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MW 25x12 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010502

GTIN/EAN: 5906301814986

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

44.18 g

Magnetization Direction

↑ axial

Load capacity

19.60 kg / 192.25 N

Magnetic Induction

429.18 mT / 4292 Gs

Coating

[NiCuNi] Nickel

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16.64 ZŁ with VAT / pcs + price for transport

13.53 ZŁ net + 23% VAT / pcs

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Strength as well as structure of neodymium magnets can be estimated on our our magnetic calculator.

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Technical of the product - MW 25x12 / N38 - cylindrical magnet

Specification / characteristics - MW 25x12 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010502
GTIN/EAN 5906301814986
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 12 mm [±0,1 mm]
Weight 44.18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.60 kg / 192.25 N
Magnetic Induction ~ ? 429.18 mT / 4292 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x12 / 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 simulation of the product - technical parameters

Presented information are the direct effect of a engineering calculation. Values are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ. Use these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - power drop
MW 25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4291 Gs
429.1 mT
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
 crushing
1 mm 3975 Gs
397.5 mT
 16.82 kg / 37.08 pounds
16820.5 g / 165.0 N
 crushing
2 mm 3645 Gs
364.5 mT
 14.15 kg / 31.19 pounds
14147.5 g / 138.8 N
 crushing
3 mm 3316 Gs
331.6 mT
 11.71 kg / 25.81 pounds
11707.5 g / 114.9 N
 crushing
5 mm 2692 Gs
269.2 mT
 7.72 kg / 17.02 pounds
7718.0 g / 75.7 N
 warning
10 mm 1518 Gs
151.8 mT
 2.45 kg / 5.41 pounds
2451.8 g / 24.1 N
 warning
15 mm 863 Gs
86.3 mT
 0.79 kg / 1.75 pounds
793.5 g / 7.8 N
 low risk
20 mm 517 Gs
51.7 mT
 0.29 kg / 0.63 pounds
285.1 g / 2.8 N
 low risk
30 mm 219 Gs
21.9 mT
 0.05 kg / 0.11 pounds
51.2 g / 0.5 N
 low risk
50 mm 63 Gs
6.3 mT
 0.00 kg / 0.01 pounds
4.2 g / 0.0 N
 low risk
Magnetic force decreases sharply with every mm of gap. Remember that even the smallest gap (e.g., contamination, paint, dust) strongly diminishes the holding power. Magnetic products operate strongest at the point of direct contact; gap weakens the force. Notice how quickly the parameters drop, when the product does not adhere flatly to the steel surface. When calculating the arrangement, avoid redundant distances.

