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Magnet technology
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Alustar permanent magnetic chuck for turning and circular grinding

When to choose an Alustar chuck:

The Alustar permanent chuck is used during turning and grinding of ring-shaped workpieces. The chuck excels due to its low weight resulting from the aluminium design of the body. It can cope with a larger weight range of machined components. With this chuck, you have the possibility to machine the front, inner and outer diameter of the workpiece in one operation. The possibility of continuous control of the holding force facilitates centring.


  • Compact top plate made of one piece of steel with radial poles
  • High performance magnetic system with neodymium magnets
  • Unique construction with a self-locking switch mechanism for continuous adjustment of the holding force facilitating workpiece centring
  • Aluminium base reduces the load on the machine tool spindle and increases the available weight capacity of workpieces
  • Very safe, self-locking mechanism preventing the chuck from switching off during machining
  • A recess and threaded holes on the underside of the base for clamping to a suitable flange

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Catalog number Diameter of magnetic chuck Height [mm] Availability (approximate) Price without VAT
(valid for EU flag EU only)
D200 mm 79.00 usually in stock
On request
D250 mm 79.00 usually in stock
On request
D300 mm 82.00 usually in stock
On request
D350 mm 82.00 usually in stock
On request
D400 mm 84.00 usually in stock
On request
D500 mm 109.00 usually in stock
On request
D600 mm 109.00 7 - 8 weeks
On request
D700 mm 120.00 8 - 9 weeks
On request
D800 mm 120.00 8 - 9 weeks
On request

Detailed description:

The Alustar permanent magnetic circular chuck is a lightweight version of the Neostar chuck. The aluminium body reduces its weight significantly thereby allowing clamping of workpieces with larger weights than the basic Neostar version. The great advantage of the chuck is the patented switch mechanism, which makes it possible to adjust the holding force variably and fix the adjusted holding force in any position Thanks to the switching mechanism, you can switch the chuck to 10 to 20 % power to centre the workpiece easily, then switch to 100 % and proceed with safe operation. The long life span of the permanent magnetic chuck is ensured by the solid single piece top plate. Possibility to regrind by up to 5 mm. It is possible to deliver this chuck with a through-hole by request.

Important parameters:

  • Application: Turning, grinding
  • Technology: Permanent
  • Holding force: 140 N/cm2
  • Poles: Radial
  • Regrinding limit: 5 mm
  • Guarantee: 2 years

Additional information:

Beyond the standard design, the customer can choose:
  • Central drilling
  • Precise centre hole (possibly through)
  • Auxiliary top plate
  • Pole plate with T-slots
  • Set of pole extensions

Scope of supply:

  • Magnetic chuck
  • Ratchet wrench
  • Instructions for use


  • Turning and grinding of round and ring-shaped workpieces
výkres Alustar


Model D (mm) H (mm) D1 (mm) E (mm) F (mm) Hmotnost (kg)
ALUS20D200 200 79 20 110 180 11,5
ALUS20D250 250 79 30 166 220 18
ALUS20D300 300 82 38 180 260 27
ALUS20D350 350 84 40 220 300 36
ALUS20D400 400 84 40 260 340 47
ALUS30D500 500 109 50 330 400 98
ALUS30D600 600 109 90 350 450 142