Bernardo 3-jaw steel chuck PO3-160/D5 is a lathe chuck for professional use, with a diameter of 160 mm and a weight of 9 kg. Krollit, official Bernardo distributor since 2007.
- Chuck size: 160/D5
- Diameter: 160 mm
- Taper: 5
- B: 68 mm
- D (max.): 82,578 mm
- E: 42 mm
Who uses the PO3-160/D5 3-jaw steel chuck and for what
Machine shops and artisan turners use the PO3-160/D5 3-jaw steel 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 PO3-160/D5 3-jaw steel chuck 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 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 PO3-160/D5 3-jaw steel chuck for
The po3-160/d5 3-jaw steel chuck is recommended for the following professional profiles:
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Machine shops 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 compatible flange: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 spindle nose according to 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 |
160 mm |
| Taper |
5 |
| B |
68 mm |
| D (max.) |
82,578 mm |
| E |
42 mm |
| F1 |
104,8 mm |
| Cam-lock bolts |
6 |
| Chuck size |
160/D5 |
| Max. speed |
4500 rpm |
| Approx. weight |
9 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 accuracy 0.03-0.1 mm depending on the body material (steel = better accuracy, cast iron = standard).
Why a steel chuck instead of cast iron?
Steel chucks (PO series) offer superior concentricity accuracy (0.01-0.03 mm) and greater wear resistance in intensive machining operations.
Ground steel: heavier, but with smaller dimensions for the same nominal diameter. Suitable for series production and precision turning of heat-treated steels or hard alloys.
What workpieces is the Ø 160 mm diameter suitable for?
Suitable for small-medium workpieces (max Ø ~140 mm): bench lathes and artisan workshops.
The nominal diameter of the chuck indicates the maximum size of the body, not the workable workpiece. The clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).
What does the D5 taper indicate?
The D5 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 taper of your lathe before purchasing: the interface flange must exactly match the code. Camlock = quick closing with cams, disassembly in 30 seconds without tools.
How to maintain chuck accuracy?
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.
