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MPL 40x18x10 SH / 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: 1-6500
Rating: 5

lamellar magnet

Catalog no 020157

GTIN/EAN: 5906301811633

5.00

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Load capacity

23.81 kg / 233.58 N

Magnetic Induction

366.66 mT / 3667 Gs

Coating

[NiCuNi] Nickel

technical parameters »

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Technical details - MPL 40x18x10 SH / N38 - lamellar magnet

Specification / characteristics - MPL 40x18x10 SH / N38 - lamellar magnet

properties

properties	values
Cat. no.	020157
GTIN/EAN	5906301811633
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	18 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	54 g
Magnetization Direction	↑ axial
Load capacity ~ ?	23.81 kg / 233.58 N
Magnetic Induction ~ ?	366.66 mT / 3667 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x18x10 SH / 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

Technical analysis of the magnet - report

Presented values represent the outcome of a mathematical calculation. Results are based on models for the class Nd₂Fe₁₄B. Real-world parameters might slightly differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - power drop
MPL 40x18x10 SH / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3666 Gs 366.6 mT	23.81 kg / 23810.0 g 233.6 N	critical level
1 mm	3399 Gs 339.9 mT	20.48 kg / 20476.1 g 200.9 N	critical level
2 mm	3120 Gs 312.0 mT	17.25 kg / 17245.9 g 169.2 N	critical level
3 mm	2841 Gs 284.1 mT	14.30 kg / 14304.1 g 140.3 N	critical level
5 mm	2321 Gs 232.1 mT	9.55 kg / 9547.8 g 93.7 N	medium risk
10 mm	1370 Gs 137.0 mT	3.32 kg / 3324.4 g 32.6 N	medium risk
15 mm	833 Gs 83.3 mT	1.23 kg / 1229.0 g 12.1 N	safe
20 mm	530 Gs 53.0 mT	0.50 kg / 498.1 g 4.9 N	safe
30 mm	244 Gs 24.4 mT	0.11 kg / 105.3 g 1.0 N	safe
50 mm	75 Gs 7.5 mT	0.01 kg / 9.9 g 0.1 N	safe

Pulling power drops drastically with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., dirt, varnish, rust) strongly diminishes the holding power. Neodymiums hold strongest at the point of direct contact; air break weakens the force. Observe how quickly the parameters drop, when the magnet does not adhere directly to the metal substrate. When designing the arrangement, discard redundant distances.

Table 2: Shear hold (vertical surface)
MPL 40x18x10 SH / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	4.76 kg / 4762.0 g 46.7 N
1 mm	Stal (~0.2)	4.10 kg / 4096.0 g 40.2 N
2 mm	Stal (~0.2)	3.45 kg / 3450.0 g 33.8 N
3 mm	Stal (~0.2)	2.86 kg / 2860.0 g 28.1 N
5 mm	Stal (~0.2)	1.91 kg / 1910.0 g 18.7 N
10 mm	Stal (~0.2)	0.66 kg / 664.0 g 6.5 N
15 mm	Stal (~0.2)	0.25 kg / 246.0 g 2.4 N
20 mm	Stal (~0.2)	0.10 kg / 100.0 g 1.0 N
30 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

The following data shows the theoretical force required to cause the slippage of the magnet vertically against a upright metal surface (assuming typical friction). This parameter is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x18x10 SH / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	7.14 kg / 7143.0 g 70.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	4.76 kg / 4762.0 g 46.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.38 kg / 2381.0 g 23.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	11.91 kg / 11905.0 g 116.8 N

When placing a magnet on a vertical surface (e.g., a fridge), it will only hold barely approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip cause that products slip faster than they pop off the substrate. Planning a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the holder will give way down under a much lighter weight. Utilizing a rubberized layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x18x10 SH / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.19 kg / 1190.5 g 11.7 N
1 mm	13%	2.98 kg / 2976.3 g 29.2 N
2 mm	25%	5.95 kg / 5952.5 g 58.4 N
5 mm	63%	14.88 kg / 14881.3 g 146.0 N
10 mm	100%	23.81 kg / 23810.0 g 233.6 N

A thin metal plate is unable to conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you require a sufficiently solid piece of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
MPL 40x18x10 SH / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	23.81 kg / 23810.0 g 233.6 N	OK
40 °C	-2.2%	23.29 kg / 23286.2 g 228.4 N	OK
60 °C	-4.4%	22.76 kg / 22762.4 g 223.3 N
80 °C	-6.6%	22.24 kg / 22238.5 g 218.2 N
100 °C	-28.8%	16.95 kg / 16952.7 g 166.3 N

Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this magnet. As the temperature rises, the magnet's force briefly lowers. Avoid using this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetism.

*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently under lower heat stress than long magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x18x10 SH / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	59.64 kg / 59645 g 585.1 N 5 034 Gs	N/A
1 mm	55.50 kg / 55499 g 544.4 N 7 072 Gs	49.95 kg / 49949 g 490.0 N ~0 Gs
2 mm	51.29 kg / 51293 g 503.2 N 6 799 Gs	46.16 kg / 46164 g 452.9 N ~0 Gs
3 mm	47.18 kg / 47176 g 462.8 N 6 520 Gs	42.46 kg / 42459 g 416.5 N ~0 Gs
5 mm	39.41 kg / 39410 g 386.6 N 5 959 Gs	35.47 kg / 35469 g 348.0 N ~0 Gs
10 mm	23.92 kg / 23918 g 234.6 N 4 643 Gs	21.53 kg / 21526 g 211.2 N ~0 Gs
20 mm	8.33 kg / 8328 g 81.7 N 2 739 Gs	7.49 kg / 7495 g 73.5 N ~0 Gs
50 mm	0.55 kg / 552 g 5.4 N 705 Gs	0.50 kg / 497 g 4.9 N ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a magnet and steel setup. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Hazards (implants) - warnings
MPL 40x18x10 SH / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	14.0 cm
Hearing aid	10 Gs (1.0 mT)	11.0 cm
Mechanical watch	20 Gs (2.0 mT)	8.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.5 cm
Car key	50 Gs (5.0 mT)	6.0 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

