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MW 50x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010080

GTIN/EAN: 5906301810797

Diameter Ø

50 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

294.52 g

Magnetization Direction

↑ axial

Load capacity

70.10 kg / 687.66 N

Magnetic Induction

387.23 mT / 3872 Gs

Coating

[NiCuNi] Nickel

106.96 with VAT / pcs + price for transport

86.96 ZŁ net + 23% VAT / pcs

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Parameters and structure of a neodymium magnet can be verified on our power calculator.

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Technical parameters - MW 50x20 / N38 - cylindrical magnet

Specification / characteristics - MW 50x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010080
GTIN/EAN 5906301810797
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 50 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 294.52 g
Magnetization Direction ↑ axial
Load capacity ~ ? 70.10 kg / 687.66 N
Magnetic Induction ~ ? 387.23 mT / 3872 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 50x20 / 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 product - technical parameters

These values represent the outcome of a mathematical calculation. Results rely on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MW 50x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3872 Gs
387.2 mT
70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
crushing
1 mm 3740 Gs
374.0 mT
65.41 kg / 144.20 LBS
65408.0 g / 641.7 N
crushing
2 mm 3601 Gs
360.1 mT
60.65 kg / 133.72 LBS
60652.7 g / 595.0 N
crushing
3 mm 3459 Gs
345.9 mT
55.95 kg / 123.35 LBS
55950.5 g / 548.9 N
crushing
5 mm 3168 Gs
316.8 mT
46.94 kg / 103.47 LBS
46935.3 g / 460.4 N
crushing
10 mm 2460 Gs
246.0 mT
28.31 kg / 62.40 LBS
28306.3 g / 277.7 N
crushing
15 mm 1855 Gs
185.5 mT
16.10 kg / 35.48 LBS
16095.6 g / 157.9 N
crushing
20 mm 1384 Gs
138.4 mT
8.96 kg / 19.76 LBS
8963.2 g / 87.9 N
medium risk
30 mm 782 Gs
78.2 mT
2.86 kg / 6.31 LBS
2863.1 g / 28.1 N
medium risk
50 mm 293 Gs
29.3 mT
0.40 kg / 0.89 LBS
402.4 g / 3.9 N
weak grip

Table 2: Sliding capacity (vertical surface)
MW 50x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
1 mm Stal (~0.2) 13.08 kg / 28.84 LBS
13082.0 g / 128.3 N
2 mm Stal (~0.2) 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
3 mm Stal (~0.2) 11.19 kg / 24.67 LBS
11190.0 g / 109.8 N
5 mm Stal (~0.2) 9.39 kg / 20.70 LBS
9388.0 g / 92.1 N
10 mm Stal (~0.2) 5.66 kg / 12.48 LBS
5662.0 g / 55.5 N
15 mm Stal (~0.2) 3.22 kg / 7.10 LBS
3220.0 g / 31.6 N
20 mm Stal (~0.2) 1.79 kg / 3.95 LBS
1792.0 g / 17.6 N
30 mm Stal (~0.2) 0.57 kg / 1.26 LBS
572.0 g / 5.6 N
50 mm Stal (~0.2) 0.08 kg / 0.18 LBS
80.0 g / 0.8 N

Table 3: Wall mounting (shearing) - vertical pull
MW 50x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
21.03 kg / 46.36 LBS
21030.0 g / 206.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.02 kg / 30.91 LBS
14020.0 g / 137.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.01 kg / 15.45 LBS
7010.0 g / 68.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
35.05 kg / 77.27 LBS
35050.0 g / 343.8 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 50x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
2.34 kg / 5.15 LBS
2336.7 g / 22.9 N
1 mm
8%
5.84 kg / 12.88 LBS
5841.7 g / 57.3 N
2 mm
17%
11.68 kg / 25.76 LBS
11683.3 g / 114.6 N
3 mm
25%
17.53 kg / 38.64 LBS
17525.0 g / 171.9 N
5 mm
42%
29.21 kg / 64.39 LBS
29208.3 g / 286.5 N
10 mm
83%
58.42 kg / 128.79 LBS
58416.7 g / 573.1 N
11 mm
92%
64.26 kg / 141.67 LBS
64258.3 g / 630.4 N
12 mm
100%
70.10 kg / 154.54 LBS
70100.0 g / 687.7 N

