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MW 25x2.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010449

GTIN/EAN: 5906301811121

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

2.5 mm [±0,1 mm]

Weight

9.2 g

Magnetization Direction

↑ axial

Load capacity

2.55 kg / 25.03 N

Magnetic Induction

121.57 mT / 1216 Gs

Coating

[NiCuNi] Nickel

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3.95 ZŁ with VAT / pcs + price for transport

3.21 ZŁ net + 23% VAT / pcs

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Technical - MW 25x2.5 / N38 - cylindrical magnet

Specification / characteristics - MW 25x2.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010449
GTIN/EAN 5906301811121
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 2.5 mm [±0,1 mm]
Weight 9.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.55 kg / 25.03 N
Magnetic Induction ~ ? 121.57 mT / 1216 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x2.5 / 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

Engineering analysis of the product - technical parameters

These information are the outcome of a physical analysis. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - characteristics
MW 25x2.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1216 Gs
121.6 mT
 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
 strong
1 mm 1177 Gs
117.7 mT
 2.39 kg / 5.27 pounds
2391.6 g / 23.5 N
 strong
2 mm 1121 Gs
112.1 mT
 2.17 kg / 4.78 pounds
2166.6 g / 21.3 N
 strong
3 mm 1050 Gs
105.0 mT
 1.90 kg / 4.19 pounds
1902.7 g / 18.7 N
 safe
5 mm 887 Gs
88.7 mT
 1.36 kg / 2.99 pounds
1358.4 g / 13.3 N
 safe
10 mm 511 Gs
51.1 mT
 0.45 kg / 0.99 pounds
450.5 g / 4.4 N
 safe
15 mm 282 Gs
28.2 mT
 0.14 kg / 0.30 pounds
137.4 g / 1.3 N
 safe
20 mm 162 Gs
16.2 mT
 0.05 kg / 0.10 pounds
45.4 g / 0.4 N
 safe
30 mm 64 Gs
6.4 mT
 0.01 kg / 0.02 pounds
7.0 g / 0.1 N
 safe
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 safe
Grip strength decreases significantly per each millimeter of spacing. Note that even a microscopic distance (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnets hold strongest in perfect adhesion; gap drastically cuts the power. Analyze how rapidly the parameters drop, when the magnet does not adhere directly to the steel surface. When planning the assembly, discard additional spacers.

