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MW 25x12 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010502

GTIN/EAN: 5906301814986

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

44.18 g

Magnetization Direction

↑ axial

Load capacity

19.60 kg / 192.25 N

Magnetic Induction

429.18 mT / 4292 Gs

Coating

[NiCuNi] Nickel

technical specifications »

16.64 ZŁ with VAT / pcs + price for transport

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Technical details - MW 25x12 / N38 - cylindrical magnet

Specification / characteristics - MW 25x12 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010502
GTIN/EAN 5906301814986
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 25 mm [±0,1 mm]
Height 12 mm [±0,1 mm]
Weight 44.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.60 kg / 192.25 N
Magnetic Induction ~ ? 429.18 mT / 4292 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x12 / N38 - cylindrical 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 analysis of the magnet - report

These data constitute the result of a engineering analysis. Values rely on models for the class Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - characteristics
MW 25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4291 Gs
429.1 mT
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
 critical level
1 mm 3975 Gs
397.5 mT
 16.82 kg / 37.08 pounds
16820.5 g / 165.0 N
 critical level
2 mm 3645 Gs
364.5 mT
 14.15 kg / 31.19 pounds
14147.5 g / 138.8 N
 critical level
3 mm 3316 Gs
331.6 mT
 11.71 kg / 25.81 pounds
11707.5 g / 114.9 N
 critical level
5 mm 2692 Gs
269.2 mT
 7.72 kg / 17.02 pounds
7718.0 g / 75.7 N
 warning
10 mm 1518 Gs
151.8 mT
 2.45 kg / 5.41 pounds
2451.8 g / 24.1 N
 warning
15 mm 863 Gs
86.3 mT
 0.79 kg / 1.75 pounds
793.5 g / 7.8 N
 safe
20 mm 517 Gs
51.7 mT
 0.29 kg / 0.63 pounds
285.1 g / 2.8 N
 safe
30 mm 219 Gs
21.9 mT
 0.05 kg / 0.11 pounds
51.2 g / 0.5 N
 safe
50 mm 63 Gs
6.3 mT
 0.00 kg / 0.01 pounds
4.2 g / 0.0 N
 safe
Grip strength drops sharply per each millimeter of spacing. Note that even a very thin break (e.g., contamination, varnish, dust) noticeably weakens the grip. Neodymiums work strongest in perfect adhesion; distance drastically cuts the power. See how quickly the load capacity fall, when the magnet does not touch directly to the metal substrate. When calculating the arrangement, eliminate additional spacers.

