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MW 55x25 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010081

GTIN/EAN: 5906301810803

5.00

Diameter Ø

55 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

445.47 g

Magnetization Direction

↑ axial

Load capacity

92.25 kg / 904.94 N

Magnetic Induction

416.97 mT / 4170 Gs

Coating

[NiCuNi] Nickel

154.21 with VAT / pcs + price for transport

125.37 ZŁ net + 23% VAT / pcs

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Specifications along with structure of a magnet can be tested using our force calculator.

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Technical of the product - MW 55x25 / N38 - cylindrical magnet

Specification / characteristics - MW 55x25 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010081
GTIN/EAN 5906301810803
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 55 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 445.47 g
Magnetization Direction ↑ axial
Load capacity ~ ? 92.25 kg / 904.94 N
Magnetic Induction ~ ? 416.97 mT / 4170 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 55x25 / 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

Engineering analysis of the magnet - technical parameters

The following values constitute the direct effect of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MW 55x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4169 Gs
416.9 mT
92.25 kg / 203.38 lbs
92250.0 g / 905.0 N
dangerous!
1 mm 4034 Gs
403.4 mT
86.37 kg / 190.41 lbs
86369.8 g / 847.3 N
dangerous!
2 mm 3894 Gs
389.4 mT
80.47 kg / 177.41 lbs
80469.7 g / 789.4 N
dangerous!
3 mm 3751 Gs
375.1 mT
74.67 kg / 164.62 lbs
74670.6 g / 732.5 N
dangerous!
5 mm 3461 Gs
346.1 mT
63.58 kg / 140.17 lbs
63580.6 g / 623.7 N
dangerous!
10 mm 2756 Gs
275.6 mT
40.32 kg / 88.89 lbs
40320.8 g / 395.5 N
dangerous!
15 mm 2140 Gs
214.0 mT
24.31 kg / 53.59 lbs
24308.3 g / 238.5 N
dangerous!
20 mm 1644 Gs
164.4 mT
14.34 kg / 31.61 lbs
14338.1 g / 140.7 N
dangerous!
30 mm 975 Gs
97.5 mT
5.05 kg / 11.12 lbs
5046.0 g / 49.5 N
medium risk
50 mm 388 Gs
38.8 mT
0.80 kg / 1.77 lbs
801.0 g / 7.9 N
low risk

Table 2: Vertical capacity (vertical surface)
MW 55x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 18.45 kg / 40.68 lbs
18450.0 g / 181.0 N
1 mm Stal (~0.2) 17.27 kg / 38.08 lbs
17274.0 g / 169.5 N
2 mm Stal (~0.2) 16.09 kg / 35.48 lbs
16094.0 g / 157.9 N
3 mm Stal (~0.2) 14.93 kg / 32.92 lbs
14934.0 g / 146.5 N
5 mm Stal (~0.2) 12.72 kg / 28.03 lbs
12716.0 g / 124.7 N
10 mm Stal (~0.2) 8.06 kg / 17.78 lbs
8064.0 g / 79.1 N
15 mm Stal (~0.2) 4.86 kg / 10.72 lbs
4862.0 g / 47.7 N
20 mm Stal (~0.2) 2.87 kg / 6.32 lbs
2868.0 g / 28.1 N
30 mm Stal (~0.2) 1.01 kg / 2.23 lbs
1010.0 g / 9.9 N
50 mm Stal (~0.2) 0.16 kg / 0.35 lbs
160.0 g / 1.6 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 55x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.68 kg / 61.01 lbs
27675.0 g / 271.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.45 kg / 40.68 lbs
18450.0 g / 181.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.23 kg / 20.34 lbs
9225.0 g / 90.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
46.13 kg / 101.69 lbs
46125.0 g / 452.5 N

Table 4: Material efficiency (substrate influence) - power losses
MW 55x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
3.08 kg / 6.78 lbs
3075.0 g / 30.2 N
1 mm
8%
7.69 kg / 16.95 lbs
7687.5 g / 75.4 N
2 mm
17%
15.37 kg / 33.90 lbs
15375.0 g / 150.8 N
3 mm
25%
23.06 kg / 50.84 lbs
23062.5 g / 226.2 N
5 mm
42%
38.44 kg / 84.74 lbs
38437.5 g / 377.1 N
10 mm
83%
76.88 kg / 169.48 lbs
76875.0 g / 754.1 N
11 mm
92%
84.56 kg / 186.43 lbs
84562.5 g / 829.6 N
12 mm
100%
92.25 kg / 203.38 lbs
92250.0 g / 905.0 N

