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MPL 25x10x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020387

GTIN/EAN: 5906301811862

5.00

length

25 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

4.14 kg / 40.56 N

Magnetic Induction

230.69 mT / 2307 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

3.57 ZŁ with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 25x10x3 / N38 - lamellar magnet

Specification / characteristics - MPL 25x10x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020387
GTIN/EAN 5906301811862
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 25 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.56 N
Magnetic Induction ~ ? 230.69 mT / 2307 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x10x3 / 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

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 modeling of the magnet - data

These values are the outcome of a mathematical simulation. Results rely on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 25x10x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2306 Gs
230.6 mT
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
 strong
1 mm 2050 Gs
205.0 mT
 3.27 kg / 7.21 pounds
3272.4 g / 32.1 N
 strong
2 mm 1752 Gs
175.2 mT
 2.39 kg / 5.27 pounds
2388.9 g / 23.4 N
 strong
3 mm 1463 Gs
146.3 mT
 1.67 kg / 3.68 pounds
1667.1 g / 16.4 N
 low risk
5 mm 1000 Gs
100.0 mT
 0.78 kg / 1.72 pounds
779.2 g / 7.6 N
 low risk
10 mm 416 Gs
41.6 mT
 0.13 kg / 0.30 pounds
134.4 g / 1.3 N
 low risk
15 mm 200 Gs
20.0 mT
 0.03 kg / 0.07 pounds
31.0 g / 0.3 N
 low risk
20 mm 108 Gs
10.8 mT
 0.01 kg / 0.02 pounds
9.0 g / 0.1 N
 low risk
30 mm 40 Gs
4.0 mT
 0.00 kg / 0.00 pounds
1.3 g / 0.0 N
 low risk
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 low risk
Pulling power drops drastically with every mm of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) noticeably diminishes the holding power. Magnets operate optimally during direct contact; gap kills the force. See how rapidly the load capacity drop, when the product does not adhere directly to the metal substrate. When calculating the assembly, avoid additional spacers.

Table 2: Sliding load (wall)
MPL 25x10x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 pounds
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.65 kg / 1.44 pounds
654.0 g / 6.4 N
2 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
3 mm Stal (~0.2) 0.33 kg / 0.74 pounds
334.0 g / 3.3 N
5 mm Stal (~0.2) 0.16 kg / 0.34 pounds
156.0 g / 1.5 N
10 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the approximate weight limit sufficient to start the shifting of the magnet downwards against a upright steel wall (considering standard friction coefficient). This value is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 25x10x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 pounds
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
When placing a holder on a upright surface (e.g., a fridge), it will maintain just approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that holders move down easier than they pop off the substrate. Planning a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter weight. Application of an anti-slip coating can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 25x10x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.41 kg / 0.91 pounds
414.0 g / 4.1 N
1 mm
25%
 1.04 kg / 2.28 pounds
1035.0 g / 10.2 N
2 mm
50%
 2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
3 mm
75%
 3.10 kg / 6.85 pounds
3105.0 g / 30.5 N
5 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
10 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
11 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
12 mm
100%
 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
A thin metal plate is not enough to absorb the entire magnetic field, which wastes potential of the magnet. Should you attach a powerful product 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 require a sufficiently solid backing of metal. The saturation effect causes that on thin elements (e.g., car bodies), the magnet works worse. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
MPL 25x10x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
 OK
40 °C -2.2% 4.05 kg / 8.93 pounds
4048.9 g / 39.7 N
 OK
60 °C -4.4% 3.96 kg / 8.73 pounds
3957.8 g / 38.8 N
80 °C -6.6% 3.87 kg / 8.52 pounds
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 pounds
2947.7 g / 28.9 N
Classic neodymiums irreversibly lose parameters past the thermal threshold. Avoid high temperatures – excessive heat can permanently damage this product. With increasing heat, the neodymium's force temporarily drops. Refrain from using this product close to heaters exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 25x10x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.20 kg / 18.07 pounds
3 767 Gs
1.23 kg / 2.71 pounds
1230 g / 12.1 N
 N/A
1 mm 7.38 kg / 16.27 pounds
4 377 Gs
1.11 kg / 2.44 pounds
1107 g / 10.9 N
 6.64 kg / 14.65 pounds
~0 Gs
2 mm 6.48 kg / 14.28 pounds
4 101 Gs
0.97 kg / 2.14 pounds
972 g / 9.5 N
 5.83 kg / 12.86 pounds
~0 Gs
3 mm 5.58 kg / 12.30 pounds
3 805 Gs
0.84 kg / 1.84 pounds
837 g / 8.2 N
 5.02 kg / 11.07 pounds
~0 Gs
5 mm 3.97 kg / 8.74 pounds
3 208 Gs
0.59 kg / 1.31 pounds
595 g / 5.8 N
 3.57 kg / 7.87 pounds
~0 Gs
10 mm 1.54 kg / 3.40 pounds
2 001 Gs
0.23 kg / 0.51 pounds
231 g / 2.3 N
 1.39 kg / 3.06 pounds
~0 Gs
20 mm 0.27 kg / 0.59 pounds
831 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
 0.24 kg / 0.53 pounds
~0 Gs
50 mm 0.01 kg / 0.01 pounds
127 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
80 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
38 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
27 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
20 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a larger range of action. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Estimates refer to friction force of a pair of same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MPL 25x10x3 / 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
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 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
Extremely neodym field is a large risk to IT equipment and pacemakers. These neodymiums produce a field that destroys function of digital equipment. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MPL 25x10x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.90 km/h
(7.75 m/s)
 0.17 J
30 mm 47.38 km/h
(13.16 m/s)
 0.49 J
50 mm 61.15 km/h
(16.99 m/s)
 0.81 J
100 mm 86.48 km/h
(24.02 m/s)
 1.62 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
MPL 25x10x3 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 25x10x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 928 Mx 59.3 µWb
Pc Coefficient 0.25 Low (Flat)
Flux value emitted by the magnet pole. Key data when building generators as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MPL 25x10x3 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 kg buoyancy gain)
+14.5%
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. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

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 Pc (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 Pc 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
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%
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: 020387-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
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Model MPL 25x10x3 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 40.56 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.
Separating strong flat 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 4.14 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 4.14 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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: 25 mm (length), 10 mm (width), and 3 mm (thickness). The key parameter here is the holding force amounting to approximately 4.14 kg (force ~40.56 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around 10 years it drops only by ~1% (according to research),
  • Neodymium magnets remain extremely resistant to magnetic field loss caused by external interference,
  • In other words, due to the glossy finish of silver, the element gains visual value,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in constructing and the capacity to adapt to individual projects,
  • Huge importance in modern industrial fields – they serve a role in magnetic memories, brushless drives, precision medical tools, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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 rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex forms - preferred is a housing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity represents the limit force, obtained under laboratory conditions, specifically:
  • with the contact of a yoke made of special test steel, ensuring maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with an ground contact surface
  • with total lack of distance (without coatings)
  • during pulling in a direction vertical to the mounting surface
  • in neutral thermal conditions

Key elements affecting lifting force

It is worth knowing that the magnet holding will differ influenced by the following factors, in order of importance:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Fragile material

Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Do not drill into magnets

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

Pinching danger

Mind your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Handling guide

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and use protective gear.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Threat to electronics

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Danger to the youngest

Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are tragic.

Threat to navigation

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

Heat warning

Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

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