MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

Product available Ships tomorrow

MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: PLN 1-6500
Rating: 5

lamellar magnet

Catalog no 020154

GTIN/EAN: 5906301811602

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

11.35 kg / 111.37 N

Magnetic Induction

249.11 mT / 2491 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

15.07 ZŁ with VAT / pcs + price for transport

12.25 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

12.25 ZŁ

15.07 ZŁ

price from 50 pcs

11.51 ZŁ

14.16 ZŁ

price from 210 pcs

10.78 ZŁ

13.26 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Not sure about your choice?

Give us a call +48 22 499 98 98 alternatively send us a note using form the contact form page.
Specifications and shape of magnets can be reviewed using our online calculation tool.

Orders submitted before 14:00 will be dispatched today!

Physical properties - MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

properties

properties	values
Cat. no.	020154
GTIN/EAN	5906301811602
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	15 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	22.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	11.35 kg / 111.37 N
Magnetic Induction ~ ?	249.11 mT / 2491 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
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 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Physical modeling of the product - report

The following data constitute the outcome of a engineering simulation. Values are based on models for the class Nd₂Fe₁₄B. Actual performance may deviate from the simulation results. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
MPL 40x15x5x2[7/3.5] / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2490 Gs 249.0 mT	11.35 kg / 25.02 pounds 11350.0 g / 111.3 N	crushing
1 mm	2306 Gs 230.6 mT	9.73 kg / 21.45 pounds 9731.3 g / 95.5 N	medium risk
2 mm	2095 Gs 209.5 mT	8.03 kg / 17.70 pounds 8028.8 g / 78.8 N	medium risk
3 mm	1877 Gs 187.7 mT	6.45 kg / 14.21 pounds 6445.4 g / 63.2 N	medium risk
5 mm	1472 Gs 147.2 mT	3.97 kg / 8.74 pounds 3965.1 g / 38.9 N	medium risk
10 mm	792 Gs 79.2 mT	1.15 kg / 2.53 pounds 1147.1 g / 11.3 N	low risk
15 mm	454 Gs 45.4 mT	0.38 kg / 0.83 pounds 376.9 g / 3.7 N	low risk
20 mm	278 Gs 27.8 mT	0.14 kg / 0.31 pounds 141.4 g / 1.4 N	low risk
30 mm	122 Gs 12.2 mT	0.03 kg / 0.06 pounds 27.0 g / 0.3 N	low risk
50 mm	35 Gs 3.5 mT	0.00 kg / 0.01 pounds 2.3 g / 0.0 N	low risk

Pulling power weakens drastically per each millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products work most effectively in perfect adhesion; air break drastically cuts the force. Analyze how flashily the parameters plummet, when the magnet does not adhere directly to the metal substrate. When planning the arrangement, discard redundant distances.

Table 2: Shear hold (vertical surface)
MPL 40x15x5x2[7/3.5] / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	2.27 kg / 5.00 pounds 2270.0 g / 22.3 N
1 mm	Stal (~0.2)	1.95 kg / 4.29 pounds 1946.0 g / 19.1 N
2 mm	Stal (~0.2)	1.61 kg / 3.54 pounds 1606.0 g / 15.8 N
3 mm	Stal (~0.2)	1.29 kg / 2.84 pounds 1290.0 g / 12.7 N
5 mm	Stal (~0.2)	0.79 kg / 1.75 pounds 794.0 g / 7.8 N
10 mm	Stal (~0.2)	0.23 kg / 0.51 pounds 230.0 g / 2.3 N
15 mm	Stal (~0.2)	0.08 kg / 0.17 pounds 76.0 g / 0.7 N
20 mm	Stal (~0.2)	0.03 kg / 0.06 pounds 28.0 g / 0.3 N
30 mm	Stal (~0.2)	0.01 kg / 0.01 pounds 6.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

This section defines the theoretical holding capacity needed to initiate the downward movement of the magnet downwards on a vertical steel wall (assuming standard friction). The holding force is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x15x5x2[7/3.5] / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	3.41 kg / 7.51 pounds 3405.0 g / 33.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.27 kg / 5.00 pounds 2270.0 g / 22.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.14 kg / 2.50 pounds 1135.0 g / 11.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	5.68 kg / 12.51 pounds 5675.0 g / 55.7 N

When placing a magnet on a vertical surface (e.g., a board), it will only hold barely about 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders slip easier than they pop off the substrate. Want to create a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the element will give way down under a noticeably lighter cargo. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Steel thickness (saturation) - power losses
MPL 40x15x5x2[7/3.5] / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	0.57 kg / 1.25 pounds 567.5 g / 5.6 N
1 mm	13%	1.42 kg / 3.13 pounds 1418.8 g / 13.9 N
2 mm	25%	2.84 kg / 6.26 pounds 2837.5 g / 27.8 N
3 mm	38%	4.26 kg / 9.38 pounds 4256.3 g / 41.8 N
5 mm	63%	7.09 kg / 15.64 pounds 7093.8 g / 69.6 N
10 mm	100%	11.35 kg / 25.02 pounds 11350.0 g / 111.3 N
11 mm	100%	11.35 kg / 25.02 pounds 11350.0 g / 111.3 N
12 mm	100%	11.35 kg / 25.02 pounds 11350.0 g / 111.3 N

