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MW 25x5 / N38AH - cylindrical magnet

cylindrical magnet

Catalog no 010501

GTIN/EAN: 5906301814993

Diameter Ø

25 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

18.41 g

Magnetization Direction

↑ axial

Load capacity

7.29 kg / 71.47 N

Magnetic Induction

219.99 mT / 2200 Gs

Coating

[NiCuNi] Nickel

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16.68 ZŁ with VAT / pcs + price for transport

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Technical specification - MW 25x5 / N38AH - cylindrical magnet

Specification / characteristics - MW 25x5 / N38AH - cylindrical magnet

properties
properties values
Cat. no. 010501
GTIN/EAN 5906301814993
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 5 mm [±0,1 mm]
Weight 18.41 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.29 kg / 71.47 N
Magnetic Induction ~ ? 219.99 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38AH

Specification / characteristics MW 25x5 / N38AH - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.5 kGs
remenance Br [min. - max.] ? 1120-1250 mT
coercivity bHc ? ≥ 11.3 kOe
coercivity bHc ? ≥ 899 kA/m
actual internal force iHc ≥ 33 kOe
actual internal force iHc ≥ 2624 kA/m
energy density [min. - max.] ? 36-39 BH max MGOe
energy density [min. - max.] ? 287-310 BH max KJ/m
max. temperature ? ≤ 230 °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 analysis of the assembly - report

Presented information constitute the result of a engineering analysis. Values rely on models for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
MW 25x5 / N38AH

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2292 Gs
229.2 mT
 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
 warning
1 mm 2180 Gs
218.0 mT
 6.59 kg / 14.53 lbs
6591.0 g / 64.7 N
 warning
2 mm 2042 Gs
204.2 mT
 5.78 kg / 12.75 lbs
5782.0 g / 56.7 N
 warning
3 mm 1888 Gs
188.8 mT
 4.94 kg / 10.90 lbs
4942.8 g / 48.5 N
 warning
5 mm 1564 Gs
156.4 mT
 3.39 kg / 7.48 lbs
3394.1 g / 33.3 N
 warning
10 mm 886 Gs
88.6 mT
 1.09 kg / 2.40 lbs
1089.7 g / 10.7 N
 safe
15 mm 493 Gs
49.3 mT
 0.34 kg / 0.74 lbs
336.7 g / 3.3 N
 safe
20 mm 287 Gs
28.7 mT
 0.11 kg / 0.25 lbs
114.0 g / 1.1 N
 safe
30 mm 115 Gs
11.5 mT
 0.02 kg / 0.04 lbs
18.4 g / 0.2 N
 safe
50 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
1.3 g / 0.0 N
 safe
Pulling power decreases significantly with every mm of spacing. Keep in mind that even a very thin break (e.g., dirt, paint, rust) significantly weakens the grip. Magnets operate most effectively in perfect adhesion; distance drastically cuts the force. Notice how quickly the parameters drop, when the product does not touch tightly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Slippage force (vertical surface)
MW 25x5 / N38AH

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.46 kg / 3.21 lbs
1458.0 g / 14.3 N
1 mm Stal (~0.2) 1.32 kg / 2.91 lbs
1318.0 g / 12.9 N
2 mm Stal (~0.2) 1.16 kg / 2.55 lbs
1156.0 g / 11.3 N
3 mm Stal (~0.2) 0.99 kg / 2.18 lbs
988.0 g / 9.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 lbs
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.22 kg / 0.48 lbs
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.15 lbs
68.0 g / 0.7 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section shows the theoretical force necessary to start the slippage of the magnet down against a vertical steel wall (assuming standard friction coefficient). This value depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 25x5 / N38AH

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.19 kg / 4.82 lbs
2187.0 g / 21.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.46 kg / 3.21 lbs
1458.0 g / 14.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.73 kg / 1.61 lbs
729.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.65 kg / 8.04 lbs
3645.0 g / 35.8 N
When placing a element on a vertical plane (e.g., a fridge), it will maintain only about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip cause that magnets slip faster than they detach. Planning a vertical fastening? Remember that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the element will slide down under a much lighter load. Utilizing a rubberized coating can significantly improve the result.

Table 4: Steel thickness (saturation) - power losses
MW 25x5 / N38AH

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.73 kg / 1.61 lbs
729.0 g / 7.2 N
1 mm
25%
 1.82 kg / 4.02 lbs
1822.5 g / 17.9 N
2 mm
50%
 3.65 kg / 8.04 lbs
3645.0 g / 35.8 N
3 mm
75%
 5.47 kg / 12.05 lbs
5467.5 g / 53.6 N
5 mm
100%
 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
10 mm
100%
 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
11 mm
100%
 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
12 mm
100%
 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
A too thin steel is unable to conduct the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's potential, you need a suitably thick backing of metal. The material oversaturation causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 25x5 / N38AH

