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MW 21.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010045

GTIN/EAN: 5906301810445

Load capacity 14.65 kg / 143.71 N Magnetic Induction 417.89 mT / 4179 Gs
Diameter Ø
21.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
28.25 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel
product parameters »

15.50 zł with VAT / pcs + price for transport

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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

Physical analysis of the magnet - technical parameters

Presented data are the direct effect of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - characteristics
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 pounds
14650.0 g / 143.7 N
 dangerous!
1 mm 3830 Gs
383.0 mT
 12.31 kg / 27.15 pounds
12314.7 g / 120.8 N
 dangerous!
2 mm 3466 Gs
346.6 mT
 10.08 kg / 22.23 pounds
10083.5 g / 98.9 N
 dangerous!
3 mm 3104 Gs
310.4 mT
 8.09 kg / 17.83 pounds
8086.3 g / 79.3 N
 strong
5 mm 2432 Gs
243.2 mT
 4.97 kg / 10.95 pounds
4966.5 g / 48.7 N
 strong
10 mm 1257 Gs
125.7 mT
 1.33 kg / 2.93 pounds
1327.0 g / 13.0 N
 safe
15 mm 671 Gs
67.1 mT
 0.38 kg / 0.83 pounds
378.5 g / 3.7 N
 safe
20 mm 386 Gs
38.6 mT
 0.13 kg / 0.28 pounds
125.0 g / 1.2 N
 safe
30 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 pounds
20.4 g / 0.2 N
 safe
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 safe
Grip strength decreases significantly per each millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, paint, dust) noticeably weakens the grip. Neodymiums work optimally at the point of direct contact; distance kills the power. See how flashily the parameters plummet, when the magnet does not touch flatly to the metal substrate. When designing the arrangement, avoid redundant distances.

Table 2: Vertical hold (vertical surface)
MW 21.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
1 mm Stal (~0.2) 2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
2 mm Stal (~0.2) 2.02 kg / 4.44 pounds
2016.0 g / 19.8 N
3 mm Stal (~0.2) 1.62 kg / 3.57 pounds
1618.0 g / 15.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 pounds
994.0 g / 9.8 N
10 mm Stal (~0.2) 0.27 kg / 0.59 pounds
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.08 kg / 0.17 pounds
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data calculates the estimated holding capacity needed to cause the sliding of the magnet downwards against a upright metal surface (considering typical friction). This value depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
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 pounds
4395.0 g / 43.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.47 kg / 3.23 pounds
1465.0 g / 14.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.33 kg / 16.15 pounds
7325.0 g / 71.9 N
When mounting a magnet on a vertical surface (e.g., a board), it will only hold only about 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that magnets slide down easier than they pull off. Planning a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a significantly smaller cargo. Utilizing a rubberized layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MW 21.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.73 kg / 1.61 pounds
732.5 g / 7.2 N
1 mm
13%
 1.83 kg / 4.04 pounds
1831.3 g / 18.0 N
2 mm
25%
 3.66 kg / 8.07 pounds
3662.5 g / 35.9 N
3 mm
38%
 5.49 kg / 12.11 pounds
5493.8 g / 53.9 N
5 mm
63%
 9.16 kg / 20.19 pounds
9156.3 g / 89.8 N
10 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
11 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
12 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a weak sheet, the flux will pass right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the product works worse. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
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 pounds
14650.0 g / 143.7 N
 OK
40 °C -2.2% 14.33 kg / 31.59 pounds
14327.7 g / 140.6 N
 OK
60 °C -4.4% 14.01 kg / 30.88 pounds
14005.4 g / 137.4 N
80 °C -6.6% 13.68 kg / 30.17 pounds
13683.1 g / 134.2 N
100 °C -28.8% 10.43 kg / 23.00 pounds
10430.8 g / 102.3 N
Classic neodymiums change their properties strength after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this product. With every degree above norm, the neodymium's power temporarily lowers. Avoid using this product close to heaters higher than its safe range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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 pounds
5 433 Gs
6.08 kg / 13.40 pounds
6079 g / 59.6 N
 N/A
1 mm 37.31 kg / 82.26 pounds
8 017 Gs
5.60 kg / 12.34 pounds
5597 g / 54.9 N
 33.58 kg / 74.03 pounds
~0 Gs
2 mm 34.07 kg / 75.11 pounds
7 660 Gs
5.11 kg / 11.27 pounds
5110 g / 50.1 N
 30.66 kg / 67.60 pounds
~0 Gs
3 mm 30.92 kg / 68.16 pounds
7 297 Gs
4.64 kg / 10.22 pounds
4637 g / 45.5 N
 27.82 kg / 61.34 pounds
~0 Gs
5 mm 25.04 kg / 55.20 pounds
6 567 Gs
3.76 kg / 8.28 pounds
3756 g / 36.8 N
 22.54 kg / 49.68 pounds
~0 Gs
10 mm 13.74 kg / 30.29 pounds
4 865 Gs
2.06 kg / 4.54 pounds
2061 g / 20.2 N
 12.37 kg / 27.26 pounds
~0 Gs
20 mm 3.67 kg / 8.09 pounds
2 515 Gs
0.55 kg / 1.21 pounds
551 g / 5.4 N
 3.30 kg / 7.28 pounds
~0 Gs
50 mm 0.13 kg / 0.29 pounds
476 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
 0.12 kg / 0.26 pounds
~0 Gs
60 mm 0.06 kg / 0.12 pounds
312 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
70 mm 0.03 kg / 0.06 pounds
214 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
80 mm 0.01 kg / 0.03 pounds
153 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
113 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
86 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a larger range of operation. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Results demonstrate shear force of a pair of same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - 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
Remote 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 poses a large risk to IT equipment and medical implants. These NdFeB products generate a field that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 21.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.32 km/h
(6.48 m/s)
 0.59 J
30 mm 24.35 km/h
(6.76 m/s)
 0.65 J
50 mm 24.37 km/h
(6.77 m/s)
 0.65 J
100 mm 24.37 km/h
(6.77 m/s)
 0.65 J
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
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: 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 passing through the pole surface. Essential parameter in coil applications 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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Warning: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

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

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.

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%

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
Measurement Calculator

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The presented product is an exceptionally strong cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø21.9x10 mm, guarantees the highest energy density. The MW 21.9x10 / N38 component boasts a tolerance of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 14.65 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 143.71 N with a weight of only 28.25 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 available off-the-shelf in our warehouse.
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 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (theoretically),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • In other words, due to the glossy layer of silver, the element is aesthetically pleasing,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Due to the potential of precise forming and adaptation to unique requirements, NdFeB magnets can be created in a broad palette of shapes and sizes, which amplifies use scope,
  • Fundamental importance in modern technologies – they are used in magnetic memories, drive modules, advanced medical instruments, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

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 using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown represents the limit force, recorded under laboratory conditions, meaning:
  • using a base made of high-permeability steel, acting as a magnetic yoke
  • with a thickness of at least 10 mm
  • characterized by even structure
  • without any air gap between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:
  • Distance (between the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Risk of cracking

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Product not for children

Absolutely keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.

Serious injuries

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Demagnetization risk

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

Do not underestimate power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Warning for heart patients

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Warning for allergy sufferers

Some people experience a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to a rash. It is best to use safety gloves.

Cards and drives

Powerful magnetic fields can destroy records on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Combustion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Magnetic interference

Note: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.

Attention! More info about hazards in the article: Safety of working with magnets.