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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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Technical specification - 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 modeling of the product - data

Presented data constitute the result of a mathematical simulation. Results rely on algorithms for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Treat these data as a supplementary guide for designers.

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 pounds
92250.0 g / 905.0 N
dangerous!
1 mm 4034 Gs
403.4 mT
86.37 kg / 190.41 pounds
86369.8 g / 847.3 N
dangerous!
2 mm 3894 Gs
389.4 mT
80.47 kg / 177.41 pounds
80469.7 g / 789.4 N
dangerous!
3 mm 3751 Gs
375.1 mT
74.67 kg / 164.62 pounds
74670.6 g / 732.5 N
dangerous!
5 mm 3461 Gs
346.1 mT
63.58 kg / 140.17 pounds
63580.6 g / 623.7 N
dangerous!
10 mm 2756 Gs
275.6 mT
40.32 kg / 88.89 pounds
40320.8 g / 395.5 N
dangerous!
15 mm 2140 Gs
214.0 mT
24.31 kg / 53.59 pounds
24308.3 g / 238.5 N
dangerous!
20 mm 1644 Gs
164.4 mT
14.34 kg / 31.61 pounds
14338.1 g / 140.7 N
dangerous!
30 mm 975 Gs
97.5 mT
5.05 kg / 11.12 pounds
5046.0 g / 49.5 N
strong
50 mm 388 Gs
38.8 mT
0.80 kg / 1.77 pounds
801.0 g / 7.9 N
safe

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

Table 3: Wall mounting (shearing) - vertical pull
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 pounds
27675.0 g / 271.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.45 kg / 40.68 pounds
18450.0 g / 181.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.23 kg / 20.34 pounds
9225.0 g / 90.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
46.13 kg / 101.69 pounds
46125.0 g / 452.5 N

Table 4: Steel thickness (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 pounds
3075.0 g / 30.2 N
1 mm
8%
7.69 kg / 16.95 pounds
7687.5 g / 75.4 N
2 mm
17%
15.37 kg / 33.90 pounds
15375.0 g / 150.8 N
3 mm
25%
23.06 kg / 50.84 pounds
23062.5 g / 226.2 N
5 mm
42%
38.44 kg / 84.74 pounds
38437.5 g / 377.1 N
10 mm
83%
76.88 kg / 169.48 pounds
76875.0 g / 754.1 N
11 mm
92%
84.56 kg / 186.43 pounds
84562.5 g / 829.6 N
12 mm
100%
92.25 kg / 203.38 pounds
92250.0 g / 905.0 N

Table 5: Thermal resistance (material behavior) - 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 pounds
92250.0 g / 905.0 N
OK
40 °C -2.2% 90.22 kg / 198.90 pounds
90220.5 g / 885.1 N
OK
60 °C -4.4% 88.19 kg / 194.43 pounds
88191.0 g / 865.2 N
80 °C -6.6% 86.16 kg / 189.95 pounds
86161.5 g / 845.2 N
100 °C -28.8% 65.68 kg / 144.80 pounds
65682.0 g / 644.3 N

Table 6: Two magnets (attraction) - field collision
MW 55x25 / N38

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

Table 7: Safety (HSE) (electronics) - 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: 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: 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 (Pc)
MW 55x25 / N38

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

Table 11: Submerged application
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. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Heat tolerance

*For standard magnets, the critical 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
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%
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: 010081-2026
Measurement Calculator
Magnet pull force

Magnetic Field

See also products

The offered product is an exceptionally strong cylinder magnet, produced from durable NdFeB material, which, at dimensions of Ø55x25 mm, guarantees maximum efficiency. The MW 55x25 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent 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 quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force 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.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 55.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority 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 (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 key parameter here is the holding force amounting to approximately 92.25 kg (force ~904.94 N), which, with such defined 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 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 diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Advantages

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They retain full power for around ten years – the drop is just ~1% (in theory),
  • Neodymium magnets are characterized by remarkably resistant to magnetic field loss caused by external magnetic fields,
  • Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
  • Magnets are characterized by very high magnetic induction on the outer layer,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • Thanks to freedom in shaping and the ability to modify to complex applications,
  • Key role in innovative solutions – they are used in magnetic memories, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnetwhat it depends on?

Breakaway force is the result of a measurement for optimal configuration, including:
  • on a block made of structural steel, optimally conducting the magnetic field
  • with a thickness no less than 10 mm
  • with an polished touching surface
  • without any clearance between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Key elements affecting lifting force

Please note that the working load will differ depending on the following factors, in order of importance:
  • Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Metal Allergy

Certain individuals have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. We recommend wear protective gloves.

Impact on smartphones

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

Serious injuries

Big blocks can break fingers instantly. Do not place your hand between two strong magnets.

ICD Warning

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Eye protection

Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them cracking into small pieces.

Danger to the youngest

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are very dangerous.

Handling guide

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Magnetic media

Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Flammability

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

Heat warning

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98