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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 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

Technical modeling of the magnet - data

These values represent the outcome of a engineering calculation. Values are based on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - 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 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
strong
50 mm 388 Gs
38.8 mT
0.80 kg / 1.77 LBS
801.0 g / 7.9 N
safe

Table 2: Vertical load (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: Wall mounting (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) - 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: Thermal stability (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 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) - forces in the system
MW 55x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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: Protective zones (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
Timepiece 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: Collisions (kinetic energy) - collision effects
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 (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: 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 only a fraction of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, 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
Elemental analysis
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
Magnet pull force

Magnetic Induction

Other products

The presented product is an extremely powerful cylinder magnet, manufactured from modern NdFeB material, which, with dimensions of Ø55x25 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 92.25 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 904.94 N with a weight of only 445.47 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, 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 industry, anaerobic resins are used, which are safe for nickel 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 in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 55 mm and height 25 mm. 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 protects the surface 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. 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 diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They do not lose power, even during approximately 10 years – the drop in strength is only ~1% (according to tests),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By applying a smooth coating of silver, the element gains an professional look,
  • Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed machining and optimizing to individual needs,
  • Huge importance in future technologies – they are used in hard drives, electric drive systems, medical devices, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complicated forms - recommended is cover - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these magnets can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The load parameter shown represents the maximum value, recorded under optimal environment, meaning:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • with zero gap (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

It is worth knowing that the application force may be lower subject to the following factors, in order of importance:
  • Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Dust explosion hazard

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

Immense force

Use magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.

Magnet fragility

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Life threat

Patients with a ICD must keep an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.

Keep away from electronics

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Permanent damage

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Hand protection

Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Protect data

Very strong magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Adults only

These products are not suitable for play. Swallowing several magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Allergic reactions

Certain individuals experience a sensitization to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in a rash. We recommend use protective gloves.

Security! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98