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neodymium magnets

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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN: 5906301811565

5

length [±0,1 mm]

40 mm

Width [±0,1 mm]

10 mm

Height [±0,1 mm]

4 mm

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.32 kg / 61.98 N

Magnetic Induction

275.57 mT

Coating

[NiCuNi] nickel

4.87 with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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MPL 40x10x4 / N38 - lamellar magnet
Specification/characteristics MPL 40x10x4 / N38 - lamellar magnet
properties
values
Cat. no.
020150
GTIN
5906301811565
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
6.32 kg / 61.98 N
Magnetic Induction ~ ?
275.57 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

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x4 mm and a weight of 12 g, guarantees the highest quality connection. This magnetic block with a force of 61.98 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 40x10x4 / 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.
They constitute a key element in the production of generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x10x4 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x4 / N38 model is magnetized through the thickness (dimension 4 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 (40x10 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), 10 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 40x10x4 mm and a self-weight of 12 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

  • They do not lose power, even after around ten years – the reduction in power is only ~1% (according to tests),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a shiny gold surface has an effective appearance,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the ability to modify to specific needs,
  • Fundamental importance in innovative solutions – they serve a role in computer drives, drive modules, medical equipment, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Problematic aspects of neodymium magnets and ways of using them

  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 prevent oxidation and corrosion.
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The lifting capacity listed is a measurement result conducted under the following configuration:

  • using a base made of mild steel, acting as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Holding efficiency impacted by specific conditions, such as (from priority):

  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.

Safe handling of NdFeB magnets

Machining danger

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Medical interference

People with a ICD must maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.

GPS Danger

A strong magnetic field interferes with the operation of compasses in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Do not give to children

These products are not intended for children. Eating multiple magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Risk of cracking

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Heat warning

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Sensitization to coating

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid direct skin contact and opt for encased magnets.

Finger safety

Big blocks can break fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

Data carriers

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, timepieces).

Do not underestimate power

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Danger!

Want to know more? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98