DF4 Neodymium Magnets, 15/16 inch dia. x 1/4 inch thick

Item No.: ALB-DF4
Material: NdFeB, Grade N42
Shape: Disc
Dimension: 15/16" dia. x 1/4" thick
(23.81mm dia. X 6.35mm thick)
Tolerances: ±0.004" x ±0.004" (±0.1mm x ±0.1mm)
Weight: 0.748 oz. (21.2 g)
Grade: N42
Coating: Ni-Cu-Ni (Nickel)
Pull Force(lbs): 25.05 lbs
Surface Field(Gauss): 3105 Gauss
Magnetization direction: Axial (Poles on Flat Ends)
Max Operating Temp: 80°C
Product Drawing: PDF drawing of ALB-DF4 · JPEG drawing of ALB-DF4

Other Grade DF4 Neodymium Magnets (15/16" dia. x 1/4" thick):

Grade Item No. Product Name Pull Force Inquiry
N35 ALB-DF4-N35 DF4-N35 Neodymium Magnets 17.64 lbs Inquiry
N38 ALB-DF4-N38 DF4-N38 Neodymium Magnets 17.64 lbs Inquiry
N40 ALB-DF4-N40 DF4-N40 Neodymium Magnets 19.13 lbs Inquiry
N42 ALB-DF4 DF4 Neodymium Magnets 20.99 lbs Inquiry
N45 ALB-DF4-N45 DF4-N45 Neodymium Magnets 22.61 lbs Inquiry
N48 ALB-DF4-N48 DF4-N48 Neodymium Magnets 24.29 lbs Inquiry
N50 ALB-DF4-N50 DF4-N50 Neodymium Magnets 25.33 lbs Inquiry
N52 ALB-DF4-N52 DF4-N52 Neodymium Magnets 26.39 lbs Inquiry
N42SH ALB-DF4SH DF4SH Neodymium Magnets 20.99 lbs Inquiry

High Temperature DF4 Neodymium Magnets (15/16" dia. x 1/4" 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.  

DF4 Neodymium Magnets (15/16" dia. x 1/4" 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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providing you with reliable N35, N38, N42, N52, N42SH and other grade super neodymium magnets and SmCo rare earth magnets.

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