Bernardo 3-jaw cast iron chuck PS3-400/D8 is a professional lathe chuck, with a diameter of 400 mm and a weight of 101 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size: 400/D8
- Diameter: 400 mm
- Taper: 8
- B: 128.5 mm
- D (max.): 139.734 mm
- E: 136 mm
Who uses the PS3-400/D8 3-jaw cast iron chuck and for what
Mechanical workshops and artisan turners use the PS3-400/D8 3-jaw cast iron 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
Bernardo 3-jaw cast iron chuck PS3-400/D8 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 3-5 working days from Krollit warehouse for spare parts and accessories. Italian customer support available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the PS3-400/D8 3-jaw cast iron chuck for
The PS3-400/D8 3-jaw cast iron 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 a metal lathe 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 attachment compliant with DIN 55029.
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Irregular or non-round workpieces: for non-symmetrically centered workpieces, consider 4-jaw independent chucks or universal faceplates.
Technical Specifications
| Diameter |
400 mm |
| Taper |
8 |
| B |
128.5 mm |
| D (max.) |
139.734 mm |
| E |
136 mm |
| F1 |
171.4 mm |
| Camlock bolts |
6 |
| Chuck size |
400/D8 |
| Max. speed |
1000 rpm |
| Weight approx. |
101 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 lathe chuck: 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 thermal dissipation and robust construction at a lower cost compared to steel.
Cast iron: typical concentricity precision 0.03-0.1 mm. The DK Camlock series has a quick attachment, the PS is the basic model. High service life in standard machining operations.
What workpieces is the Ø 400 mm diameter suitable for?
Suitable for medium to large workpieces (max Ø ~360 mm): industrial 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).
What does the D8 mounting indicate?
The D8 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 exactly match the code. Camlock = quick clamping with cams, disassembly in 30 seconds without tools.
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.