Table 2: Vertical hold (vertical surface)
MW 25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.92 kg / 8.64 pounds
3920.0 g / 38.5 N
1 mm Stal (~0.2) 3.36 kg / 7.42 pounds
3364.0 g / 33.0 N
2 mm Stal (~0.2) 2.83 kg / 6.24 pounds
2830.0 g / 27.8 N
3 mm Stal (~0.2) 2.34 kg / 5.16 pounds
2342.0 g / 23.0 N
5 mm Stal (~0.2) 1.54 kg / 3.40 pounds
1544.0 g / 15.1 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.16 kg / 0.35 pounds
158.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data defines the estimated holding capacity needed to initiate the shifting of the magnet downwards on a upright steel wall (considering typical friction). This parameter depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.88 kg / 12.96 pounds
5880.0 g / 57.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.92 kg / 8.64 pounds
3920.0 g / 38.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.96 kg / 4.32 pounds
1960.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.80 kg / 21.61 pounds
9800.0 g / 96.1 N
When hanging a holder on a vertical surface (e.g., a car body), it will maintain only approx. 1/5 of its nominal power. Gravity as well as a low friction coefficient mean that products slide down faster than they detach. Want to create a hanger? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter weight. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MW 25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.16 pounds
980.0 g / 9.6 N
1 mm
13%
 2.45 kg / 5.40 pounds
2450.0 g / 24.0 N
2 mm
25%
 4.90 kg / 10.80 pounds
4900.0 g / 48.1 N
3 mm
38%
 7.35 kg / 16.20 pounds
7350.0 g / 72.1 N
5 mm
63%
 12.25 kg / 27.01 pounds
12250.0 g / 120.2 N
10 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
11 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
12 mm
100%
 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
A too thin steel is not enough to conduct the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this magnet's power, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.60 kg / 43.21 pounds
19600.0 g / 192.3 N
 OK
40 °C -2.2% 19.17 kg / 42.26 pounds
19168.8 g / 188.0 N
 OK
60 °C -4.4% 18.74 kg / 41.31 pounds
18737.6 g / 183.8 N
80 °C -6.6% 18.31 kg / 40.36 pounds
18306.4 g / 179.6 N
100 °C -28.8% 13.96 kg / 30.77 pounds
13955.2 g / 136.9 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – high temperature can irreversibly damage this product. As the temperature rises, the neodymium's force temporarily drops. Refrain from using this product close to ovens higher than its working range. Too high temperature will cause irreversible degradation of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 55.71 kg / 122.82 pounds
5 494 Gs
8.36 kg / 18.42 pounds
8357 g / 82.0 N
 N/A
1 mm 51.78 kg / 114.14 pounds
8 273 Gs
7.77 kg / 17.12 pounds
7766 g / 76.2 N
 46.60 kg / 102.73 pounds
~0 Gs
2 mm 47.81 kg / 105.40 pounds
7 949 Gs
7.17 kg / 15.81 pounds
7172 g / 70.4 N
 43.03 kg / 94.86 pounds
~0 Gs
3 mm 43.94 kg / 96.88 pounds
7 621 Gs
6.59 kg / 14.53 pounds
6592 g / 64.7 N
 39.55 kg / 87.19 pounds
~0 Gs
5 mm 36.65 kg / 80.80 pounds
6 960 Gs
5.50 kg / 12.12 pounds
5497 g / 53.9 N
 32.98 kg / 72.72 pounds
~0 Gs
10 mm 21.94 kg / 48.36 pounds
5 385 Gs
3.29 kg / 7.25 pounds
3291 g / 32.3 N
 19.74 kg / 43.53 pounds
~0 Gs
20 mm 6.97 kg / 15.36 pounds
3 035 Gs
1.05 kg / 2.30 pounds
1045 g / 10.3 N
 6.27 kg / 13.83 pounds
~0 Gs
50 mm 0.33 kg / 0.72 pounds
657 Gs
0.05 kg / 0.11 pounds
49 g / 0.5 N
 0.29 kg / 0.65 pounds
~0 Gs
60 mm 0.15 kg / 0.32 pounds
439 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
70 mm 0.07 kg / 0.16 pounds
306 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
80 mm 0.04 kg / 0.08 pounds
221 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.05 pounds
165 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
126 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel setup. Such a system of two magnets generates a stronger field and a wider radius of performance. Want to build a powerful holder? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The levitation is marginally weaker than the connection force, but still significant.
*Field value between like poles is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
* Estimates refer to sliding force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field is a real danger to electronics and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.84 km/h
(6.35 m/s)
 0.89 J
30 mm 36.85 km/h
(10.24 m/s)
 2.31 J
50 mm 47.51 km/h
(13.20 m/s)
 3.85 J
100 mm 67.17 km/h
(18.66 m/s)
 7.69 J
NdFeB products are prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact 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 collision at high speed ends with a crack of the magnet. Use safety goggles when working with large magnets.

Table 9: Coating parameters (durability)
MW 25x12 / 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 (Pc)
MW 25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 413 Mx 214.1 µWb
Pc Coefficient 0.57 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 25x12 / N38

Environment Effective steel pull Effect
Air (land) 19.60 kg Standard
Water (riverbed) 22.44 kg
(+2.84 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds only a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.57

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 specification and ecology
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%
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: 010502-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
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The offered product is an incredibly powerful cylinder magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø25x12 mm, guarantees the highest energy density. The MW 25x12 / N38 component boasts high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 19.60 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 192.25 N with a weight of only 44.18 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 25.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø25x12), 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 Ø25x12 mm, which, at a weight of 44.18 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 19.60 kg (force ~192.25 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 12 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.

Pros and cons of rare earth magnets.

Benefits

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even after approximately 10 years – the drop in strength is only ~1% (based on measurements),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the reflective finish of gold, the element becomes visually attractive,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • 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...
  • Possibility of individual creating as well as optimizing to individual requirements,
  • Universal use in innovative solutions – they are used in HDD drives, motor assemblies, advanced medical instruments, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, small components of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

Holding force of 19.60 kg is a measurement result performed under the following configuration:
  • using a sheet made of mild steel, acting as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • with a surface perfectly flat
  • with zero gap (without impurities)
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Bear in mind that the working load will differ influenced by elements below, in order of importance:
  • Clearance – existence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas 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.

Precautions when working with neodymium magnets
Do not give to children

Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are tragic.

Warning for heart patients

Patients with a heart stimulator have to keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Protect data

Do not bring magnets near a wallet, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Phone sensors

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Do not drill into magnets

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

Protective goggles

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Thermal limits

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Respect the power

Use magnets with awareness. Their huge power can shock even experienced users. Plan your moves and respect their power.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or select encased magnets.

Pinching danger

Mind your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Important! Need more info? Read our article: Are neodymium magnets dangerous?