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MW 25x2.5 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

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

3.95 ZŁ with VAT / pcs + price for transport

3.21 ZŁ net + 23% VAT / pcs

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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

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 assembly - report

These data are the direct effect of a physical analysis. Values rely on models for the class Nd₂Fe₁₄B. Operational performance may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
MW 25x2.5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1216 Gs 121.6 mT	2.55 kg / 2550.0 g 25.0 N	strong
1 mm	1177 Gs 117.7 mT	2.39 kg / 2391.6 g 23.5 N	strong
2 mm	1121 Gs 112.1 mT	2.17 kg / 2166.6 g 21.3 N	strong
3 mm	1050 Gs 105.0 mT	1.90 kg / 1902.7 g 18.7 N	low risk
5 mm	887 Gs 88.7 mT	1.36 kg / 1358.4 g 13.3 N	low risk
10 mm	511 Gs 51.1 mT	0.45 kg / 450.5 g 4.4 N	low risk
15 mm	282 Gs 28.2 mT	0.14 kg / 137.4 g 1.3 N	low risk
20 mm	162 Gs 16.2 mT	0.05 kg / 45.4 g 0.4 N	low risk
30 mm	64 Gs 6.4 mT	0.01 kg / 7.0 g 0.1 N	low risk
50 mm	17 Gs 1.7 mT	0.00 kg / 0.5 g 0.0 N	low risk

Pulling power weakens significantly with every mm of distance. Keep in mind that every additional insulation layer (e.g., dirt, paint, rust) strongly diminishes the holding power. Magnets work optimally at the point of direct contact; gap weakens the force. Analyze how quickly the parameters plummet, when the product does not adhere flatly to the steel surface. When planning the mounting, discard additional spacers.

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

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.51 kg / 510.0 g 5.0 N
1 mm	Stal (~0.2)	0.48 kg / 478.0 g 4.7 N
2 mm	Stal (~0.2)	0.43 kg / 434.0 g 4.3 N
3 mm	Stal (~0.2)	0.38 kg / 380.0 g 3.7 N
5 mm	Stal (~0.2)	0.27 kg / 272.0 g 2.7 N
10 mm	Stal (~0.2)	0.09 kg / 90.0 g 0.9 N
15 mm	Stal (~0.2)	0.03 kg / 28.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section defines the estimated weight limit necessary to start the slippage of the magnet vertically against a vertical metal surface (assuming typical friction coefficient). This parameter is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 25x2.5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.76 kg / 765.0 g 7.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.51 kg / 510.0 g 5.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.26 kg / 255.0 g 2.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.28 kg / 1275.0 g 12.5 N

When placing a element on a upright surface (e.g., a car body), it will maintain just approx. 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient mean that holders slide down faster than they pop off the substrate. Want to create a vertical fastening? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a significantly smaller load. Using a rubber layer can significantly raise the stability.

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

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.26 kg / 255.0 g 2.5 N
1 mm	25%	0.64 kg / 637.5 g 6.3 N
2 mm	50%	1.28 kg / 1275.0 g 12.5 N
5 mm	100%	2.55 kg / 2550.0 g 25.0 N
10 mm	100%	2.55 kg / 2550.0 g 25.0 N

A too thin steel is unable to absorb the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a weak sheet, the magnetism will pass right through and the holding will be smaller. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The material oversaturation causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We advise picking the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - power drop
MW 25x2.5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	2.55 kg / 2550.0 g 25.0 N	OK
40 °C	-2.2%	2.49 kg / 2493.9 g 24.5 N	OK
60 °C	-4.4%	2.44 kg / 2437.8 g 23.9 N
80 °C	-6.6%	2.38 kg / 2381.7 g 23.4 N
100 °C	-28.8%	1.82 kg / 1815.6 g 17.8 N

Classic neodymiums lose parameters past the thermal threshold. Protect against heat – excessive heat can permanently demagnetize this product. As the temperature rises, the magnet's force briefly decreases. Refrain from using this product close to ovens exceeding its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.

