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MW 20x2.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010042

GTIN/EAN: 5906301810414

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

2.5 mm [±0,1 mm]

Weight

5.89 g

Magnetization Direction

↑ axial

Load capacity

2.41 kg / 23.63 N

Magnetic Induction

150.34 mT / 1503 Gs

Coating

[NiCuNi] Nickel

technical specifications »

3.01 ZŁ with VAT / pcs + price for transport

2.45 ZŁ net + 23% VAT / pcs

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Technical - MW 20x2.5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x2.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010042
GTIN/EAN 5906301810414
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 2.5 mm [±0,1 mm]
Weight 5.89 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.41 kg / 23.63 N
Magnetic Induction ~ ? 150.34 mT / 1503 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x2.5 / 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

Engineering simulation of the magnet - data

The following data represent the direct effect of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational conditions may differ. Use these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - power drop
MW 20x2.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1503 Gs
150.3 mT
 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
 warning
1 mm 1431 Gs
143.1 mT
 2.18 kg / 4.82 lbs
2184.9 g / 21.4 N
 warning
2 mm 1328 Gs
132.8 mT
 1.88 kg / 4.15 lbs
1882.0 g / 18.5 N
 safe
3 mm 1206 Gs
120.6 mT
 1.55 kg / 3.42 lbs
1552.2 g / 15.2 N
 safe
5 mm 947 Gs
94.7 mT
 0.96 kg / 2.11 lbs
957.1 g / 9.4 N
 safe
10 mm 457 Gs
45.7 mT
 0.22 kg / 0.49 lbs
223.1 g / 2.2 N
 safe
15 mm 224 Gs
22.4 mT
 0.05 kg / 0.12 lbs
53.7 g / 0.5 N
 safe
20 mm 120 Gs
12.0 mT
 0.02 kg / 0.03 lbs
15.4 g / 0.2 N
 safe
30 mm 44 Gs
4.4 mT
 0.00 kg / 0.00 lbs
2.1 g / 0.0 N
 safe
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 safe
Grip strength drops significantly with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, varnish, dust) noticeably weakens the grip. Neodymiums work most effectively during direct contact; distance drastically cuts the force. Notice how rapidly the pull force drop, when the product does not touch directly to the steel surface. When calculating the arrangement, avoid redundant distances.

Table 2: Shear load (vertical surface)
MW 20x2.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.48 kg / 1.06 lbs
482.0 g / 4.7 N
1 mm Stal (~0.2) 0.44 kg / 0.96 lbs
436.0 g / 4.3 N
2 mm Stal (~0.2) 0.38 kg / 0.83 lbs
376.0 g / 3.7 N
3 mm Stal (~0.2) 0.31 kg / 0.68 lbs
310.0 g / 3.0 N
5 mm Stal (~0.2) 0.19 kg / 0.42 lbs
192.0 g / 1.9 N
10 mm Stal (~0.2) 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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
This section shows the estimated weight limit required to initiate the shifting of the magnet down against a upright metal surface (considering typical friction). This value is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MW 20x2.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.72 kg / 1.59 lbs
723.0 g / 7.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.48 kg / 1.06 lbs
482.0 g / 4.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.24 kg / 0.53 lbs
241.0 g / 2.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.21 kg / 2.66 lbs
1205.0 g / 11.8 N
When placing a holder on a vertical plane (e.g., a board), it will maintain only about 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that products move down easier than they detach. Designing a hanger? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a significantly smaller weight. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 20x2.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.24 kg / 0.53 lbs
241.0 g / 2.4 N
1 mm
25%
 0.60 kg / 1.33 lbs
602.5 g / 5.9 N
2 mm
50%
 1.21 kg / 2.66 lbs
1205.0 g / 11.8 N
3 mm
75%
 1.81 kg / 3.98 lbs
1807.5 g / 17.7 N
5 mm
100%
 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
10 mm
100%
 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
11 mm
100%
 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
12 mm
100%
 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
A thin sheet is incapable of focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a too thin substrate, the flux will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you need a suitably thick backing of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We recommend selecting the steel dimension based on the following data.

