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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

technical specifications »

5.56 ZŁ with VAT / pcs + price for transport

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Parameters as well as appearance of a neodymium magnet can be estimated using our power calculator.

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Technical - 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 simulation of the magnet - technical parameters

These values constitute the outcome of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
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 pounds
6930.0 g / 68.0 N
 strong
1 mm 2573 Gs
257.3 mT
 5.97 kg / 13.17 pounds
5975.0 g / 58.6 N
 strong
2 mm 2340 Gs
234.0 mT
 4.94 kg / 10.89 pounds
4940.1 g / 48.5 N
 strong
3 mm 2092 Gs
209.2 mT
 3.95 kg / 8.70 pounds
3948.3 g / 38.7 N
 strong
5 mm 1611 Gs
161.1 mT
 2.34 kg / 5.17 pounds
2343.4 g / 23.0 N
 strong
10 mm 775 Gs
77.5 mT
 0.54 kg / 1.19 pounds
541.6 g / 5.3 N
 safe
15 mm 387 Gs
38.7 mT
 0.13 kg / 0.30 pounds
135.0 g / 1.3 N
 safe
20 mm 211 Gs
21.1 mT
 0.04 kg / 0.09 pounds
40.2 g / 0.4 N
 safe
30 mm 80 Gs
8.0 mT
 0.01 kg / 0.01 pounds
5.7 g / 0.1 N
 safe
50 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 safe
Grip strength drops drastically with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., contamination, paint, dust) significantly weakens the grip. Magnets operate strongest at the point of direct contact; distance kills the power. Analyze how flashily the load capacity fall, when the product does not adhere tightly to the steel surface. When designing the mounting, avoid unnecessary gaps.

