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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

see parameters »

15.50 ZŁ with VAT / pcs + price for transport

12.60 ZŁ net + 23% VAT / pcs

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Technical - 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

Technical modeling of the magnet - report

These values are the direct effect of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Operational conditions may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
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
 critical level
1 mm 3830 Gs
383.0 mT
 12.31 kg / 27.15 lbs
12314.7 g / 120.8 N
 critical level
2 mm 3466 Gs
346.6 mT
 10.08 kg / 22.23 lbs
10083.5 g / 98.9 N
 critical level
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
Pulling power weakens significantly per each millimeter of distance. Remember that even the smallest gap (e.g., contamination, varnish, rust) noticeably diminishes the holding power. Neodymiums work most effectively at the point of direct contact; gap weakens the force. Analyze how quickly the parameters plummet, when the magnet does not touch tightly to the steel surface. When designing the mounting, avoid additional spacers.

Table 2: Vertical force (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 indicates the approximate holding capacity needed to initiate the slippage of the magnet vertically against a vertical metal surface (considering typical friction coefficient). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 hanging a holder on a vertical surface (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip cause that magnets slip faster than they pull off. Designing a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will slide down under a significantly smaller weight. Using a rubber pad can effectively improve the result.

Table 4: Steel thickness (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 entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (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
Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – heat can permanently demagnetize this product. With increasing heat, the magnet's force momentarily lowers. Avoid using this product in hot environments higher than its working range. Exceeding the critical threshold will lead to destruction of magnetism.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 21.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnets interact from a much further distance than a magnet and sheet combination. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. 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 large.
*Field value between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Attention: Calculations demonstrate friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
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
Mechanical watch 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 real danger to electronic devices as well as pacemakers. These neodymiums produce a flux that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - 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. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to skin. Be sure to control the product during mounting 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 magnet. Use safety goggles when working with large magnets.

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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 21.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 059 Mx 160.6 µWb
Pc Coefficient 0.55 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits 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) = 0.55

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 specification and ecology
Elemental analysis
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: 010045-2026
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The presented product is a very strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø21.9x10 mm, guarantees maximum efficiency. This specific item features an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 14.65 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 143.71 N with a weight of only 28.25 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, 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 automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø21.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 21.9 mm and height 10 mm. The key parameter here is the lifting capacity amounting to approximately 14.65 kg (force ~143.71 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 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. 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 as well as cons of Nd2Fe14B magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the reflective layer of silver, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the option of free forming and adaptation to custom requirements, magnetic components can be produced in a wide range of geometric configurations, which increases their versatility,
  • Wide application in innovative solutions – they find application in computer drives, brushless drives, precision medical tools, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in compact constructions

Cons

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force was determined for ideal contact conditions, including:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • with a cross-section of at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Real force impacted by specific conditions, such as (from priority):
  • Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the flux to be lost into the air.
  • Steel type – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with neodymium magnets
Protect data

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Skin irritation risks

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

GPS and phone interference

A powerful magnetic field disrupts the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, causing severe trauma. Keep away from kids and pets.

Permanent damage

Watch the temperature. Exposing the magnet to high heat will ruin its properties and pulling force.

Beware of splinters

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

ICD Warning

Individuals with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can stop the operation of the implant.

Dust is flammable

Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Bone fractures

Protect your hands. Two large magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Respect the power

Use magnets consciously. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their power.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?