MPL 12.5x12.5x5 / N38 - lamellar magnet - ujęcie 2

Product available Ships today (order by 14:00)

MPL 12.5x12.5x5 / 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 020117

GTIN/EAN: 5906301811237

5.00

length

12.5 mm [±0,1 mm]

Width

12.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

5.86 g

Magnetization Direction

↑ axial

Load capacity

4.84 kg / 47.51 N

Magnetic Induction

360.91 mT / 3609 Gs

Coating

[NiCuNi] Nickel

2.83 ZŁ with VAT / pcs + price for transport

2.30 ZŁ net + 23% VAT / pcs

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MPL 12.5x12.5x5 / N38 - lamellar magnet

Specification / characteristics MPL 12.5x12.5x5 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020117
GTIN/EAN	5906301811237
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	12.5 mm [±0,1 mm]
Width	12.5 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	5.86 g
Magnetization Direction	↑ axial
Load capacity ~ ?	4.84 kg / 47.51 N
Magnetic Induction ~ ?	360.91 mT / 3609 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12.5x12.5x5 / 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 analysis of the product - technical parameters

Presented information constitute the result of a physical calculation. Values rely on algorithms for the class Nd₂Fe₁₄B. Actual conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
MPL 12.5x12.5x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3608 Gs 360.8 mT	4.84 kg / 4840.0 g 47.5 N	strong
1 mm	3156 Gs 315.6 mT	3.70 kg / 3704.2 g 36.3 N	strong
2 mm	2671 Gs 267.1 mT	2.65 kg / 2653.8 g 26.0 N	strong
3 mm	2211 Gs 221.1 mT	1.82 kg / 1817.7 g 17.8 N	weak grip
5 mm	1464 Gs 146.4 mT	0.80 kg / 797.6 g 7.8 N	weak grip
10 mm	538 Gs 53.8 mT	0.11 kg / 107.6 g 1.1 N	weak grip
15 mm	234 Gs 23.4 mT	0.02 kg / 20.4 g 0.2 N	weak grip
20 mm	119 Gs 11.9 mT	0.01 kg / 5.3 g 0.1 N	weak grip
30 mm	42 Gs 4.2 mT	0.00 kg / 0.7 g 0.0 N	weak grip
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Grip strength weakens drastically with every subsequent millimeter of distance. Remember that every additional insulation layer (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Magnetic products operate strongest in perfect adhesion; gap drastically cuts the power. Analyze how quickly the pull force drop, when the magnet does not adhere flatly to the metal substrate. When planning the assembly, discard additional spacers.

Table 2: Sliding Hold (Vertical Surface)
MPL 12.5x12.5x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.97 kg / 968.0 g 9.5 N
1 mm	Stal (~0.2)	0.74 kg / 740.0 g 7.3 N
2 mm	Stal (~0.2)	0.53 kg / 530.0 g 5.2 N
3 mm	Stal (~0.2)	0.36 kg / 364.0 g 3.6 N
5 mm	Stal (~0.2)	0.16 kg / 160.0 g 1.6 N
10 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
15 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section calculates the theoretical shear load required to cause the slippage of the magnet downwards on a upright steel wall (considering typical friction coefficient). The holding force is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 12.5x12.5x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.45 kg / 1452.0 g 14.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.97 kg / 968.0 g 9.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.48 kg / 484.0 g 4.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.42 kg / 2420.0 g 23.7 N

When hanging a magnet on a vertical surface (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip cause that holders slide down faster than they pop off the substrate. Planning a vertical fastening? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the element will slide down under a significantly smaller cargo. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - power losses
MPL 12.5x12.5x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.48 kg / 484.0 g 4.7 N
1 mm	25%	1.21 kg / 1210.0 g 11.9 N
2 mm	50%	2.42 kg / 2420.0 g 23.7 N
5 mm	100%	4.84 kg / 4840.0 g 47.5 N
10 mm	100%	4.84 kg / 4840.0 g 47.5 N

A too thin steel is incapable of absorb the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - power drop
MPL 12.5x12.5x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	4.84 kg / 4840.0 g 47.5 N	OK
40 °C	-2.2%	4.73 kg / 4733.5 g 46.4 N	OK
60 °C	-4.4%	4.63 kg / 4627.0 g 45.4 N
80 °C	-6.6%	4.52 kg / 4520.6 g 44.3 N
100 °C	-28.8%	3.45 kg / 3446.1 g 33.8 N