Table 2: Slippage hold (wall)
MW 25x2.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
1 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.43 kg / 0.96 pounds
434.0 g / 4.3 N
3 mm Stal (~0.2) 0.38 kg / 0.84 pounds
380.0 g / 3.7 N
5 mm Stal (~0.2) 0.27 kg / 0.60 pounds
272.0 g / 2.7 N
10 mm Stal (~0.2) 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
15 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the theoretical holding capacity sufficient to cause the slippage of the magnet vertically on a vertical steel plate (considering standard friction coefficient). This parameter varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 25x2.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.76 kg / 1.69 pounds
765.0 g / 7.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 pounds
510.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.26 kg / 0.56 pounds
255.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.28 kg / 2.81 pounds
1275.0 g / 12.5 N
When placing a magnet on a vertical plane (e.g., a board), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip mean that magnets slide down faster than they pull off. Designing a vertical fastening? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller weight. Using a rubber layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 25x2.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.26 kg / 0.56 pounds
255.0 g / 2.5 N
1 mm
25%
 0.64 kg / 1.41 pounds
637.5 g / 6.3 N
2 mm
50%
 1.28 kg / 2.81 pounds
1275.0 g / 12.5 N
3 mm
75%
 1.91 kg / 4.22 pounds
1912.5 g / 18.8 N
5 mm
100%
 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
10 mm
100%
 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
11 mm
100%
 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
12 mm
100%
 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
A thin sheet is not enough to focus the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation effect means that on thin elements (e.g., car bodies), the product shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - power drop
MW 25x2.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.55 kg / 5.62 pounds
2550.0 g / 25.0 N
 OK
40 °C -2.2% 2.49 kg / 5.50 pounds
2493.9 g / 24.5 N
 OK
60 °C -4.4% 2.44 kg / 5.37 pounds
2437.8 g / 23.9 N
80 °C -6.6% 2.38 kg / 5.25 pounds
2381.7 g / 23.4 N
100 °C -28.8% 1.82 kg / 4.00 pounds
1815.6 g / 17.8 N
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Protect against heat – heat can irreversibly damage this product. With every degree above norm, the magnet's power temporarily decreases. Refrain from using this magnet in hot environments exceeding its working range. Too high temperature will lead to destruction of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 25x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.47 kg / 9.86 pounds
2 302 Gs
0.67 kg / 1.48 pounds
671 g / 6.6 N
 N/A
1 mm 4.35 kg / 9.59 pounds
2 398 Gs
0.65 kg / 1.44 pounds
653 g / 6.4 N
 3.92 kg / 8.63 pounds
~0 Gs
2 mm 4.19 kg / 9.25 pounds
2 355 Gs
0.63 kg / 1.39 pounds
629 g / 6.2 N
 3.77 kg / 8.32 pounds
~0 Gs
3 mm 4.01 kg / 8.84 pounds
2 302 Gs
0.60 kg / 1.33 pounds
601 g / 5.9 N
 3.61 kg / 7.95 pounds
~0 Gs
5 mm 3.57 kg / 7.88 pounds
2 173 Gs
0.54 kg / 1.18 pounds
536 g / 5.3 N
 3.22 kg / 7.09 pounds
~0 Gs
10 mm 2.38 kg / 5.25 pounds
1 775 Gs
0.36 kg / 0.79 pounds
357 g / 3.5 N
 2.14 kg / 4.73 pounds
~0 Gs
20 mm 0.79 kg / 1.74 pounds
1 022 Gs
0.12 kg / 0.26 pounds
119 g / 1.2 N
 0.71 kg / 1.57 pounds
~0 Gs
50 mm 0.03 kg / 0.07 pounds
198 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
127 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
86 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
61 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
44 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
33 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Figures demonstrate shear force of two same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
MW 25x2.5 / 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
Remote 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) 1.0 cm
A strong magnetic field poses a serious hazard to IT equipment as well as medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 25x2.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.55 km/h
(5.15 m/s)
 0.12 J
30 mm 29.13 km/h
(8.09 m/s)
 0.30 J
50 mm 37.55 km/h
(10.43 m/s)
 0.50 J
100 mm 53.10 km/h
(14.75 m/s)
 1.00 J
Magnetic elements are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Corrosion resistance
MW 25x2.5 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 25x2.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 7 872 Mx 78.7 µWb
Pc Coefficient 0.16 Low (Flat)
Flux value passing through the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 25x2.5 / N38

Environment Effective steel pull Effect
Air (land) 2.55 kg Standard
Water (riverbed) 2.92 kg
(+0.37 kg buoyancy gain)
+14.5%
Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.16

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%
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: 010449-2026
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This product is an incredibly powerful cylinder magnet, produced from modern NdFeB material, which, at dimensions of Ø25x2.5 mm, guarantees maximum efficiency. The MW 25x2.5 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.55 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 25.03 N with a weight of only 9.2 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 25.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø25x2.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 25 mm and height 2.5 mm. The value of 25.03 N means that the magnet is capable of holding a weight many times exceeding its own mass of 9.2 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 2.5 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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.

Pros as well as cons of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose strength, even after around ten years – the drop in strength is only ~1% (theoretically),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the option of accurate shaping and adaptation to individualized requirements, magnetic components can be produced in a wide range of geometric configurations, which increases their versatility,
  • Versatile presence in advanced technology sectors – they are utilized in computer drives, brushless drives, precision medical tools, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 resistant to moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The load parameter shown represents the maximum value, recorded under laboratory conditions, specifically:
  • using a plate made of high-permeability steel, functioning as a circuit closing element
  • with a thickness no less than 10 mm
  • with an ground touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

What influences lifting capacity in practice

Real force is influenced by specific conditions, such as (from most important):
  • Distance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Danger to pacemakers

Individuals with a heart stimulator should keep an large gap from magnets. The magnetism can stop the functioning of the implant.

Maximum temperature

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, cease handling magnets and use protective gear.

Electronic devices

Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Eye protection

Neodymium magnets are ceramic materials, meaning they are very brittle. Impact of two magnets will cause them breaking into small pieces.

GPS Danger

An intense magnetic field interferes with the operation of magnetometers in phones and navigation systems. Keep magnets close to a device to prevent damaging the sensors.

Bone fractures

Big blocks can crush fingers instantly. Never place your hand betwixt two strong magnets.

Handling rules

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Keep away from children

NdFeB magnets are not toys. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Combustion hazard

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Warning! Want to know more? Check our post: Are neodymium magnets dangerous?