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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

product specifications »

3.95 ZŁ with VAT / pcs + price for transport

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Physical properties - 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 modeling of the product - report

Presented data are the result of a physical simulation. Results are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static force (pull vs distance) - 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
 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 decreases significantly per each millimeter of gap. Remember that even a very thin break (e.g., contamination, varnish, veneer) noticeably reduces the pull force. Neodymiums operate strongest at the point of direct contact; distance kills the power. Observe how flashily the load capacity drop, when the product does not touch tightly to the steel surface. When calculating the arrangement, avoid redundant distances.

Table 2: Shear force (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 table below indicates the estimated weight limit required to initiate the shifting of the magnet down along a vertical steel wall (assuming standard friction coefficient). This value is relative to the air gap 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/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 mounting a holder on a upright surface (e.g., a car body), it you can count on barely approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that magnets move down faster than they pull off. Designing a vertical fastening? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a much lighter load. Application of an anti-slip pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - 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 cannot conduct the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's potential, you need a suitably thick piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - 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
Standard neodymium magnets change their properties power above the temperature limit. Avoid high temperatures – heat can permanently demagnetize this product. As the temperature rises, the neodymium's power momentarily drops. Refrain from using this magnet in hot environments exceeding its safe range. Exceeding the critical threshold will result in destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 25x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 interact from a wider radius than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a further horizon of action. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Figures show friction force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - 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
A strong magnetic field is a large risk to electronics as well as pacemakers. These NdFeB products produce a flux that destroys function of sensitive medical devices. Notice: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
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 prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Corrosion 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Temperature resistance

*For N38 material, 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.

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%
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
Quick Unit Converter
Force (pull)
Magnetic Field
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The presented product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø25x2.5 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding 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 quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, 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 low weight is crucial.
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 two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability 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 available off-the-shelf 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 grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 through the diameter if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Pros

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even during approximately ten years – the reduction in strength is only ~1% (according to tests),
  • They feature excellent resistance to magnetism drop as a result of external magnetic sources,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual forming as well as modifying to complex needs,
  • Wide application in future technologies – they serve a role in magnetic memories, motor assemblies, precision medical tools, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Cons

Problematic aspects of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. 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 while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest casing - 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, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 2.55 kg is a result of laboratory testing executed under specific, ideal conditions:
  • using a base made of high-permeability steel, functioning as a ideal flux conductor
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

It is worth knowing that the working load will differ depending on elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped into the air.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Heat – NdFeB sinters 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 checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Bodily injuries

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

Magnet fragility

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

GPS Danger

Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Health Danger

For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Flammability

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Electronic devices

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Handling guide

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Heat warning

Control the heat. Exposing the magnet to high heat will destroy its magnetic structure and strength.

Nickel coating and allergies

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands and opt for encased magnets.

Product not for children

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are life-threatening.

Security! Details about risks in the article: Magnet Safety Guide.