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MPL 45x25x10 / 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 020164

GTIN/EAN: 5906301811701

5.00

length

45 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

84.38 g

Magnetization Direction

↑ axial

Load capacity

28.48 kg / 279.40 N

Magnetic Induction

306.29 mT / 3063 Gs

Coating

[NiCuNi] Nickel

35.01 ZŁ with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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MPL 45x25x10 / N38 - lamellar magnet

Specification / characteristics MPL 45x25x10 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020164
GTIN/EAN	5906301811701
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	45 mm [±0,1 mm]
Width	25 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	84.38 g
Magnetization Direction	↑ axial
Load capacity ~ ?	28.48 kg / 279.40 N
Magnetic Induction ~ ?	306.29 mT / 3063 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 45x25x10 / 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 simulation of the product - report

Presented information represent the direct effect of a mathematical simulation. Results rely on algorithms for the material Nd₂Fe₁₄B. Actual parameters may deviate from the simulation results. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - power drop
MPL 45x25x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3062 Gs 306.2 mT	28.48 kg / 28480.0 g 279.4 N	critical level
1 mm	2918 Gs 291.8 mT	25.86 kg / 25856.7 g 253.7 N	critical level
2 mm	2760 Gs 276.0 mT	23.13 kg / 23133.2 g 226.9 N	critical level
3 mm	2595 Gs 259.5 mT	20.45 kg / 20449.5 g 200.6 N	critical level
5 mm	2261 Gs 226.1 mT	15.53 kg / 15525.8 g 152.3 N	critical level
10 mm	1529 Gs 152.9 mT	7.10 kg / 7096.1 g 69.6 N	strong
15 mm	1018 Gs 101.8 mT	3.15 kg / 3147.4 g 30.9 N	strong
20 mm	688 Gs 68.8 mT	1.44 kg / 1439.4 g 14.1 N	safe
30 mm	340 Gs 34.0 mT	0.35 kg / 350.8 g 3.4 N	safe
50 mm	111 Gs 11.1 mT	0.04 kg / 37.1 g 0.4 N	safe

Grip strength weakens significantly with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., dirt, paint, veneer) significantly reduces the pull force. Neodymiums hold most effectively during direct contact; gap drastically cuts the power. Analyze how quickly the load capacity plummet, when the magnet does not touch tightly to the steel surface. When planning the arrangement, discard redundant distances.

Table 2: Slippage load (wall)
MPL 45x25x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	5.70 kg / 5696.0 g 55.9 N
1 mm	Stal (~0.2)	5.17 kg / 5172.0 g 50.7 N
2 mm	Stal (~0.2)	4.63 kg / 4626.0 g 45.4 N
3 mm	Stal (~0.2)	4.09 kg / 4090.0 g 40.1 N
5 mm	Stal (~0.2)	3.11 kg / 3106.0 g 30.5 N
10 mm	Stal (~0.2)	1.42 kg / 1420.0 g 13.9 N
15 mm	Stal (~0.2)	0.63 kg / 630.0 g 6.2 N
20 mm	Stal (~0.2)	0.29 kg / 288.0 g 2.8 N
30 mm	Stal (~0.2)	0.07 kg / 70.0 g 0.7 N
50 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N

This section shows the estimated holding capacity required to cause the shifting of the magnet downwards along a upright steel plate (considering standard friction). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 45x25x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	8.54 kg / 8544.0 g 83.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	5.70 kg / 5696.0 g 55.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.85 kg / 2848.0 g 27.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	14.24 kg / 14240.0 g 139.7 N

When placing a holder on a vertical plane (e.g., a car body), it will only hold just approx. 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip cause that magnets move down faster than they detach. Want to create a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will give way down under a significantly smaller cargo. Utilizing a rubberized pad can drastically improve the result.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 45x25x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.42 kg / 1424.0 g 14.0 N
1 mm	13%	3.56 kg / 3560.0 g 34.9 N
2 mm	25%	7.12 kg / 7120.0 g 69.8 N
5 mm	63%	17.80 kg / 17800.0 g 174.6 N
10 mm	100%	28.48 kg / 28480.0 g 279.4 N

A thin metal plate cannot absorb the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a thin surface, the flux will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MPL 45x25x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	28.48 kg / 28480.0 g 279.4 N	OK
40 °C	-2.2%	27.85 kg / 27853.4 g 273.2 N	OK
60 °C	-4.4%	27.23 kg / 27226.9 g 267.1 N
80 °C	-6.6%	26.60 kg / 26600.3 g 260.9 N
100 °C	-28.8%	20.28 kg / 20277.8 g 198.9 N

