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MW 18.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010036

GTIN/EAN: 5906301810353

5.00

Diameter Ø

18.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

21.04 g

Magnetization Direction

→ diametrical

Load capacity

11.68 kg / 114.54 N

Magnetic Induction

450.35 mT / 4503 Gs

Coating

[NiCuNi] Nickel

technical details »

11.07 ZŁ with VAT / pcs + price for transport

9.00 ZŁ net + 23% VAT / pcs

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Specifications and shape of a neodymium magnet can be analyzed with our modular calculator.

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Technical specification - MW 18.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 18.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010036
GTIN/EAN 5906301810353
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 18.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 21.04 g
Magnetization Direction → diametrical
Load capacity ~ ? 11.68 kg / 114.54 N
Magnetic Induction ~ ? 450.35 mT / 4503 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 18.9x10 / 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 modeling of the magnet - report

Presented information constitute the direct effect of a mathematical simulation. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly differ. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - power drop
MW 18.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4502 Gs
450.2 mT
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
 crushing
1 mm 4050 Gs
405.0 mT
 9.46 kg / 20.85 pounds
9455.2 g / 92.8 N
 warning
2 mm 3587 Gs
358.7 mT
 7.42 kg / 16.35 pounds
7416.3 g / 72.8 N
 warning
3 mm 3139 Gs
313.9 mT
 5.68 kg / 12.52 pounds
5678.8 g / 55.7 N
 warning
5 mm 2346 Gs
234.6 mT
 3.17 kg / 6.99 pounds
3172.5 g / 31.1 N
 warning
10 mm 1100 Gs
110.0 mT
 0.70 kg / 1.54 pounds
696.7 g / 6.8 N
 weak grip
15 mm 554 Gs
55.4 mT
 0.18 kg / 0.39 pounds
176.7 g / 1.7 N
 weak grip
20 mm 308 Gs
30.8 mT
 0.05 kg / 0.12 pounds
54.6 g / 0.5 N
 weak grip
30 mm 120 Gs
12.0 mT
 0.01 kg / 0.02 pounds
8.3 g / 0.1 N
 weak grip
50 mm 32 Gs
3.2 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 weak grip
Grip strength weakens significantly with every mm of gap. Remember that even the smallest gap (e.g., contamination, varnish, veneer) significantly reduces the pull force. Magnetic products operate most effectively at the point of direct contact; distance weakens the power. Notice how rapidly the load capacity plummet, when the product does not adhere directly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Slippage load (wall)
MW 18.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.34 kg / 5.15 pounds
2336.0 g / 22.9 N
1 mm Stal (~0.2) 1.89 kg / 4.17 pounds
1892.0 g / 18.6 N
2 mm Stal (~0.2) 1.48 kg / 3.27 pounds
1484.0 g / 14.6 N
3 mm Stal (~0.2) 1.14 kg / 2.50 pounds
1136.0 g / 11.1 N
5 mm Stal (~0.2) 0.63 kg / 1.40 pounds
634.0 g / 6.2 N
10 mm Stal (~0.2) 0.14 kg / 0.31 pounds
140.0 g / 1.4 N
15 mm Stal (~0.2) 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 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 table below shows the estimated force necessary to cause the downward movement of the magnet downwards against a upright steel wall (considering typical friction). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 18.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.50 kg / 7.72 pounds
3504.0 g / 34.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.34 kg / 5.15 pounds
2336.0 g / 22.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.17 kg / 2.57 pounds
1168.0 g / 11.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.84 kg / 12.87 pounds
5840.0 g / 57.3 N
When hanging a holder on a vertical plane (e.g., a board), it you can count on barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that products move down faster than they pop off the substrate. Planning a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the element will slip down under a significantly smaller cargo. Application of an anti-slip layer can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 18.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.58 kg / 1.29 pounds
584.0 g / 5.7 N
1 mm
13%
 1.46 kg / 3.22 pounds
1460.0 g / 14.3 N
2 mm
25%
 2.92 kg / 6.44 pounds
2920.0 g / 28.6 N
3 mm
38%
 4.38 kg / 9.66 pounds
4380.0 g / 43.0 N
5 mm
63%
 7.30 kg / 16.09 pounds
7300.0 g / 71.6 N
10 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
11 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
12 mm
100%
 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
A thin metal plate cannot focus the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MW 18.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.68 kg / 25.75 pounds
11680.0 g / 114.6 N
 OK
40 °C -2.2% 11.42 kg / 25.18 pounds
11423.0 g / 112.1 N
 OK
60 °C -4.4% 11.17 kg / 24.62 pounds
11166.1 g / 109.5 N
 OK
80 °C -6.6% 10.91 kg / 24.05 pounds
10909.1 g / 107.0 N
100 °C -28.8% 8.32 kg / 18.33 pounds
8316.2 g / 81.6 N
Classic neodymiums lose strength past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. As the temperature rises, the magnet's power briefly decreases. Avoid using this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 18.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 35.05 kg / 77.28 pounds
5 600 Gs
5.26 kg / 11.59 pounds
5258 g / 51.6 N
 N/A
1 mm 31.70 kg / 69.88 pounds
8 562 Gs
4.75 kg / 10.48 pounds
4754 g / 46.6 N
 28.53 kg / 62.89 pounds
~0 Gs
2 mm 28.38 kg / 62.56 pounds
8 101 Gs
4.26 kg / 9.38 pounds
4256 g / 41.8 N
 25.54 kg / 56.30 pounds
~0 Gs
3 mm 25.22 kg / 55.59 pounds
7 636 Gs
3.78 kg / 8.34 pounds
3782 g / 37.1 N
 22.69 kg / 50.03 pounds
~0 Gs
5 mm 19.53 kg / 43.05 pounds
6 720 Gs
2.93 kg / 6.46 pounds
2929 g / 28.7 N
 17.57 kg / 38.75 pounds
~0 Gs
10 mm 9.52 kg / 20.99 pounds
4 692 Gs
1.43 kg / 3.15 pounds
1428 g / 14.0 N
 8.57 kg / 18.89 pounds
~0 Gs
20 mm 2.09 kg / 4.61 pounds
2 199 Gs
0.31 kg / 0.69 pounds
314 g / 3.1 N
 1.88 kg / 4.15 pounds
~0 Gs
50 mm 0.06 kg / 0.13 pounds
372 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.12 pounds
~0 Gs
60 mm 0.03 kg / 0.06 pounds
241 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
70 mm 0.01 kg / 0.03 pounds
164 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
80 mm 0.01 kg / 0.01 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
86 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
65 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and steel setup. The setup of two magnets creates a more powerful interaction and a larger range of performance. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the impact force is massive. The repulsion force is slightly lower than the connection force, but still large.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
* Figures apply to shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 18.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a serious hazard to electronics as well as medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 18.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.63 km/h
(6.84 m/s)
 0.49 J
30 mm 41.18 km/h
(11.44 m/s)
 1.38 J
50 mm 53.13 km/h
(14.76 m/s)
 2.29 J
100 mm 75.14 km/h
(20.87 m/s)
 4.58 J
Neodymium magnets are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or injury to skin. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MW 18.9x10 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MW 18.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.7 µWb
Pc Coefficient 0.61 High (Stable)
Total magnetic flux emitted by the pole surface. Key data when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 18.9x10 / N38

