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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

technical parameters »

7.40 ZŁ with VAT / pcs + price for transport

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Technical specification of the product - 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

Physical modeling of the product - data

These data constitute the direct effect of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Actual parameters may differ. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
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
 critical level
1 mm 2535 Gs
253.5 mT
 9.18 kg / 20.23 lbs
9177.2 g / 90.0 N
 warning
2 mm 2363 Gs
236.3 mT
 7.97 kg / 17.57 lbs
7971.8 g / 78.2 N
 warning
3 mm 2176 Gs
217.6 mT
 6.76 kg / 14.91 lbs
6761.0 g / 66.3 N
 warning
5 mm 1793 Gs
179.3 mT
 4.59 kg / 10.13 lbs
4592.7 g / 45.1 N
 warning
10 mm 1013 Gs
101.3 mT
 1.46 kg / 3.23 lbs
1464.5 g / 14.4 N
 low risk
15 mm 565 Gs
56.5 mT
 0.46 kg / 1.00 lbs
455.3 g / 4.5 N
 low risk
20 mm 330 Gs
33.0 mT
 0.16 kg / 0.34 lbs
155.7 g / 1.5 N
 low risk
30 mm 134 Gs
13.4 mT
 0.03 kg / 0.06 lbs
25.6 g / 0.3 N
 low risk
50 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
1.9 g / 0.0 N
 low risk
Magnetic force weakens drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Neodymiums operate most effectively during direct contact; air break nullifies the power. Analyze how flashily the pull force plummet, when the product does not touch flatly to the steel surface. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Slippage capacity (vertical surface)
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
This section indicates the approximate shear load needed to initiate the slippage of the magnet downwards on a upright steel wall (assuming standard friction coefficient). This parameter depends on the distance 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 placing a holder on a vertical plane (e.g., a car body), it you can count on only approx. 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slide down faster than they pop off the substrate. Designing a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will slide down under a much lighter weight. Utilizing a rubberized pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - 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 metal plate cannot absorb the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you need a suitably thick backing of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - power drop
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
Ordinary NdFeB products change their properties strength past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this product. With every degree above norm, the neodymium's force temporarily lowers. Avoid using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently at lower temperatures than long magnets. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - 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 magnets interact from a significantly greater distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a further horizon of operation. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The levitation is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
Note: Estimates apply to shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
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
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 real danger to IT equipment and pacemakers. These NdFeB products produce a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. 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
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Surface protection spec
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains just approx. 20-30% of its max power.

2. Steel saturation

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

3. Temperature resistance

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

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

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

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 specification and ecology
Elemental analysis
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: 010050-2026
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The presented product is an incredibly powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø25x6 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 10.27 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 100.71 N with a weight of only 22.09 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability 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 popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 in continuous sale in our store.
This model is characterized by dimensions Ø25x6 mm, which, at a weight of 22.09 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 10.27 kg (force ~100.71 N), which, with such defined dimensions, proves the high power of the NdFeB material. 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 6 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a smooth nickel surface has better aesthetics,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in designing and the ability to modify to client solutions,
  • Huge importance in advanced technology sectors – they find application in data components, drive modules, advanced medical instruments, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

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 increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited ability of creating threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
  • Possible danger related to microscopic parts 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 elements of these products are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Highest magnetic holding force – what affects it?

The specified lifting capacity refers to the peak performance, recorded under optimal environment, specifically:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • with a cross-section no less than 10 mm
  • with a plane free of scratches
  • with direct contact (no paint)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

Real force is influenced by specific conditions, such as (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is high-permeability steel. Stainless steels may attract less.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Hand protection

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Allergic reactions

It is widely known that nickel (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or opt for coated magnets.

Fire risk

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

No play value

These products are not intended for children. Eating several magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.

Health Danger

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Safe operation

Use magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their force.

Keep away from computers

Do not bring magnets near a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Fragile material

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Attention! Want to know more? Read our article: Why are neodymium magnets dangerous?