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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

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3.01 ZŁ with VAT / pcs + price for transport

2.45 ZŁ net + 23% VAT / pcs

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Technical parameters - 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

Technical analysis of the magnet - technical parameters

These values constitute the result of a physical simulation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance might slightly differ. Please consider these data as a reference point for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
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
 weak grip
3 mm 1206 Gs
120.6 mT
 1.55 kg / 3.42 lbs
1552.2 g / 15.2 N
 weak grip
5 mm 947 Gs
94.7 mT
 0.96 kg / 2.11 lbs
957.1 g / 9.4 N
 weak grip
10 mm 457 Gs
45.7 mT
 0.22 kg / 0.49 lbs
223.1 g / 2.2 N
 weak grip
15 mm 224 Gs
22.4 mT
 0.05 kg / 0.12 lbs
53.7 g / 0.5 N
 weak grip
20 mm 120 Gs
12.0 mT
 0.02 kg / 0.03 lbs
15.4 g / 0.2 N
 weak grip
30 mm 44 Gs
4.4 mT
 0.00 kg / 0.00 lbs
2.1 g / 0.0 N
 weak grip
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Pulling power decreases significantly with every mm of spacing. Remember that every additional insulation layer (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnetic products hold most effectively in perfect adhesion; air break nullifies the force. Analyze how flashily the load capacity fall, when the magnet does not touch directly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

Table 2: Shear hold (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 table below calculates the approximate holding capacity sufficient to start the downward movement of the magnet vertically along a upright steel plate (considering typical friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 hanging a magnet on a vertical surface (e.g., a board), it will maintain only approx. 1/5 of its nominal power. Gravity and a weak degree of grip influence the fact that holders move down easier than they pop off the substrate. Want to create a vertical fastening? Remember that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a significantly smaller load. Using a rubber pad can drastically increase the grip.

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 metal plate cannot take in the full magnetic flux, which weakens actual performance of the magnet. Should 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 full efficiency of this neodymium's potential, you need a suitably thick piece of metal. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (stability) - thermal limit
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
Standard neodymium magnets lose strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this magnet. As the temperature rises, the neodymium's force momentarily decreases. Refrain from using this magnet close to ovens higher than its working range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
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 strong neodymiums attract each other from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet generates a stronger field and a larger range of action. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
* Calculations refer to friction force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
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
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
Powerful magnet radiation is a large risk to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (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
Magnetic elements are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles 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 pole surface. Key data for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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%
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. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely 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) = 0.19

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.

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%
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: 010042-2026
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This product is an incredibly powerful cylindrical magnet, produced from advanced NdFeB material, which, at dimensions of Ø20x2.5 mm, guarantees the highest energy density. This specific item features 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 impressive force (approx. 2.41 kg), this product is in stock from our warehouse in Poland, 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 finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 23.63 N with a weight of only 5.89 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. 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 warehouse.
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.
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. Such an arrangement is most desirable 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 Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during around ten years – the reduction in lifting capacity is only ~1% (theoretically),
  • They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • A magnet with a metallic gold surface has better aesthetics,
  • Magnetic induction on the top side of the magnet is very high,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the ability to modify to unusual requirements,
  • Huge importance in high-tech industry – they find application in mass storage devices, electromotive mechanisms, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose their power 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 during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complicated forms in magnets, we recommend using a housing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness minimum 10 mm
  • characterized by even structure
  • with total lack of distance (without impurities)
  • during detachment in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Please note that the magnet holding will differ subject to elements below, in order of importance:
  • Distance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Bone fractures

Risk of injury: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Thermal limits

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Health Danger

Patients with a heart stimulator should keep an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Magnets are brittle

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Magnetic media

Very strong magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Caution required

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Do not drill into magnets

Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Swallowing risk

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Compass and GPS

A strong magnetic field interferes with the operation of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.

Sensitization to coating

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Important! Details about risks in the article: Magnet Safety Guide.