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MW 20x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010041

GTIN/EAN: 5906301810407

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

4.71 g

Magnetization Direction

↑ axial

Load capacity

1.63 kg / 16.02 N

Magnetic Induction

121.57 mT / 1216 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

2.08 ZŁ with VAT / pcs + price for transport

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Technical of the product - MW 20x2 / N38 - cylindrical magnet

Specification / characteristics - MW 20x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010041
GTIN/EAN 5906301810407
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 20 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 4.71 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.63 kg / 16.02 N
Magnetic Induction ~ ? 121.57 mT / 1216 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x2 / 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 analysis of the product - data

These information represent the outcome of a physical simulation. Results are based on models for the class Nd2Fe14B. Operational parameters may differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - characteristics
MW 20x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1216 Gs
121.6 mT
 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
 weak grip
1 mm 1165 Gs
116.5 mT
 1.50 kg / 3.30 lbs
1496.3 g / 14.7 N
 weak grip
2 mm 1087 Gs
108.7 mT
 1.30 kg / 2.87 lbs
1302.7 g / 12.8 N
 weak grip
3 mm 991 Gs
99.1 mT
 1.08 kg / 2.39 lbs
1083.7 g / 10.6 N
 weak grip
5 mm 783 Gs
78.3 mT
 0.68 kg / 1.49 lbs
675.9 g / 6.6 N
 weak grip
10 mm 379 Gs
37.9 mT
 0.16 kg / 0.35 lbs
158.4 g / 1.6 N
 weak grip
15 mm 185 Gs
18.5 mT
 0.04 kg / 0.08 lbs
37.9 g / 0.4 N
 weak grip
20 mm 99 Gs
9.9 mT
 0.01 kg / 0.02 lbs
10.8 g / 0.1 N
 weak grip
30 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 weak grip
50 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Magnetic force decreases sharply with every subsequent millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) strongly weakens the grip. Magnetic products operate optimally during direct contact; gap nullifies the power. Notice how rapidly the pull force fall, when the magnet does not touch tightly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Vertical hold (vertical surface)
MW 20x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.33 kg / 0.72 lbs
326.0 g / 3.2 N
1 mm Stal (~0.2) 0.30 kg / 0.66 lbs
300.0 g / 2.9 N
2 mm Stal (~0.2) 0.26 kg / 0.57 lbs
260.0 g / 2.6 N
3 mm Stal (~0.2) 0.22 kg / 0.48 lbs
216.0 g / 2.1 N
5 mm Stal (~0.2) 0.14 kg / 0.30 lbs
136.0 g / 1.3 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
32.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the approximate force necessary to start the downward movement of the magnet vertically against a upright steel plate (assuming typical friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.49 kg / 1.08 lbs
489.0 g / 4.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.33 kg / 0.72 lbs
326.0 g / 3.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.16 kg / 0.36 lbs
163.0 g / 1.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.82 kg / 1.80 lbs
815.0 g / 8.0 N
When mounting a magnet on a upright wall (e.g., a car body), it will maintain just about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip mean that products slip faster than they pull off. Planning a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Application of an anti-slip pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 20x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.16 kg / 0.36 lbs
163.0 g / 1.6 N
1 mm
25%
 0.41 kg / 0.90 lbs
407.5 g / 4.0 N
2 mm
50%
 0.82 kg / 1.80 lbs
815.0 g / 8.0 N
3 mm
75%
 1.22 kg / 2.70 lbs
1222.5 g / 12.0 N
5 mm
100%
 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
10 mm
100%
 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
11 mm
100%
 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
12 mm
100%
 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
A thin metal plate cannot absorb the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this magnet's potential, you need a suitably thick piece of metal. The saturation effect means that on thin elements (e.g., appliance housings), the product shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MW 20x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.63 kg / 3.59 lbs
1630.0 g / 16.0 N
 OK
40 °C -2.2% 1.59 kg / 3.51 lbs
1594.1 g / 15.6 N
 OK
60 °C -4.4% 1.56 kg / 3.44 lbs
1558.3 g / 15.3 N
80 °C -6.6% 1.52 kg / 3.36 lbs
1522.4 g / 14.9 N
100 °C -28.8% 1.16 kg / 2.56 lbs
1160.6 g / 11.4 N
Standard neodymium magnets change their properties parameters above the temperature limit. Avoid high temperatures – heat can irreversibly destroy this magnet. As the temperature rises, the magnet's power temporarily drops. Refrain from using this product near heat sources exceeding its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization 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 20x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.86 kg / 6.31 lbs
2 301 Gs
0.43 kg / 0.95 lbs
429 g / 4.2 N
 N/A
1 mm 2.76 kg / 6.09 lbs
2 388 Gs
0.41 kg / 0.91 lbs
414 g / 4.1 N
 2.49 kg / 5.48 lbs
~0 Gs
2 mm 2.63 kg / 5.79 lbs
2 329 Gs
0.39 kg / 0.87 lbs
394 g / 3.9 N
 2.36 kg / 5.21 lbs
~0 Gs
3 mm 2.47 kg / 5.44 lbs
2 257 Gs
0.37 kg / 0.82 lbs
370 g / 3.6 N
 2.22 kg / 4.89 lbs
~0 Gs
5 mm 2.10 kg / 4.62 lbs
2 081 Gs
0.31 kg / 0.69 lbs
315 g / 3.1 N
 1.89 kg / 4.16 lbs
~0 Gs
10 mm 1.19 kg / 2.62 lbs
1 565 Gs
0.18 kg / 0.39 lbs
178 g / 1.7 N
 1.07 kg / 2.35 lbs
~0 Gs
20 mm 0.28 kg / 0.61 lbs
758 Gs
0.04 kg / 0.09 lbs
42 g / 0.4 N
 0.25 kg / 0.55 lbs
~0 Gs
50 mm 0.01 kg / 0.01 lbs
115 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
72 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
48 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
33 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
24 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
18 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a larger range of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The levitation is slightly lower than the connection force, but still impressive.
*Field value between like poles is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Results show shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 20x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a large risk to electronic devices and pacemakers. These neodymiums produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation penetrates the body and glass. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 20x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.87 km/h
(5.52 m/s)
 0.07 J
30 mm 32.51 km/h
(9.03 m/s)
 0.19 J
50 mm 41.95 km/h
(11.65 m/s)
 0.32 J
100 mm 59.33 km/h
(16.48 m/s)
 0.64 J
NdFeB products are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MW 20x2 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 20x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 038 Mx 50.4 µWb
Pc Coefficient 0.16 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 20x2 / N38

