The Bernardo 4-jaw chuck PS4-100 is a professional-grade lathe chuck, weighing 2.8 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size A: 100
- B: 50 mm
- C: 3 mm
- d: 70 mm
- E: 20 mm
- F: 83 mm
Who uses the PS4-100 4-Jaw Chuck and for what purpose
Mechanical workshops and artisan turners use the PS4-100 4-jaw chuck as a clamping accessory on metal lathes, ensuring secure clamping and workpiece centering during turning, drilling, and grooving operations.
Its place in the Bernardo range
The Bernardo PS4-100 4-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 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 working days from Krollit warehouse for spare parts and accessories. Customer support in Italian is available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the PS4-100 4-Jaw Chuck for
The PS4-100 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 for turning, drilling, and grooving operations.
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Users with compatible Bernardo flange lathes: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 DIN 55029 compliant mounting.
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Irregular or non-round workpieces: for asymmetrically centered workpieces, consider independent 4-jaw chucks or universal platforms.
Technical Specifications
| B |
50 mm |
| C |
3 mm |
| d |
70 mm |
| E |
20 mm |
| F |
83 mm |
| G |
M8 |
| h |
42 mm |
| J |
17 mm |
| Chuck size A |
100 |
| Max. speed |
3500 rpm |
| Weight approx. |
2.8 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 independent jaw) chuck clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetrical) clamping, independent jaw chucks are required.
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 usage intensity and 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. Clamping capacity depends on jaw opening (typically 60-70% of nominal Ø).
How do I check compatibility with my lathe?
Check the mounting type of the lathe spindle nose (Camlock D3-D15, or threaded M-mount) 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 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.