Classic neodymiums lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's power temporarily decreases. Avoid using this magnet near heat sources exceeding its safe range. Ignoring the limit will cause destruction of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 12.5x12.5x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	12.54 kg / 12536 g 123.0 N 5 069 Gs	N/A
1 mm	11.08 kg / 11080 g 108.7 N 6 783 Gs	9.97 kg / 9972 g 97.8 N ~0 Gs
2 mm	9.59 kg / 9594 g 94.1 N 6 312 Gs	8.63 kg / 8635 g 84.7 N ~0 Gs
3 mm	8.18 kg / 8176 g 80.2 N 5 827 Gs	7.36 kg / 7359 g 72.2 N ~0 Gs
5 mm	5.71 kg / 5714 g 56.1 N 4 871 Gs	5.14 kg / 5143 g 50.5 N ~0 Gs
10 mm	2.07 kg / 2066 g 20.3 N 2 929 Gs	1.86 kg / 1859 g 18.2 N ~0 Gs
20 mm	0.28 kg / 279 g 2.7 N 1 076 Gs	0.25 kg / 251 g 2.5 N ~0 Gs
50 mm	0.00 kg / 4 g 0.0 N 136 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a further horizon of action. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).

Table 7: Safety (HSE) (implants) - warnings
MPL 12.5x12.5x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.5 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Timepiece	20 Gs (2.0 mT)	4.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.5 cm
Car key	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field is a large risk to IT equipment and pacemakers. These neodymiums generate a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and glass. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 12.5x12.5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	29.38 km/h (8.16 m/s)	0.20 J
30 mm	50.21 km/h (13.95 m/s)	0.57 J
50 mm	64.81 km/h (18.00 m/s)	0.95 J
100 mm	91.65 km/h (25.46 m/s)	1.90 J

Magnetic elements are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MPL 12.5x12.5x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction Data (Flux)
MPL 12.5x12.5x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 874 Mx	58.7 µWb
P_c Coefficient	0.46	Low (Flat)

Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 12.5x12.5x5 / N38

Environment	Effective steel pull	Effect
Air (land)	4.84 kg	Standard
Water (riverbed)	5.54 kg (+0.70 kg Buoyancy gain)	+14.5%

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

In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Shear force

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

2. Plate thickness effect

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

3. Thermal stability

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.46

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.

Technical and environmental data

Material specification

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: 020117-2025

Measurement Calculator

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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 12.5x12.5x5 mm and a weight of 5.86 g, guarantees the highest quality connection. This rectangular block with a force of 47.51 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects 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 4.84 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 12.5x12.5x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 4.84 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 12.5x12.5x5 / N38, we recommend utilizing strong epoxy glues (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 12.5x12.5x5 / 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. In practice, this means that this magnet has the greatest attraction force on its main planes (12.5x12.5 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: 12.5 mm (length), 12.5 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 4.84 kg (force ~47.51 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their immense strength, neodymium magnets offer the following advantages:

They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
Neodymium magnets are characterized by extremely resistant to demagnetization caused by magnetic disturbances,
The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
They feature high magnetic induction at the operating surface, which improves attraction properties,
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 modularity in designing and the ability to customize to specific needs,
Key role in electronics industry – they are used in data components, electromotive mechanisms, precision medical tools, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Cons

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. 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
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
We recommend cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these devices are able to complicate diagnosis medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:

with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
with a cross-section of at least 10 mm
with a surface perfectly flat
with total lack of distance (no impurities)
for force applied at a right angle (in the magnet axis)
at conditions approx. 20°C

Lifting capacity in practice – influencing factors

In real-world applications, the actual holding force results from a number of factors, ranked from the most important:

Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be lost to the other side.
Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets

Conscious usage

Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often faster than you can move away.

Risk of cracking

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Protect data

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Maximum temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Metal Allergy

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Extended handling may cause an allergic reaction. We recommend use protective gloves.

Pacemakers

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

GPS and phone interference

A powerful magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Physical harm

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Adults only

Product intended for adults. Tiny parts pose a choking risk, causing severe trauma. Keep out of reach of children and animals.

Mechanical processing

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Caution! Learn more about risks in the article: Magnet Safety Guide.

MPL 12.5x12.5x5 / N38 - lamellar magnet

Not sure about your choice?

MPL 12.5x12.5x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - technical parameters

1. Shear force

2. Plate thickness effect

3. Thermal stability

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

Material specification

Environmental data

Force (Pull)

Magnetic Induction

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Advantages and disadvantages of neodymium magnets.

Strengths

Cons

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Lifting capacity in practice – influencing factors

Conscious usage

Risk of cracking

Protect data

Maximum temperature

Metal Allergy

Pacemakers

GPS and phone interference

Physical harm

Adults only

Mechanical processing

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C