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MW 10x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010007

GTIN/EAN: 5906301810063

5.00

Diameter Ø

10 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

2.23 kg / 21.88 N

Magnetic Induction

600.73 mT / 6007 Gs

Coating

[NiCuNi] Nickel

technical details »

4.92 ZŁ with VAT / pcs + price for transport

4.00 ZŁ net + 23% VAT / pcs

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Product card - MW 10x20 / N38 - cylindrical magnet

Specification / characteristics - MW 10x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010007
GTIN/EAN 5906301810063
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 10 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 11.78 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.23 kg / 21.88 N
Magnetic Induction ~ ? 600.73 mT / 6007 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 10x20 / 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 analysis of the assembly - report

The following values constitute the direct effect of a physical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MW 10x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6003 Gs
600.3 mT
 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
 warning
1 mm 4815 Gs
481.5 mT
 1.44 kg / 3.16 LBS
1435.1 g / 14.1 N
 weak grip
2 mm 3743 Gs
374.3 mT
 0.87 kg / 1.91 LBS
867.2 g / 8.5 N
 weak grip
3 mm 2869 Gs
286.9 mT
 0.51 kg / 1.12 LBS
509.3 g / 5.0 N
 weak grip
5 mm 1696 Gs
169.6 mT
 0.18 kg / 0.39 LBS
177.9 g / 1.7 N
 weak grip
10 mm 570 Gs
57.0 mT
 0.02 kg / 0.04 LBS
20.1 g / 0.2 N
 weak grip
15 mm 256 Gs
25.6 mT
 0.00 kg / 0.01 LBS
4.1 g / 0.0 N
 weak grip
20 mm 137 Gs
13.7 mT
 0.00 kg / 0.00 LBS
1.2 g / 0.0 N
 weak grip
30 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 weak grip
50 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Magnetic force drops drastically per each millimeter of spacing. Keep in mind that even a very thin break (e.g., dirt, paint, rust) significantly diminishes the holding power. Neodymiums work most effectively at the point of direct contact; air break weakens the force. Analyze how rapidly the pull force fall, when the product does not adhere directly to the steel surface. When designing the mounting, discard redundant distances.

Table 2: Vertical capacity (vertical surface)
MW 10x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.45 kg / 0.98 LBS
446.0 g / 4.4 N
1 mm Stal (~0.2) 0.29 kg / 0.63 LBS
288.0 g / 2.8 N
2 mm Stal (~0.2) 0.17 kg / 0.38 LBS
174.0 g / 1.7 N
3 mm Stal (~0.2) 0.10 kg / 0.22 LBS
102.0 g / 1.0 N
5 mm Stal (~0.2) 0.04 kg / 0.08 LBS
36.0 g / 0.4 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below presents the theoretical shear load needed to start the downward movement of the magnet vertically against a vertical steel plate (assuming standard friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 10x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.67 kg / 1.47 LBS
669.0 g / 6.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.45 kg / 0.98 LBS
446.0 g / 4.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.49 LBS
223.0 g / 2.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.12 kg / 2.46 LBS
1115.0 g / 10.9 N
When mounting a magnet on a vertical wall (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that magnets slide down faster than they pop off the substrate. Designing a wall mount? Note that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will slide down under a significantly smaller weight. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 10x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.22 kg / 0.49 LBS
223.0 g / 2.2 N
1 mm
25%
 0.56 kg / 1.23 LBS
557.5 g / 5.5 N
2 mm
50%
 1.12 kg / 2.46 LBS
1115.0 g / 10.9 N
3 mm
75%
 1.67 kg / 3.69 LBS
1672.5 g / 16.4 N
5 mm
100%
 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
10 mm
100%
 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
11 mm
100%
 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
12 mm
100%
 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
A too thin steel cannot absorb the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel dimension based on the following data.

