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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN/EAN: 5906301810438

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

6.93 kg / 67.95 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

5.56 with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

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Technical details - MW 20x5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010044
GTIN/EAN 5906301810438
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 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.78 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.93 kg / 67.95 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x5 / 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

Engineering modeling of the product - data

The following data constitute the outcome of a mathematical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - interaction chart
MW 20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2771 Gs
277.1 mT
6.93 kg / 6930.0 g
68.0 N
warning
1 mm 2573 Gs
257.3 mT
5.97 kg / 5975.0 g
58.6 N
warning
2 mm 2340 Gs
234.0 mT
4.94 kg / 4940.1 g
48.5 N
warning
3 mm 2092 Gs
209.2 mT
3.95 kg / 3948.3 g
38.7 N
warning
5 mm 1611 Gs
161.1 mT
2.34 kg / 2343.4 g
23.0 N
warning
10 mm 775 Gs
77.5 mT
0.54 kg / 541.6 g
5.3 N
low risk
15 mm 387 Gs
38.7 mT
0.13 kg / 135.0 g
1.3 N
low risk
20 mm 211 Gs
21.1 mT
0.04 kg / 40.2 g
0.4 N
low risk
30 mm 80 Gs
8.0 mT
0.01 kg / 5.7 g
0.1 N
low risk
50 mm 20 Gs
2.0 mT
0.00 kg / 0.4 g
0.0 N
low risk

Table 2: Shear capacity (vertical surface)
MW 20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 1.39 kg / 1386.0 g
13.6 N
1 mm Stal (~0.2) 1.19 kg / 1194.0 g
11.7 N
2 mm Stal (~0.2) 0.99 kg / 988.0 g
9.7 N
3 mm Stal (~0.2) 0.79 kg / 790.0 g
7.7 N
5 mm Stal (~0.2) 0.47 kg / 468.0 g
4.6 N
10 mm Stal (~0.2) 0.11 kg / 108.0 g
1.1 N
15 mm Stal (~0.2) 0.03 kg / 26.0 g
0.3 N
20 mm Stal (~0.2) 0.01 kg / 8.0 g
0.1 N
30 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MW 20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.08 kg / 2079.0 g
20.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.39 kg / 1386.0 g
13.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.69 kg / 693.0 g
6.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.47 kg / 3465.0 g
34.0 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 20x5 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.69 kg / 693.0 g
6.8 N
1 mm
25%
1.73 kg / 1732.5 g
17.0 N
2 mm
50%
3.47 kg / 3465.0 g
34.0 N
5 mm
100%
6.93 kg / 6930.0 g
68.0 N
10 mm
100%
6.93 kg / 6930.0 g
68.0 N

Table 5: Thermal stability (stability) - resistance threshold
MW 20x5 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 6.93 kg / 6930.0 g
68.0 N
OK
40 °C -2.2% 6.78 kg / 6777.5 g
66.5 N
OK
60 °C -4.4% 6.63 kg / 6625.1 g
65.0 N
80 °C -6.6% 6.47 kg / 6472.6 g
63.5 N
100 °C -28.8% 4.93 kg / 4934.2 g
48.4 N

Table 6: Two magnets (repulsion) - forces in the system
MW 20x5 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 14.87 kg / 14871 g
145.9 N
4 380 Gs
N/A
1 mm 13.89 kg / 13893 g
136.3 N
5 357 Gs
12.50 kg / 12504 g
122.7 N
~0 Gs
2 mm 12.82 kg / 12822 g
125.8 N
5 146 Gs
11.54 kg / 11540 g
113.2 N
~0 Gs
3 mm 11.71 kg / 11713 g
114.9 N
4 918 Gs
10.54 kg / 10542 g
103.4 N
~0 Gs
5 mm 9.51 kg / 9513 g
93.3 N
4 433 Gs
8.56 kg / 8562 g
84.0 N
~0 Gs
10 mm 5.03 kg / 5029 g
49.3 N
3 223 Gs
4.53 kg / 4526 g
44.4 N
~0 Gs
20 mm 1.16 kg / 1162 g
11.4 N
1 549 Gs
1.05 kg / 1046 g
10.3 N
~0 Gs
50 mm 0.03 kg / 30 g
0.3 N
251 Gs
0.03 kg / 27 g
0.3 N
~0 Gs

Table 7: Hazards (electronics) - warnings
MW 20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Collisions (cracking risk) - collision effects
MW 20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.63 km/h
(7.12 m/s)
0.30 J
30 mm 42.39 km/h
(11.77 m/s)
0.82 J
50 mm 54.70 km/h
(15.19 m/s)
1.36 J
100 mm 77.35 km/h
(21.49 m/s)
2.72 J

Table 9: Coating parameters (durability)
MW 20x5 / 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 20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 675 Mx 96.7 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Physics of underwater searching
MW 20x5 / N38

Environment Effective steel pull Effect
Air (land) 6.93 kg Standard
Water (riverbed) 7.93 kg
(+1.00 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. Vertical hold

*Caution: On a vertical surface, the magnet holds just ~20% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.35

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 specification and ecology
Material specification
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: 010044-2025
Magnet Unit Converter
Magnet pull force

Magnetic Induction

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This product is a very strong cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø20x5 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 6.93 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 67.95 N with a weight of only 11.78 g, this rod is indispensable in electronics and wherever low weight is crucial.
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., 20.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 6.93 kg (force ~67.95 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 5 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the aesthetic layer of nickel, the element is aesthetically pleasing,
  • Magnets possess impressive magnetic induction on the outer side,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of custom forming and optimizing to defined needs,
  • Significant place in advanced technology sectors – they find application in data components, electric motors, diagnostic systems, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

What to avoid - cons of neodymium magnets: tips and applications.
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

The load parameter shown represents the peak performance, obtained under optimal environment, specifically:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • with direct contact (no coatings)
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

Determinants of lifting force in real conditions

In practice, the actual lifting capacity is determined by several key aspects, presented from most significant:
  • Distance (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Angle of force application – highest force is reached only during perpendicular pulling. The shear force of the magnet along the surface is usually many times smaller (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 – the best choice is high-permeability steel. Cast iron may attract less.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

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

Warnings
Allergy Warning

A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in skin redness. We strongly advise use protective gloves.

Adults only

NdFeB magnets are not suitable for play. Swallowing a few magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and requires urgent medical intervention.

Beware of splinters

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

Pinching danger

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

Respect the power

Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.

Operating temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Magnetic media

Equipment safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Fire risk

Dust generated during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

GPS Danger

An intense magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.

Implant safety

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Important! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98