China Neodymium And Ferrite Magnets Manufacturer & Supplier 
KTH7812 is a 16-bit Hall magnetic encoder that supports conventional radial disks, circular rings, and multi-pole magnetic rings. Today, our editor will provide a size recommendation for the magnet used in it.
If you intend to use the product for angle detection or position feedback, we recommend shaft-end (on-shaft) mounting, using a circular magnet made of N35–N52 material (<80°C), with the entire diameter magnetised. Available dimensions are 8 × 2.5 mm, 10 × 2.5 mm and 12 × 3 mm, with a maximum mounting tolerance of 0.3 mm.
For off-axis mounting, you can use a circular magnet with a diameter of 10 mm or a ring magnet with an outer diameter of 10 mm; a thickness of around 2.5 mm should suffice.
For motor speed measurement and high-precision position detection, a multi-pole magnetic ring (eccentric shaft installation) is recommended, which can achieve high-resolution detection. The specification requires that the magnetic pole width be greater than 2mm, with no restrictions on the diameter of the magnetic ring. The chip operates in a magnetic field of 30-150mt. For the optimal placement location, contact the original factory FAE for magnetic field simulation. Materials such as injection-molded ferrite and injection-molded neodymium iron boron can be selected.
KTH7812 Hall-effect encoder multi-pole magnet mounting
Our recommended sizes are 9.5x2x2mm, 9.5x1x2mm, 16x11x2mm, 14.5x3.175x2mm, 9.5x3.175x3mm, 16x3.1x2.5mm, 8.5x2.5x3mm, 18x2.25x2.5mm, 18x2.3x2.6mm, 14.8x8.5x2.8mm.
As a professional motor magnet supplier, our company can provide various diameter magnetized disc magnets, axial or radial multipolar magnetic rings, and reliable magnetic circuit solutions for Hall encoders, magnetic encoders, and brushless motors.
Related products;
Single-sided 6-pole plastic ferrite magnet ring 9.5x2x2mm
Hall component radial small neodymium disc magnet 8mm x 2.5mm