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MW 21.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010045

GTIN/EAN: 5906301810445

Diameter Ø

21.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

28.25 g

Magnetization Direction

→ diametrical

Load capacity

14.65 kg / 143.71 N

Magnetic Induction

417.89 mT / 4179 Gs

Coating

[NiCuNi] Nickel

technical parameters »

15.50 ZŁ with VAT / pcs + price for transport

12.60 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 21.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 21.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010045
GTIN/EAN 5906301810445
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 21.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 28.25 g
Magnetization Direction → diametrical
Load capacity ~ ? 14.65 kg / 143.71 N
Magnetic Induction ~ ? 417.89 mT / 4179 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 21.9x10 / 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 assembly - data

The following data constitute the outcome of a physical analysis. Values rely on models for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MW 21.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4178 Gs
417.8 mT
 14.65 kg / 32.30 LBS
14650.0 g / 143.7 N
 dangerous!
1 mm 3830 Gs
383.0 mT
 12.31 kg / 27.15 LBS
12314.7 g / 120.8 N
 dangerous!
2 mm 3466 Gs
346.6 mT
 10.08 kg / 22.23 LBS
10083.5 g / 98.9 N
 dangerous!
3 mm 3104 Gs
310.4 mT
 8.09 kg / 17.83 LBS
8086.3 g / 79.3 N
 strong
5 mm 2432 Gs
243.2 mT
 4.97 kg / 10.95 LBS
4966.5 g / 48.7 N
 strong
10 mm 1257 Gs
125.7 mT
 1.33 kg / 2.93 LBS
1327.0 g / 13.0 N
 low risk
15 mm 671 Gs
67.1 mT
 0.38 kg / 0.83 LBS
378.5 g / 3.7 N
 low risk
20 mm 386 Gs
38.6 mT
 0.13 kg / 0.28 LBS
125.0 g / 1.2 N
 low risk
30 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 LBS
20.4 g / 0.2 N
 low risk
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 LBS
1.5 g / 0.0 N
 low risk
Magnetic force drops drastically with every subsequent millimeter of distance. Remember that even the smallest gap (e.g., dirt, varnish, veneer) strongly weakens the grip. Magnetic products hold most effectively in perfect adhesion; distance nullifies the power. See how quickly the load capacity drop, when the magnet does not adhere directly to the metal substrate. When designing the assembly, discard unnecessary gaps.