Table 5: Thermal stability (stability) - power drop
MW 50x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 70.10 kg / 154.54 LBS
70100.0 g / 687.7 N
OK
40 °C -2.2% 68.56 kg / 151.14 LBS
68557.8 g / 672.6 N
OK
60 °C -4.4% 67.02 kg / 147.74 LBS
67015.6 g / 657.4 N
80 °C -6.6% 65.47 kg / 144.34 LBS
65473.4 g / 642.3 N
100 °C -28.8% 49.91 kg / 110.04 LBS
49911.2 g / 489.6 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 50x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 181.46 kg / 400.06 LBS
5 255 Gs
27.22 kg / 60.01 LBS
27220 g / 267.0 N
N/A
1 mm 175.47 kg / 386.84 LBS
7 615 Gs
26.32 kg / 58.03 LBS
26321 g / 258.2 N
157.92 kg / 348.16 LBS
~0 Gs
2 mm 169.32 kg / 373.28 LBS
7 480 Gs
25.40 kg / 55.99 LBS
25398 g / 249.2 N
152.39 kg / 335.96 LBS
~0 Gs
3 mm 163.16 kg / 359.70 LBS
7 343 Gs
24.47 kg / 53.96 LBS
24474 g / 240.1 N
146.84 kg / 323.73 LBS
~0 Gs
5 mm 150.90 kg / 332.67 LBS
7 061 Gs
22.63 kg / 49.90 LBS
22634 g / 222.0 N
135.81 kg / 299.40 LBS
~0 Gs
10 mm 121.50 kg / 267.86 LBS
6 336 Gs
18.22 kg / 40.18 LBS
18225 g / 178.8 N
109.35 kg / 241.07 LBS
~0 Gs
20 mm 73.28 kg / 161.54 LBS
4 921 Gs
10.99 kg / 24.23 LBS
10991 g / 107.8 N
65.95 kg / 145.39 LBS
~0 Gs
50 mm 12.99 kg / 28.63 LBS
2 071 Gs
1.95 kg / 4.29 LBS
1948 g / 19.1 N
11.69 kg / 25.76 LBS
~0 Gs
60 mm 7.41 kg / 16.34 LBS
1 565 Gs
1.11 kg / 2.45 LBS
1112 g / 10.9 N
6.67 kg / 14.71 LBS
~0 Gs
70 mm 4.35 kg / 9.58 LBS
1 198 Gs
0.65 kg / 1.44 LBS
652 g / 6.4 N
3.91 kg / 8.62 LBS
~0 Gs
80 mm 2.62 kg / 5.78 LBS
931 Gs
0.39 kg / 0.87 LBS
393 g / 3.9 N
2.36 kg / 5.20 LBS
~0 Gs
90 mm 1.63 kg / 3.59 LBS
734 Gs
0.24 kg / 0.54 LBS
245 g / 2.4 N
1.47 kg / 3.23 LBS
~0 Gs
100 mm 1.04 kg / 2.30 LBS
587 Gs
0.16 kg / 0.34 LBS
156 g / 1.5 N
0.94 kg / 2.07 LBS
~0 Gs

Table 7: Protective zones (implants) - warnings
MW 50x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 19.0 cm
Timepiece 20 Gs (2.0 mT) 15.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 11.5 cm
Car key 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MW 50x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.09 km/h
(5.30 m/s)
4.14 J
30 mm 27.63 km/h
(7.67 m/s)
8.67 J
50 mm 34.92 km/h
(9.70 m/s)
13.85 J
100 mm 49.21 km/h
(13.67 m/s)
27.51 J

Table 9: Coating parameters (durability)
MW 50x20 / 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 50x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 78 540 Mx 785.4 µWb
Pc Coefficient 0.50 Low (Flat)

Table 11: Hydrostatics and buoyancy
MW 50x20 / N38

Environment Effective steel pull Effect
Air (land) 70.10 kg Standard
Water (riverbed) 80.26 kg
(+10.16 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.50

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 and environmental data
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%
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: 010080-2026
Measurement Calculator
Magnet pull force

Field Strength

Other offers

The presented product is an exceptionally strong cylinder magnet, made from modern NdFeB material, which, at dimensions of Ø50x20 mm, guarantees the highest energy density. The MW 50x20 / N38 model is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 70.10 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, 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 maximum induction on a small surface counts. Thanks to the pull force of 687.66 N with a weight of only 294.52 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 immediate cracking of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough 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 (Ø50x20), 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 50 mm and height 20 mm. The value of 687.66 N means that the magnet is capable of holding a weight many times exceeding its own mass of 294.52 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 20 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain attractive force for almost ten years – the loss is just ~1% (according to analyses),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the smooth finish, the layer of nickel, gold-plated, or silver gives an aesthetic appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of detailed shaping and optimizing to atypical needs,
  • Wide application in innovative solutions – they are commonly used in HDD drives, motor assemblies, advanced medical instruments, also other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose 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 durability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum magnetic pulling forcewhat it depends on?

The load parameter shown refers to the maximum value, recorded under ideal test conditions, meaning:
  • with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Effective lifting capacity impacted by specific conditions, mainly (from priority):
  • Gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Warnings
Mechanical processing

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Demagnetization risk

Control the heat. Heating the magnet to high heat will ruin its properties and strength.

Medical interference

For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Do not underestimate power

Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and respect their power.

Impact on smartphones

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.

Product not for children

Strictly keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are very dangerous.

Data carriers

Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Beware of splinters

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them cracking into small pieces.

Bone fractures

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?