Ordinary NdFeB products irreversibly lose strength above the temperature limit. Watch out for overheating – high temperature can irreversibly damage this product. With every degree above norm, the neodymium's force temporarily drops. Do not use this magnet close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 45x25x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	65.04 kg / 65044 g 638.1 N 4 590 Gs	N/A
1 mm	62.12 kg / 62117 g 609.4 N 5 985 Gs	55.91 kg / 55906 g 548.4 N ~0 Gs
2 mm	59.05 kg / 59053 g 579.3 N 5 836 Gs	53.15 kg / 53148 g 521.4 N ~0 Gs
3 mm	55.95 kg / 55947 g 548.8 N 5 680 Gs	50.35 kg / 50352 g 494.0 N ~0 Gs
5 mm	49.74 kg / 49743 g 488.0 N 5 356 Gs	44.77 kg / 44769 g 439.2 N ~0 Gs
10 mm	35.46 kg / 35459 g 347.9 N 4 522 Gs	31.91 kg / 31913 g 313.1 N ~0 Gs
20 mm	16.21 kg / 16206 g 159.0 N 3 057 Gs	14.59 kg / 14586 g 143.1 N ~0 Gs
50 mm	1.58 kg / 1580 g 15.5 N 955 Gs	1.42 kg / 1422 g 14.0 N ~0 Gs

Two magnets attract each other from a significantly greater distance than a magnet and sheet combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*Field value between like poles drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Protective zones (electronics) - warnings
MPL 45x25x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	16.0 cm
Hearing aid	10 Gs (1.0 mT)	12.5 cm
Mechanical watch	20 Gs (2.0 mT)	10.0 cm
Mobile device	40 Gs (4.0 mT)	7.5 cm
Remote	50 Gs (5.0 mT)	7.0 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

Extremely neodym field is a large risk to IT equipment as well as pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MPL 45x25x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.22 km/h (5.89 m/s)	1.47 J
30 mm	32.34 km/h (8.98 m/s)	3.40 J
50 mm	41.46 km/h (11.52 m/s)	5.60 J
100 mm	58.59 km/h (16.28 m/s)	11.18 J

NdFeB products are very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can cause material chips or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
MPL 45x25x10 / 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)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 45x25x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	35 829 Mx	358.3 µWb
P_c Coefficient	0.36	Low (Flat)

Total magnetic flux passing through the pole surface. Key data when building generators as well as sensors. P_c value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 45x25x10 / N38

Environment	Effective steel pull	Effect
Air (land)	28.48 kg	Standard
Water (riverbed)	32.61 kg (+4.13 kg Buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Vertical hold

*Note: On a vertical surface, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.36

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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.

Engineering data and GPSR

Elemental analysis

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%

Environmental data

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: 020164-2025

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 45x25x10 mm and a weight of 84.38 g, guarantees premium class connection. As a block magnet with high power (approx. 28.48 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

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. Watch your fingers! Magnets with a force of 28.48 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 45x25x10 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

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).

The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (45x25 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.

This model is characterized by dimensions 45x25x10 mm, which, at a weight of 84.38 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 28.48 kg (force ~279.40 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Strengths

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

They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
In other words, due to the shiny surface of nickel, the element gains a professional look,
Magnetic induction on the top side of the magnet is exceptional,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of exact shaping and modifying to defined applications,
Wide application in advanced technology sectors – they are utilized in computer drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in miniature devices

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets experience a drop in strength. 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
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

The declared magnet strength represents the peak performance, recorded under ideal test conditions, namely:

with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
possessing a thickness of min. 10 mm to ensure full flux closure
characterized by even structure
without any clearance between the magnet and steel
during detachment in a direction vertical to the plane
at ambient temperature room level

Key elements affecting lifting force

Effective lifting capacity is influenced by working environment parameters, mainly (from priority):

Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
Direction of force – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Fragile material

Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them cracking into shards.

Safe operation

Handle with care. Rare earth magnets act from a long distance and snap with massive power, often faster than you can react.

Demagnetization risk

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Precision electronics

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Dust is flammable

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Physical harm

Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Do not give to children

Always store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Danger to pacemakers

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and select encased magnets.

Magnetic media

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?

MPL 45x25x10 / N38 - lamellar magnet

Not sure about your choice?

MPL 45x25x10 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the product - report

1. Vertical hold

2. Steel thickness impact

3. Temperature resistance

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

Elemental analysis

Environmental data

Pulling force

Magnetic Induction

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UMP 75x25 [M10x3] GW F200 GOLD / N42 - search holder

MW 12x3 / N38 - cylindrical magnet

MW 9x3 / N38 - cylindrical magnet

Pros as well as cons of rare earth magnets.

Strengths

Cons

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Key elements affecting lifting force

Fragile material

Safe operation

Demagnetization risk

Precision electronics

Dust is flammable

Physical harm

Do not give to children

Danger to pacemakers

Sensitization to coating

Magnetic media

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C