D40x20mm Neodymium Magnet, 40 x 20mm Disc Magnet

Item No.: D40x20mm
Material: NdFeB, Grade N42
Shape: Disc
Dimension: 40mm dia. x 20mm thick
Tolerances: ±0.1mm x ±0.1mm
Weight: 188.496g
Grade: N42
Coating: Ni-Cu-Ni (Nickel)
Pull Force(lbs): 111.03 lbs (50.47kg)
Surface Field(Gauss): 4667 Gauss
Magnetization direction: Axial (Poles on Flat Ends)
Max Operating Temp: 80°C
Product Drawing: PDF drawing of D40x20mm · JPEG drawing of D40x20mm

Other Grade D40x20mm Neodymium Magnets (40mm dia. x 20mm thick):

Grade Item No. Product Name Pull Force Inquiry
N35 ALB-D40x20mm-N35 D40x20mm-N35 Neodymium Magnets 93.29 lbs (42.41kg) Inquiry
N38 ALB-D40x20mm-N38 D40x20mm-N38 Neodymium Magnets 93.29 lbs (42.41kg) Inquiry
N40 ALB-D40x20mm-N40 D40x20mm-N40 Neodymium Magnets 101.16 lbs (45.98kg) Inquiry
N42 ALB-D40x20mm D40x20mm Neodymium Magnets 111.03 lbs (50.47kg) Inquiry
N45 ALB-D40x20mm-N45 D40x20mm-N45 Neodymium Magnets 117.86 lbs (53.57kg) Inquiry
N48 ALB-D40x20mm-N48 D40x20mm-N48 Neodymium Magnets 124.89 lbs (56.77kg) Inquiry
N50 ALB-D40x20mm-N50 D40x20mm-N50 Neodymium Magnets 128.49 lbs (58.40kg) Inquiry
N52 ALB-D40x20mm-N52 D40x20mm-N52 Neodymium Magnets 132.13 lbs (60.06kg) Inquiry
N42SH ALB-D40x20mmSH D40x20mmSH Neodymium Magnets 111.03 lbs (50.47kg) Inquiry

High Temperature D40x20mm Neodymium Magnets (40mm dia. x 20mm thick) are also available:

Neodymium Material Type Maximum Operating Temp Curie Temp
N (N35-N52) 176°F (80°C) 590°F (310°C)
NM (N35M-N52M) 212°F (100°C) 644°F (340°C)
NH (N33H-N52H) 248°F (120°C) 644°F (340°C)
NSH (N30SH-N50SH) 302°F (150°C) 644°F (340°C)
NUH (N28UH-N48UH) 356°F (180°C) 662°F (350°C)
NEH (N28EH-N48EH) 392°F (200°C) 662°F (350°C)
NAH (N28AH-N35AH) 428°F (220°C) 662°F (350°C)

The Thermal Characteristics listed above are values commonly associated with each magnet's grade or material.  Actual performance in your application may vary with other factors, including the shape of the magnet, the Permeance Coefficient or load line, and how it is used in a circuit.  

D40x20mm Neodymium Magnets (40mm dia. x 20mm thick) with other Coating are also available:

Coating Type Overall Thickness Salt Spray Test Pressure Cooker Test
Ni-Cu-Ni (Nickel) 15-21 μm 24 hours 48 hours
NiCu + Black Nickel 15-21 μm 24 hours 48 hours
NiCuNi + Epoxy 20-28 μm 48 hours 72 hours
NiCuNi + Gold 16-23 μm 36 hours 72 hours
NiCuNi + Silver 16-23 μm 24 hours 48 hours
Zinc 7-15 μm 12 hours 24 hours

Each individual layer of Nickel and Copper are 5-7 μm thick. The Gold and Silver Coating layers are 1-2 μm thick. Test results shown to allow comparison between Coating options. Performance in your application under your specific test conditions may vary. Salt Spray testing conducted with a 5% NaCl solution, at 35°C. Pressure Cooker Test (PCT) conducted at 2 atm, 120°C at 100% RH.

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