Table 5: Working in heat (stability) - thermal limit
MW 10x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.23 kg / 4.92 LBS
2230.0 g / 21.9 N
 OK
40 °C -2.2% 2.18 kg / 4.81 LBS
2180.9 g / 21.4 N
 OK
60 °C -4.4% 2.13 kg / 4.70 LBS
2131.9 g / 20.9 N
 OK
80 °C -6.6% 2.08 kg / 4.59 LBS
2082.8 g / 20.4 N
100 °C -28.8% 1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
Standard neodymium magnets change their properties power past the thermal threshold. Watch out for overheating – excessive heat can permanently demagnetize this product. With every degree above norm, the neodymium's capacity momentarily decreases. Do not use this product near heat sources higher than its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties sooner than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MW 10x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.45 kg / 38.46 LBS
6 140 Gs
2.62 kg / 5.77 LBS
2617 g / 25.7 N
 N/A
1 mm 14.15 kg / 31.20 LBS
10 813 Gs
2.12 kg / 4.68 LBS
2123 g / 20.8 N
 12.74 kg / 28.08 LBS
~0 Gs
2 mm 11.23 kg / 24.75 LBS
9 631 Gs
1.68 kg / 3.71 LBS
1684 g / 16.5 N
 10.11 kg / 22.28 LBS
~0 Gs
3 mm 8.78 kg / 19.35 LBS
8 515 Gs
1.32 kg / 2.90 LBS
1316 g / 12.9 N
 7.90 kg / 17.41 LBS
~0 Gs
5 mm 5.21 kg / 11.48 LBS
6 559 Gs
0.78 kg / 1.72 LBS
781 g / 7.7 N
 4.69 kg / 10.33 LBS
~0 Gs
10 mm 1.39 kg / 3.07 LBS
3 391 Gs
0.21 kg / 0.46 LBS
209 g / 2.0 N
 1.25 kg / 2.76 LBS
~0 Gs
20 mm 0.16 kg / 0.35 LBS
1 140 Gs
0.02 kg / 0.05 LBS
24 g / 0.2 N
 0.14 kg / 0.31 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
165 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
107 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
74 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
53 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
39 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
30 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets generates a stronger field and a larger range of operation. Designing a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is huge. The levitation is marginally weaker than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
* Results show shear force of a pair of same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - warnings
MW 10x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a large risk to IT equipment as well as medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MW 10x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 13.95 km/h
(3.88 m/s)
 0.09 J
30 mm 24.03 km/h
(6.68 m/s)
 0.26 J
50 mm 31.03 km/h
(8.62 m/s)
 0.44 J
100 mm 43.88 km/h
(12.19 m/s)
 0.88 J
Magnetic elements are very brittle – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 10x20 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 10x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 223 Mx 52.2 µWb
Pc Coefficient 1.21 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 10x20 / N38

Environment Effective steel pull Effect
Air (land) 2.23 kg Standard
Water (riverbed) 2.55 kg
(+0.32 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!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Plate thickness effect

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

3. Thermal stability

*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) = 1.21

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
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%
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: 010007-2026
Measurement Calculator
Pulling force
Field Strength
Simply fill in a single box, and the converter compute the rest automatically.

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It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 21.88 N with a weight of only 11.78 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 10.1 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 high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø10x20), 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 10 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 2.23 kg (force ~21.88 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 20 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • In other words, due to the smooth surface of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of accurate forming as well as modifying to precise needs,
  • Key role in future technologies – they find application in hard drives, electric drive systems, advanced medical instruments, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • NdFeB magnets lose force 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices 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 increases costs of application in large quantities

Lifting parameters

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

Magnet power is the result of a measurement for the most favorable conditions, including:
  • using a base made of high-permeability steel, functioning as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

What influences lifting capacity in practice

Real force impacted by specific conditions, mainly (from most important):
  • Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Phone sensors

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a device to prevent breaking the sensors.

Warning for heart patients

People with a heart stimulator have to keep an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Allergic reactions

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands or opt for encased magnets.

Handling rules

Use magnets consciously. Their immense force can surprise even experienced users. Be vigilant and respect their force.

Crushing force

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Permanent damage

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Swallowing risk

Absolutely keep magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.

Flammability

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Electronic hazard

Avoid bringing magnets near a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

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