Environment Effective steel pull Effect
Air (land) 1.63 kg Standard
Water (riverbed) 1.87 kg
(+0.24 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.16

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 and environmental data
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Sustainability
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: 010041-2026
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The offered product is a very strong cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø20x2 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 1.63 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 16.02 N with a weight of only 4.71 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø20x2), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø20x2 mm, which, at a weight of 4.71 g, makes it an element with high magnetic energy density. The value of 16.02 N means that the magnet is capable of holding a weight many times exceeding its own mass of 4.71 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. 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 neodymium magnets.

Benefits

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They retain attractive force for around 10 years – the loss is just ~1% (in theory),
  • Magnets perfectly protect themselves against demagnetization caused by external fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets possess extremely high magnetic induction on the surface,
  • 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...
  • Thanks to flexibility in designing and the capacity to modify to specific needs,
  • Universal use in innovative solutions – they serve a role in data components, electric drive systems, medical equipment, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing threads in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Highest magnetic holding force – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • on a base made of mild steel, optimally conducting the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by even structure
  • without any air gap between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Key elements affecting lifting force

Effective lifting capacity impacted by working environment parameters, mainly (from priority):
  • Gap (betwixt the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not accept the full field, causing part of the flux to be wasted into the air.
  • Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Warning for heart patients

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Risk of cracking

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Safe distance

Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Impact on smartphones

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Immense force

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Machining danger

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Danger to the youngest

Strictly keep magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Physical harm

Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Allergic reactions

A percentage of the population have a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling can result in an allergic reaction. We suggest use safety gloves.

Safety First! Details about hazards in the article: Safety of working with magnets.