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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

product specifications »

5.56 ZŁ with VAT / pcs + price for transport

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Technical of the product - 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 magnet - technical parameters

The following data represent the outcome of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
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
 warning
1 mm 2573 Gs
257.3 mT
 5.97 kg / 13.17 pounds
5975.0 g / 58.6 N
 warning
2 mm 2340 Gs
234.0 mT
 4.94 kg / 10.89 pounds
4940.1 g / 48.5 N
 warning
3 mm 2092 Gs
209.2 mT
 3.95 kg / 8.70 pounds
3948.3 g / 38.7 N
 warning
5 mm 1611 Gs
161.1 mT
 2.34 kg / 5.17 pounds
2343.4 g / 23.0 N
 warning
10 mm 775 Gs
77.5 mT
 0.54 kg / 1.19 pounds
541.6 g / 5.3 N
 weak grip
15 mm 387 Gs
38.7 mT
 0.13 kg / 0.30 pounds
135.0 g / 1.3 N
 weak grip
20 mm 211 Gs
21.1 mT
 0.04 kg / 0.09 pounds
40.2 g / 0.4 N
 weak grip
30 mm 80 Gs
8.0 mT
 0.01 kg / 0.01 pounds
5.7 g / 0.1 N
 weak grip
50 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 weak grip
Grip strength weakens drastically per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, rust) significantly weakens the grip. Magnets work strongest in perfect adhesion; gap kills the force. Analyze how flashily the parameters fall, when the magnet does not adhere tightly to the steel surface. When designing the arrangement, discard redundant distances.

Table 2: Vertical hold (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 presents the estimated shear load needed to cause the sliding of the magnet down against a upright steel plate (considering typical friction). This value is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 mounting a element on a vertical plane (e.g., a fridge), it will only hold barely about 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that magnets slide down easier than they detach. Want to create a hanger? Note that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slide down under a noticeably lighter weight. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - 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 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 metal plate is unable to conduct the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To achieve the maximum of this neodymium's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - 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 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
Classic neodymiums irreversibly lose strength above the temperature limit. Avoid high temperatures – high temperature can irreversibly damage this magnet. With every degree above norm, the neodymium's capacity briefly lowers. Refrain from using this magnet near heat sources higher than its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 magnetic products interact from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the impact force is massive. The repulsion force is a bit weaker than the connection force, but still significant.
*Field value between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
* Estimates demonstrate shear force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Extremely neodym field is a real danger to electronic devices and pacemakers. These NdFeB products generate a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (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
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or injury to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when working with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. 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 passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient determines the working geometry.

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Note: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Thermal stability

*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.

Engineering data and GPSR
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%
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
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The offered product is an extremely powerful cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø20x5 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 6.93 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. 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 every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough 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 (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
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 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 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.

Pros and cons of rare earth magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
  • They possess excellent resistance to magnetic field loss due to external fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the ability to adapt to complex applications,
  • Significant place in modern industrial fields – they are commonly used in hard drives, brushless drives, medical devices, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these products can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 6.93 kg is a result of laboratory testing conducted under the following configuration:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • with direct contact (without paint)
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

Bear in mind that the working load may be lower depending on the following factors, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
No play value

Product intended for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Bone fractures

Danger of trauma: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Magnet fragility

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Medical implants

People with a pacemaker should maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Keep away from computers

Device Safety: Strong magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Precision electronics

A strong magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Demagnetization risk

Do not overheat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Dust explosion hazard

Dust produced during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Warning for allergy sufferers

Medical facts indicate that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose versions in plastic housing.

Immense force

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

Caution! More info about risks in the article: Magnet Safety Guide.