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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN/EAN: 5906301810438

5.00
Load capacity 6.93 kg / 67.95 N Magnetic Induction 277.16 mT / 2772 Gs
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical details »

5.56 zł with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data - 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

Technical simulation of the assembly - technical parameters

These information constitute the outcome of a physical analysis. Results were calculated on models for the material Nd2Fe14B. Real-world parameters may differ. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
MW 20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2771 Gs
277.1 mT
 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
 warning
1 mm 2573 Gs
257.3 mT
 5.97 kg / 13.17 lbs
5975.0 g / 58.6 N
 warning
2 mm 2340 Gs
234.0 mT
 4.94 kg / 10.89 lbs
4940.1 g / 48.5 N
 warning
3 mm 2092 Gs
209.2 mT
 3.95 kg / 8.70 lbs
3948.3 g / 38.7 N
 warning
5 mm 1611 Gs
161.1 mT
 2.34 kg / 5.17 lbs
2343.4 g / 23.0 N
 warning
10 mm 775 Gs
77.5 mT
 0.54 kg / 1.19 lbs
541.6 g / 5.3 N
 safe
15 mm 387 Gs
38.7 mT
 0.13 kg / 0.30 lbs
135.0 g / 1.3 N
 safe
20 mm 211 Gs
21.1 mT
 0.04 kg / 0.09 lbs
40.2 g / 0.4 N
 safe
30 mm 80 Gs
8.0 mT
 0.01 kg / 0.01 lbs
5.7 g / 0.1 N
 safe
50 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 safe
Magnetic force weakens sharply per each millimeter of distance. Remember that even the smallest gap (e.g., dirt, varnish, rust) strongly weakens the grip. Magnetic products hold strongest in perfect adhesion; distance weakens the force. Analyze how quickly the parameters plummet, when the magnet does not touch tightly to the steel surface. When planning the assembly, eliminate redundant distances.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.39 kg / 3.06 lbs
1386.0 g / 13.6 N
1 mm Stal (~0.2) 1.19 kg / 2.63 lbs
1194.0 g / 11.7 N
2 mm Stal (~0.2) 0.99 kg / 2.18 lbs
988.0 g / 9.7 N
3 mm Stal (~0.2) 0.79 kg / 1.74 lbs
790.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 lbs
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 lbs
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data indicates the theoretical holding capacity necessary to cause the downward movement of the magnet downwards against a vertical metal surface (assuming typical friction). This parameter depends on the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MW 20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.08 kg / 4.58 lbs
2079.0 g / 20.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.39 kg / 3.06 lbs
1386.0 g / 13.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.69 kg / 1.53 lbs
693.0 g / 6.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.47 kg / 7.64 lbs
3465.0 g / 34.0 N
When hanging a holder on a upright wall (e.g., a board), it will maintain just about 20%-30% of its nominal power. Gravity and a weak degree of grip cause that holders slip easier than they pop off the substrate. Designing a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter cargo. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.69 kg / 1.53 lbs
693.0 g / 6.8 N
1 mm
25%
 1.73 kg / 3.82 lbs
1732.5 g / 17.0 N
2 mm
50%
 3.47 kg / 7.64 lbs
3465.0 g / 34.0 N
3 mm
75%
 5.20 kg / 11.46 lbs
5197.5 g / 51.0 N
5 mm
100%
 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
10 mm
100%
 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
11 mm
100%
 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
12 mm
100%
 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a weak sheet, the field will pass right through and the attraction force will be weaker. To achieve 100% of this neodymium's power, you need a suitably thick backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MW 20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.93 kg / 15.28 lbs
6930.0 g / 68.0 N
 OK
40 °C -2.2% 6.78 kg / 14.94 lbs
6777.5 g / 66.5 N
 OK
60 °C -4.4% 6.63 kg / 14.61 lbs
6625.1 g / 65.0 N
80 °C -6.6% 6.47 kg / 14.27 lbs
6472.6 g / 63.5 N
100 °C -28.8% 4.93 kg / 10.88 lbs
4934.2 g / 48.4 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently destroy this product. With increasing heat, the neodymium's capacity briefly decreases. Avoid using this magnet close to heaters higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 14.87 kg / 32.79 lbs
4 380 Gs
2.23 kg / 4.92 lbs
2231 g / 21.9 N
 N/A
1 mm 13.89 kg / 30.63 lbs
5 357 Gs
2.08 kg / 4.59 lbs
2084 g / 20.4 N
 12.50 kg / 27.57 lbs
~0 Gs
2 mm 12.82 kg / 28.27 lbs
5 146 Gs
1.92 kg / 4.24 lbs
1923 g / 18.9 N
 11.54 kg / 25.44 lbs
~0 Gs
3 mm 11.71 kg / 25.82 lbs
4 918 Gs
1.76 kg / 3.87 lbs
1757 g / 17.2 N
 10.54 kg / 23.24 lbs
~0 Gs
5 mm 9.51 kg / 20.97 lbs
4 433 Gs
1.43 kg / 3.15 lbs
1427 g / 14.0 N
 8.56 kg / 18.88 lbs
~0 Gs
10 mm 5.03 kg / 11.09 lbs
3 223 Gs
0.75 kg / 1.66 lbs
754 g / 7.4 N
 4.53 kg / 9.98 lbs
~0 Gs
20 mm 1.16 kg / 2.56 lbs
1 549 Gs
0.17 kg / 0.38 lbs
174 g / 1.7 N
 1.05 kg / 2.31 lbs
~0 Gs
50 mm 0.03 kg / 0.07 lbs
251 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
60 mm 0.01 kg / 0.03 lbs
159 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
70 mm 0.01 kg / 0.01 lbs
107 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.01 lbs
75 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
54 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
41 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a further horizon of action. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is massive. The repulsion force is marginally weaker than the connection force, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Calculations demonstrate shear force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - 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
A strong magnetic field is a serious hazard to electronic devices and medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.91 km/h
(6.92 m/s)
 0.28 J
30 mm 25.76 km/h
(7.16 m/s)
 0.30 J
50 mm 25.78 km/h
(7.16 m/s)
 0.30 J
100 mm 25.78 km/h
(7.16 m/s)
 0.30 J
NdFeB products are delicate – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Surface protection spec
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MW 20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 675 Mx 96.7 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value passing through the pole surface. Essential parameter for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Warning: On a vertical wall, the magnet holds merely ~20% of its max power.

