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MPL 40x5x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020402

GTIN: 5906301811916

length

40 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

4.5 g

Magnetization Direction

↑ axial

Load capacity

2 kg / 19.62 N

Magnetic Induction

348.83 mT

Coating

[NiCuNi] Nickel

6.65 ZŁ with VAT / pcs + price for transport

5.41 ZŁ net + 23% VAT / pcs

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MPL 40x5x3 / N38 - lamellar magnet

Specification / characteristics MPL 40x5x3 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020402
GTIN	5906301811916
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
length	40 mm [±0,1 mm]
Width	5 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	4.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2 kg / 19.62 N
Magnetic Induction ~ ?	348.83 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x5x3 / N38 - lamellar magnet

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

Magnetic Efficiency Report

The following data is a result of physical simulation. Values may change depending on the operating environment.

Table 1: Pull Force vs Distance Function
MPL 40x5x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4704 Gs 470.4 mT	9.01 kg / 9011.3 g 88.4 N	Medium
1 mm	3414 Gs 341.4 mT	4.75 kg / 4745.3 g 46.6 N	Medium
2 mm	2350 Gs 235.0 mT	2.25 kg / 2249.4 g 22.1 N	Medium
5 mm	664 Gs 66.4 mT	0.18 kg / 179.4 g 1.8 N	Safe
10 mm	235 Gs 23.5 mT	0.02 kg / 22.6 g 0.2 N	Safe
15 mm	116 Gs 11.6 mT	0.01 kg / 5.5 g 0.1 N	Safe
20 mm	67 Gs 6.7 mT	0.00 kg / 1.8 g 0.0 N	Safe
30 mm	27 Gs 2.7 mT	0.00 kg / 0.3 g 0.0 N	Safe
50 mm	8 Gs 0.8 mT	0.00 kg / 0.0 g 0.0 N	Safe

The magnetic field in the air weakens exponentially – every millimeter counts. Air gap is the biggest enemy of holding force in technical applications.

Table 2: Magnet Behavior on Slippery Surfaces
MPL 40x5x3 / N38

Surface Type	Friction Coeff.	Max Load (kg)
Raw Steel	µ = 0.3	2.70 kg / 2703.4 g 26.5 N
Painted Steel (Standard)	µ = 0.2	1.80 kg / 1802.3 g 17.7 N
Greasy/Slippery Steel	µ = 0.1	0.90 kg / 901.1 g 8.8 N
Magnet with Anti-slip Rubber	µ = 0.5	4.51 kg / 4505.7 g 44.2 N

When hanging a magnet on a vertical wall (e.g., a fridge), it will hold only about 1/5 of its nominal power. Using anti-slip rubber can significantly improve the result.

Table 3: Material Efficiency (Steel Thickness)
MPL 40x5x3 / N38

Steel Thickness (mm)	% Efficiency	Real Pull Force (kg)
0.5 mm	10%	0.90 kg / 901.1 g 8.8 N
1 mm	25%	2.25 kg / 2252.8 g 22.1 N
2 mm	50%	4.51 kg / 4505.7 g 44.2 N
5 mm	100%	9.01 kg / 9011.3 g 88.4 N
10 mm	100%	9.01 kg / 9011.3 g 88.4 N

A strong magnet on a 0.5mm sheet will work only at a fraction of its capacity. Check if your mounting surface is not too thin.

Table 4: Behavior in Heat
MPL 40x5x3 / N38

Ambient Temp. (°C)	Power Loss	Remaining Pull	Status
20 °C	0.0%	9.01 kg / 9011.3 g 88.4 N	OK
40 °C	-2.2%	8.81 kg / 8813.1 g 86.5 N	OK
60 °C	-4.4%	8.61 kg / 8614.8 g 84.5 N	OK
80 °C	-6.6%	8.42 kg / 8416.6 g 82.6 N
100 °C	-28.8%	6.42 kg / 6416.1 g 62.9 N

Exceeding the critical threshold will cause irreversible loss of magnetic properties. Specialized high-temperature magnets are required for work in ovens or engines.

Table 5: Magnet-to-Magnet System (Attract/Repel)
MPL 40x5x3 / N38

Air Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	13.52 kg / 13515.0 g 132.6 N	N/A
2 mm	3.38 kg / 3375.0 g 33.1 N	3.15 kg / 3150.0 g 30.9 N
5 mm	0.27 kg / 270.0 g 2.6 N	0.25 kg / 252.0 g 2.5 N
10 mm	0.03 kg / 30.0 g 0.3 N	0.03 kg / 28.0 g 0.3 N
20 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnets attract each other from a much greater distance than a magnet and steel. Use non-magnetic tools when manipulating a pair of magnets.