Table 5: Working in heat (stability) - thermal limit
MW 55x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 92.25 kg / 203.38 lbs
92250.0 g / 905.0 N
OK
40 °C -2.2% 90.22 kg / 198.90 lbs
90220.5 g / 885.1 N
OK
60 °C -4.4% 88.19 kg / 194.43 lbs
88191.0 g / 865.2 N
80 °C -6.6% 86.16 kg / 189.95 lbs
86161.5 g / 845.2 N
100 °C -28.8% 65.68 kg / 144.80 lbs
65682.0 g / 644.3 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 55x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 254.60 kg / 561.30 lbs
5 431 Gs
38.19 kg / 84.20 lbs
38190 g / 374.6 N
N/A
1 mm 246.57 kg / 543.59 lbs
8 206 Gs
36.99 kg / 81.54 lbs
36985 g / 362.8 N
221.91 kg / 489.23 lbs
~0 Gs
2 mm 238.37 kg / 525.52 lbs
8 068 Gs
35.76 kg / 78.83 lbs
35756 g / 350.8 N
214.54 kg / 472.97 lbs
~0 Gs
3 mm 230.21 kg / 507.52 lbs
7 929 Gs
34.53 kg / 76.13 lbs
34531 g / 338.7 N
207.19 kg / 456.77 lbs
~0 Gs
5 mm 214.04 kg / 471.88 lbs
7 645 Gs
32.11 kg / 70.78 lbs
32106 g / 315.0 N
192.64 kg / 424.69 lbs
~0 Gs
10 mm 175.48 kg / 386.86 lbs
6 923 Gs
26.32 kg / 58.03 lbs
26322 g / 258.2 N
157.93 kg / 348.17 lbs
~0 Gs
20 mm 111.28 kg / 245.33 lbs
5 513 Gs
16.69 kg / 36.80 lbs
16692 g / 163.8 N
100.15 kg / 220.80 lbs
~0 Gs
50 mm 23.33 kg / 51.43 lbs
2 524 Gs
3.50 kg / 7.71 lbs
3499 g / 34.3 N
20.99 kg / 46.28 lbs
~0 Gs
60 mm 13.93 kg / 30.70 lbs
1 950 Gs
2.09 kg / 4.61 lbs
2089 g / 20.5 N
12.53 kg / 27.63 lbs
~0 Gs
70 mm 8.48 kg / 18.70 lbs
1 522 Gs
1.27 kg / 2.81 lbs
1272 g / 12.5 N
7.63 kg / 16.83 lbs
~0 Gs
80 mm 5.29 kg / 11.66 lbs
1 202 Gs
0.79 kg / 1.75 lbs
793 g / 7.8 N
4.76 kg / 10.50 lbs
~0 Gs
90 mm 3.38 kg / 7.45 lbs
961 Gs
0.51 kg / 1.12 lbs
507 g / 5.0 N
3.04 kg / 6.70 lbs
~0 Gs
100 mm 2.21 kg / 4.87 lbs
777 Gs
0.33 kg / 0.73 lbs
332 g / 3.3 N
1.99 kg / 4.39 lbs
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
MW 55x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 27.5 cm
Hearing aid 10 Gs (1.0 mT) 21.5 cm
Mechanical watch 20 Gs (2.0 mT) 17.0 cm
Mobile device 40 Gs (4.0 mT) 13.0 cm
Remote 50 Gs (5.0 mT) 12.0 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm

Table 8: Dynamics (kinetic energy) - warning
MW 55x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.05 km/h
(5.01 m/s)
5.60 J
30 mm 25.98 km/h
(7.22 m/s)
11.60 J
50 mm 32.63 km/h
(9.06 m/s)
18.30 J
100 mm 45.90 km/h
(12.75 m/s)
36.21 J

Table 9: Corrosion resistance
MW 55x25 / 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)

Table 10: Construction data (Flux)
MW 55x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 101 075 Mx 1010.7 µWb
Pc Coefficient 0.55 Low (Flat)

Table 11: Physics of underwater searching
MW 55x25 / N38

Environment Effective steel pull Effect
Air (land) 92.25 kg Standard
Water (riverbed) 105.63 kg
(+13.38 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

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

2. Plate thickness effect

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55

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
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%
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: 010081-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

Other products

The offered product is a very strong cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø55x25 mm, guarantees maximum efficiency. This specific item is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 92.25 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 904.94 N with a weight of only 445.47 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø55x25), 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 Ø55x25 mm, which, at a weight of 445.47 g, makes it an element with high magnetic energy density. The value of 904.94 N means that the magnet is capable of holding a weight many times exceeding its own mass of 445.47 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 55 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 through the diameter if your project requires it.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by external magnetic fields,
  • By using a reflective layer of nickel, the element acquires an proper look,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • In view of the option of precise molding and customization to unique requirements, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Significant place in modern technologies – they are used in mass storage devices, brushless drives, precision medical tools, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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 possibility of producing threads in the magnet and complicated forms - preferred is cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

The load parameter shown represents the peak performance, recorded under laboratory conditions, specifically:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Key elements affecting lifting force

Holding efficiency is influenced by specific conditions, such as (from most important):
  • Gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin steel does not close the flux, causing part of the power to be wasted to the other side.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Material brittleness

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Medical interference

Individuals with a pacemaker should maintain an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Magnetic interference

A strong magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Electronic hazard

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Flammability

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Product not for children

Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep out of reach of kids and pets.

Crushing force

Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Thermal limits

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Immense force

Be careful. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.

Danger! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98