Bernardo 4-jaw chuck PS4-315 is a professional lathe chuck, weighing 50 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size A: 315
- B: 94 mm
- C: 5 mm
- d: 260 mm
- E: 103 mm
- F: 286 mm
Who uses the PS4-315 4-jaw chuck and for what purpose
Machine shops and artisan turners use the PS4-315 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 PS4-315 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 performances: 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 3-5 business days from Krollit warehouse for spare parts and accessories. Customer assistance in Italian available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.
Who is the PS4-315 4-jaw chuck for?
The PS4-315 4-jaw chuck is recommended for the following professional profiles:
-
Machine shops and artisan turners: secure clamping of round or hexagonal workpieces on metal lathes for turning, drilling, and grooving operations.
-
Users with a compatible flange Bernardo lathe: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 mount conforming to DIN 55029.
-
Irregular or non-round workpieces: for non-symmetrically centered workpieces, consider independent 4-jaw chucks or universal faceplates.
Technical specifications
| B |
94 mm |
| C |
5 mm |
| d |
260 mm |
| E |
103 mm |
| F |
286 mm |
| G |
M16 |
| h |
125 mm |
| J |
43 mm |
| Chuck size A |
315 |
| Max. speed |
1500 rpm |
| Weight approx. |
50 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 jaws) clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetrical) 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 315 mm diameter suitable for?
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 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 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.
