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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

11.07 with VAT / pcs + price for transport

9.00 ZŁ net + 23% VAT / pcs

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Force as well as shape of a neodymium magnet can be analyzed with our our magnetic calculator.

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Detailed 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

Engineering modeling of the product - data

The following data are the result of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force 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
safe
15 mm 554 Gs
55.4 mT
0.18 kg / 0.39 lbs
176.7 g / 1.7 N
safe
20 mm 308 Gs
30.8 mT
0.05 kg / 0.12 lbs
54.6 g / 0.5 N
safe
30 mm 120 Gs
12.0 mT
0.01 kg / 0.02 lbs
8.3 g / 0.1 N
safe
50 mm 32 Gs
3.2 mT
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
safe

Table 2: Shear capacity (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

Table 3: Wall mounting (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

Table 4: Steel thickness (substrate influence) - 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 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

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 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

Table 6: Magnet-Magnet interaction (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 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

Table 7: Protective zones (implants) - 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

Table 8: Collisions (cracking risk) - warning
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

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)

Table 10: Construction 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)

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically limits 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) = 0.61

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
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%
Environmental data
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
Magnet Unit Converter
Magnet pull force

Magnetic Field

Other proposals

The presented product is an incredibly powerful cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø18.9x10 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 11.68 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 114.54 N with a weight of only 21.04 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, 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 the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest 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.
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 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 protects the surface against oxidation, 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. 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 as well as disadvantages of rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By using a shiny coating of nickel, the element has an proper look,
  • Magnets have huge magnetic induction on the outer layer,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • In view of the ability of flexible forming and customization to custom needs, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which makes them more universal,
  • Versatile presence in future technologies – they are used in magnetic memories, motor assemblies, diagnostic systems, and multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Lifting parameters

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 11.68 kg is a result of laboratory testing conducted under the following configuration:
  • with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • with zero gap (no coatings)
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of lifting force in real conditions

In practice, the real power results from several key aspects, presented from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Dust explosion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Data carriers

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Danger to the youngest

NdFeB magnets are not suitable for play. Swallowing several magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Warning for heart patients

For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Safe operation

Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can move away.

Precision electronics

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Eye protection

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets will cause them breaking into small pieces.

Serious injuries

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.

Danger! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98