Table 2: Shear load (wall)
MW 21.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.93 kg / 6.46 LBS
2930.0 g / 28.7 N
1 mm Stal (~0.2) 2.46 kg / 5.43 LBS
2462.0 g / 24.2 N
2 mm Stal (~0.2) 2.02 kg / 4.44 LBS
2016.0 g / 19.8 N
3 mm Stal (~0.2) 1.62 kg / 3.57 LBS
1618.0 g / 15.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 LBS
994.0 g / 9.8 N
10 mm Stal (~0.2) 0.27 kg / 0.59 LBS
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.08 kg / 0.17 LBS
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 LBS
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section defines the estimated holding capacity necessary to initiate the shifting of the magnet downwards on a vertical steel plate (assuming standard friction coefficient). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 21.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.40 kg / 9.69 LBS
4395.0 g / 43.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.93 kg / 6.46 LBS
2930.0 g / 28.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.47 kg / 3.23 LBS
1465.0 g / 14.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.33 kg / 16.15 LBS
7325.0 g / 71.9 N
When placing a magnet on a vertical surface (e.g., a fridge), it you can count on barely approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slide down faster than they pop off the substrate. Want to create a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a noticeably lighter cargo. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 21.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.73 kg / 1.61 LBS
732.5 g / 7.2 N
1 mm
13%
 1.83 kg / 4.04 LBS
1831.3 g / 18.0 N
2 mm
25%
 3.66 kg / 8.07 LBS
3662.5 g / 35.9 N
3 mm
38%
 5.49 kg / 12.11 LBS
5493.8 g / 53.9 N
5 mm
63%
 9.16 kg / 20.19 LBS
9156.3 g / 89.8 N
10 mm
100%
 14.65 kg / 32.30 LBS
14650.0 g / 143.7 N
11 mm
100%
 14.65 kg / 32.30 LBS
14650.0 g / 143.7 N
12 mm
100%
 14.65 kg / 32.30 LBS
14650.0 g / 143.7 N
A too thin steel cannot focus the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MW 21.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.65 kg / 32.30 LBS
14650.0 g / 143.7 N
 OK
40 °C -2.2% 14.33 kg / 31.59 LBS
14327.7 g / 140.6 N
 OK
60 °C -4.4% 14.01 kg / 30.88 LBS
14005.4 g / 137.4 N
80 °C -6.6% 13.68 kg / 30.17 LBS
13683.1 g / 134.2 N
100 °C -28.8% 10.43 kg / 23.00 LBS
10430.8 g / 102.3 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly demagnetize this product. With every degree above norm, the magnet's force briefly decreases. Avoid using this product near heat sources exceeding its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 21.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 40.53 kg / 89.35 LBS
5 433 Gs
6.08 kg / 13.40 LBS
6079 g / 59.6 N
 N/A
1 mm 37.31 kg / 82.26 LBS
8 017 Gs
5.60 kg / 12.34 LBS
5597 g / 54.9 N
 33.58 kg / 74.03 LBS
~0 Gs
2 mm 34.07 kg / 75.11 LBS
7 660 Gs
5.11 kg / 11.27 LBS
5110 g / 50.1 N
 30.66 kg / 67.60 LBS
~0 Gs
3 mm 30.92 kg / 68.16 LBS
7 297 Gs
4.64 kg / 10.22 LBS
4637 g / 45.5 N
 27.82 kg / 61.34 LBS
~0 Gs
5 mm 25.04 kg / 55.20 LBS
6 567 Gs
3.76 kg / 8.28 LBS
3756 g / 36.8 N
 22.54 kg / 49.68 LBS
~0 Gs
10 mm 13.74 kg / 30.29 LBS
4 865 Gs
2.06 kg / 4.54 LBS
2061 g / 20.2 N
 12.37 kg / 27.26 LBS
~0 Gs
20 mm 3.67 kg / 8.09 LBS
2 515 Gs
0.55 kg / 1.21 LBS
551 g / 5.4 N
 3.30 kg / 7.28 LBS
~0 Gs
50 mm 0.13 kg / 0.29 LBS
476 Gs
0.02 kg / 0.04 LBS
20 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
60 mm 0.06 kg / 0.12 LBS
312 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
70 mm 0.03 kg / 0.06 LBS
214 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
80 mm 0.01 kg / 0.03 LBS
153 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
90 mm 0.01 kg / 0.02 LBS
113 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.01 LBS
86 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a wider radius than a magnet and sheet combination. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
* Estimates apply to sliding force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 21.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field is a serious hazard to electronics as well as medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 21.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.23 km/h
(6.73 m/s)
 0.64 J
30 mm 39.81 km/h
(11.06 m/s)
 1.73 J
50 mm 51.36 km/h
(14.27 m/s)
 2.87 J
100 mm 72.63 km/h
(20.17 m/s)
 5.75 J
NdFeB products are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can cause material chips or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Use safety goggles when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 21.9x10 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MW 21.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 059 Mx 160.6 µWb
Pc Coefficient 0.55 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MW 21.9x10 / N38

Environment Effective steel pull Effect
Air (land) 14.65 kg Standard
Water (riverbed) 16.77 kg
(+2.12 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!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55

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 and environmental data
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: 010045-2026
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This product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø21.9x10 mm, guarantees optimal power. The MW 21.9x10 / N38 model 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. 14.65 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
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 143.71 N with a weight of only 28.25 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 21.9.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest magnets in the same volume (Ø21.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø21.9x10 mm, which, at a weight of 28.25 g, makes it an element with high magnetic energy density. The value of 143.71 N means that the magnet is capable of holding a weight many times exceeding its own mass of 28.25 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet 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 most desirable 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.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost 10 years – the loss is just ~1% (based on simulations),
  • They do not lose their magnetic properties even under strong external field,
  • By covering with a lustrous layer of nickel, the element has an aesthetic look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in shaping and the capacity to customize to client solutions,
  • Universal use in innovative solutions – they are commonly used in HDD drives, electric motors, medical equipment, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose their force 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
  • 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 and corrosion.
  • Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The declared magnet strength represents the peak performance, obtained under optimal environment, specifically:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • with a thickness minimum 10 mm
  • characterized by even structure
  • without any clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • in neutral thermal conditions

Key elements affecting lifting force

Holding efficiency is affected by working environment parameters, mainly (from most important):
  • Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Steel type – low-carbon steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and use protective gear.

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Handling rules

Handle with care. Rare earth magnets attract from a distance and snap with massive power, often faster than you can move away.

Choking Hazard

Neodymium magnets are not suitable for play. Eating multiple magnets can lead to them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.

Heat warning

Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Data carriers

Very strong magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Crushing force

Large magnets can smash fingers instantly. Do not put your hand betwixt two attracting surfaces.

Fragile material

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Dust is flammable

Powder produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?