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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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Weight as well as structure of a neodymium magnet can be calculated using our online calculation tool.

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Technical details - 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

Physical modeling of the product - technical parameters

The following values constitute the outcome of a physical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a reference point during assembly planning.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 4169 Gs
416.9 mT
92.25 kg / 92250.0 g
905.0 N
critical level
1 mm 4034 Gs
403.4 mT
86.37 kg / 86369.8 g
847.3 N
critical level
2 mm 3894 Gs
389.4 mT
80.47 kg / 80469.7 g
789.4 N
critical level
3 mm 3751 Gs
375.1 mT
74.67 kg / 74670.6 g
732.5 N
critical level
5 mm 3461 Gs
346.1 mT
63.58 kg / 63580.6 g
623.7 N
critical level
10 mm 2756 Gs
275.6 mT
40.32 kg / 40320.8 g
395.5 N
critical level
15 mm 2140 Gs
214.0 mT
24.31 kg / 24308.3 g
238.5 N
critical level
20 mm 1644 Gs
164.4 mT
14.34 kg / 14338.1 g
140.7 N
critical level
30 mm 975 Gs
97.5 mT
5.05 kg / 5046.0 g
49.5 N
warning
50 mm 388 Gs
38.8 mT
0.80 kg / 801.0 g
7.9 N
safe

Table 2: Vertical force (wall)
MW 55x25 / N38

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

Table 3: Wall mounting (shearing) - vertical pull
MW 55x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.68 kg / 27675.0 g
271.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.45 kg / 18450.0 g
181.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.23 kg / 9225.0 g
90.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
46.13 kg / 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)
0.5 mm
3%
3.08 kg / 3075.0 g
30.2 N
1 mm
8%
7.69 kg / 7687.5 g
75.4 N
2 mm
17%
15.37 kg / 15375.0 g
150.8 N
5 mm
42%
38.44 kg / 38437.5 g
377.1 N
10 mm
83%
76.88 kg / 76875.0 g
754.1 N

Table 5: Thermal stability (stability) - power drop
MW 55x25 / N38

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

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 55x25 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 254.60 kg / 254602 g
2497.6 N
5 431 Gs
N/A
1 mm 246.57 kg / 246567 g
2418.8 N
8 206 Gs
221.91 kg / 221911 g
2176.9 N
~0 Gs
2 mm 238.37 kg / 238373 g
2338.4 N
8 068 Gs
214.54 kg / 214536 g
2104.6 N
~0 Gs
3 mm 230.21 kg / 230207 g
2258.3 N
7 929 Gs
207.19 kg / 207186 g
2032.5 N
~0 Gs
5 mm 214.04 kg / 214042 g
2099.8 N
7 645 Gs
192.64 kg / 192638 g
1889.8 N
~0 Gs
10 mm 175.48 kg / 175477 g
1721.4 N
6 923 Gs
157.93 kg / 157929 g
1549.3 N
~0 Gs
20 mm 111.28 kg / 111282 g
1091.7 N
5 513 Gs
100.15 kg / 100154 g
982.5 N
~0 Gs
50 mm 23.33 kg / 23326 g
228.8 N
2 524 Gs
20.99 kg / 20994 g
205.9 N
~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: Impact energy (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: Surface protection spec
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: 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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains just a fraction of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

*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

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.

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%
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: 010081-2025
Measurement Calculator
Force (pull)

Field Strength

Other proposals

The presented product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø55x25 mm, guarantees maximum efficiency. The MW 55x25 / N38 component boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 92.25 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where field concentration 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 every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional 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 external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 25 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 as well as cons of Nd2Fe14B magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • Their strength is durable, and after approximately ten years it decreases only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties due to external fields,
  • Thanks to the metallic finish, the plating of nickel, gold, or silver-plated gives an aesthetic appearance,
  • Magnets are distinguished by maximum magnetic induction on the surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to the ability of accurate forming and adaptation to individualized projects, neodymium magnets can be manufactured in a wide range of shapes and sizes, which expands the range of possible applications,
  • Key role in modern industrial fields – they are used in HDD drives, motor assemblies, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating nuts in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a measurement result executed under the following configuration:
  • using a sheet made of low-carbon steel, functioning as a circuit closing element
  • whose thickness is min. 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under axial force direction (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

It is worth knowing that the magnet holding may be lower subject to elements below, in order of importance:
  • Clearance – existence of any layer (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate does not close the flux, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets
Keep away from children

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.

Allergy Warning

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness happens, immediately stop handling magnets and wear gloves.

Medical interference

For implant holders: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Caution required

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

Keep away from computers

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Magnets are brittle

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them breaking into shards.

Bodily injuries

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Demagnetization risk

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

Precision electronics

An intense magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Dust explosion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Caution! 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