A too thin steel is incapable of conduct the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To achieve 100% of this magnet's power, you need a suitably thick piece of steel. The saturation effect means that on delicate walls (e.g., car bodies), the product holds weaker. We recommend selecting the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - power drop
MPL 40x15x5x2[7/3.5] / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	11.35 kg / 25.02 pounds 11350.0 g / 111.3 N	OK
40 °C	-2.2%	11.10 kg / 24.47 pounds 11100.3 g / 108.9 N	OK
60 °C	-4.4%	10.85 kg / 23.92 pounds 10850.6 g / 106.4 N
80 °C	-6.6%	10.60 kg / 23.37 pounds 10600.9 g / 104.0 N
100 °C	-28.8%	8.08 kg / 17.82 pounds 8081.2 g / 79.3 N

Standard neodymium magnets lose power after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this product. With increasing heat, the magnet's force briefly drops. Avoid using this product close to heaters exceeding its working range. Too high temperature will result in irreversible degradation of magnetism.

*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x15x5x2[7/3.5] / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	22.94 kg / 50.58 pounds 3 961 Gs	3.44 kg / 7.59 pounds 3441 g / 33.8 N	N/A
1 mm	21.37 kg / 47.11 pounds 4 807 Gs	3.21 kg / 7.07 pounds 3205 g / 31.4 N	19.23 kg / 42.40 pounds ~0 Gs
2 mm	19.67 kg / 43.37 pounds 4 612 Gs	2.95 kg / 6.50 pounds 2951 g / 28.9 N	17.70 kg / 39.03 pounds ~0 Gs
3 mm	17.94 kg / 39.55 pounds 4 404 Gs	2.69 kg / 5.93 pounds 2691 g / 26.4 N	16.15 kg / 35.59 pounds ~0 Gs
5 mm	14.58 kg / 32.15 pounds 3 971 Gs	2.19 kg / 4.82 pounds 2187 g / 21.5 N	13.12 kg / 28.93 pounds ~0 Gs
10 mm	8.01 kg / 17.67 pounds 2 944 Gs	1.20 kg / 2.65 pounds 1202 g / 11.8 N	7.21 kg / 15.90 pounds ~0 Gs
20 mm	2.32 kg / 5.11 pounds 1 583 Gs	0.35 kg / 0.77 pounds 348 g / 3.4 N	2.09 kg / 4.60 pounds ~0 Gs
50 mm	0.12 kg / 0.26 pounds 359 Gs	0.02 kg / 0.04 pounds 18 g / 0.2 N	0.11 kg / 0.24 pounds ~0 Gs
60 mm	0.05 kg / 0.12 pounds 243 Gs	0.01 kg / 0.02 pounds 8 g / 0.1 N	0.05 kg / 0.11 pounds ~0 Gs
70 mm	0.03 kg / 0.06 pounds 171 Gs	0.00 kg / 0.01 pounds 4 g / 0.0 N	0.02 kg / 0.05 pounds ~0 Gs
80 mm	0.01 kg / 0.03 pounds 124 Gs	0.00 kg / 0.00 pounds 2 g / 0.0 N	0.01 kg / 0.03 pounds ~0 Gs
90 mm	0.01 kg / 0.02 pounds 92 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.00 kg / 0.01 pounds 70 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two magnets attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a wider radius of action. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Estimates apply to sliding force of dual same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MPL 40x15x5x2[7/3.5] / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	10.5 cm
Hearing aid	10 Gs (1.0 mT)	8.0 cm
Timepiece	20 Gs (2.0 mT)	6.5 cm
Mobile device	40 Gs (4.0 mT)	5.0 cm
Car key	50 Gs (5.0 mT)	4.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation poses a real danger to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x15x5x2[7/3.5] / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	24.04 km/h (6.68 m/s)	0.50 J
30 mm	39.29 km/h (10.91 m/s)	1.34 J
50 mm	50.66 km/h (14.07 m/s)	2.23 J
100 mm	71.63 km/h (19.90 m/s)	4.45 J

Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x15x5x2[7/3.5] / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 40x15x5x2[7/3.5] / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	14 969 Mx	149.7 µWb
P_c Coefficient	0.26	Low (Flat)

Flux value emitted by the pole surface. Essential parameter when building generators as well as sensors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MPL 40x15x5x2[7/3.5] / N38

Environment	Effective steel pull	Effect
Air (land)	11.35 kg	Standard
Water (riverbed)	13.00 kg (+1.65 kg buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Shear force

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Power loss vs temp

*For N38 material, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.26

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data

Chemical composition

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Sustainability

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 020154-2026

Quick Unit Converter

Force (pull)

Kilograms (kg)

Pounds (lbs)

Field Strength

Induction (Gs)

Tesla (T)

Put your value in just one slot to see the conversion in all other fields right away.

UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

10.46 ZŁ brutto / pcs

Product available Ships tomorrow

HH 32x7.8 [M5] / N38 - through hole magnetic holder

17.96 ZŁ brutto / pcs

Product available Ships tomorrow

UMT 12x20 black / N38 - board holder

1.894 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 12x10x4 / N38 - lamellar magnet

1.697 ZŁ brutto / pcs

Model MPL 40x15x5x2[7/3.5] / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 111.37 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.

The key to success is shifting 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 40x15x5x2[7/3.5] / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 40x15x5x2[7/3.5] / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.

For mounting flat magnets MPL 40x15x5x2[7/3.5] / 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).

Standardly, the MPL 40x15x5x2[7/3.5] / N38 model is magnetized through the thickness (dimension 5 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. 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), 15 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 11.35 kg (force ~111.37 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
Magnets perfectly resist against loss of magnetization caused by ambient magnetic noise,
Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
Magnetic induction on the working layer of the magnet is very high,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to freedom in designing and the capacity to modify to complex applications,
Versatile presence in electronics industry – they are commonly used in data components, drive modules, medical equipment, as well as modern systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Due to limitations in creating threads and complex forms in magnets, we propose using a housing - magnetic mechanism.
Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The force parameter is a result of laboratory testing performed under specific, ideal conditions:

using a sheet made of low-carbon steel, acting as a ideal flux conductor
whose thickness reaches at least 10 mm
characterized by lack of roughness
without the slightest clearance between the magnet and steel
for force applied at a right angle (pull-off, not shear)
at room temperature

Magnet lifting force in use – key factors

Bear in mind that the application force may be lower depending on elements below, in order of importance:

Distance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets

Fire risk

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Keep away from electronics

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Electronic devices

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Beware of splinters

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Adults only

Adult use only. Small elements can be swallowed, causing serious injuries. Keep out of reach of kids and pets.

Medical interference

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Permanent damage

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Serious injuries

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Caution required

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?

MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

Physical properties - MPL 40x15x5x2[7/3.5] / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the product - report

Table 1: Static pull force (force vs gap) - characteristics MPL 40x15x5x2[7/3.5] / N38

Table 2: Shear hold (vertical surface) MPL 40x15x5x2[7/3.5] / N38

Table 3: Vertical assembly (sliding) - vertical pull MPL 40x15x5x2[7/3.5] / N38

Table 4: Steel thickness (saturation) - power losses MPL 40x15x5x2[7/3.5] / N38

Table 5: Working in heat (material behavior) - power drop MPL 40x15x5x2[7/3.5] / N38

Table 6: Two magnets (attraction) - forces in the system MPL 40x15x5x2[7/3.5] / N38

Table 7: Protective zones (implants) - precautionary measures MPL 40x15x5x2[7/3.5] / N38

Table 8: Dynamics (cracking risk) - collision effects MPL 40x15x5x2[7/3.5] / N38

Table 9: Coating parameters (durability) MPL 40x15x5x2[7/3.5] / N38

Table 10: Construction data (Flux) MPL 40x15x5x2[7/3.5] / N38

Table 11: Submerged application MPL 40x15x5x2[7/3.5] / N38

1. Shear force

2. Steel thickness impact

3. Power loss vs temp

4. Demagnetization curve and operating point (B-H)

Chemical composition

Sustainability

Force (pull)

Field Strength

See also products

UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

HH 32x7.8 [M5] / N38 - through hole magnetic holder

UMT 12x20 black / N38 - board holder

MPL 12x10x4 / N38 - lamellar magnet

Strengths as well as weaknesses of neodymium magnets.

Pros

Weaknesses

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet lifting force in use – key factors

Safe handling of NdFeB magnets

Fire risk

Keep away from electronics

Electronic devices

Beware of splinters

Adults only

Medical interference

Permanent damage

Serious injuries

Sensitization to coating

Caution required

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MPL 40x15x5x2[7/3.5] / N38

Table 2: Shear hold (vertical surface)
MPL 40x15x5x2[7/3.5] / N38

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x15x5x2[7/3.5] / N38

Table 4: Steel thickness (saturation) - power losses
MPL 40x15x5x2[7/3.5] / N38

Table 5: Working in heat (material behavior) - power drop
MPL 40x15x5x2[7/3.5] / N38

Table 6: Two magnets (attraction) - forces in the system
MPL 40x15x5x2[7/3.5] / N38

Table 7: Protective zones (implants) - precautionary measures
MPL 40x15x5x2[7/3.5] / N38

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x15x5x2[7/3.5] / N38

Table 9: Coating parameters (durability)
MPL 40x15x5x2[7/3.5] / N38

Table 10: Construction data (Flux)
MPL 40x15x5x2[7/3.5] / N38

Table 11: Submerged application
MPL 40x15x5x2[7/3.5] / N38