N40 neodymium magnets are hard, brittle and easily corrode. It's moderate temperature stability and can be working stability under 80C for low Hci Neodymium magnets.
N40 neodymium magnets'(BH)max reaches up to 51MGOe . The intrinsic coercive force is over 30,000 Oe.

Model Number: YSNEO-43
Instrument magnet
Material: Nd2Fe14B + other rare earth material
Grade: N35 to N52
Coating: Nickel, Zinc
Applications: instrument and apparatus

N45 neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to jump at an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly..

Model Number: YSNEO-42
Motor magnet
Material: Nd2Fe14B + other rare earth material
Grade: up to N52 Max
Coating: Nickel, Zinc
Applications: Motor generator, Electric Motor, Micro special motors,