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MW 18.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010036

GTIN/EAN: 5906301810353

5.00
Load capacity 11.68 kg / 114.54 N Magnetic Induction 450.35 mT / 4503 Gs
Diameter Ø
18.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
21.04 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel
technical parameters »

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Parameters as well as shape of a neodymium magnet can be tested with our modular calculator.

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Product card - 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

Engineering analysis of the assembly - data

Presented values are the result of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
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 LBS
11680.0 g / 114.6 N
 critical level
1 mm 4050 Gs
405.0 mT
 9.46 kg / 20.85 LBS
9455.2 g / 92.8 N
 strong
2 mm 3587 Gs
358.7 mT
 7.42 kg / 16.35 LBS
7416.3 g / 72.8 N
 strong
3 mm 3139 Gs
313.9 mT
 5.68 kg / 12.52 LBS
5678.8 g / 55.7 N
 strong
5 mm 2346 Gs
234.6 mT
 3.17 kg / 6.99 LBS
3172.5 g / 31.1 N
 strong
10 mm 1100 Gs
110.0 mT
 0.70 kg / 1.54 LBS
696.7 g / 6.8 N
 weak grip
15 mm 554 Gs
55.4 mT
 0.18 kg / 0.39 LBS
176.7 g / 1.7 N
 weak grip
20 mm 308 Gs
30.8 mT
 0.05 kg / 0.12 LBS
54.6 g / 0.5 N
 weak grip
30 mm 120 Gs
12.0 mT
 0.01 kg / 0.02 LBS
8.3 g / 0.1 N
 weak grip
50 mm 32 Gs
3.2 mT
 0.00 kg / 0.00 LBS
0.6 g / 0.0 N
 weak grip
Grip strength drops drastically per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) strongly weakens the grip. Neodymiums hold strongest in perfect adhesion; distance drastically cuts the force. Notice how flashily the load capacity drop, when the product does not adhere directly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Shear hold (vertical surface)
MW 18.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.34 kg / 5.15 LBS
2336.0 g / 22.9 N
1 mm Stal (~0.2) 1.89 kg / 4.17 LBS
1892.0 g / 18.6 N
2 mm Stal (~0.2) 1.48 kg / 3.27 LBS
1484.0 g / 14.6 N
3 mm Stal (~0.2) 1.14 kg / 2.50 LBS
1136.0 g / 11.1 N
5 mm Stal (~0.2) 0.63 kg / 1.40 LBS
634.0 g / 6.2 N
10 mm Stal (~0.2) 0.14 kg / 0.31 LBS
140.0 g / 1.4 N
15 mm Stal (~0.2) 0.04 kg / 0.08 LBS
36.0 g / 0.4 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 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 approximate force required to initiate the slippage of the magnet vertically on a upright steel wall (assuming typical friction coefficient). This value depends on the gap size between the magnet and the metal.

