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MW 25x6 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010050

GTIN/EAN: 5906301810490

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

22.09 g

Magnetization Direction

↑ axial

Load capacity

10.27 kg / 100.71 N

Magnetic Induction

268.21 mT / 2682 Gs

Coating

[NiCuNi] Nickel

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7.40 ZŁ with VAT / pcs + price for transport

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Product card - MW 25x6 / N38 - cylindrical magnet

Specification / characteristics - MW 25x6 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010050
GTIN/EAN 5906301810490
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 6 mm [±0,1 mm]
Weight 22.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.27 kg / 100.71 N
Magnetic Induction ~ ? 268.21 mT / 2682 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x6 / 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 analysis of the assembly - data

These values are the result of a physical calculation. Values rely on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - power drop
MW 25x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2682 Gs
268.2 mT
 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
 dangerous!
1 mm 2535 Gs
253.5 mT
 9.18 kg / 20.23 lbs
9177.2 g / 90.0 N
 strong
2 mm 2363 Gs
236.3 mT
 7.97 kg / 17.57 lbs
7971.8 g / 78.2 N
 strong
3 mm 2176 Gs
217.6 mT
 6.76 kg / 14.91 lbs
6761.0 g / 66.3 N
 strong
5 mm 1793 Gs
179.3 mT
 4.59 kg / 10.13 lbs
4592.7 g / 45.1 N
 strong
10 mm 1013 Gs
101.3 mT
 1.46 kg / 3.23 lbs
1464.5 g / 14.4 N
 weak grip
15 mm 565 Gs
56.5 mT
 0.46 kg / 1.00 lbs
455.3 g / 4.5 N
 weak grip
20 mm 330 Gs
33.0 mT
 0.16 kg / 0.34 lbs
155.7 g / 1.5 N
 weak grip
30 mm 134 Gs
13.4 mT
 0.03 kg / 0.06 lbs
25.6 g / 0.3 N
 weak grip
50 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
1.9 g / 0.0 N
 weak grip
Magnetic force decreases drastically per each millimeter of distance. Note that even a very thin break (e.g., contamination, varnish, dust) significantly diminishes the holding power. Neodymiums work strongest in perfect adhesion; air break weakens the power. See how rapidly the load capacity drop, when the magnet does not adhere tightly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Slippage load (wall)
MW 25x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.05 kg / 4.53 lbs
2054.0 g / 20.1 N
1 mm Stal (~0.2) 1.84 kg / 4.05 lbs
1836.0 g / 18.0 N
2 mm Stal (~0.2) 1.59 kg / 3.51 lbs
1594.0 g / 15.6 N
3 mm Stal (~0.2) 1.35 kg / 2.98 lbs
1352.0 g / 13.3 N
5 mm Stal (~0.2) 0.92 kg / 2.02 lbs
918.0 g / 9.0 N
10 mm Stal (~0.2) 0.29 kg / 0.64 lbs
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 lbs
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the estimated holding capacity necessary to start the shifting of the magnet downwards along a upright steel wall (considering standard friction coefficient). This value is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 25x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.08 kg / 6.79 lbs
3081.0 g / 30.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.05 kg / 4.53 lbs
2054.0 g / 20.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.03 kg / 2.26 lbs
1027.0 g / 10.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.14 kg / 11.32 lbs
5135.0 g / 50.4 N
When mounting a magnet on a vertical wall (e.g., a fridge), it will maintain barely approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip mean that products slide down faster than they pop off the substrate. Designing a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Using a rubber coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 25x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.51 kg / 1.13 lbs
513.5 g / 5.0 N
1 mm
13%
 1.28 kg / 2.83 lbs
1283.8 g / 12.6 N
2 mm
25%
 2.57 kg / 5.66 lbs
2567.5 g / 25.2 N
3 mm
38%
 3.85 kg / 8.49 lbs
3851.3 g / 37.8 N
5 mm
63%
 6.42 kg / 14.15 lbs
6418.7 g / 63.0 N
10 mm
100%
 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
11 mm
100%
 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
12 mm
100%
 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
A thin sheet cannot focus the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To utilize full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MW 25x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.27 kg / 22.64 lbs
10270.0 g / 100.7 N
 OK
40 °C -2.2% 10.04 kg / 22.14 lbs
10044.1 g / 98.5 N
 OK
60 °C -4.4% 9.82 kg / 21.65 lbs
9818.1 g / 96.3 N
80 °C -6.6% 9.59 kg / 21.15 lbs
9592.2 g / 94.1 N
100 °C -28.8% 7.31 kg / 16.12 lbs
7312.2 g / 71.7 N
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently damage this magnet. With every degree above norm, the neodymium's force momentarily lowers. Avoid using this magnet in hot environments higher than its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Important note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 25x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.76 kg / 47.98 lbs
4 291 Gs
3.26 kg / 7.20 lbs
3264 g / 32.0 N
 N/A
1 mm 20.66 kg / 45.54 lbs
5 225 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
 18.59 kg / 40.98 lbs
~0 Gs
2 mm 19.45 kg / 42.87 lbs
5 070 Gs
2.92 kg / 6.43 lbs
2917 g / 28.6 N
 17.50 kg / 38.58 lbs
~0 Gs
3 mm 18.18 kg / 40.09 lbs
4 902 Gs
2.73 kg / 6.01 lbs
2727 g / 26.8 N
 16.36 kg / 36.08 lbs
~0 Gs
5 mm 15.60 kg / 34.39 lbs
4 541 Gs
2.34 kg / 5.16 lbs
2340 g / 23.0 N
 14.04 kg / 30.95 lbs
~0 Gs
10 mm 9.73 kg / 21.46 lbs
3 587 Gs
1.46 kg / 3.22 lbs
1460 g / 14.3 N
 8.76 kg / 19.31 lbs
~0 Gs
20 mm 3.10 kg / 6.84 lbs
2 025 Gs
0.47 kg / 1.03 lbs
465 g / 4.6 N
 2.79 kg / 6.16 lbs
~0 Gs
50 mm 0.13 kg / 0.28 lbs
409 Gs
0.02 kg / 0.04 lbs
19 g / 0.2 N
 0.11 kg / 0.25 lbs
~0 Gs
60 mm 0.05 kg / 0.12 lbs
268 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
70 mm 0.03 kg / 0.06 lbs
183 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
80 mm 0.01 kg / 0.03 lbs
131 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
96 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
72 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction for N-N configuration drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Results refer to friction force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 25x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 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
Powerful magnet radiation poses a real danger to IT equipment as well as pacemakers. These magnets generate a flux that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MW 25x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.60 km/h
(6.56 m/s)
 0.47 J
30 mm 37.72 km/h
(10.48 m/s)
 1.21 J
50 mm 48.63 km/h
(13.51 m/s)
 2.02 J
100 mm 68.77 km/h
(19.10 m/s)
 4.03 J
Neodymium magnets are very brittle – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 25x6 / 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)
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 25x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 740 Mx 147.4 µWb
Pc Coefficient 0.34 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 25x6 / N38

