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MPL 25x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020135

GTIN/EAN: 5906301811411

5.00

length

25 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

9.38 g

Magnetization Direction

↑ axial

Load capacity

7.49 kg / 73.45 N

Magnetic Induction

337.05 mT / 3371 Gs

Coating

[NiCuNi] Nickel

4.66 with VAT / pcs + price for transport

3.79 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical details - MPL 25x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 25x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020135
GTIN/EAN 5906301811411
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 5 mm [±0,1 mm]
Weight 9.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.49 kg / 73.45 N
Magnetic Induction ~ ? 337.05 mT / 3371 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x10x5 / 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 product - report

Presented data constitute the result of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 25x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3369 Gs
336.9 mT
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
strong
1 mm 2932 Gs
293.2 mT
5.67 kg / 12.51 pounds
5673.2 g / 55.7 N
strong
2 mm 2479 Gs
247.9 mT
4.06 kg / 8.94 pounds
4056.9 g / 39.8 N
strong
3 mm 2065 Gs
206.5 mT
2.81 kg / 6.21 pounds
2814.7 g / 27.6 N
strong
5 mm 1419 Gs
141.9 mT
1.33 kg / 2.93 pounds
1328.6 g / 13.0 N
safe
10 mm 603 Gs
60.3 mT
0.24 kg / 0.53 pounds
240.3 g / 2.4 N
safe
15 mm 296 Gs
29.6 mT
0.06 kg / 0.13 pounds
57.8 g / 0.6 N
safe
20 mm 162 Gs
16.2 mT
0.02 kg / 0.04 pounds
17.4 g / 0.2 N
safe
30 mm 62 Gs
6.2 mT
0.00 kg / 0.01 pounds
2.5 g / 0.0 N
safe
50 mm 16 Gs
1.6 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
safe

Table 2: Sliding capacity (vertical surface)
MPL 25x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.30 pounds
1498.0 g / 14.7 N
1 mm Stal (~0.2) 1.13 kg / 2.50 pounds
1134.0 g / 11.1 N
2 mm Stal (~0.2) 0.81 kg / 1.79 pounds
812.0 g / 8.0 N
3 mm Stal (~0.2) 0.56 kg / 1.24 pounds
562.0 g / 5.5 N
5 mm Stal (~0.2) 0.27 kg / 0.59 pounds
266.0 g / 2.6 N
10 mm Stal (~0.2) 0.05 kg / 0.11 pounds
48.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 25x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.25 kg / 4.95 pounds
2247.0 g / 22.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.30 pounds
1498.0 g / 14.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.65 pounds
749.0 g / 7.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.75 kg / 8.26 pounds
3745.0 g / 36.7 N

Table 4: Steel thickness (saturation) - power losses
MPL 25x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.75 kg / 1.65 pounds
749.0 g / 7.3 N
1 mm
25%
1.87 kg / 4.13 pounds
1872.5 g / 18.4 N
2 mm
50%
3.75 kg / 8.26 pounds
3745.0 g / 36.7 N
3 mm
75%
5.62 kg / 12.38 pounds
5617.5 g / 55.1 N
5 mm
100%
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
10 mm
100%
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
11 mm
100%
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
12 mm
100%
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N

Table 5: Thermal stability (stability) - thermal limit
MPL 25x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
OK
40 °C -2.2% 7.33 kg / 16.15 pounds
7325.2 g / 71.9 N
OK
60 °C -4.4% 7.16 kg / 15.79 pounds
7160.4 g / 70.2 N
80 °C -6.6% 7.00 kg / 15.42 pounds
6995.7 g / 68.6 N
100 °C -28.8% 5.33 kg / 11.76 pounds
5332.9 g / 52.3 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 25x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.49 kg / 38.57 pounds
4 785 Gs
2.62 kg / 5.78 pounds
2624 g / 25.7 N
N/A
1 mm 15.37 kg / 33.89 pounds
6 316 Gs
2.31 kg / 5.08 pounds
2306 g / 22.6 N
13.84 kg / 30.50 pounds
~0 Gs
2 mm 13.25 kg / 29.21 pounds
5 864 Gs
1.99 kg / 4.38 pounds
1987 g / 19.5 N
11.92 kg / 26.29 pounds
~0 Gs
3 mm 11.26 kg / 24.83 pounds
5 407 Gs
1.69 kg / 3.72 pounds
1690 g / 16.6 N
10.14 kg / 22.35 pounds
~0 Gs
5 mm 7.91 kg / 17.44 pounds
4 531 Gs
1.19 kg / 2.62 pounds
1187 g / 11.6 N
7.12 kg / 15.70 pounds
~0 Gs
10 mm 3.10 kg / 6.84 pounds
2 838 Gs
0.47 kg / 1.03 pounds
465 g / 4.6 N
2.79 kg / 6.16 pounds
~0 Gs
20 mm 0.56 kg / 1.24 pounds
1 207 Gs
0.08 kg / 0.19 pounds
84 g / 0.8 N
0.51 kg / 1.11 pounds
~0 Gs
50 mm 0.01 kg / 0.03 pounds
194 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
124 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.01 pounds
84 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
59 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
43 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
32 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MPL 25x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Collisions (cracking risk) - warning
MPL 25x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.06 km/h
(8.07 m/s)
0.31 J
30 mm 49.37 km/h
(13.71 m/s)
0.88 J
50 mm 63.73 km/h
(17.70 m/s)
1.47 J
100 mm 90.12 km/h
(25.03 m/s)
2.94 J

Table 9: Surface protection spec
MPL 25x10x5 / 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)

Table 10: Construction data (Pc)
MPL 25x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 245 Mx 82.5 µWb
Pc Coefficient 0.38 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 25x10x5 / N38

Environment Effective steel pull Effect
Air (land) 7.49 kg Standard
Water (riverbed) 8.58 kg
(+1.09 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

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

2. Steel saturation

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

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

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.

Engineering data and GPSR
Chemical composition
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: 020135-2026
Magnet Unit Converter
Magnet pull force

Field Strength

Other proposals

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 25x10x5 mm and a weight of 9.38 g, guarantees the highest quality connection. This rectangular block with a force of 73.45 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 7.49 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.
Plate magnets MPL 25x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization 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. 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. 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 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 7.49 kg (force ~73.45 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • Their power is maintained, and after around 10 years it drops only by ~1% (according to research),
  • Magnets perfectly protect themselves against loss of magnetization caused by ambient magnetic noise,
  • By covering with a shiny layer of silver, the element has an aesthetic look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the ability of precise forming and adaptation to individualized solutions, magnetic components can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
  • Fundamental importance in innovative solutions – they are commonly used in HDD drives, electric drive systems, diagnostic systems, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic holder.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets can complicate diagnosis 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

Optimal lifting capacity of a neodymium magnetwhat affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
  • using a base made of low-carbon steel, serving as a circuit closing element
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • with zero gap (without coatings)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

In real-world applications, the real power is determined by a number of factors, listed from crucial:
  • Distance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Fire risk

Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Keep away from electronics

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.

Permanent damage

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and strength.

Nickel coating and allergies

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease working with magnets and use protective gear.

ICD Warning

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Electronic hazard

Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Material brittleness

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Conscious usage

Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and respect their force.

Bone fractures

Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

No play value

Product intended for adults. Small elements pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Warning! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98