Block Neodymium Magnets(ND-Fe-B) are composed of neodymium, iron, boron and a few transition metals. These magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

Size of Block Neodymium Magnets:
Disc: Max: Diameter 202mm*45mm thickness---Min: Diameter 1.5mm*0.5mm thickness
Ring: Max: Od202mm*ID182mm*thickness 45mm---Min: OD 3mm*ID1mm*3mm thickness
Block: Max: L200mm*W200mm*T45mm---Min: L0.5mm*W0.5mm*T0.5mm.
Sizes can according to customers' requirements.

Grade of Block Neodymium Magnets:
N35. N38. N40. N42. N45. N48. N50. N52 (Max Working Temperature: 80° C)
N35M, N38M. N40M. N42M. N45M. N48M. (Max Working Temperature: 100° C)
N35H, N38H. N40H. N42H. N45H. N48H (Max Working Temperature: 120° C)
N33SH, N35SH, N38SH. N4S0H. N42SH. N45SH (Max Working Temperature: 150° C)
N28UH, N30UH, N33UH. N35UH. N38UH. N40U (Max Working Temperature: 180° C)
N28EH, N30EH, N33EH. N35EH. N38EH (Max Working Temperature: 200° C)
N28AH, N30AH, N33AH. N35AH (Max Working Temperature: 230° C)