High Performance Sintered Permanent Neodymium Countersunk Magnet

Ndfeb Magnet are composed of Neodymium, Iron and Boron. Density of Neodymium magnets is. 27Lb/in3 (7.5g/cm3).

Ndfeb Magnet are manufactured in a metallurgy process through alloying, crushing, powdering, pressing w/magnetic orientation, sintering, then cutting, coating, inspecting and packing before shipment.

Ndfeb Magnet offer the highest (BH)max and high Hci(BH)max, the Maximum Energy Product, of Neodymium magnets is highest of any kind of permanent magnets today in the world. (BH)max at different grades of Neodymium magnets is 27 to 52 MGOe. Neodymium magnets have extremely resistance to demagnetization with Hci, Intrisic coercive force, over 12, 000 Oe. Because of very high (BH)max and Hci, Neo magnets could be used as a reversible medium for large amount of energy transformation in miniaturized application where a strong magnetic demagnetization field exists, such as computer hard drive. Disk and rectangle shapes for customers' immediate needs and accept special orders for custom Neodymium magnets.

Ndfeb Magnet are most powerful of any kind of magnetic materialsBr of Neodymium magnets are much more than 11, 000 Gauss. Therefore, Neodymium magnets have strong holding strength on metal surface and could be used as component for holding, separating, etc. Neodymium magnets must be carefully handled to avoid personal injury and material damage due to its extremely magnetic strength and brittle property.

Ndfeb Magnet are sensitive to temperature change and even lose magnet properties at high temperatureNeodymium magnets lose -0.09 ~ -0.13% of Br/° C and can work stably under 80° C for low Hci Neodymium magnets and 150° C for high Hci Neodymium magnets.
Neodymium magnets are corrupted in humid environment Surface protection is strongly recommended, such as plating, varnishing and encapsulating.

Ndfeb Magnet are hard and brittle Neodymium magnets can be abrasively machined with coolant served to absorb heating and dust. Without coolant, rare earth magnets could crack and chip by the heat produced during high speed cutting or grinding, and the sparks contain the easily oxidized grinding dust that could cause fire!

