Bernardo PS3-400 Cast Iron 3-Jaw Chuck is a professional lathe chuck, weighing 85 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size A: 400
- B: 105 mm
- C: 5 mm
- d: 330 mm
- E: 136 mm
- F: 362 mm
Who uses the PS3-400 Cast Iron 3-Jaw Chuck and what for
Mechanical workshops and artisan turners use the PS3-400 Cast Iron 3-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 PS3-400 Cast Iron 3-Jaw Chuck 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 machine suitable 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 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 PS3-400 Cast Iron 3-Jaw Chuck for
The PS3-400 cast iron 3-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.
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Users with a Bernardo lathe with a compatible flange: 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 asymmetrically uncentered workpieces, consider 4-jaw independent chucks or universal platforms.
Technical specifications
| B |
105 mm |
| C |
5 mm |
| d |
330 mm |
| E |
136 mm |
| F |
362 mm |
| G |
M16 |
| h |
145 mm |
| J |
55 mm |
| Chuck size A |
400 |
| Max. speed |
1000 rpm |
| Approx. weight |
85 kg |
Frequently asked questions
When to use a 3-jaw chuck?
Self-centering 3-jaw chucks are for cylindrical, hexagonal, and 3-6-9-12 sided workpieces. The jaws move together with a single key (self-centering).
It is the most common chuck on lathes: quick clamping of symmetrical workpieces, typical concentricity precision 0.03-0.1 mm depending on the body material (steel = better precision, cast iron = standard).
Why a cast iron chuck?
Cast iron chucks (DK Camlock or PS series) offer excellent heat dissipation and robust structure at a lower cost compared to steel.
Cast iron: typical concentricity precision 0.03-0.1 mm. The DK Camlock series has a quick-change mount, the PS is the basic model. High service life in standard machining operations.
Which workpieces are suitable for a Ø 400 mm diameter?
Suitable for medium-large workpieces (max Ø ~360 mm): industrial lathes.
The nominal diameter of the chuck indicates the maximum body size, not the machinable workpiece size. Clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
How do I check compatibility with my lathe?
Check the mounting type of the lathe spindle nose (Camlock D3-D15, or threaded mount M-) and the corresponding diameter.
On modern lathes, Camlock mounting is the most common. On older lathes, there may be a threaded (M-) or flanged mount. 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.