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 LBS
3504.0 g / 34.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.34 kg / 5.15 LBS
2336.0 g / 22.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.17 kg / 2.57 LBS
1168.0 g / 11.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.84 kg / 12.87 LBS
5840.0 g / 57.3 N
When placing a element on a vertical surface (e.g., a fridge), it will maintain only about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that products slide down easier than they pull off. Designing a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized pad can effectively improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 18.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.58 kg / 1.29 LBS
584.0 g / 5.7 N
1 mm
13%
 1.46 kg / 3.22 LBS
1460.0 g / 14.3 N
2 mm
25%
 2.92 kg / 6.44 LBS
2920.0 g / 28.6 N
3 mm
38%
 4.38 kg / 9.66 LBS
4380.0 g / 43.0 N
5 mm
63%
 7.30 kg / 16.09 LBS
7300.0 g / 71.6 N
10 mm
100%
 11.68 kg / 25.75 LBS
11680.0 g / 114.6 N
11 mm
100%
 11.68 kg / 25.75 LBS
11680.0 g / 114.6 N
12 mm
100%
 11.68 kg / 25.75 LBS
11680.0 g / 114.6 N
A thin sheet is incapable of take in the full magnetic flux, which squanders power of the holder. Should you attach a powerful product to a weak sheet, the flux will pass right through and the attraction force will be weaker. To utilize 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
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 LBS
11680.0 g / 114.6 N
 OK
40 °C -2.2% 11.42 kg / 25.18 LBS
11423.0 g / 112.1 N
 OK
60 °C -4.4% 11.17 kg / 24.62 LBS
11166.1 g / 109.5 N
 OK
80 °C -6.6% 10.91 kg / 24.05 LBS
10909.1 g / 107.0 N
100 °C -28.8% 8.32 kg / 18.33 LBS
8316.2 g / 81.6 N
Classic neodymiums change their properties strength above the temperature limit. Watch out for overheating – excessive heat can irreversibly damage this product. With every degree above norm, the neodymium's power briefly decreases. Refrain from using this magnet close to ovens higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 35.05 kg / 77.28 LBS
5 600 Gs
5.26 kg / 11.59 LBS
5258 g / 51.6 N
 N/A
1 mm 31.70 kg / 69.88 LBS
8 562 Gs
4.75 kg / 10.48 LBS
4754 g / 46.6 N
 28.53 kg / 62.89 LBS
~0 Gs
2 mm 28.38 kg / 62.56 LBS
8 101 Gs
4.26 kg / 9.38 LBS
4256 g / 41.8 N
 25.54 kg / 56.30 LBS
~0 Gs
3 mm 25.22 kg / 55.59 LBS
7 636 Gs
3.78 kg / 8.34 LBS
3782 g / 37.1 N
 22.69 kg / 50.03 LBS
~0 Gs
5 mm 19.53 kg / 43.05 LBS
6 720 Gs
2.93 kg / 6.46 LBS
2929 g / 28.7 N
 17.57 kg / 38.75 LBS
~0 Gs
10 mm 9.52 kg / 20.99 LBS
4 692 Gs
1.43 kg / 3.15 LBS
1428 g / 14.0 N
 8.57 kg / 18.89 LBS
~0 Gs
20 mm 2.09 kg / 4.61 LBS
2 199 Gs
0.31 kg / 0.69 LBS
314 g / 3.1 N
 1.88 kg / 4.15 LBS
~0 Gs
50 mm 0.06 kg / 0.13 LBS
372 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.05 kg / 0.12 LBS
~0 Gs
60 mm 0.03 kg / 0.06 LBS
241 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
70 mm 0.01 kg / 0.03 LBS
164 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
80 mm 0.01 kg / 0.01 LBS
116 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
86 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
65 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets attract each other from a wider radius than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is massive. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Estimates show shear force of dual same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
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
Powerful magnet radiation poses a large risk to IT equipment as well as medical implants. These neodymiums generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.61 km/h
(6.28 m/s)
 0.41 J
30 mm 23.29 km/h
(6.47 m/s)
 0.44 J
50 mm 23.31 km/h
(6.47 m/s)
 0.44 J
100 mm 23.31 km/h
(6.48 m/s)
 0.44 J
NdFeB products are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
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 passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: 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. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, the critical limit 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.

Technical specification and ecology

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 an incredibly powerful cylindrical magnet, manufactured from durable NdFeB material, which, with dimensions of Ø18.9x10 mm, guarantees maximum efficiency. The MW 18.9x10 / N38 model features an accuracy of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 11.68 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical 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 fastening or actuating element. 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, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority 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 in continuous sale in our store.
This model is characterized by dimensions Ø18.9x10 mm, which, at a weight of 21.04 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 11.68 kg (force ~114.54 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, 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 18.9 mm. 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 diametrically if your project requires it.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose power, even over approximately ten years – the drop in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are distinguished by extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a metallic nickel surface looks better,
  • Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate forming and adapting to complex needs,
  • Fundamental importance in future technologies – they are commonly used in computer drives, electric drive systems, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures 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 drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • When exposed to humidity, magnets usually rust. For applications 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 producing threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Breakaway force was determined for the most favorable conditions, assuming:
  • using a base made of low-carbon steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Holding efficiency is influenced by specific conditions, including (from priority):
  • Gap (between the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the power to be lost into the air.
  • Plate material – mild steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Handling guide

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

Swallowing risk

Only for adults. Small elements pose a choking risk, leading to severe trauma. Keep away from children and animals.

Finger safety

Risk of injury: The attraction force is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Operating temperature

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

Medical interference

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Allergic reactions

Studies show that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, refrain from touching magnets with bare hands and select coated magnets.

Safe distance

Data protection: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Flammability

Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Protective goggles

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Threat to navigation

Note: neodymium magnets generate a field that disrupts precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

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