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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

view parameters »

3.95 ZŁ with VAT / pcs + price for transport

3.21 ZŁ net + 23% VAT / pcs

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Technical of the product - 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 modeling of the magnet - data

The following information constitute the direct effect of a mathematical simulation. Results rely on models for the class Nd2Fe14B. Real-world conditions might slightly differ. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
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
 warning
1 mm 1177 Gs
117.7 mT
 2.39 kg / 5.27 LBS
2391.6 g / 23.5 N
 warning
2 mm 1121 Gs
112.1 mT
 2.17 kg / 4.78 LBS
2166.6 g / 21.3 N
 warning
3 mm 1050 Gs
105.0 mT
 1.90 kg / 4.19 LBS
1902.7 g / 18.7 N
 safe
5 mm 887 Gs
88.7 mT
 1.36 kg / 2.99 LBS
1358.4 g / 13.3 N
 safe
10 mm 511 Gs
51.1 mT
 0.45 kg / 0.99 LBS
450.5 g / 4.4 N
 safe
15 mm 282 Gs
28.2 mT
 0.14 kg / 0.30 LBS
137.4 g / 1.3 N
 safe
20 mm 162 Gs
16.2 mT
 0.05 kg / 0.10 LBS
45.4 g / 0.4 N
 safe
30 mm 64 Gs
6.4 mT
 0.01 kg / 0.02 LBS
7.0 g / 0.1 N
 safe
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 safe
Magnetic force weakens drastically with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, varnish, dust) noticeably diminishes the holding power. Magnetic products work optimally in perfect adhesion; air break weakens the force. See how rapidly the parameters drop, when the magnet does not touch flatly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Slippage force (vertical surface)
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 table below presents the approximate holding capacity necessary to cause the downward movement of the magnet vertically along a upright steel plate (considering standard friction coefficient). This parameter is a function of the air gap 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 hanging a magnet on a vertical plane (e.g., a fridge), it you can count on only about 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that products slip easier than they detach. Want to create a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a noticeably lighter cargo. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (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 thin sheet is unable to take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a weak sheet, the flux will pass right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick backing of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
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
Ordinary NdFeB products irreversibly lose parameters past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this product. As the temperature rises, the magnet's power briefly lowers. Refrain from using this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
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 magnets interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a larger range of action. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the pinch force is huge. The levitation is slightly lower than the connection force, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Results show sliding force of two identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

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
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 is a serious hazard to IT equipment as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - 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
NdFeB products are very brittle – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
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 in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
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. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical surface, the magnet retains just a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

*For N38 grade, the critical 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
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: 010449-2026
Measurement Calculator
Pulling force
Field Strength
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The presented product is an extremely powerful rod magnet, produced from advanced NdFeB material, which, at dimensions of Ø25x2.5 mm, guarantees optimal power. The MW 25x2.5 / N38 component boasts high dimensional repeatability and industrial build quality, making it a perfect 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 quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 25.03 N with a weight of only 9.2 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel 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 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 key parameter here is the holding force amounting to approximately 2.55 kg (force ~25.03 N), which, with such defined 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.
This cylinder 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. 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly ten years – the loss is just ~1% (according to analyses),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external field sources,
  • By covering with a lustrous coating of gold, the element acquires an elegant look,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • 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 freedom in forming and the ability to modify to unusual requirements,
  • Wide application in future technologies – they find application in data components, electromotive mechanisms, advanced medical instruments, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

Breakaway force was determined for the most favorable conditions, including:
  • on a block made of structural steel, optimally conducting the magnetic field
  • with a thickness minimum 10 mm
  • with an polished contact surface
  • with direct contact (without coatings)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding may be lower influenced by the following factors, in order of importance:
  • Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Beware of splinters

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them breaking into small pieces.

Pacemakers

Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Product not for children

These products are not intended for children. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and requires urgent medical intervention.

Crushing force

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Be careful!

Combustion hazard

Mechanical processing of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Data carriers

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, timepieces).

Avoid contact if allergic

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop working with magnets and wear gloves.

Phone sensors

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Operating temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Handling guide

Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and respect their power.

Attention! Learn more about risks in the article: Safety of working with magnets.