Environment Effective steel pull Effect
Air (land) 10.27 kg Standard
Water (riverbed) 11.76 kg
(+1.49 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. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.34

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%
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: 010050-2026
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The offered product is a very strong rod magnet, produced from durable NdFeB material, which, at dimensions of Ø25x6 mm, guarantees optimal power. The MW 25x6 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 10.27 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 100.71 N with a weight of only 22.09 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel 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 high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø25x6), 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 6 mm. The key parameter here is the lifting capacity amounting to approximately 10.27 kg (force ~100.71 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 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 diametrically if your project requires it.

Pros and cons of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their power is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the metallic finish, the layer of nickel, gold-plated, or silver gives an clean appearance,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of precise shaping as well as modifying to defined applications,
  • Wide application in high-tech industry – they are utilized in mass storage devices, electromotive mechanisms, diagnostic systems, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity concerns the maximum value, obtained under ideal test conditions, meaning:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Key elements affecting lifting force

Please note that the magnet holding may be lower influenced by elements below, starting with the most relevant:
  • Air gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin steel does not close the flux, causing part of the flux to be escaped into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Shattering risk

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Health Danger

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Mechanical processing

Powder created during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Immense force

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Do not give to children

Product intended for adults. Small elements can be swallowed, leading to severe trauma. Keep away from kids and pets.

Skin irritation risks

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Impact on smartphones

An intense magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.

Pinching danger

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Electronic devices

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Maximum temperature

Control the heat. Heating the magnet to high heat will ruin its properties and strength.

Danger! Learn more about risks in the article: Magnet Safety Guide.