Door Alarm Sensor Strong NdFeB Magnets

  • Application: Speaker Magnet
  • Coating: Nickel
  • Type: Permanent
  • Origin: Ningbo
  • Shape: Disc
  • Grade: N35
  • Specification: ROHS, SGS
Door Alarm Sensor Strong NdFeB N35 Magnets

1. Materials: Neodymium-Iron-Boron;

2. Grades: N33-N52, 33M-48M, 33H-48H, 30SH-45SH, 30UH-40UH and 30EH-38EH;

3. Sizes: According to customers' request;

4. Coatings: Ni, Zn, gold, copper, epoxy, chemical, parylene and so on; .

5. Applications: Sensors, motors, rotors, wind turbines/wind generators, loudspeakers, magnetic hooks, magnetic holder, filters automobiles and so on;

6. Utilizations of new Sintered NdFeB magnet techniques and equipment such as strip casting, HDDR technology;

7. High coercive force, the max operation temp is up to 200 degree centigrade or 380 curie temperature;

Technical data of Sintered NdFeB
Grade Br Hcb Hcj (BH)max  (Tw)
mT (kGs) kA/m (kOe) kA/m (kOe) kJ/m3 (MGOe)
N35 1170-1220 (11.7-12.2) ≥ 868 ( ≥ 10.9) ≥ 955 ( ≥ 12) 263-287 (33-36) 80 ºC
N38 1220-1250 (12.2-12.5) ≥ 899 ( ≥ 11.3) ≥ 955 ( ≥ 12) 287-310 (36-39) 80 ºC
N40 1250-1280 (12.5-12.8) ≥ 907 ( ≥ 11.4) ≥ 955 ( ≥ 12) 302-326 (38-41) 80 ºC
N42 1280-1320 (12.8-13.2) ≥ 915 ( ≥ 11.5) ≥ 955 ( ≥ 12) 318-342 (40-43) 80 ºC
N45 1320-1380 (13.2-13.8) ≥ 923 ( ≥ 11.6) ≥ 955 ( ≥ 12) 342-366 (43-46) 80 ºC
N48 1380-1420 (13.8-14.2) ≥ 923 ( ≥ 11.6) ≥ 876 ( ≥ 12) 366-390 (46-49) 80 ºC
N50 1400-1450 (14.0-14.5) ≥ 796 ( ≥ 10.0) ≥ 876 ( ≥ 11) 382-406 (48-51) 60 ºC
N52 1430-1480 (14.3-14.8) ≥ 796 ( ≥ 10.0) ≥ 876 ( ≥ 11) 398-422 (50-53) 60 ºC
30M 1080-1130 (10.8-11.3) ≥ 796 ( ≥ 10.0) ≥ 1114 ( ≥ 14) 223-247 (28-31) 100 ºC
33M 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 1114 ( ≥ 14) 247-263 (31-33) 100 ºC
35M 1170-1220 (11.7-12.2) ≥ 868 ( ≥ 10.9) ≥ 1114 ( ≥ 14) 263-287 (33-36) 100 ºC
38M 1220-1250 (12.2-12.5) ≥ 899 ( ≥ 11.3) ≥ 1114 ( ≥ 14) 287-310 (36-39) 100 ºC
40M 1250-1280 (12.5-12.8) ≥ 923 ( ≥ 11.6) ≥ 1114 ( ≥ 14) 302-326 (38-41) 100 ºC
42M 1280-1320 (12.8-13.2) ≥ 955 ( ≥ 12.0) ≥ 1114 ( ≥ 14) 318-342 (40-43) 100 ºC
45M 1320-1380 (13.2-13.8) ≥ 995 ( ≥ 12.5) ≥ 1114 ( ≥ 14) 342-366 (43-46) 100 ºC
48M 1360-1430 (13.6-14.3) ≥ 1027 ( ≥ 12.9) ≥ 1114 ( ≥ 14) 366-390 (46-49) 100 ºC
50M 1400-1450 (14.0-14.5) ≥ 1033 ( ≥ 13.0) ≥ 1114 ( ≥ 14) 382-406 (48-51) 100 ºC
30H 1080-1130 (10.8-11.3) ≥ 796 ( ≥ 10.0) ≥ 1353 ( ≥ 17) 223-247 (28-31) 120 ºC
33H 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 1353 ( ≥ 17) 247-271 (31-34) 120 ºC
35H 1170-1220 (11.7-12.2) ≥ 868 ( ≥ 10.9) ≥ 1353 ( ≥ 17) 263-287 (33-36) 120 ºC
38H 1220-1250 (12.2-12.5) ≥ 899 ( ≥ 11.3) ≥ 1353 ( ≥ 17) 287-310 (36-39) 120 ºC
40H 1250-1280 (12.5-12.8) ≥ 923 ( ≥ 11.6) ≥ 1353 ( ≥ 17) 302-326 (38-41) 120 ºC
42H 1280-1320 (12.8-13.2) ≥ 955 ( ≥ 12.0) ≥ 1353 ( ≥ 17) 318-342 (40-43) 120 ºC
45H 1300-1360 (13-13.6) ≥ 963 ( ≥ 12.1) ≥ 1353 ( ≥ 17) 326-358 (43-46) 120 ºC
48H 1370-1430 (13.7-14.3) ≥ 995 ( ≥ 12.5) ≥ 1353 ( ≥ 17) 366-390 (46-49) 120 ºC
30SH 1080-1130 (10.8-11.3) ≥ 804 ( ≥ 10.1) ≥ 1592 ( ≥ 20) 223-247 (28-31) 150 ºC
33SH 1130-1170 (11.3-11.7) ≥ 844 ( ≥ 10.6) ≥ 1592 ( ≥ 20) 247-271 (31-34) 150 ºC
35SH 1170-1220 (11.7-12.2) ≥ 876 ( ≥ 11.0) ≥ 1592 ( ≥ 20) 263-287 (33-36) 150 ºC
38SH 1220-1250 (12.2-12.5) ≥ 907 ( ≥ 11.4) ≥ 1592 ( ≥ 20) 287-310 (36-39) 150 ºC
40SH 1240-1280 (12.5-12.8) ≥ 939 ( ≥ 11.8) ≥ 1592 ( ≥ 20) 302-326 (38-41) 150 ºC
42SH 1280-1320 (12.8-13.2) ≥ 987 ( ≥ 12.4) ≥ 1592 ( ≥ 20) 318-342 (40-43) 150 ºC
45SH 1320-1380 (13.2-13.8) ≥ 1003 ( ≥ 12.6) ≥ 1592 ( ≥ 20) 342-366 (43-46) 150 ºC
28UH 1020-1080  (10.2-10.8) ≥ 764 ( ≥ 9.6) ≥ 1990 ( ≥ 25) 207-231 (26-29) 180 ºC
30UH 1080-1130  (10.8-11.3) ≥ 812 ( ≥ 10.2) ≥ 1990 ( ≥ 25) 223-247 (28-31) 180 ºC
33UH 1130-1170 (11.3-11.7) ≥ 852 ( ≥ 10.7) ≥ 1990 ( ≥ 25) 247-271 (31-34) 180 ºC
35UH 1180-1220 (11.8-12.2) ≥ 860 ( ≥ 10.8) ≥ 1990 ( ≥ 25) 263-287 (33-36) 180 ºC
38UH 1220-1250 (12.2-12.5) ≥ 876 ( ≥ 11.0) ≥ 1990 ( ≥ 25) 287-310 (36-39) 180 ºC
40UH 1240-1280 (12.5-12.8) ≥ 899 ( ≥ 11.3) ≥ 1990 ( ≥ 25) 302-326 (38-41) 180 ºC
28EH 1040-1090 (10.4-10.9) ≥ 780 ( ≥ 9.8) ≥ 2388 ( ≥ 30) 207-231 (26-29) 200 ºC
30EH 1080-1130 (10.8-11.3) ≥ 812 ( ≥ 10.2) ≥ 2388 ( ≥ 30) 223-247 (28-31) 200 ºC
33EH 1130-1170 (11.3-11.7) ≥ 836 ( ≥ 10.5) ≥ 2388 ( ≥ 30) 247-271 (31-34) 200 ºC
35EH 1170-1220 (11.7-12.2) ≥ 876 ( ≥ 11.0) ≥ 2388 ( ≥ 30) 263-287 (33-36) 200 ºC
38EH 1220-1250 (12.2-12.5) ≥ 899 ( ≥ 11.3) ≥ 2388 ( ≥ 30) 287-310 (36-39) 200 ºC
28AH 1040-1090 (10.4-10.9) ≥ 787 ( ≥ 9.9) ≥ 2624 ( ≥ 33) 207-231 (26-29) 230 ºC
30AH 1080-1130 (10.8-11.3) ≥ 819 ( ≥ 10.3) ≥ 2624 ( ≥ 33) 223-247 (28-31) 230 ºC
33AH 1130-1170 (11.3-11.7) ≥ 843 ( ≥ 10.6) ≥ 2624 ( ≥ 33) 247-271 (31-34) 230 ºC

