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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

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0.713 ZŁ with VAT / pcs + price for transport

0.580 ZŁ net + 23% VAT / pcs

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Physical properties - 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 simulation of the assembly - technical parameters

These information are the outcome of a engineering analysis. Results rely on models for the material Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - 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
 warning
1 mm 2599 Gs
259.9 mT
 0.51 kg / 1.12 lbs
506.6 g / 5.0 N
 weak grip
2 mm 1392 Gs
139.2 mT
 0.15 kg / 0.32 lbs
145.3 g / 1.4 N
 weak grip
3 mm 879 Gs
87.9 mT
 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
 weak grip
5 mm 454 Gs
45.4 mT
 0.02 kg / 0.03 lbs
15.5 g / 0.2 N
 weak grip
10 mm 155 Gs
15.5 mT
 0.00 kg / 0.00 lbs
1.8 g / 0.0 N
 weak grip
15 mm 72 Gs
7.2 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 weak grip
20 mm 39 Gs
3.9 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force decreases significantly with every mm of distance. Keep in mind that every additional insulation layer (e.g., contamination, paint, dust) significantly reduces the pull force. Magnets operate most effectively in perfect adhesion; gap kills the power. Notice how rapidly the load capacity fall, when the product does not touch directly to the metal substrate. When designing the mounting, avoid redundant distances.

Table 2: Shear force (wall)
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 table below indicates the estimated weight limit required to start the slippage of the magnet down against a upright metal surface (assuming standard friction). This value varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 hanging a magnet on a upright wall (e.g., a board), it will only hold only about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip influence the fact that magnets move down easier than they pop off the substrate. Designing a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter load. Utilizing a rubberized pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - 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 weakens actual performance of the holder. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To utilize 100% of this magnet's potential, you need a suitably thick backing of steel. The saturation effect causes that on delicate walls (e.g., thin profiles), the magnet works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Working in heat (stability) - thermal limit
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
Standard neodymium magnets lose power past the thermal threshold. Watch out for overheating – heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's capacity briefly decreases. Refrain from using this product close to heaters exceeding its working range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 25x2x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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 magnetic products attract each other from a wider radius than a neodymium and metal setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of performance. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the attraction, but still significant.
*Field value between like poles drops to ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Note: Results refer to friction force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Remote 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 poses a large risk to electronics as well as medical implants. These magnets produce a field that destroys function of sensitive medical devices. Remember: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - 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
NdFeB products are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical 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 magnet pole. Essential parameter for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.76

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
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: 020509-2026
Magnet Unit Converter
Magnet pull force
Field Strength
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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 25x2x6 mm and a weight of 2.25 g, guarantees the highest quality connection. This magnetic block with a force of 22.82 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.
The key to success is sliding 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. 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. 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 generators and material handling systems. 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, it is best to use 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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (25x2 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 25x2x6 mm, which, at a weight of 2.25 g, makes it an element with high energy density. It is a magnetic block with dimensions 25x2x6 mm and a self-weight of 2.25 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • Their strength is durable, and after around ten years it drops only by ~1% (according to research),
  • They retain their magnetic properties even under strong external field,
  • Thanks to the shiny finish, the surface of nickel, gold-plated, or silver gives an elegant appearance,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of detailed forming and adapting to individual requirements,
  • Huge importance in modern industrial fields – they serve a role in HDD drives, brushless drives, precision medical tools, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

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

Magnet power is the result of a measurement for ideal contact conditions, taking into account:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction vertical to the mounting surface
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force is determined by several key aspects, presented from the most important:
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was checked 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. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safe handling of neodymium magnets
Handling guide

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

Dust explosion hazard

Dust generated during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

This is not a toy

NdFeB magnets are not intended for children. Swallowing a few magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Bone fractures

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Heat sensitivity

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Beware of splinters

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Health Danger

Patients with a pacemaker have to keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Avoid contact if allergic

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands or choose encased magnets.

Safe distance

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?