Neodymium magnets – strongest on the market

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Magnet fishing: solid F200/F400 sets

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Proven solutions for fixing without drilling. Threaded mounts (external or internal) guarantee quick improvement of work on production halls. They are indispensable mounting lamps, detectors and banners.

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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

0.713 with VAT / pcs + price for transport

0.580 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical of the product - 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 analysis of the magnet - technical parameters

These information are the result of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Operational parameters may differ. Use these calculations as a preliminary roadmap during assembly planning.

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

Table 2: Slippage load (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

Table 3: Vertical assembly (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

Table 4: Material efficiency (substrate influence) - sheet metal selection
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

Table 5: Working in heat (material behavior) - 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

Table 6: Two magnets (attraction) - forces in the system
MPL 25x2x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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

Table 7: Safety (HSE) (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
Mobile device 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

Table 8: Dynamics (cracking risk) - warning
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

Table 9: Coating parameters (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)

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)

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely limits the holding force.

3. Thermal stability

*For standard magnets, the safety 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.

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%
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
Measurement Calculator
Magnet pull force

Magnetic Induction

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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 premium class connection. 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.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 2.33 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 wind generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x2x6 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 roughen and wash 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. 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. 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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose strength, even during nearly 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • In other words, due to the metallic surface of gold, the element gains visual value,
  • Magnetic induction on the top side of the magnet remains impressive,
  • 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 modularity in forming and the capacity to adapt to complex applications,
  • Significant place in future technologies – they are used in hard drives, electric drive systems, advanced medical instruments, as well as modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets: tips and applications.
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat affects it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ground touching surface
  • without any insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Key elements affecting lifting force

Bear in mind that the application force will differ influenced by the following factors, starting with the most relevant:
  • Gap (between the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
GPS Danger

An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Physical harm

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Protect data

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Fire warning

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Maximum temperature

Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Powerful field

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and respect their power.

Medical implants

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

No play value

Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Warning! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98