 mm
- C: 4 mm
- d: 160 mm
- E: 55 mm
- F: 176 mm
Who uses the 4-jaw chuck PS4-200 and for what
Mechanical workshops and artisan turners use the 4-jaw chuck PS4-200 as a clamping accessory on the metal lathe, 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 PS4-200 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 selection assistance.
Krollit logistics and support
Shipping within 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 4-jaw chuck PS4-200 for
The 4-jaw chuck PS4-200 is recommended for the following professional profiles:
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Mechanical workshops and artisan turners: secure clamping of round or hexagonal workpieces on a metal lathe during turning, drilling, and grooving operations.
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Users with compatible flange Bernardo lathe: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 attachment conforming to 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
| B |
75 mm |
| C |
4 mm |
| d |
160 mm |
| E |
55 mm |
| F |
176 mm |
| G |
M10 |
| h |
85 mm |
| J |
29 mm |
| Chuck size A |
200 |
| Max. speed |
2500 rpm |
| Weight approx. |
17.5 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 (not with independent jaws) clamps square or octagonal workpieces symmetrically. For 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 200 mm diameter suitable for?
Suitable for medium workpieces (max Ø ~220 mm): professional lathes.
The nominal diameter of the chuck indicates the maximum size of the body, not that of the 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 nose fitting (Camlock D3-D15, or threaded attachment M-) and the corresponding diameter.
On modern lathes, Camlock fitting is the most common. On older lathes, there may be a threaded (M-) or flanged attachment. The lathe's technical documentation indicates the exact type.
How is chuck precision maintained?
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.
