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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 / 23.65 N

Magnetic Induction

150.34 mT / 1503 Gs

Coating

[NiCuNi] Nickel

technical parameters »

2.51 ZŁ with VAT / pcs + price for transport

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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 / 23.65 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 product - report

The following data represent the outcome of a physical analysis. Values rely on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - 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
Magnetic force drops significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) significantly diminishes the holding power. Magnets work most effectively during direct contact; air break drastically cuts the power. Notice how flashily the pull force plummet, when the magnet does not adhere tightly to the metal substrate. When designing the assembly, avoid 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 table below calculates the approximate weight limit necessary to cause the sliding of the magnet downwards against a upright steel plate (considering typical friction). This parameter is a function of the gap size 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 mounting a element on a vertical plane (e.g., a fridge), it will maintain barely approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient influence the fact that products slide down faster than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slip down under a much lighter load. Application of an anti-slip coating can significantly 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 is incapable of take in the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on delicate walls (e.g., car bodies), the holder holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - 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
Classic neodymiums lose parameters past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly destroy this magnet. With increasing heat, the magnet's power temporarily decreases. Do not use this magnet near heat sources higher than its safe range. Exceeding the critical threshold will lead to destruction of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 magnetic products attract each other from a much further distance than a magnet and sheet setup. The setup of magnet-to-magnet generates a stronger field and a larger range of operation. Planning to create a strong closure? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is slightly lower than the connection force, but still large.
*The magnetic induction for N-N configuration is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Estimates refer to friction force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni layer).

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
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
Extremely neodym field is a large risk to electronics and medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
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
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when working 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction 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. Essential parameter for generator designers and motors. Pc value 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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*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.

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%
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
Measurement Calculator
Pulling force
Field Strength
Simply complete one field, to let the calculator fill in the rest instantly.

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The presented product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø20x2.5 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.41 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 23.65 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, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability 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 professional neodymium magnets, offering an optimal price-to-power ratio 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 available off-the-shelf in our store.
This model is characterized by dimensions Ø20x2.5 mm, which, at a weight of 5.89 g, makes it an element with impressive magnetic energy density. The value of 23.65 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 oxidation, giving it an aesthetic, silvery shine.
This rod magnet 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. 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain attractive force for almost ten years – the drop is just ~1% (in theory),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature 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 shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the capacity to adapt to specific needs,
  • Fundamental importance in modern industrial fields – they are commonly used in data components, electric motors, medical devices, as well as multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest 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 casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The specified lifting capacity represents the limit force, recorded under optimal environment, specifically:
  • using a sheet made of low-carbon steel, functioning as a circuit closing element
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • with direct contact (no coatings)
  • under vertical force vector (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

Effective lifting capacity impacted by working environment parameters, including (from most important):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
  • Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Choking Hazard

Absolutely store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.

Protective goggles

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

Operating temperature

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

Machining danger

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Hand protection

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Phone sensors

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

Data carriers

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

Medical implants

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Conscious usage

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98