2. Steel saturation

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

3. Temperature resistance

*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) = 0.35

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.

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%

Sustainability

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: 010044-2026
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The presented product is an exceptionally strong cylindrical magnet, made from advanced NdFeB material, which, with dimensions of Ø20x5 mm, guarantees the highest energy density. The MW 20x5 / N38 model is characterized by a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 6.93 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 67.95 N with a weight of only 11.78 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, 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 automation, specialized industrial adhesives 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 industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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.
This model is characterized by dimensions Ø20x5 mm, which, at a weight of 11.78 g, makes it an element with high magnetic energy density. The value of 67.95 N means that the magnet is capable of holding a weight many times exceeding its own mass of 11.78 g. 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 5 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 diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (theoretically),
  • They possess excellent resistance to magnetic field loss as a result of external magnetic sources,
  • By covering with a lustrous layer of nickel, the element gains an elegant look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Considering the ability of precise shaping and adaptation to specialized projects, neodymium magnets can be modeled in a wide range of geometric configurations, which makes them more universal,
  • Versatile presence in high-tech industry – they are utilized in HDD drives, brushless drives, medical equipment, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mount.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to be problematic in diagnostics 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 contributes to it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • characterized by smoothness
  • under conditions of no distance (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

Holding efficiency is influenced by working environment parameters, mainly (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin plate does not close the flux, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Allergic reactions

Certain individuals suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching can result in dermatitis. It is best to use safety gloves.

Caution required

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

Risk of cracking

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

This is not a toy

Always keep magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Keep away from computers

Intense magnetic fields can destroy records on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Pinching danger

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Warning for heart patients

Individuals with a pacemaker must maintain an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.

GPS and phone interference

Note: rare earth magnets generate a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.

Mechanical processing

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

Attention! More info about hazards in the article: Magnet Safety Guide.