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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

check technical specifications »

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

Technical simulation of the assembly - report

Presented values are the result of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - power drop
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 lbs
2550.0 g / 25.0 N
 medium risk
1 mm 1177 Gs
117.7 mT
 2.39 kg / 5.27 lbs
2391.6 g / 23.5 N
 medium risk
2 mm 1121 Gs
112.1 mT
 2.17 kg / 4.78 lbs
2166.6 g / 21.3 N
 medium risk
3 mm 1050 Gs
105.0 mT
 1.90 kg / 4.19 lbs
1902.7 g / 18.7 N
 weak grip
5 mm 887 Gs
88.7 mT
 1.36 kg / 2.99 lbs
1358.4 g / 13.3 N
 weak grip
10 mm 511 Gs
51.1 mT
 0.45 kg / 0.99 lbs
450.5 g / 4.4 N
 weak grip
15 mm 282 Gs
28.2 mT
 0.14 kg / 0.30 lbs
137.4 g / 1.3 N
 weak grip
20 mm 162 Gs
16.2 mT
 0.05 kg / 0.10 lbs
45.4 g / 0.4 N
 weak grip
30 mm 64 Gs
6.4 mT
 0.01 kg / 0.02 lbs
7.0 g / 0.1 N
 weak grip
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 lbs
0.5 g / 0.0 N
 weak grip
Pulling power decreases significantly with every mm of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, veneer) strongly diminishes the holding power. Magnetic products operate strongest during direct contact; gap drastically cuts the power. Notice how flashily the load capacity plummet, when the product does not touch directly to the steel surface. When planning the mounting, discard redundant distances.

Table 2: Shear capacity (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 lbs
510.0 g / 5.0 N
1 mm Stal (~0.2) 0.48 kg / 1.05 lbs
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.43 kg / 0.96 lbs
434.0 g / 4.3 N
3 mm Stal (~0.2) 0.38 kg / 0.84 lbs
380.0 g / 3.7 N
5 mm Stal (~0.2) 0.27 kg / 0.60 lbs
272.0 g / 2.7 N
10 mm Stal (~0.2) 0.09 kg / 0.20 lbs
90.0 g / 0.9 N
15 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data shows the approximate force sufficient to initiate the shifting of the magnet down against a vertical steel wall (considering standard friction). The holding force is a function of the separation distance between the magnet and the surface.

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 lbs
765.0 g / 7.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.51 kg / 1.12 lbs
510.0 g / 5.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.26 kg / 0.56 lbs
255.0 g / 2.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.28 kg / 2.81 lbs
1275.0 g / 12.5 N
When placing a holder on a upright plane (e.g., a car body), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient influence the fact that magnets slip easier than they detach. Designing a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a significantly smaller weight. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 25x2.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.26 kg / 0.56 lbs
255.0 g / 2.5 N
1 mm
25%
 0.64 kg / 1.41 lbs
637.5 g / 6.3 N
2 mm
50%
 1.28 kg / 2.81 lbs
1275.0 g / 12.5 N
3 mm
75%
 1.91 kg / 4.22 lbs
1912.5 g / 18.8 N
5 mm
100%
 2.55 kg / 5.62 lbs
2550.0 g / 25.0 N
10 mm
100%
 2.55 kg / 5.62 lbs
2550.0 g / 25.0 N
11 mm
100%
 2.55 kg / 5.62 lbs
2550.0 g / 25.0 N
12 mm
100%
 2.55 kg / 5.62 lbs
2550.0 g / 25.0 N
A too thin steel is not enough to focus the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (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 lbs
2550.0 g / 25.0 N
 OK
40 °C -2.2% 2.49 kg / 5.50 lbs
2493.9 g / 24.5 N
 OK
60 °C -4.4% 2.44 kg / 5.37 lbs
2437.8 g / 23.9 N
80 °C -6.6% 2.38 kg / 5.25 lbs
2381.7 g / 23.4 N
100 °C -28.8% 1.82 kg / 4.00 lbs
1815.6 g / 17.8 N
Classic neodymiums change their properties strength past the thermal threshold. Avoid high temperatures – high temperature can permanently destroy this product. As the temperature rises, the neodymium's capacity briefly drops. Do not use this magnet near heat sources exceeding its working range. Ignoring the limit will result in permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 25x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.47 kg / 9.86 lbs
2 302 Gs
0.67 kg / 1.48 lbs
671 g / 6.6 N
 N/A
1 mm 4.35 kg / 9.59 lbs
2 398 Gs
0.65 kg / 1.44 lbs
653 g / 6.4 N
 3.92 kg / 8.63 lbs
~0 Gs
2 mm 4.19 kg / 9.25 lbs
2 355 Gs
0.63 kg / 1.39 lbs
629 g / 6.2 N
 3.77 kg / 8.32 lbs
~0 Gs
3 mm 4.01 kg / 8.84 lbs
2 302 Gs
0.60 kg / 1.33 lbs
601 g / 5.9 N
 3.61 kg / 7.95 lbs
~0 Gs
5 mm 3.57 kg / 7.88 lbs
2 173 Gs
0.54 kg / 1.18 lbs
536 g / 5.3 N
 3.22 kg / 7.09 lbs
~0 Gs
10 mm 2.38 kg / 5.25 lbs
1 775 Gs
0.36 kg / 0.79 lbs
357 g / 3.5 N
 2.14 kg / 4.73 lbs
~0 Gs
20 mm 0.79 kg / 1.74 lbs
1 022 Gs
0.12 kg / 0.26 lbs
119 g / 1.2 N
 0.71 kg / 1.57 lbs
~0 Gs
50 mm 0.03 kg / 0.07 lbs
198 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
60 mm 0.01 kg / 0.03 lbs
127 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
70 mm 0.01 kg / 0.01 lbs
86 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.01 lbs
61 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
44 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
33 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is massive. The repulsion force is a bit weaker than the attraction, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Estimates refer to shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - 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
Mechanical watch 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) 1.0 cm
A strong magnetic field is a large risk to IT equipment and pacemakers. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (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 causes immediate chipping. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction 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 emitted by the magnet pole. Key data when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) drastically limits 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 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%
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: 010449-2026
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This product is an incredibly powerful cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø25x2.5 mm, guarantees optimal power. This specific item is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 2.55 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, 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 cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø25x2.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø25x2.5 mm, which, at a weight of 9.2 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 2.55 kg (force ~25.03 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, 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. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros and cons of rare earth magnets.

Advantages

Besides their immense strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even over nearly 10 years – the drop in strength is only ~1% (based on measurements),
  • They feature excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • A magnet with a smooth nickel surface looks better,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • 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...
  • Possibility of exact machining as well as modifying to precise conditions,
  • Universal use in electronics industry – they are utilized in computer drives, brushless drives, advanced medical instruments, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The force parameter is a measurement result executed under standard conditions:
  • on a base made of structural steel, effectively closing the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an ground touching surface
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at room temperature

Magnet lifting force in use – key factors

Bear in mind that the application force may be lower influenced by elements below, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them shattering into shards.

Magnetic media

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Choking Hazard

These products are not intended for children. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates immediate surgery.

GPS and phone interference

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets close to a device to avoid breaking the sensors.

Power loss in heat

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Finger safety

Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Dust is flammable

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Danger to pacemakers

People with a ICD should keep an safe separation from magnets. The magnetic field can stop the operation of the implant.

Caution required

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.

Nickel allergy

Medical facts indicate that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or opt for coated magnets.

Security! Need more info? Check our post: Are neodymium magnets dangerous?