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.29 kg / 16.07 lbs
7290.0 g / 71.5 N
 OK
80 °C -6.6% 6.81 kg / 15.01 lbs
6808.9 g / 66.8 N
150 °C -14.3% 6.25 kg / 13.77 lbs
6247.5 g / 61.3 N
200 °C -19.8% 5.85 kg / 12.89 lbs
5846.6 g / 57.4 N
230 °C -23.1% 5.61 kg / 12.36 lbs
5606.0 g / 55.0 N
250 °C -45.3% 3.99 kg / 8.79 lbs
3987.6 g / 39.1 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Avoid high temperatures – heat can permanently destroy this product. With every degree above norm, the neodymium's force briefly lowers. Do not use this product close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 25x5 / N38AH

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 15.90 kg / 35.06 lbs
3 855 Gs
2.39 kg / 5.26 lbs
2385 g / 23.4 N
 N/A
1 mm 15.19 kg / 33.48 lbs
4 480 Gs
2.28 kg / 5.02 lbs
2278 g / 22.3 N
 13.67 kg / 30.13 lbs
~0 Gs
2 mm 14.38 kg / 31.70 lbs
4 359 Gs
2.16 kg / 4.75 lbs
2157 g / 21.2 N
 12.94 kg / 28.53 lbs
~0 Gs
3 mm 13.51 kg / 29.79 lbs
4 226 Gs
2.03 kg / 4.47 lbs
2027 g / 19.9 N
 12.16 kg / 26.81 lbs
~0 Gs
5 mm 11.70 kg / 25.79 lbs
3 932 Gs
1.75 kg / 3.87 lbs
1755 g / 17.2 N
 10.53 kg / 23.21 lbs
~0 Gs
10 mm 7.40 kg / 16.32 lbs
3 128 Gs
1.11 kg / 2.45 lbs
1111 g / 10.9 N
 6.66 kg / 14.69 lbs
~0 Gs
20 mm 2.38 kg / 5.24 lbs
1 773 Gs
0.36 kg / 0.79 lbs
357 g / 3.5 N
 2.14 kg / 4.72 lbs
~0 Gs
50 mm 0.09 kg / 0.21 lbs
354 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.09 kg / 0.19 lbs
~0 Gs
60 mm 0.04 kg / 0.09 lbs
231 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
70 mm 0.02 kg / 0.04 lbs
157 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
112 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.01 kg / 0.01 lbs
82 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
62 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 wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of action. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still large.
*Field value in repulsion mode drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
Note: Figures demonstrate shear force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 25x5 / N38AH

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a large risk to electronic devices as well as pacemakers. These NdFeB products generate a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MW 25x5 / N38AH

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.86 km/h
(6.07 m/s)
 0.34 J
30 mm 34.81 km/h
(9.67 m/s)
 0.86 J
50 mm 44.88 km/h
(12.47 m/s)
 1.43 J
100 mm 63.46 km/h
(17.63 m/s)
 2.86 J
Magnetic elements are very brittle – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MW 25x5 / N38AH

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 (Pc)
MW 25x5 / N38AH

Parameter Value SI Unit / Description
Magnetic Flux 13 054 Mx 130.5 µWb
Pc Coefficient 0.29 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MW 25x5 / N38AH

Environment Effective steel pull Effect
Air (land) 7.29 kg Standard
Water (riverbed) 8.35 kg
(+1.06 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. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29

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 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%
Ecology and recycling (GPSR)
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: 010501-2026
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The presented product is an extremely powerful cylinder magnet, made from durable NdFeB material, which, with dimensions of Ø25x5 mm, guarantees optimal power. The MW 25x5 / N38AH model boasts a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 7.29 kg), this product is available off-the-shelf 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 finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 71.47 N with a weight of only 18.41 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
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 two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø25x5), 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 Ø25x5 mm, which, at a weight of 18.41 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 7.29 kg (force ~71.47 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 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 rare earth magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain magnetic properties for almost 10 years – the drop is just ~1% (in theory),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a smooth silver surface has better aesthetics,
  • Magnetic induction on the working part of the magnet is impressive,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Considering the option of free forming and customization to individualized needs, magnetic components can be modeled in a broad palette of shapes and sizes, which amplifies use scope,
  • Universal use in high-tech industry – they serve a role in mass storage devices, drive modules, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • Brittleness 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
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complex forms - recommended is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • using a sheet made of low-carbon steel, serving as a circuit closing element
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • without any air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Holding efficiency impacted by working environment parameters, mainly (from most important):
  • Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted to the other side.
  • Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Base smoothness – 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 are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Finger safety

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

Keep away from electronics

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Implant safety

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.

No play value

These products are not toys. Swallowing a few magnets may result in them attracting across intestines, which poses a critical condition and necessitates urgent medical intervention.

Permanent damage

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

Warning for allergy sufferers

Some people suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Frequent touching may cause skin redness. We suggest use protective gloves.

Handling rules

Use magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their power.

Magnets are brittle

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Combustion hazard

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Keep away from computers

Powerful magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Safety First! Details about hazards in the article: Magnet Safety Guide.