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.41 kg / 5.31 lbs
2410.0 g / 23.6 N
 OK
40 °C -2.2% 2.36 kg / 5.20 lbs
2357.0 g / 23.1 N
 OK
60 °C -4.4% 2.30 kg / 5.08 lbs
2304.0 g / 22.6 N
80 °C -6.6% 2.25 kg / 4.96 lbs
2250.9 g / 22.1 N
100 °C -28.8% 1.72 kg / 3.78 lbs
1715.9 g / 16.8 N
Ordinary NdFeB products irreversibly lose power above the temperature limit. Protect against heat – high temperature can irreversibly damage this magnet. As the temperature rises, the neodymium's capacity briefly lowers. Refrain from using this product close to heaters exceeding its safe range. Ignoring the limit will result in destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 20x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.38 kg / 9.65 lbs
2 771 Gs
0.66 kg / 1.45 lbs
656 g / 6.4 N
 N/A
1 mm 4.20 kg / 9.25 lbs
2 944 Gs
0.63 kg / 1.39 lbs
629 g / 6.2 N
 3.78 kg / 8.33 lbs
~0 Gs
2 mm 3.97 kg / 8.75 lbs
2 862 Gs
0.60 kg / 1.31 lbs
595 g / 5.8 N
 3.57 kg / 7.87 lbs
~0 Gs
3 mm 3.70 kg / 8.17 lbs
2 766 Gs
0.56 kg / 1.22 lbs
556 g / 5.5 N
 3.33 kg / 7.35 lbs
~0 Gs
5 mm 3.12 kg / 6.88 lbs
2 538 Gs
0.47 kg / 1.03 lbs
468 g / 4.6 N
 2.81 kg / 6.19 lbs
~0 Gs
10 mm 1.74 kg / 3.83 lbs
1 895 Gs
0.26 kg / 0.57 lbs
261 g / 2.6 N
 1.56 kg / 3.45 lbs
~0 Gs
20 mm 0.41 kg / 0.89 lbs
915 Gs
0.06 kg / 0.13 lbs
61 g / 0.6 N
 0.36 kg / 0.80 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
140 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
88 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
58 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
41 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
29 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
22 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and steel combination. The connection of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The repulsion force is marginally weaker than the attraction, but still large.
*Field value in repulsion mode reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
* Estimates refer to friction force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MW 20x2.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a real danger to electronics and pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 20x2.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.55 km/h
(5.99 m/s)
 0.11 J
30 mm 35.35 km/h
(9.82 m/s)
 0.28 J
50 mm 45.62 km/h
(12.67 m/s)
 0.47 J
100 mm 64.51 km/h
(17.92 m/s)
 0.95 J
Neodymium magnets are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MW 20x2.5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MW 20x2.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 996 Mx 60.0 µWb
Pc Coefficient 0.19 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 20x2.5 / N38

Environment Effective steel pull Effect
Air (land) 2.41 kg Standard
Water (riverbed) 2.76 kg
(+0.35 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Note: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Power loss vs temp

*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) = 0.19

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: 010042-2026
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This product is an incredibly powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø20x2.5 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 2.41 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 23.63 N with a weight of only 5.89 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using epoxy glues. 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.
Magnets N38 are strong enough for the majority 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 (Ø20x2.5), 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 Ø20x2.5 mm, which, at a weight of 5.89 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 2.41 kg (force ~23.63 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 through the diameter if your project requires it.

Pros and cons of rare earth magnets.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets prove to be extremely resistant to magnetic field loss caused by external magnetic fields,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They feature 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 form) at temperatures up to 230°C and above...
  • Due to the option of free forming and customization to specialized needs, NdFeB magnets can be manufactured in a wide range of geometric configurations, which makes them more universal,
  • Huge importance in modern industrial fields – they are used in hard drives, electric drive systems, medical devices, as well as multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting capacity of the magnet – what contributes to it?

Breakaway force was determined for ideal contact conditions, taking into account:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Please note that the application force will differ subject to elements below, starting with the most relevant:
  • Air gap (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures lower magnetic permeability and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Life threat

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Hand protection

Large magnets can smash fingers in a fraction of a second. Never put your hand between two attracting surfaces.

Phone sensors

Be aware: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Powerful field

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Machining danger

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Keep away from computers

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Do not overheat magnets

Keep cool. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Allergic reactions

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, immediately stop handling magnets and wear gloves.

No play value

NdFeB magnets are not suitable for play. Swallowing a few magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.

Material brittleness

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

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