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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

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Technical parameters - 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

Physical simulation of the assembly - technical parameters

These values are the direct effect of a engineering simulation. Values are based on models for the class Nd2Fe14B. Operational performance may differ. Use these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - characteristics
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 pounds
2330.0 g / 22.9 N
warning
1 mm 2599 Gs
259.9 mT
0.51 kg / 1.12 pounds
506.6 g / 5.0 N
low risk
2 mm 1392 Gs
139.2 mT
0.15 kg / 0.32 pounds
145.3 g / 1.4 N
low risk
3 mm 879 Gs
87.9 mT
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
low risk
5 mm 454 Gs
45.4 mT
0.02 kg / 0.03 pounds
15.5 g / 0.2 N
low risk
10 mm 155 Gs
15.5 mT
0.00 kg / 0.00 pounds
1.8 g / 0.0 N
low risk
15 mm 72 Gs
7.2 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
low risk
20 mm 39 Gs
3.9 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk
30 mm 15 Gs
1.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk
50 mm 4 Gs
0.4 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

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 pounds
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.10 kg / 0.22 pounds
102.0 g / 1.0 N
2 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
3 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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) - 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 pounds
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N

Table 4: Material efficiency (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 pounds
233.0 g / 2.3 N
1 mm
25%
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
2 mm
50%
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
3 mm
75%
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
5 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
10 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
11 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
12 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N

Table 5: Thermal stability (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 pounds
2330.0 g / 22.9 N
OK
40 °C -2.2% 2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
OK
60 °C -4.4% 2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
OK
80 °C -6.6% 2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 pounds
1659.0 g / 16.3 N

Table 6: Two magnets (repulsion) - field collision
MPL 25x2x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.58 kg / 21.12 pounds
5 924 Gs
1.44 kg / 3.17 pounds
1437 g / 14.1 N
N/A
1 mm 4.52 kg / 9.97 pounds
7 659 Gs
0.68 kg / 1.49 pounds
678 g / 6.7 N
4.07 kg / 8.97 pounds
~0 Gs
2 mm 2.08 kg / 4.59 pounds
5 198 Gs
0.31 kg / 0.69 pounds
312 g / 3.1 N
1.87 kg / 4.13 pounds
~0 Gs
3 mm 1.06 kg / 2.34 pounds
3 708 Gs
0.16 kg / 0.35 pounds
159 g / 1.6 N
0.95 kg / 2.10 pounds
~0 Gs
5 mm 0.37 kg / 0.81 pounds
2 179 Gs
0.05 kg / 0.12 pounds
55 g / 0.5 N
0.33 kg / 0.73 pounds
~0 Gs
10 mm 0.06 kg / 0.14 pounds
909 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
0.06 kg / 0.13 pounds
~0 Gs
20 mm 0.01 kg / 0.02 pounds
311 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
46 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
29 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
20 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
14 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
10 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
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (implants) - 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
Mechanical watch 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: Collisions (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

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)

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)

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

*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) = 0.76

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%
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
Force (pull)

Magnetic Induction

Other deals

Component MPL 25x2x6 / N38 features a low profile and professional 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. Additionally, its Ni-Cu-Ni coating secures 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 care, 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 magnetic separators and linear motors. They work great as fasteners 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, it is best to use 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 25x2x6 / N38 model is magnetized through the thickness (dimension 6 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 (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 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 compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Pros

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They retain magnetic properties for around 10 years – the drop is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By applying a reflective layer of silver, the element has an elegant look,
  • Magnets are characterized by impressive magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in shaping and the capacity to customize to specific needs,
  • Fundamental importance in innovative solutions – they are used in mass storage devices, electric motors, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in small systems

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • 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 raises their 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.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, assuming:
  • using a sheet made of high-permeability steel, acting as a circuit closing element
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the application force will differ subject to elements below, starting with the most relevant:
  • Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, 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. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Cards and drives

Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.

Fire risk

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Keep away from electronics

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Bone fractures

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Magnet fragility

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

Pacemakers

People with a pacemaker should keep an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Swallowing risk

Always keep magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.

Power loss in heat

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

Caution required

Handle magnets with awareness. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.

Nickel allergy

A percentage of the population experience a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Prolonged contact might lead to an allergic reaction. We strongly advise wear protective gloves.

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