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MW 55x25 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010081

GTIN/EAN: 5906301810803

5.00
Load capacity 92.25 kg / 904.94 N Magnetic Induction 416.97 mT / 4170 Gs
Diameter Ø
55 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
445.47 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

125.37net / pcs

154.21 zł with VAT (23% VAT) / pcs

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Gross
price from 1 pcs
125.37 zł
154.21 zł
price from 5 pcs
117.85 zł
144.95 zł
price from 20 pcs
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135.70 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical parameters - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 modeling of the product - report

These information represent the result of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - 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
critical level
1 mm 4034 Gs
403.4 mT
86.37 kg / 190.41 LBS
86369.8 g / 847.3 N
critical level
2 mm 3894 Gs
389.4 mT
80.47 kg / 177.41 LBS
80469.7 g / 789.4 N
critical level
3 mm 3751 Gs
375.1 mT
74.67 kg / 164.62 LBS
74670.6 g / 732.5 N
critical level
5 mm 3461 Gs
346.1 mT
63.58 kg / 140.17 LBS
63580.6 g / 623.7 N
critical level
10 mm 2756 Gs
275.6 mT
40.32 kg / 88.89 LBS
40320.8 g / 395.5 N
critical level
15 mm 2140 Gs
214.0 mT
24.31 kg / 53.59 LBS
24308.3 g / 238.5 N
critical level
20 mm 1644 Gs
164.4 mT
14.34 kg / 31.61 LBS
14338.1 g / 140.7 N
critical level
30 mm 975 Gs
97.5 mT
5.05 kg / 11.12 LBS
5046.0 g / 49.5 N
warning
50 mm 388 Gs
38.8 mT
0.80 kg / 1.77 LBS
801.0 g / 7.9 N
weak grip

Table 2: Shear hold (wall)
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: Wall mounting (shearing) - 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: Steel thickness (saturation) - sheet metal selection
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 (material behavior) - power drop
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: Two magnets (attraction) - field collision
MW 55x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Safety (HSE) (implants) - warnings
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
Phone / Smartphone 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: Impact energy (cracking risk) - warning
MW 55x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.19 km/h
(5.33 m/s)
6.33 J
30 mm 23.74 km/h
(6.59 m/s)
9.68 J
50 mm 24.27 km/h
(6.74 m/s)
10.12 J
100 mm 24.39 km/h
(6.78 m/s)
10.23 J

Table 9: Coating parameters (durability)
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: Electrical 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: Underwater work (magnet fishing)
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Vertical hold

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) severely weakens 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) = 0.55

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.

Engineering data and GPSR

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%

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: 010081-2026
Quick Unit Converter

Force (pull)


Magnetic Induction

Other offers

The presented product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø55x25 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet 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 shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 904.94 N with a weight of only 445.47 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 55.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives 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 a great economic balance and operational stability. 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 available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø55x25 mm, which, at a weight of 445.47 g, makes it an element with impressive 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 oxidation, 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. 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

Besides their stability, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • They do not lose their magnetic properties even under strong external field,
  • A magnet with a smooth nickel surface has an effective appearance,
  • Magnets possess extremely high magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in designing and the ability to customize to client solutions,
  • Key role in electronics industry – they find application in magnetic memories, electromotive mechanisms, diagnostic systems, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Weaknesses

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat it depends on?

The load parameter shown refers to the limit force, recorded under optimal environment, namely:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Real force impacted by specific conditions, including (from priority):
  • Air gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic properties and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Bone fractures

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Nickel coating and allergies

It is widely known that nickel (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands and opt for versions in plastic housing.

Implant safety

Individuals with a pacemaker must keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Fire warning

Machining of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Eye protection

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into shards.

Power loss in heat

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

Powerful field

Use magnets consciously. Their immense force can shock even experienced users. Stay alert and do not underestimate their force.

Compass and GPS

GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Product not for children

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Warning! Need more info? Check our post: Why are neodymium magnets dangerous?