Extremely neodym field poses a large risk to electronic devices and pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MPL 40x18x10 SH / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.95 km/h (6.38 m/s)	1.10 J
30 mm	36.78 km/h (10.22 m/s)	2.82 J
50 mm	47.37 km/h (13.16 m/s)	4.67 J
100 mm	66.97 km/h (18.60 m/s)	9.34 J

Neodymium magnets are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
MPL 40x18x10 SH / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (P_c)
MPL 40x18x10 SH / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	26 060 Mx	260.6 µWb
P_c Coefficient	0.43	Low (Flat)

Flux value passing through the pole surface. Key data in coil applications and motors. The P_c coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x18x10 SH / N38

Environment	Effective steel pull	Effect
Air (land)	23.81 kg	Standard
Water (riverbed)	27.26 kg (+3.45 kg Buoyancy gain)	+14.5%

Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Note: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.43

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: 020157-2025

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x18x10 mm and a weight of 54 g, guarantees premium class connection. This rectangular block with a force of 233.58 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.

Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 23.81 kg can pinch very hard and cause hematomas. 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. They work great as invisible mounts 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.

Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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 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. 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), 18 mm (width), and 10 mm (thickness). The key parameter here is the holding force amounting to approximately 23.81 kg (force ~233.58 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 rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:

They retain attractive force for almost 10 years – the drop is just ~1% (according to analyses),
Magnets effectively protect themselves against demagnetization caused by external fields,
A magnet with a metallic nickel surface is more attractive,
Magnetic induction on the top side of the magnet is extremely intense,
Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to freedom in forming and the capacity to adapt to specific needs,
Huge importance in innovative solutions – they are used in magnetic memories, electric motors, diagnostic systems, as well as complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses 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 special holder, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
Limited ability of creating nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

Magnet power is the result of a measurement for optimal configuration, taking into account:

using a plate made of mild steel, functioning as a ideal flux conductor
with a cross-section of at least 10 mm
characterized by lack of roughness
with total lack of distance (without impurities)
during detachment in a direction vertical to the plane
at standard ambient temperature

Lifting capacity in real conditions – factors

In practice, the real power is determined by several key aspects, ranked from crucial:

Air gap (between the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, rust or dirt).
Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
Plate thickness – too thin steel causes magnetic saturation, causing part of the power to be escaped into the air.
Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
Thermal factor – hot environment weakens pulling force. Exceeding the limit 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, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

Powerful field

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

Dust explosion hazard

Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

No play value

Neodymium magnets are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires urgent medical intervention.

GPS Danger

GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Bodily injuries

Large magnets can smash fingers instantly. Under no circumstances put your hand between two strong magnets.

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Risk of cracking

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Cards and drives

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and pulling force.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?

MPL 40x18x10 SH / N38 - lamellar magnet

Technical details - MPL 40x18x10 SH / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the magnet - report

Table 1: Static force (force vs gap) - power drop MPL 40x18x10 SH / N38

Table 2: Shear hold (vertical surface) MPL 40x18x10 SH / N38

Table 3: Vertical assembly (sliding) - vertical pull MPL 40x18x10 SH / N38

Table 4: Material efficiency (substrate influence) - power losses MPL 40x18x10 SH / N38

Table 5: Thermal resistance (stability) - resistance threshold MPL 40x18x10 SH / N38

Table 6: Two magnets (attraction) - forces in the system MPL 40x18x10 SH / N38

Table 7: Hazards (implants) - warnings MPL 40x18x10 SH / N38

Table 8: Collisions (cracking risk) - collision effects MPL 40x18x10 SH / N38

Table 9: Corrosion resistance MPL 40x18x10 SH / N38

Table 10: Electrical data (Pc) MPL 40x18x10 SH / N38

Table 11: Hydrostatics and buoyancy MPL 40x18x10 SH / N38

1. Vertical hold

2. Steel thickness impact

3. Thermal stability

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

Chemical composition

Sustainability

Magnet pull force

Magnetic Induction

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Strengths as well as weaknesses of rare earth magnets.

Strengths

Weaknesses

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

Lifting capacity in real conditions – factors

Safety rules for work with NdFeB magnets

Powerful field

Dust explosion hazard

Nickel allergy

No play value

GPS Danger

Bodily injuries

Health Danger

Risk of cracking

Cards and drives

Maximum temperature

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MPL 40x18x10 SH / N38

Table 2: Shear hold (vertical surface)
MPL 40x18x10 SH / N38

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x18x10 SH / N38

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x18x10 SH / N38

Table 5: Thermal resistance (stability) - resistance threshold
MPL 40x18x10 SH / N38

Table 6: Two magnets (attraction) - forces in the system
MPL 40x18x10 SH / N38

Table 7: Hazards (implants) - warnings
MPL 40x18x10 SH / N38

Table 8: Collisions (cracking risk) - collision effects
MPL 40x18x10 SH / N38

Table 9: Corrosion resistance
MPL 40x18x10 SH / N38

Table 10: Electrical data (P_c)
MPL 40x18x10 SH / N38

Table 11: Hydrostatics and buoyancy
MPL 40x18x10 SH / N38