Environment Effective steel pull Effect
Air (land) 11.68 kg Standard
Water (riverbed) 13.37 kg
(+1.69 kg buoyancy gain)
+14.5%
Rust risk: 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. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61

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%
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: 010036-2026
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This product is a very strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø18.9x10 mm, guarantees maximum efficiency. The MW 18.9x10 / N38 component boasts high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 11.68 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 114.54 N with a weight of only 21.04 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø18.9x10), 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 18.9 mm and height 10 mm. The value of 114.54 N means that the magnet is capable of holding a weight many times exceeding its own mass of 21.04 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 10 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 through the diameter if your project requires it.

Pros and cons of rare earth magnets.

Advantages

Apart from their consistent power, neodymium magnets have these key benefits:
  • They do not lose strength, even after approximately 10 years – the reduction in power is only ~1% (according to tests),
  • Neodymium magnets are distinguished by remarkably resistant to demagnetization caused by magnetic disturbances,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the surface of the magnet is maximum,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of detailed modeling as well as adapting to defined applications,
  • Significant place in innovative solutions – they serve a role in HDD drives, drive modules, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Cons

What to avoid - cons of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complex forms - preferred is a housing - mounting mechanism.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products can disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

The load parameter shown represents the limit force, obtained under ideal test conditions, meaning:
  • with the use of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with an ground touching surface
  • without the slightest insulating layer between the magnet and steel
  • under axial force direction (90-degree angle)
  • in temp. approx. 20°C

What influences lifting capacity in practice

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Electronic devices

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

Immense force

Handle magnets with awareness. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Operating temperature

Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Protective goggles

Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.

GPS Danger

Note: rare earth magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and choose versions in plastic housing.

Combustion hazard

Machining of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Health Danger

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Pinching danger

Big blocks can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

This is not a toy

Neodymium magnets are not intended for children. Eating a few magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.

Danger! Learn more about hazards in the article: Magnet Safety Guide.