*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

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

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.47 kg / 4472 g 43.9 N 2 302 Gs	N/A
1 mm	4.35 kg / 4351 g 42.7 N 2 398 Gs	3.92 kg / 3916 g 38.4 N ~0 Gs
2 mm	4.19 kg / 4194 g 41.1 N 2 355 Gs	3.77 kg / 3775 g 37.0 N ~0 Gs
3 mm	4.01 kg / 4009 g 39.3 N 2 302 Gs	3.61 kg / 3608 g 35.4 N ~0 Gs
5 mm	3.57 kg / 3574 g 35.1 N 2 173 Gs	3.22 kg / 3216 g 31.6 N ~0 Gs
10 mm	2.38 kg / 2382 g 23.4 N 1 775 Gs	2.14 kg / 2144 g 21.0 N ~0 Gs
20 mm	0.79 kg / 790 g 7.8 N 1 022 Gs	0.71 kg / 711 g 7.0 N ~0 Gs
50 mm	0.03 kg / 30 g 0.3 N 198 Gs	0.03 kg / 27 g 0.3 N ~0 Gs

Two strong neodymiums interact from a much further distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a wider radius of action. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Protective zones (implants) - precautionary measures
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

Extremely neodym field poses a large risk to electronic devices as well as pacemakers. These magnets generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

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

Start from (mm)	Speed (km/h)	Energy (J)
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

Neodymium magnets are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when working with large magnets.

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)

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 (P_c)
MW 25x2.5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	7 872 Mx	78.7 µWb
P_c Coefficient	0.16	Low (Flat)

Flux value emitted by the magnet pole. Key data when building generators as well as sensors. The P_c coefficient defines the magnet's operating point.

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%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Vertical hold

*Warning: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

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

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 P_c (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 P_c 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.

Engineering data and GPSR

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: 010449-2025

Measurement Calculator

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Force in kg

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SMZR 25x200 / N52 - magnetic separator with handle

553.50 ZŁ brutto / pcs

This product is an extremely powerful cylindrical magnet, produced from advanced NdFeB material, which, with dimensions of Ø25x2.5 mm, guarantees optimal power. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.55 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 25.03 N with a weight of only 9.2 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Since our magnets have a very precise dimensions, 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 automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where excessive 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 in continuous sale 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 high magnetic energy density. The key parameter here is the lifting capacity 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.

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 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.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Advantages

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
They feature excellent resistance to weakening of magnetic properties as a result of external fields,
A magnet with a shiny nickel surface is more attractive,
The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Possibility of accurate machining as well as adjusting to specific applications,
Universal use in future technologies – they find application in data components, electric motors, medical equipment, as well as modern systems.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Cons of neodymium magnets: tips and applications.

To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets usually 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.
Limited possibility of producing nuts in the magnet and complicated forms - recommended is a housing - mounting mechanism.
Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Highest magnetic holding force – what it depends on?

Holding force of 2.55 kg is a measurement result performed under standard conditions:

using a sheet made of low-carbon steel, serving as a ideal flux conductor
with a thickness of at least 10 mm
with a surface free of scratches
without any air gap between the magnet and steel
during detachment in a direction perpendicular to the mounting surface
at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower subject to the following factors, starting with the most relevant:

Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
Base massiveness – too thin plate does not close the flux, causing part of the power to be escaped to the other side.
Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets

This is not a toy

Neodymium magnets are not toys. Swallowing several magnets may result in them attracting across intestines, which constitutes a direct threat to life and requires immediate surgery.

Mechanical processing

Dust generated during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.

Do not overheat magnets

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Compass and GPS

Remember: rare earth magnets produce a field that disrupts precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Data carriers

Avoid bringing magnets close to a purse, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Danger to pacemakers

Patients with a ICD must maintain an large gap from magnets. The magnetic field can disrupt the operation of the life-saving device.

Risk of cracking

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Caution required

Handle with care. Rare earth magnets act from a distance and snap with massive power, often quicker than you can react.

Caution! Details about risks in the article: Safety of working with magnets.

MW 25x2.5 / N38 - cylindrical magnet

Need advice?

MW 25x2.5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the assembly - report

1. Vertical hold

2. Steel saturation

3. Temperature resistance

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Induction

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SMZR 25x200 / N52 - magnetic separator with handle

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Limitations

Lifting parameters

Highest magnetic holding force – what it depends on?

Magnet lifting force in use – key factors

This is not a toy

Mechanical processing

Pinching danger

Do not overheat magnets

Compass and GPS

Data carriers

Nickel coating and allergies

Danger to pacemakers

Risk of cracking

Caution required

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages and disadvantages of Nd₂Fe₁₄B magnets.