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MPL 25x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020137

GTIN/EAN: 5906301811435

5.00

length

25 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

46.88 g

Magnetization Direction

↑ axial

Load capacity

19.39 kg / 190.25 N

Magnetic Induction

361.04 mT / 3610 Gs

Coating

[NiCuNi] Nickel

check properties »

20.29 ZŁ with VAT / pcs + price for transport

16.50 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 25x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020137
GTIN/EAN 5906301811435
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 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 46.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.39 kg / 190.25 N
Magnetic Induction ~ ? 361.04 mT / 3610 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x25x10 / 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 simulation of the assembly - report

Presented values are the outcome of a engineering analysis. Results were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 25x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3610 Gs
361.0 mT
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
 dangerous!
1 mm 3392 Gs
339.2 mT
 17.12 kg / 37.74 LBS
17117.7 g / 167.9 N
 dangerous!
2 mm 3156 Gs
315.6 mT
 14.82 kg / 32.68 LBS
14822.5 g / 145.4 N
 dangerous!
3 mm 2913 Gs
291.3 mT
 12.63 kg / 27.85 LBS
12631.8 g / 123.9 N
 dangerous!
5 mm 2436 Gs
243.6 mT
 8.83 kg / 19.46 LBS
8827.9 g / 86.6 N
 warning
10 mm 1464 Gs
146.4 mT
 3.19 kg / 7.04 LBS
3191.5 g / 31.3 N
 warning
15 mm 872 Gs
87.2 mT
 1.13 kg / 2.49 LBS
1131.5 g / 11.1 N
 weak grip
20 mm 538 Gs
53.8 mT
 0.43 kg / 0.95 LBS
430.4 g / 4.2 N
 weak grip
30 mm 234 Gs
23.4 mT
 0.08 kg / 0.18 LBS
81.8 g / 0.8 N
 weak grip
50 mm 68 Gs
6.8 mT
 0.01 kg / 0.02 LBS
6.9 g / 0.1 N
 weak grip
Pulling power decreases sharply with every mm of spacing. Note that every additional insulation layer (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products operate most effectively during direct contact; gap nullifies the power. Notice how rapidly the pull force fall, when the magnet does not adhere tightly to the steel surface. When planning the assembly, avoid additional spacers.

