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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 details - 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

Physical analysis of the magnet - technical parameters

These information represent the result of a mathematical analysis. Results are based on models for the class Nd2Fe14B. Actual performance might slightly differ. Use these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - 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
 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
Grip strength drops sharply with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, veneer) strongly reduces the pull force. Neodymiums work optimally during direct contact; distance drastically cuts the force. Notice how rapidly the load capacity fall, when the product does not adhere flatly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Vertical hold (wall)
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 defines the approximate holding capacity needed to initiate the shifting of the magnet vertically against a vertical steel plate (assuming standard friction). This parameter varies with the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 magnet on a upright wall (e.g., a fridge), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient cause that holders slip faster than they pull off. Designing a hanger? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will slide down under a much lighter weight. Application of an anti-slip coating can effectively raise the stability.

Table 4: Material efficiency (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 thin metal plate is not enough to take in the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this magnet's power, you need a suitably thick piece of metal. The saturation effect means that on thin elements (e.g., thin profiles), the magnet holds weaker. We suggest choosing the steel dimension based on the following data.

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
Standard neodymium magnets lose power after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this product. With increasing heat, the neodymium's force momentarily lowers. Refrain from using this magnet near heat sources exceeding its safe range. Too high temperature will cause irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 25x5 / N38AH

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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 attract each other from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Planning to create a solid fastener? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
Important: Figures refer to friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
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
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 is a real danger to IT equipment as well as pacemakers. These magnets produce a field that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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
NdFeB products are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with large magnets.

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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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 emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Steel thickness impact

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

3. Temperature resistance

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

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

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

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 and environmental data
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: 010501-2026
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The offered product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø25x5 mm, guarantees the highest energy density. The MW 25x5 / N38AH component boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 7.29 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, 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 rod is indispensable in miniature devices and wherever every gram matters.
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 stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. 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 in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 25 mm and height 5 mm. 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 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. 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.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • By using a shiny layer of nickel, the element has an aesthetic look,
  • Neodymium magnets create maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • 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 freedom in designing and the capacity to adapt to unusual requirements,
  • Key role in advanced technology sectors – they are used in HDD drives, motor assemblies, medical equipment, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Furthermore, small components of these devices are able to be problematic in diagnostics 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

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 7.29 kg is a result of laboratory testing performed under standard conditions:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by specific conditions, including (from most important):
  • Gap (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Plate thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safe handling of NdFeB magnets
Warning for allergy sufferers

Studies show that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands and choose encased magnets.

Do not overheat magnets

Avoid heat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Electronic hazard

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

Powerful field

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Compass and GPS

Note: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your phone, device, and GPS.

Keep away from children

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires urgent medical intervention.

Serious injuries

Big blocks can smash fingers in a fraction of a second. Do not put your hand between two strong magnets.

Shattering risk

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Life threat

People with a pacemaker must maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Warning! Learn more about risks in the article: Safety of working with magnets.