Table 6: Implant and Data Hazards
MPL 40x5x3 / N38

Object / Device	Limit (Gauss) / mT	Safe Distance
Pacemaker	5 Gs (0.5 mT)	6.0 cm
Hearing Aid / Implant	10 Gs (1.0 mT)	4.5 cm
Mechanical Watch	20 Gs (2.0 mT)	3.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Car Key	50 Gs (5.0 mT)	2.5 cm
Credit Card	400 Gs (40.0 mT)	1.0 cm
Hard Drive (HDD)	600 Gs (60.0 mT)	1.0 cm

Ignoring the power of this magnet can cost health or loss of valuable data. In addition to pacemakers, neurostimulators and hearing aids are also at risk. Also at risk are: mechanical watches, car keys, speakers, and screens.

Table 7: Breakage Risk Analysis
MPL 40x5x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	45.20 km/h (12.56 m/s)	0.35 J
30 mm	78.17 km/h (21.71 m/s)	1.06 J
50 mm	100.92 km/h (28.03 m/s)	1.77 J
100 mm	142.72 km/h (39.64 m/s)	3.54 J

Collision at a speed of several dozen km/h almost guarantees magnet destruction. We recommend carefully sliding the magnet onto the edge of the material.

Table 8: Surface Protection Specs
MPL 40x5x3 / N38

Technical Parameter	Value / Description
Coating Type	[NiCuNi] Nickel
Layer Structure	Nickel - Copper - Nickel
Layer Thickness	10-20 µm
Salt Spray Test (SST) ?	24 h
Recommended Environment	Indoors only (dry)

Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installation in bathrooms or outdoors.

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x5x3 mm and a weight of 4.5 g, guarantees the highest quality connection. As a block magnet with high power (approx. 2 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects 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 40x5x3 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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 wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 40x5x3 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.

Standardly, the MPL 40x5x3 / N38 model is magnetized axially (dimension 3 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 5 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 40x5x3 mm and a self-weight of 4.5 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 rare earth magnets.

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

They do not lose magnetism, even after around 10 years – the reduction in lifting capacity is only ~1% (according to tests),
Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
By using a lustrous coating of silver, the element acquires an professional look,
The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
In view of the potential of precise molding and adaptation to specialized needs, magnetic components can be manufactured in a variety of shapes and sizes, which expands the range of possible applications,
Universal use in innovative solutions – they are used in computer drives, drive modules, diagnostic systems, as well as industrial machines.
Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets: tips and applications.

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
We warn that neodymium magnets can lose their strength 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. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
We recommend a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
Possible danger 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 in case of swallowing.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what affects it?

The load parameter shown concerns the maximum value, measured under ideal test conditions, specifically:

using a plate made of mild steel, functioning as a magnetic yoke
possessing a thickness of min. 10 mm to avoid saturation
with an polished touching surface
without the slightest air gap between the magnet and steel
under vertical application of breakaway force (90-degree angle)
at temperature room level

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity is determined by many variables, presented from crucial:

Air gap (between the magnet and the plate), since even a very small distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.

Warnings

Warning for heart patients

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Keep away from electronics

A powerful magnetic field interferes with the operation of compasses in phones and navigation systems. Maintain magnets close to a device to avoid breaking the sensors.

Magnets are brittle

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Power loss in heat

Keep cool. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Hand protection

Big blocks can break fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

Fire risk

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safe distance

Do not bring magnets near a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Respect the power

Handle magnets consciously. Their immense force can shock even experienced users. Stay alert and respect their force.

Keep away from children

Always store magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.

Caution!

More info about hazards in the article: Safety of working with magnets.

MPL 40x5x3 / N38 - lamellar magnet

MPL 40x5x3 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Magnetic Efficiency Report

See more proposals

MW 12x4 / N52 - cylindrical magnet

SM 32x500 [2xM8] / N42 - magnetic separator

UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread

BM 750x180x70 [4x M8] - magnetic beam

Pros as well as cons of rare earth magnets.

Magnetic strength at its maximum – what affects it?

Magnet lifting force in use – key factors

Warnings

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C