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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

see properties »

3.01 ZŁ with VAT / pcs + price for transport

2.45 ZŁ net + 23% VAT / pcs

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Technical details - 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

Physical analysis of the magnet - technical parameters

The following values represent the result of a engineering calculation. Results rely on models for the class Nd2Fe14B. Operational conditions may differ. Treat these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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
 medium risk
1 mm 1431 Gs
143.1 mT
 2.18 kg / 4.82 lbs
2184.9 g / 21.4 N
 medium risk
2 mm 1328 Gs
132.8 mT
 1.88 kg / 4.15 lbs
1882.0 g / 18.5 N
 low risk
3 mm 1206 Gs
120.6 mT
 1.55 kg / 3.42 lbs
1552.2 g / 15.2 N
 low risk
5 mm 947 Gs
94.7 mT
 0.96 kg / 2.11 lbs
957.1 g / 9.4 N
 low risk
10 mm 457 Gs
45.7 mT
 0.22 kg / 0.49 lbs
223.1 g / 2.2 N
 low risk
15 mm 224 Gs
22.4 mT
 0.05 kg / 0.12 lbs
53.7 g / 0.5 N
 low risk
20 mm 120 Gs
12.0 mT
 0.02 kg / 0.03 lbs
15.4 g / 0.2 N
 low risk
30 mm 44 Gs
4.4 mT
 0.00 kg / 0.00 lbs
2.1 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 low risk
Grip strength decreases significantly with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) strongly diminishes the holding power. Neodymiums operate strongest during direct contact; distance weakens the power. Notice how quickly the parameters fall, when the product does not adhere directly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Slippage 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
The following data presents the theoretical shear load needed to start the downward movement of the magnet down along a vertical steel wall (considering standard friction). This value is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 upright wall (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets slip faster than they detach. Want to create a hanger? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a noticeably lighter cargo. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (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 cannot absorb the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal resistance (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 change their properties strength above the temperature limit. Avoid high temperatures – heat can permanently demagnetize this product. As the temperature rises, the neodymium's power briefly drops. Refrain from using this magnet close to ovens higher than its safe range. Too high temperature will lead to permanent loss of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 20x2.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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. Such a system of magnet-to-magnet produces a massive flux and a further horizon of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Results demonstrate friction force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (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
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 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
Powerful magnet radiation is a serious hazard to IT equipment as well as pacemakers. These magnets generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - 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 collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can destroy the magnet 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 ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 emitted by the pole surface. Key data in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Corrosion 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. Shear force

*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

*For N38 material, 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.

Engineering data and GPSR
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%
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: 010042-2026
Quick Unit Converter
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The offered product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø20x2.5 mm, guarantees the highest energy density. This specific item features a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 2.41 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 23.63 N with a weight of only 5.89 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 immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority 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 (Ø20x2.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 2.5 mm. The value of 23.63 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.89 g. 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 2.5 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 diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even during around 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining as well as adapting to precise requirements,
  • Key role in high-tech industry – they are used in mass storage devices, brushless drives, medical equipment, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these magnets can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

The declared magnet strength concerns the peak performance, recorded under laboratory conditions, namely:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

In real-world applications, the real power depends on many variables, listed from the most important:
  • Air gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the flux to be lost to the other side.
  • Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Warnings
Compass and GPS

Remember: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.

Respect the power

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Nickel coating and allergies

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and choose versions in plastic housing.

Fire warning

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Heat warning

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Data carriers

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Magnets are brittle

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Warning for heart patients

Patients with a heart stimulator must keep an safe separation from magnets. The magnetism can disrupt the functioning of the implant.

Danger to the youngest

Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Crushing force

Big blocks can smash fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

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