Table 2: Vertical force (vertical surface)
MPL 25x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
1 mm Stal (~0.2) 3.42 kg / 7.55 LBS
3424.0 g / 33.6 N
2 mm Stal (~0.2) 2.96 kg / 6.53 LBS
2964.0 g / 29.1 N
3 mm Stal (~0.2) 2.53 kg / 5.57 LBS
2526.0 g / 24.8 N
5 mm Stal (~0.2) 1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
10 mm Stal (~0.2) 0.64 kg / 1.41 LBS
638.0 g / 6.3 N
15 mm Stal (~0.2) 0.23 kg / 0.50 LBS
226.0 g / 2.2 N
20 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The following data defines the approximate force required to initiate the slippage of the magnet down along a upright steel plate (assuming standard friction coefficient). This value is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 25x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.82 kg / 12.82 LBS
5817.0 g / 57.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.94 kg / 4.27 LBS
1939.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.70 kg / 21.37 LBS
9695.0 g / 95.1 N
When hanging a magnet on a upright surface (e.g., a car body), it will maintain only about 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that holders move down easier than they pull off. Designing a wall mount? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slide down under a noticeably lighter weight. Application of an anti-slip pad can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MPL 25x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.97 kg / 2.14 LBS
969.5 g / 9.5 N
1 mm
13%
 2.42 kg / 5.34 LBS
2423.8 g / 23.8 N
2 mm
25%
 4.85 kg / 10.69 LBS
4847.5 g / 47.6 N
3 mm
38%
 7.27 kg / 16.03 LBS
7271.3 g / 71.3 N
5 mm
63%
 12.12 kg / 26.72 LBS
12118.8 g / 118.9 N
10 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
11 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
12 mm
100%
 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
A thin sheet cannot absorb the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MPL 25x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
 OK
40 °C -2.2% 18.96 kg / 41.81 LBS
18963.4 g / 186.0 N
 OK
60 °C -4.4% 18.54 kg / 40.87 LBS
18536.8 g / 181.8 N
80 °C -6.6% 18.11 kg / 39.93 LBS
18110.3 g / 177.7 N
100 °C -28.8% 13.81 kg / 30.44 LBS
13805.7 g / 135.4 N
Classic neodymiums change their properties power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly destroy this product. With increasing heat, the neodymium's power temporarily drops. Refrain from using this magnet close to ovens exceeding its safe range. Too high temperature will result in 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 at lower temperatures than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 25x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.20 kg / 110.68 LBS
5 073 Gs
7.53 kg / 16.60 LBS
7531 g / 73.9 N
 N/A
1 mm 47.31 kg / 104.30 LBS
7 008 Gs
7.10 kg / 15.65 LBS
7097 g / 69.6 N
 42.58 kg / 93.87 LBS
~0 Gs
2 mm 44.32 kg / 97.71 LBS
6 783 Gs
6.65 kg / 14.66 LBS
6648 g / 65.2 N
 39.89 kg / 87.94 LBS
~0 Gs
3 mm 41.33 kg / 91.12 LBS
6 550 Gs
6.20 kg / 13.67 LBS
6200 g / 60.8 N
 37.20 kg / 82.01 LBS
~0 Gs
5 mm 35.49 kg / 78.25 LBS
6 070 Gs
5.32 kg / 11.74 LBS
5324 g / 52.2 N
 31.94 kg / 70.43 LBS
~0 Gs
10 mm 22.86 kg / 50.39 LBS
4 871 Gs
3.43 kg / 7.56 LBS
3429 g / 33.6 N
 20.57 kg / 45.35 LBS
~0 Gs
20 mm 8.26 kg / 18.22 LBS
2 929 Gs
1.24 kg / 2.73 LBS
1240 g / 12.2 N
 7.44 kg / 16.40 LBS
~0 Gs
50 mm 0.46 kg / 1.02 LBS
695 Gs
0.07 kg / 0.15 LBS
70 g / 0.7 N
 0.42 kg / 0.92 LBS
~0 Gs
60 mm 0.21 kg / 0.47 LBS
469 Gs
0.03 kg / 0.07 LBS
32 g / 0.3 N
 0.19 kg / 0.42 LBS
~0 Gs
70 mm 0.10 kg / 0.23 LBS
329 Gs
0.02 kg / 0.03 LBS
16 g / 0.2 N
 0.09 kg / 0.21 LBS
~0 Gs
80 mm 0.05 kg / 0.12 LBS
239 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
90 mm 0.03 kg / 0.07 LBS
178 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.06 LBS
~0 Gs
100 mm 0.02 kg / 0.04 LBS
136 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a further horizon of action. Planning to create a strong closure? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The levitation is slightly lower than the connection force, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Calculations apply to sliding force of a pair of matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
MPL 25x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a serious hazard to electronic devices and pacemakers. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 25x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.52 km/h
(6.26 m/s)
 0.92 J
30 mm 35.62 km/h
(9.89 m/s)
 2.29 J
50 mm 45.87 km/h
(12.74 m/s)
 3.81 J
100 mm 64.86 km/h
(18.02 m/s)
 7.61 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with large magnets.

Table 9: Coating parameters (durability)
MPL 25x25x10 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MPL 25x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 497 Mx 235.0 µWb
Pc Coefficient 0.46 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter when building generators and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 25x25x10 / N38

Environment Effective steel pull Effect
Air (land) 19.39 kg Standard
Water (riverbed) 22.20 kg
(+2.81 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens 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 Pc (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 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 specification and ecology
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%
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: 020137-2026
Measurement Calculator
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 25x25x10 mm and a weight of 46.88 g, guarantees the highest quality connection. As a block magnet with high power (approx. 19.39 kg), this product is available off-the-shelf from our warehouse in Poland. 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 19.39 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 19.39 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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).
Standardly, the MPL 25x25x10 / N38 model is magnetized axially (dimension 10 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 (25x25 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 25x25x10 mm, which, at a weight of 46.88 g, makes it an element with high energy density. It is a magnetic block with dimensions 25x25x10 mm and a self-weight of 46.88 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 neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for around ten years – the drop is just ~1% (based on simulations),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by external field sources,
  • Thanks to the glossy finish, the coating of nickel, gold, or silver gives an modern appearance,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • 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 freedom in constructing and the capacity to customize to specific needs,
  • Huge importance in high-tech industry – they find application in data components, electromotive mechanisms, diagnostic systems, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Highest magnetic holding force – what it depends on?

Breakaway force was determined for the most favorable conditions, including:
  • using a base made of high-permeability steel, serving as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • with an ground contact surface
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Lifting capacity in practice – influencing factors

It is worth knowing that the working load will differ subject to elements below, starting with the most relevant:
  • Distance – the presence of foreign body (rust, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Warnings
Fire risk

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Pinching danger

Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Do not overheat magnets

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Pacemakers

Individuals with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Electronic devices

Do not bring magnets near a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Do not give to children

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store away from children and animals.

Fragile material

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Compass and GPS

A strong magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.

Powerful field

Be careful. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can react.

Allergic reactions

Some people experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in a rash. We suggest wear safety gloves.

Attention! Details about hazards in the article: Safety of working with magnets.