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MPL 25x2x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020509

length

25 mm [±0,1 mm]

Width

2 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

2.25 g

Magnetization Direction

↑ axial

Load capacity

2.33 kg / 22.82 N

Magnetic Induction

558.90 mT / 5589 Gs

Coating

[NiCuNi] Nickel

see parameters »

0.713 ZŁ with VAT / pcs + price for transport

0.580 ZŁ net + 23% VAT / pcs

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Strength along with appearance of a neodymium magnet can be verified with our force calculator.

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Product card - MPL 25x2x6 / N38 - lamellar magnet

Specification / characteristics - MPL 25x2x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020509
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 2 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 2.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.82 N
Magnetic Induction ~ ? 558.90 mT / 5589 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x2x6 / 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

Engineering modeling of the assembly - report

These data constitute the result of a physical analysis. Values rely on algorithms for the class Nd2Fe14B. Operational parameters may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MPL 25x2x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5574 Gs
557.4 mT
 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
 strong
1 mm 2599 Gs
259.9 mT
 0.51 kg / 1.12 LBS
506.6 g / 5.0 N
 safe
2 mm 1392 Gs
139.2 mT
 0.15 kg / 0.32 LBS
145.3 g / 1.4 N
 safe
3 mm 879 Gs
87.9 mT
 0.06 kg / 0.13 LBS
58.0 g / 0.6 N
 safe
5 mm 454 Gs
45.4 mT
 0.02 kg / 0.03 LBS
15.5 g / 0.2 N
 safe
10 mm 155 Gs
15.5 mT
 0.00 kg / 0.00 LBS
1.8 g / 0.0 N
 safe
15 mm 72 Gs
7.2 mT
 0.00 kg / 0.00 LBS
0.4 g / 0.0 N
 safe
20 mm 39 Gs
3.9 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 safe
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Pulling power drops sharply per each millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, varnish, veneer) noticeably weakens the grip. Magnets hold optimally at the point of direct contact; air break kills the force. See how rapidly the parameters plummet, when the product does not touch flatly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

Table 2: Vertical force (vertical surface)
MPL 25x2x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 LBS
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.10 kg / 0.22 LBS
102.0 g / 1.0 N
2 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
3 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data calculates the theoretical weight limit needed to cause the sliding of the magnet downwards against a upright metal surface (considering typical friction coefficient). This parameter depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 25x2x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 LBS
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 LBS
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 LBS
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 LBS
1165.0 g / 11.4 N
When placing a magnet on a vertical surface (e.g., a board), it you can count on just approx. 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that holders slide down easier than they detach. Want to create a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter cargo. Utilizing a rubberized layer can effectively improve the result.

Table 4: Steel thickness (saturation) - power losses
MPL 25x2x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.23 kg / 0.51 LBS
233.0 g / 2.3 N
1 mm
25%
 0.58 kg / 1.28 LBS
582.5 g / 5.7 N
2 mm
50%
 1.17 kg / 2.57 LBS
1165.0 g / 11.4 N
3 mm
75%
 1.75 kg / 3.85 LBS
1747.5 g / 17.1 N
5 mm
100%
 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
10 mm
100%
 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
11 mm
100%
 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
12 mm
100%
 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
A too thin steel is not enough to conduct the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To achieve the maximum of this neodymium's potential, you need a suitably thick piece of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the holder holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MPL 25x2x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 LBS
2330.0 g / 22.9 N
 OK
40 °C -2.2% 2.28 kg / 5.02 LBS
2278.7 g / 22.4 N
 OK
60 °C -4.4% 2.23 kg / 4.91 LBS
2227.5 g / 21.9 N
 OK
80 °C -6.6% 2.18 kg / 4.80 LBS
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 LBS
1659.0 g / 16.3 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – high temperature can permanently damage this magnet. As the temperature rises, the neodymium's force temporarily lowers. Do not use this magnet close to ovens exceeding its working range. Too high temperature will lead to permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 25x2x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.58 kg / 21.12 LBS
5 924 Gs
1.44 kg / 3.17 LBS
1437 g / 14.1 N
 N/A
1 mm 4.52 kg / 9.97 LBS
7 659 Gs
0.68 kg / 1.49 LBS
678 g / 6.7 N
 4.07 kg / 8.97 LBS
~0 Gs
2 mm 2.08 kg / 4.59 LBS
5 198 Gs
0.31 kg / 0.69 LBS
312 g / 3.1 N
 1.87 kg / 4.13 LBS
~0 Gs
3 mm 1.06 kg / 2.34 LBS
3 708 Gs
0.16 kg / 0.35 LBS
159 g / 1.6 N
 0.95 kg / 2.10 LBS
~0 Gs
5 mm 0.37 kg / 0.81 LBS
2 179 Gs
0.05 kg / 0.12 LBS
55 g / 0.5 N
 0.33 kg / 0.73 LBS
~0 Gs
10 mm 0.06 kg / 0.14 LBS
909 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.13 LBS
~0 Gs
20 mm 0.01 kg / 0.02 LBS
311 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
46 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
29 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
20 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
14 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
10 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
8 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a much further distance than a magnet and steel combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still large.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Figures show shear force of dual identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MPL 25x2x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field is a serious hazard to electronics and pacemakers. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 25x2x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 32.47 km/h
(9.02 m/s)
 0.09 J
30 mm 56.21 km/h
(15.61 m/s)
 0.27 J
50 mm 72.57 km/h
(20.16 m/s)
 0.46 J
100 mm 102.63 km/h
(28.51 m/s)
 0.91 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to fingers. 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 neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MPL 25x2x6 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 25x2x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 608 Mx 26.1 µWb
Pc Coefficient 0.76 High (Stable)
Flux value emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Submerged application
MPL 25x2x6 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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 surface, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens 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) = 0.76

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 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.

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%
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: 020509-2026
Quick Unit Converter
Force (pull)
Field Strength
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Component MPL 25x2x6 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 22.82 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. To separate the MPL 25x2x6 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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 25x2x6 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 2.33 kg), they are ideal as hidden locks 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 25x2x6 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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).
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 (25x2 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 25x2x6 mm, which, at a weight of 2.25 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 2.33 kg (force ~22.82 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets very well defend themselves against demagnetization caused by foreign field sources,
  • By covering with a decorative layer of silver, the element has an modern look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of accurate machining as well as optimizing to individual requirements,
  • Fundamental importance in modern industrial fields – they are commonly used in data components, electric drive systems, diagnostic systems, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these magnets can disrupt the diagnostic process 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

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The force parameter is a measurement result performed under specific, ideal conditions:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

In real-world applications, the actual lifting capacity is determined by several key aspects, listed from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and holding force.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings
Implant safety

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

Permanent damage

Avoid heat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Dust is flammable

Machining of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Safe operation

Exercise caution. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can move away.

No play value

NdFeB magnets are not intended for children. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

Shattering risk

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Phone sensors

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Cards and drives

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Warning for allergy sufferers

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.

Crushing force

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

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