Rotor Pump With Water-proff Cover

We are a world-leading technology-based enterprise focus on R&D and manufactures non-Newtonian fluid conveying equipment. We specialize in rotary pumps, homogeneous pumps and grinding pumps. We have obtained 11 invention Patents and 46 practical patents, and won many national honorary titles.


Twin-rotor lobe pump are multi-functional and bi-directional positive displacement pumps, produced with fine technology. These products use synchronic rotors, driven by a pair of synchronic gears in the gear box. Transmitted by the main shaft and the sub-shaft. The rotors move synchronically in counter-clockwise a directions, which, consequently, varies the pump capacity and builds up high vacuum capacity and emission pressure. It is particularly suitable to pump sanitary medium, high-corrosive and high-viscous medium.


Rotor pump with water-proff cover: The pump is equipped with a detachable protective cover for the whole machine, and the material is S.S., it can protect the motor, coupling and other parts from corrosion during on-site cleaning.


In the past 30 years, we dedicate to provide the scientific and professional solutions in fluid field. In the field of complex fluid transportation, our company's R&D technology, manufacturing technology, application technology is at the leading position in the world.


Durrex pumps can be widely used in food, consumer chemical, refined chemical, paper making, chemical fiber, pharmaceuticals, coating, etc. We will continue to focus on scientific research and innovation, improve the level of precision manufacturing, and continuously promote the intelligent development of fluid transportation industry, to create greater value for global users

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NINGBO DURREX PUMPS CO.,LTD , https://www.durrexlobepump.com