Neodymium Precision

NdFeB Precision Magnets

The standard dimensional tolerance for the majority of permanent magnets is +/-0.1mm with +/-0.05mm offered as a best achievable tolerance for an extra charge.

The Precision NdFeB Magnets range offers tolerances down to as low as +/-0.005mm. These Precision NdFeB Magnets are offered subject to a 100,000 magnets minimum order quantity (MOQ). Samples can be arranged but may also be subject to a MOQ. As these magnets are bespoke, we will require information on the exact requirements including desired tolerances. If the shape can be produced we will contact you with a price, lead time and confirmation on tolerances that can be achieved (if the required tolerances are too tight, we will advise on the nearest realistic tolerances that can be achieved). For note, coatings are usually limited to Ni-Cu-Ni, Ni, Parylene C, Zinc and Gold.

Some example size ranges are given below:-

• NdFeB rectangular block:- 1.0mm x 1.0mm x 1.0mmA through to 22.0mm x 2.75mm x 1.05mmA
• NdFeB ring:- OD 0.9mm x ID 0.25mm x 0.5mm through to OD 4.5mm x ID 1.2mm x 3.65mm
• NdFeB disc:- D 1.0mm x 0.5mm through to D 6mm x 0.7mm

Case Study:-
We were asked to supply axially magnetised N35 disc magnets that were rated to 120 deg C, having a diameter of 3mm but with a 0.15mm thickness. Even with +/-0.05mm tolerances, the potential variation in thickness could be problematic for magnetic output variation (the thickness would vary from 0.1mm to 0.2mm). We offered +/-0.02mm tolerances on a Ni plated N35H magnet. The tests results on a randomly selected sample of 20 of our Precision Magnets were as follows:-

Example of Test Results

An example of the test results is below:-

As is shown in the table, our Precision Magnets are supplied to excellent tolerances (even with a Nickel plating on the magnets).

If you would like Precision Magnets, please contact us with your requirements and we will provide you with a quotation.