Table 2: Shear capacity (wall)
MW 25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.92 kg / 8.64 pounds
3920.0 g / 38.5 N
1 mm Stal (~0.2) 3.36 kg / 7.42 pounds
3364.0 g / 33.0 N
2 mm Stal (~0.2) 2.83 kg / 6.24 pounds
2830.0 g / 27.8 N
3 mm Stal (~0.2) 2.34 kg / 5.16 pounds
2342.0 g / 23.0 N
5 mm Stal (~0.2) 1.54 kg / 3.40 pounds
1544.0 g / 15.1 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.16 kg / 0.35 pounds
158.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below shows the approximate weight limit required to initiate the shifting of the magnet vertically along a upright metal surface (assuming typical friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.88 kg / 12.96 pounds
5880.0 g / 57.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.92 kg / 8.64 pounds
3920.0 g / 38.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.96 kg / 4.32 pounds
1960.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.80 kg / 21.61 pounds
9800.0 g / 96.1 N
When mounting a magnet on a upright surface (e.g., a board), it will only hold just approx. 20%-30% of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that magnets slide down easier than they pull off. Planning a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a noticeably lighter weight. Using a rubber layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.16 pounds
980.0 g / 9.6 N
1 mm
13%
 2.45 kg / 5.40 pounds
2450.0 g / 24.0 N
2 mm
25%
 4.90 kg / 10.80 pounds
4900.0 g / 48.1 N
3 mm
38%
 7.35 kg / 16.20 pounds
7350.0 g / 72.1 N
5 mm
63%
 12.25 kg / 27.01 pounds
12250.0 g / 120.2 N
10 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
11 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
12 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
A too thin steel is not enough to absorb the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of steel. The saturation effect causes that on thin elements (e.g., appliance housings), the product holds weaker. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
MW 25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
 OK
40 °C -2.2% 19.17 kg / 42.26 pounds
19168.8 g / 188.0 N
 OK
60 °C -4.4% 18.74 kg / 41.31 pounds
18737.6 g / 183.8 N
80 °C -6.6% 18.31 kg / 40.36 pounds
18306.4 g / 179.6 N
100 °C -28.8% 13.96 kg / 30.77 pounds
13955.2 g / 136.9 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently demagnetize this product. As the temperature rises, the neodymium's capacity briefly drops. Do not use this product close to heaters higher than its working range. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 55.71 kg / 122.82 pounds
5 494 Gs
8.36 kg / 18.42 pounds
8357 g / 82.0 N
 N/A
1 mm 51.78 kg / 114.14 pounds
8 273 Gs
7.77 kg / 17.12 pounds
7766 g / 76.2 N
 46.60 kg / 102.73 pounds
~0 Gs
2 mm 47.81 kg / 105.40 pounds
7 949 Gs
7.17 kg / 15.81 pounds
7172 g / 70.4 N
 43.03 kg / 94.86 pounds
~0 Gs
3 mm 43.94 kg / 96.88 pounds
7 621 Gs
6.59 kg / 14.53 pounds
6592 g / 64.7 N
 39.55 kg / 87.19 pounds
~0 Gs
5 mm 36.65 kg / 80.80 pounds
6 960 Gs
5.50 kg / 12.12 pounds
5497 g / 53.9 N
 32.98 kg / 72.72 pounds
~0 Gs
10 mm 21.94 kg / 48.36 pounds
5 385 Gs
3.29 kg / 7.25 pounds
3291 g / 32.3 N
 19.74 kg / 43.53 pounds
~0 Gs
20 mm 6.97 kg / 15.36 pounds
3 035 Gs
1.05 kg / 2.30 pounds
1045 g / 10.3 N
 6.27 kg / 13.83 pounds
~0 Gs
50 mm 0.33 kg / 0.72 pounds
657 Gs
0.05 kg / 0.11 pounds
49 g / 0.5 N
 0.29 kg / 0.65 pounds
~0 Gs
60 mm 0.15 kg / 0.32 pounds
439 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
70 mm 0.07 kg / 0.16 pounds
306 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
80 mm 0.04 kg / 0.08 pounds
221 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.05 pounds
165 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
126 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the pinch force is huge. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Figures show friction force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MW 25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 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 electronics and pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.84 km/h
(6.35 m/s)
 0.89 J
30 mm 36.85 km/h
(10.24 m/s)
 2.31 J
50 mm 47.51 km/h
(13.20 m/s)
 3.85 J
100 mm 67.17 km/h
(18.66 m/s)
 7.69 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MW 25x12 / 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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MW 25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 413 Mx 214.1 µWb
Pc Coefficient 0.57 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 25x12 / N38

Environment Effective steel pull Effect
Air (land) 19.60 kg Standard
Water (riverbed) 22.44 kg
(+2.84 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.57

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 and environmental data
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: 010502-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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The offered product is an extremely powerful cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø25x12 mm, guarantees the highest energy density. The MW 25x12 / N38 model boasts high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 19.60 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 192.25 N with a weight of only 44.18 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø25x12), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 25 mm and height 12 mm. The key parameter here is the lifting capacity amounting to approximately 19.60 kg (force ~192.25 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 25 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • Their power is durable, and after around 10 years it decreases only by ~1% (theoretically),
  • Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by external magnetic fields,
  • A magnet with a shiny silver surface has better aesthetics,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • 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...
  • Possibility of custom creating and optimizing to atypical requirements,
  • Universal use in high-tech industry – they are used in HDD drives, brushless drives, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Highest magnetic holding force – what affects it?

The lifting capacity listed is a measurement result executed under standard conditions:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth touching surface
  • without any clearance between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at ambient temperature room level

What influences lifting capacity in practice

Effective lifting capacity is affected by working environment parameters, mainly (from priority):
  • Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Angle of force application – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Bone fractures

Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Be careful!

Threat to electronics

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Powerful field

Handle magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.

Health Danger

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Material brittleness

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

Precision electronics

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

Allergic reactions

It is widely known that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from direct skin contact or opt for encased magnets.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

No play value

Always keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Machining danger

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Safety First! Want to know more? Check our post: Why are neodymium magnets dangerous?