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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

13.56 ZŁ net + 23% VAT / pcs

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Technical specification of the product - 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

Engineering simulation of the assembly - report

The following data are the direct effect of a engineering simulation. Values are based on algorithms for the material Nd2Fe14B. Actual performance may differ. Use these calculations as a reference point for designers.

Table 1: Static pull force (force vs distance) - characteristics
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
 weak grip
15 mm 493 Gs
49.3 mT
 0.34 kg / 0.74 LBS
336.7 g / 3.3 N
 weak grip
20 mm 287 Gs
28.7 mT
 0.11 kg / 0.25 LBS
114.0 g / 1.1 N
 weak grip
30 mm 115 Gs
11.5 mT
 0.02 kg / 0.04 LBS
18.4 g / 0.2 N
 weak grip
50 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 LBS
1.3 g / 0.0 N
 weak grip
Pulling power drops sharply with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., contamination, varnish, dust) significantly reduces the pull force. Neodymiums operate optimally at the point of direct contact; air break weakens the power. Notice how flashily the pull force fall, when the product does not touch flatly to the metal substrate. When planning the mounting, discard redundant distances.

Table 2: Sliding hold (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
The table below shows the approximate shear load needed to start the downward movement of the magnet vertically on a vertical steel wall (considering standard friction). This value is a function of the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 holder on a upright surface (e.g., a car body), it will maintain barely approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient mean that holders slip faster than they pop off the substrate. Planning a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a noticeably lighter load. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - 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 full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Working in heat (material behavior) - power drop
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
Standard neodymium magnets change their properties strength past the thermal threshold. Watch out for overheating – heat can irreversibly damage this product. With increasing heat, the magnet's power briefly drops. Avoid using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - 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 magnetic products interact from a significantly greater distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a larger range of operation. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
* Estimates refer to friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Remote 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
Extremely neodym field poses a serious hazard to electronic devices as well as medical implants. These NdFeB products generate a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and housings. Increased vigilance must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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 prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or painful pinches to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Coating parameters (durability)
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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 25x5 / N38AH

Parameter Value SI Unit / Description
Magnetic Flux 13 054 Mx 130.5 µWb
Pc Coefficient 0.29 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers and motors. Pc value defines 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

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

2. Steel saturation

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

3. Heat tolerance

*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) = 0.29

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.

Engineering data and GPSR
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%
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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This product is an extremely powerful cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø25x5 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 7.29 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 71.47 N with a weight of only 18.41 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability 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 the strongest magnets in the same volume (Ø25x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
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 value of 71.47 N means that the magnet is capable of holding a weight many times exceeding its own mass of 18.41 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 5 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after around 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets prove to be remarkably resistant to demagnetization caused by external field sources,
  • In other words, due to the reflective finish of nickel, the element looks attractive,
  • The surface of neodymium magnets generates a powerful 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 accurate forming as well as modifying to individual conditions,
  • Versatile presence in innovative solutions – they are utilized in data components, electric motors, diagnostic systems, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, assuming:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

Determinants of practical lifting force of a magnet

In real-world applications, the real power depends on many variables, listed from the most important:
  • Gap (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Metal Allergy

A percentage of the population suffer from a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching can result in a rash. We suggest use protective gloves.

Protective goggles

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Keep away from children

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Keep away from children and animals.

Compass and GPS

Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Crushing force

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Safe distance

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Safe operation

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Power loss in heat

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

Mechanical processing

Powder created during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?