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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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Force as well as structure of magnetic components can be estimated using our modular calculator.

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Technical of the product - 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 data represent the outcome of a mathematical calculation. Results rely on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
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
dangerous!
1 mm 3740 Gs
374.0 mT
65.41 kg / 144.20 lbs
65408.0 g / 641.7 N
dangerous!
2 mm 3601 Gs
360.1 mT
60.65 kg / 133.72 lbs
60652.7 g / 595.0 N
dangerous!
3 mm 3459 Gs
345.9 mT
55.95 kg / 123.35 lbs
55950.5 g / 548.9 N
dangerous!
5 mm 3168 Gs
316.8 mT
46.94 kg / 103.47 lbs
46935.3 g / 460.4 N
dangerous!
10 mm 2460 Gs
246.0 mT
28.31 kg / 62.40 lbs
28306.3 g / 277.7 N
dangerous!
15 mm 1855 Gs
185.5 mT
16.10 kg / 35.48 lbs
16095.6 g / 157.9 N
dangerous!
20 mm 1384 Gs
138.4 mT
8.96 kg / 19.76 lbs
8963.2 g / 87.9 N
warning
30 mm 782 Gs
78.2 mT
2.86 kg / 6.31 lbs
2863.1 g / 28.1 N
warning
50 mm 293 Gs
29.3 mT
0.40 kg / 0.89 lbs
402.4 g / 3.9 N
safe

Table 2: Slippage hold (wall)
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: Vertical assembly (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) - power losses
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: Working in heat (material behavior) - thermal limit
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: Two magnets (repulsion) - field range
MW 50x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Safety (HSE) (implants) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 15.0 cm
Mobile device 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: Dynamics (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: Surface protection spec
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: Electrical 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: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, the safety 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.

Engineering data and GPSR
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
Quick Unit Converter
Force (pull)

Magnetic Field

Other deals

The presented product is a very strong cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø50x20 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 70.10 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields 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 filters, where maximum induction on a small surface counts. Thanks to the high power of 687.66 N with a weight of only 294.52 g, this rod is indispensable in miniature devices 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 professional component. 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.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 warehouse.
This model is characterized by dimensions Ø50x20 mm, which, at a weight of 294.52 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 70.10 kg (force ~687.66 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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. 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even over around 10 years – the decrease in power is only ~1% (theoretically),
  • They are resistant to demagnetization induced by external disturbances,
  • A magnet with a shiny nickel surface has better aesthetics,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in forming and the capacity to adapt to individual projects,
  • Wide application in modern technologies – they serve a role in data components, electric drive systems, advanced medical instruments, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Highest magnetic holding forcewhat it depends on?

The lifting capacity listed is a measurement result executed under standard conditions:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Determinants of lifting force in real conditions

Bear in mind that the magnet holding will differ subject to elements below, starting with the most relevant:
  • Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Load vector – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
  • Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Impact on smartphones

A strong magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.

Operating temperature

Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

Fragile material

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them breaking into shards.

Medical interference

For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Immense force

Be careful. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.

Fire risk

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Electronic hazard

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Choking Hazard

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Metal Allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and use protective gear.

Physical harm

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

Danger! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98