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neodymium magnets

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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN: 5906301811633

5

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Magnetic Induction

366.66 mT

Coating

[NiCuNi] nickel

36.29 with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

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MPL 40x18x10 SH / N38 - lamellar magnet
Specification/characteristics MPL 40x18x10 SH / N38 - lamellar magnet
properties
values
Cat. no.
020157
GTIN
5906301811633
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
↑ axial
Magnetic Induction ~ ?
366.66 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
coercivity bHc ?
10.8-11.5
kOe
coercivity bHc ?
860-915
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

Component MPL 40x18x10 SH / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 0 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x18x10 SH / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x18x10 SH / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 0 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x18x10 SH / N38 model is magnetized axially (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x18 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 18 mm (width), and 10 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 0 kg (force ~0 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of NdFeB magnets.

Besides their exceptional strength, neodymium magnets offer the following advantages:

  • They retain full power for nearly 10 years – the loss is just ~1% (in theory),
  • Neodymium magnets are distinguished by highly resistant to demagnetization caused by external interference,
  • In other words, due to the reflective finish of gold, the element looks attractive,
  • Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise shaping and modifying to defined applications,
  • Key role in modern industrial fields – they serve a role in computer drives, electric motors, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets and ways of using them

  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what contributes to it?

The load parameter shown concerns the maximum value, obtained under optimal environment, specifically:

  • using a sheet made of low-carbon steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with an ideally smooth contact surface
  • with direct contact (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower depending on the following factors, in order of importance:

  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and holding force.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet and the plate reduces the holding force.

Warnings

Combustion hazard

Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Warning for heart patients

Warning for patients: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Serious injuries

Mind your fingers. Two large magnets will join instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Data carriers

Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Magnetic interference

Remember: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, device, and GPS.

Magnets are brittle

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Sensitization to coating

Some people experience a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact might lead to a rash. It is best to use safety gloves.

Conscious usage

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Important!

Details about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98