Table 2: Shear force (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 pounds
1386.0 g / 13.6 N
1 mm Stal (~0.2) 1.19 kg / 2.63 pounds
1194.0 g / 11.7 N
2 mm Stal (~0.2) 0.99 kg / 2.18 pounds
988.0 g / 9.7 N
3 mm Stal (~0.2) 0.79 kg / 1.74 pounds
790.0 g / 7.7 N
5 mm Stal (~0.2) 0.47 kg / 1.03 pounds
468.0 g / 4.6 N
10 mm Stal (~0.2) 0.11 kg / 0.24 pounds
108.0 g / 1.1 N
15 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data shows the estimated weight limit necessary to initiate the slippage of the magnet vertically against a upright steel plate (assuming standard friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - 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 pounds
2079.0 g / 20.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.39 kg / 3.06 pounds
1386.0 g / 13.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.69 kg / 1.53 pounds
693.0 g / 6.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.47 kg / 7.64 pounds
3465.0 g / 34.0 N
When placing a element on a vertical wall (e.g., a fridge), it will only hold just about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient mean that holders slip easier than they pull off. Want to create a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter weight. Application of an anti-slip coating can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MW 20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.69 kg / 1.53 pounds
693.0 g / 6.8 N
1 mm
25%
 1.73 kg / 3.82 pounds
1732.5 g / 17.0 N
2 mm
50%
 3.47 kg / 7.64 pounds
3465.0 g / 34.0 N
3 mm
75%
 5.20 kg / 11.46 pounds
5197.5 g / 51.0 N
5 mm
100%
 6.93 kg / 15.28 pounds
6930.0 g / 68.0 N
10 mm
100%
 6.93 kg / 15.28 pounds
6930.0 g / 68.0 N
11 mm
100%
 6.93 kg / 15.28 pounds
6930.0 g / 68.0 N
12 mm
100%
 6.93 kg / 15.28 pounds
6930.0 g / 68.0 N
A thin sheet is not enough to focus the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet works worse. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - power drop
MW 20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.93 kg / 15.28 pounds
6930.0 g / 68.0 N
 OK
40 °C -2.2% 6.78 kg / 14.94 pounds
6777.5 g / 66.5 N
 OK
60 °C -4.4% 6.63 kg / 14.61 pounds
6625.1 g / 65.0 N
80 °C -6.6% 6.47 kg / 14.27 pounds
6472.6 g / 63.5 N
100 °C -28.8% 4.93 kg / 10.88 pounds
4934.2 g / 48.4 N
Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the magnet's capacity momentarily drops. Do not use this magnet near heat sources higher than its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 14.87 kg / 32.79 pounds
4 380 Gs
2.23 kg / 4.92 pounds
2231 g / 21.9 N
 N/A
1 mm 13.89 kg / 30.63 pounds
5 357 Gs
2.08 kg / 4.59 pounds
2084 g / 20.4 N
 12.50 kg / 27.57 pounds
~0 Gs
2 mm 12.82 kg / 28.27 pounds
5 146 Gs
1.92 kg / 4.24 pounds
1923 g / 18.9 N
 11.54 kg / 25.44 pounds
~0 Gs
3 mm 11.71 kg / 25.82 pounds
4 918 Gs
1.76 kg / 3.87 pounds
1757 g / 17.2 N
 10.54 kg / 23.24 pounds
~0 Gs
5 mm 9.51 kg / 20.97 pounds
4 433 Gs
1.43 kg / 3.15 pounds
1427 g / 14.0 N
 8.56 kg / 18.88 pounds
~0 Gs
10 mm 5.03 kg / 11.09 pounds
3 223 Gs
0.75 kg / 1.66 pounds
754 g / 7.4 N
 4.53 kg / 9.98 pounds
~0 Gs
20 mm 1.16 kg / 2.56 pounds
1 549 Gs
0.17 kg / 0.38 pounds
174 g / 1.7 N
 1.05 kg / 2.31 pounds
~0 Gs
50 mm 0.03 kg / 0.07 pounds
251 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
159 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
107 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
75 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a much further distance than a neodymium and metal combination. Such a system of two magnets generates a stronger field and a larger range of action. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Figures show friction force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 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
Powerful magnet radiation poses a large risk to electronics and medical implants. These neodymiums generate a flux that destroys function of digital equipment. Be aware: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
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
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 9 675 Mx 96.7 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers as well as sensors. Pc value defines 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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly weakens 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) = 0.35

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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%
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
Quick Unit Converter
Force (pull)
Magnetic Induction
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The offered product is an extremely powerful cylinder magnet, produced from modern NdFeB material, which, at dimensions of Ø20x5 mm, guarantees maximum efficiency. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 6.93 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 67.95 N with a weight of only 11.78 g, this rod 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 stability in industry, anaerobic resins 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 even stronger magnets in the same volume (Ø20x5), 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 20 mm and height 5 mm. The key parameter here is the holding force amounting to approximately 6.93 kg (force ~67.95 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. 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 neodymium magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • Magnets very well defend themselves against demagnetization caused by foreign field sources,
  • In other words, due to the metallic layer of silver, the element is aesthetically pleasing,
  • Magnetic induction on the top side of the magnet remains impressive,
  • 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 modularity in shaping and the ability to customize to complex applications,
  • Fundamental importance in modern industrial fields – they find application in data components, electric motors, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Limitations

Cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

The lifting capacity listed is a result of laboratory testing performed under the following configuration:
  • using a plate made of low-carbon steel, functioning as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, mainly (from most important):
  • Distance (between the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Adults only

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are very dangerous.

Pinching danger

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

Respect the power

Exercise caution. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can move away.

Compass and GPS

An intense magnetic field interferes with the operation of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Thermal limits

Watch the temperature. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Allergic reactions

Certain individuals suffer from a contact allergy to nickel, which is the standard coating for neodymium magnets. Prolonged contact may cause skin redness. We strongly advise use safety gloves.

Data carriers

Do not bring magnets close to a wallet, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Implant safety

Patients with a ICD must keep an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Beware of splinters

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?