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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 specifications »

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Technical - 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 analysis of the magnet - technical parameters

These values constitute the outcome of a physical simulation. Results are based on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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
 dangerous!
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
Pulling power drops drastically with every mm of gap. Note that even the smallest gap (e.g., contamination, paint, dust) significantly reduces the pull force. Neodymiums work most effectively in perfect adhesion; distance weakens the force. Observe how rapidly the pull force drop, when the magnet does not adhere directly to the steel surface. When planning the assembly, eliminate 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 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 following data indicates the approximate holding capacity required to cause the slippage of the magnet down along a vertical steel plate (assuming typical friction coefficient). This parameter varies with the separation distance between the magnet and the metal.

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
When hanging a holder on a vertical surface (e.g., a board), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that products slip easier than they detach. Planning a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter cargo. Using a rubber pad can effectively raise the stability.

Table 4: Steel thickness (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 cannot take in the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's power, you require a sufficiently solid element of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the holder works worse. We suggest choosing the steel thickness 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
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Protect against heat – heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's power temporarily lowers. Do not use this product near heat sources higher than its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
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
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a further horizon of operation. Want to build 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 extreme. The levitation is marginally weaker than the connection force, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Figures apply to friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

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
Timepiece 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Remote 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 is a large risk to electronic devices and medical implants. These magnets produce a flux that destroys function of digital equipment. Notice: the unseen radiation acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - 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
NdFeB products are very brittle – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction 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)
Flux value emitted by the pole surface. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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. Wall mount (shear)

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

2. Steel saturation

*Thin metal sheet (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.

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: 010036-2026
Quick Unit Converter
Force (pull)
Field Strength
Input a value in any box, to see the rest will recalculate on the fly.

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This product is a very strong cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø18.9x10 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 11.68 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction 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 chipping the coating of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. 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 lifting capacity amounting to approximately 11.68 kg (force ~114.54 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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. 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.

Pros and cons of neodymium magnets.

Advantages

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even during nearly ten years – the reduction in strength is only ~1% (based on measurements),
  • Neodymium magnets remain exceptionally resistant to demagnetization caused by external interference,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Magnets have excellent magnetic induction on the working surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Due to the ability of accurate molding and adaptation to unique solutions, neodymium magnets can be produced in a broad palette of geometric configurations, which amplifies use scope,
  • Wide application in high-tech industry – they are utilized in hard drives, drive modules, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what it depends on?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • with a thickness minimum 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Please note that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Do not overheat magnets

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Phone sensors

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Keep a separation from your phone, tablet, and GPS.

Bone fractures

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Do not drill into magnets

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

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Medical interference

For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Data carriers

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Magnet fragility

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Handling guide

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

Swallowing risk

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from children and animals.

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