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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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Detailed specification - 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

Physical analysis of the product - data

These information represent the direct effect of a physical simulation. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - 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
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
low risk

Table 2: Sliding hold (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 (sliding) - 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: Two magnets (attraction) - field range
MW 50x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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: Safety (HSE) (electronics) - 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
Phone / Smartphone 40 Gs (4.0 mT) 11.5 cm
Remote 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 (cracking risk) - 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: Electrical data (Flux)
MW 50x20 / N38

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

Table 11: Physics of underwater searching
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

*For standard magnets, 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
Pulling force

Magnetic Induction

See more proposals

The offered product is a very strong cylinder magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø50x20 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 70.10 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient filters, where field concentration 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 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 precision 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 NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger 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 lifting capacity amounting to approximately 70.10 kg (force ~687.66 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder 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 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 diametrically if your project requires it.

Strengths and weaknesses of neodymium magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the metallic finish, the plating of nickel, gold, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of flexible forming and adaptation to custom solutions, neodymium magnets can be produced in a broad palette of shapes and sizes, which amplifies use scope,
  • Fundamental importance in high-tech industry – they are used in magnetic memories, electric motors, advanced medical instruments, and modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting capacity of the magnetwhat it depends on?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:
  • using a plate made of high-permeability steel, functioning as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Holding efficiency is affected by specific conditions, such as (from priority):
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Base massiveness – too thin plate does not accept the full field, causing part of the flux to be lost to the other side.
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
Power loss in heat

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Choking Hazard

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

Life threat

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Physical harm

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

Skin irritation risks

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Shattering risk

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Safe operation

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Data carriers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Machining danger

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Magnetic interference

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Security! Need more info? Read our article: Are neodymium magnets dangerous?