Magnetic Property of NdFeB Magnet

Grade Remanence  Br Coercive Force  Hcb Intrinsic Coercive force  Hci Max Energy Product  (BH) max Max Working Temp. KG T KOe KA/m KOe KA/m MGOe KJ/m ºC °F N35 11.4-11.8 1.18-1.28 ≥ 10.8 ≥ 836 ≥ 12 ≥ 955 33-36 263-287 80 176 N38 11.8-12.3 1.18-1.28 ≥ 10.8 ≥ 860 ≥ 12 ≥ 955 36-39 287-310 80 176 N40 12.7-12.9 1.27-1.29 ≥ 11.0 ≥ 876 ≥ 12 ≥ 955 38-41 303-326 80 176 N42 12.9-13.3 1.29-1.33 ≥ 10.5 ≥ 836 ≥ 12 ≥ 955 40-43 318-342 80 176 N45 13.3-13.8 1.33-1.38 ≥ 9.5 ≥ 756 ≥ 12 ≥ 955 43-46 342-366 80 176 N48 13.8-14.2 1.38-1.42 ≥ 10.5 ≥ 835 ≥ 12 ≥ 955 46-49 366-390 80 176 N50 13.8-14.5 1.38-1.45 ≥ 10.5 ≥ 835 ≥ 11 ≥ 955 47-51 374-406 80 176 N52 14.3-14.8 1.43-1.48 ≥ 10.8 ≥ 860 ≥ 11 ≥ 876 50-53 398-422 80 176 33M 11.4-11.8 1.14-1.18 ≥ 10.3 ≥ 820 ≥ 14 ≥ 1114 31-33 247-263 100 212 35M 11.8-12.3 1.18-1.23 ≥ 10.8 ≥ 860 ≥ 14 ≥ 1114 33-36 263-287 100 212 38M 12.3-12.7 1.23-1.27 ≥ 11.0 ≥ 876 ≥ 14 ≥ 1114 38-41 303-326 100 212 40M 12.7-12.9 1.27-1.29 ≥ 11.4 ≥ 907 ≥ 14 ≥ 1114 38-41 303-326 100 212 42M 12.8-13.2 1.28-1.32 ≥ 11.6 ≥ 923 ≥ 14 ≥1114 40-43 318-342 100 212 45M 13.2-13.8 1.32-1.38 ≥ 11.8 ≥ 939 ≥ 14 ≥ 1114 43-46 342-366 100 212 48M 13.6-14.0 1.36-1.40 ≥ 11.8 ≥ 939 ≥ 14 ≥ 1114 46-49 366-390 100 212 50M 14.0-14.5 1.40-1.45 ≥ 13.0 ≥ 1033 ≥ 14 ≥ 1114 48-51 382-406 100 212 30H 10.8-11.4 1.08-1.14 ≥ 10.2 ≥ 812 ≥ 17 ≥ 1353 28-31 223-247 120 248 33H 11.4-11.8 1.14-1.18 ≥ 10.6 ≥ 844 ≥ 17 ≥ 1353 31-33 247-263 120 248 35H 11.8-12.3 1.18-1.28 ≥ 11.0 ≥ 876 ≥ 17 ≥ 1353 33-36 263-287 120 248 38H 12.3-12.7 1.23-1.27 ≥ 11.2 ≥ 890 ≥ 17 ≥ 1353 36-39 287-310 120 248 40H 12.7-12.9 1.27-1.29 ≥ 11.5 ≥ 915 ≥ 17 ≥ 1353 38-41 303-326 120 248 42H 12.8-13.2 1.28-1.32 ≥ 12.0 ≥ 955 ≥ 17 ≥ 1353 40-43 318-342 120 248 45H 13.2-13.5 1.32-1.38 ≥ 12.0 ≥ 955 ≥ 17 ≥ 1353 42-46 335-366 120 248 46H 13.3-13.8 1.33-1.38 ≥ 12.2 ≥ 972 ≥ 16 ≥ 1274 44-47 350-374 120 248 48H 13.6-14.3 1.36-1.43 ≥ 12.5 ≥ 995 ≥ 16 ≥ 1274 46-49 366-390 120 248 30SH 10.8-11.4 1.081.14 ≥ 10.0 ≥ 796 ≥ 20 ≥ 1672 28-31 223-247 150 302 33SH 11.4-11.8 1.14-1.18 ≥ 10.5 ≥ 836 ≥ 20 ≥ 1672 31-34 247-276 150 302 35SH 11.8-12.3 1.18-1.23 ≥ 11.0 ≥ 876 ≥ 20 ≥ 1672 33-36 263-287 150 302 38SH 12.3-12.7 1.23-1.27 ≥ 11.4 ≥ 907 ≥ 20 ≥ 1972 36-39 287-310 150 302 40SH 12.5-12.8 1.25-1.28 ≥ 11.8 ≥ 939 ≥ 20 ≥ 1972 38-41 302-326 150 302 42SH 12.8-13.2 1.28-1.32 ≥ 11.8 ≥ 939 ≥ 20 ≥ 1672 40-43 320-343 150 302 45SH 13.2-13.8 1.32-1.38 ≥ 12.6 ≥ 1003 ≥ 20 ≥ 1592 43-46 342-366 150 302 30UH 10.8-11.4 1.08-1.14 ≥ 10.2 ≥ 812 ≥ 25 ≥ 1990 28-31 223-247 180 356 33UH 11.3-11.7 1.13-1.17 ≥ 10.7 ≥ 852 ≥ 25 ≥ 1990 31-33 247-263 180 356 35UH 11.7-12.1 1.17-1.21 ≥ 10.7 ≥ 852 ≥ 25 ≥ 1990 33-36 263-287 180 356 38UH 12.1-12.5 1.21-1.25 ≥ 11.4 ≥ 907 ≥ 25 ≥ 1990 36-39 287-310 180 356 40UH 12.5-12.8 1.25-1.28 ≥ 11.4 ≥ 907 ≥ 25 ≥ 1990 38-41 302-326 180 356 28EH 10.5-10.8 1.05-1.08 ≥ 9.5 ≥ 756 ≥ 30 ≥ 2388 26-29 207-231 200 392 30EH 10.8-11.4 1.08-1.14 ≥ 9.5 ≥ 756 ≥ 30 ≥ 2388 28-31 223-241 200 292 33EH 11.3-11.7 1.13-1.17 ≥ 10.2 ≥ 812 ≥ 30 ≥ 2388 31-33 247-263 200 392 35EH 11.7-12.1 1.17-1.21 ≥ 10.2 ≥ 812 ≥ 30 ≥ 2388 33-36 263-287 200 392 38EH 12.1-12.5 1.21-1.25 ≥ 11.4 ≥ 907 ≥ 30 ≥ 2388 36-39 287-310 200 392 30AH 10.8-11.3 1.08-1.13 ≥ 10.2 ≥ 812 ≥ 35 ≥ 2785 28-32 223-255 220 428 33AH 11.2-11.7 1.12-1.17 ≥ 10.2 ≥ 812 ≥ 35 ≥ 2785 31-34 247-271 220 428

Ring Ndfeb Magnets Outer Radius*Inner Radius*Thickness*
Maximum150.0 mm95.0 mm50.0 mm
Minimum0.8 mm0.15 mm0.2 mm

Disc Ndfeb Magnets Diameter*Thickness*
Maximum150.0 mm75.0 mm
Minimum0.4 mm0.25 mm

Block Ndfeb Magnets Length*Width*Thickness*Diagonal*
Maximum200.0 mm95.0 mm50.0 mm150.0 mm
Minimum3.080 mm1.20 mm0.25 mm0.50 mm

Arc-segment Ndfeb Magnets Outer Radius*Inner Radius*Thickness*Degree*
Maximum75 mm65 mm50.00 mm150
Minimum1.9 mm