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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 details »

5.56 ZŁ with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

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Parameters as well as structure of a neodymium magnet can be analyzed with our modular 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

Physical simulation of the magnet - data

Presented values represent the result of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force 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 lbs
6930.0 g / 68.0 N
 strong
1 mm 2573 Gs
257.3 mT
 5.97 kg / 13.17 lbs
5975.0 g / 58.6 N
 strong
2 mm 2340 Gs
234.0 mT
 4.94 kg / 10.89 lbs
4940.1 g / 48.5 N
 strong
3 mm 2092 Gs
209.2 mT
 3.95 kg / 8.70 lbs
3948.3 g / 38.7 N
 strong
5 mm 1611 Gs
161.1 mT
 2.34 kg / 5.17 lbs
2343.4 g / 23.0 N
 strong
10 mm 775 Gs
77.5 mT
 0.54 kg / 1.19 lbs
541.6 g / 5.3 N
 low risk
15 mm 387 Gs
38.7 mT
 0.13 kg / 0.30 lbs
135.0 g / 1.3 N
 low risk
20 mm 211 Gs
21.1 mT
 0.04 kg / 0.09 lbs
40.2 g / 0.4 N
 low risk
30 mm 80 Gs
8.0 mT
 0.01 kg / 0.01 lbs
5.7 g / 0.1 N
 low risk
50 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 low risk
Magnetic force decreases drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) noticeably reduces the pull force. Neodymiums work optimally at the point of direct contact; air break kills the force. See how rapidly the parameters fall, when the product does not adhere tightly to the steel surface. When calculating the mounting, eliminate redundant distances.

Table 2: Slippage force (wall)
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 table below calculates the theoretical force necessary to start the downward movement of the magnet vertically along a upright steel plate (assuming standard friction). The holding force varies with the gap size between the magnet and the surface.

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 mounting a element on a upright wall (e.g., a fridge), it you can count on barely approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets move down easier than they detach. Want to create a hanger? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a much lighter load. Using a rubber layer can drastically increase the grip.

Table 4: Material efficiency (saturation) - 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 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 too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a weak sheet, the field will pass right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (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 irreversibly lose power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's capacity temporarily lowers. Avoid using this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 magnetic products 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 strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The levitation is slightly lower than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Estimates refer to shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 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 electronics and pacemakers. These NdFeB products generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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 delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can cause material chips or painful pinches to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses 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)
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 (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 magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Plate thickness effect

*Thin steel (e.g. computer case) severely reduces 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

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
Chemical composition
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 extremely powerful cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø20x5 mm, guarantees maximum efficiency. 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 impressive 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 typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. 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.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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 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 impressive magnetic energy density. 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 protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet 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 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.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • In other words, due to the aesthetic layer of silver, the element gains visual value,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Considering the option of free shaping and adaptation to custom solutions, NdFeB magnets can be produced in a broad palette of forms and dimensions, which makes them more universal,
  • Huge importance in advanced technology sectors – they are used in hard drives, electric motors, diagnostic systems, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what affects it?

Breakaway force was determined for optimal configuration, taking into account:
  • using a sheet made of mild steel, serving as a circuit closing element
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a plane free of scratches
  • with total lack of distance (without paint)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Real force is affected by working environment parameters, mainly (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, 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 attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a polished 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 slight gap between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with NdFeB magnets
Warning for heart patients

People with a ICD must keep an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

Physical harm

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

Immense force

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, cease handling magnets and wear gloves.

Maximum temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Precision electronics

A strong magnetic field disrupts the operation of magnetometers in phones and navigation systems. Keep magnets near a device to avoid damaging the sensors.

Cards and drives

Avoid bringing magnets near a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Do not drill into magnets

Powder generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Material brittleness

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them shattering into shards.

This is not a toy

Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?