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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 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

Technical simulation of the product - report

The following data constitute the result of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual parameters may differ. Use these data as a preliminary roadmap during assembly planning.

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

Table 2: Slippage 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 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: Vertical assembly (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 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: Material efficiency (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 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 (stability) - resistance threshold
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: Magnet-Magnet interaction (repulsion) - field range
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 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: Hazards (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
Car key 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 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 (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: Hydrostatics and buoyancy
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%
Corrosion 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

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

2. Plate thickness effect

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

3. Thermal stability

*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.

Technical specification and ecology
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
Magnet Unit Converter
Pulling force

Magnetic Field

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This product is a very strong rod magnet, composed of durable NdFeB material, which, with dimensions of Ø55x25 mm, guarantees optimal power. The MW 55x25 / N38 model boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 92.25 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing 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 pull force of 904.94 N with a weight of only 445.47 g, this rod is indispensable in electronics 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 epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in automation 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 available off-the-shelf in our store.
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 power of the NdFeB material. 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 most desirable 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 as well as cons of rare earth magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
  • In other words, due to the reflective surface of gold, the element gains visual value,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed machining as well as adjusting to precise conditions,
  • Fundamental importance in advanced technology sectors – they find application in computer drives, drive modules, precision medical tools, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making nuts in the magnet and complex forms - preferred is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to complicate diagnosis 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

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The declared magnet strength represents the limit force, measured under laboratory conditions, meaning:
  • on a block made of structural steel, optimally conducting the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

It is worth knowing that the working load will differ subject to the following factors, starting with the most relevant:
  • Clearance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Heat sensitivity

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Powerful field

Handle magnets consciously. Their powerful strength can surprise even experienced users. Stay alert and respect their force.

Eye protection

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

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

Crushing risk

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Compass and GPS

A strong magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Flammability

Dust created during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Sensitization to coating

It is widely known that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands and opt for coated magnets.

Choking Hazard

Adult use only. Small elements can be swallowed, leading to severe trauma. Store out of reach of kids and pets.

Health Danger

Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98