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MW 20x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010039

GTIN/EAN: 5906301810384

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

3.53 g

Magnetization Direction

↑ axial

Load capacity

0.97 kg / 9.50 N

Magnetic Induction

91.96 mT / 920 Gs

Coating

[NiCuNi] Nickel

technical parameters »

1.574 ZŁ with VAT / pcs + price for transport

1.280 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MW 20x1.5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010039
GTIN/EAN 5906301810384
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 1.5 mm [±0,1 mm]
Weight 3.53 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.97 kg / 9.50 N
Magnetic Induction ~ ? 91.96 mT / 920 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x1.5 / 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 modeling of the assembly - data

Presented values constitute the direct effect of a engineering analysis. Results are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MW 20x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 920 Gs
92.0 mT
 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
 low risk
1 mm 887 Gs
88.7 mT
 0.90 kg / 1.99 LBS
902.2 g / 8.9 N
 low risk
2 mm 832 Gs
83.2 mT
 0.79 kg / 1.75 LBS
794.6 g / 7.8 N
 low risk
3 mm 763 Gs
76.3 mT
 0.67 kg / 1.47 LBS
667.4 g / 6.5 N
 low risk
5 mm 606 Gs
60.6 mT
 0.42 kg / 0.93 LBS
421.6 g / 4.1 N
 low risk
10 mm 294 Gs
29.4 mT
 0.10 kg / 0.22 LBS
99.5 g / 1.0 N
 low risk
15 mm 144 Gs
14.4 mT
 0.02 kg / 0.05 LBS
23.6 g / 0.2 N
 low risk
20 mm 76 Gs
7.6 mT
 0.01 kg / 0.01 LBS
6.7 g / 0.1 N
 low risk
30 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 low risk
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
Pulling power decreases drastically with every subsequent millimeter of distance. Remember that even a very thin break (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnets operate optimally during direct contact; distance kills the force. See how rapidly the pull force plummet, when the magnet does not adhere directly to the steel surface. When calculating the arrangement, avoid additional spacers.

Table 2: Slippage capacity (vertical surface)
MW 20x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.43 LBS
194.0 g / 1.9 N
1 mm Stal (~0.2) 0.18 kg / 0.40 LBS
180.0 g / 1.8 N
2 mm Stal (~0.2) 0.16 kg / 0.35 LBS
158.0 g / 1.5 N
3 mm Stal (~0.2) 0.13 kg / 0.30 LBS
134.0 g / 1.3 N
5 mm Stal (~0.2) 0.08 kg / 0.19 LBS
84.0 g / 0.8 N
10 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 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 following data defines the estimated shear load required to cause the shifting of the magnet vertically along a upright steel plate (considering standard friction coefficient). This value is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 20x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.29 kg / 0.64 LBS
291.0 g / 2.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.43 LBS
194.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 LBS
97.0 g / 1.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.49 kg / 1.07 LBS
485.0 g / 4.8 N
When hanging a magnet on a vertical plane (e.g., a car body), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that products slide down faster than they pop off the substrate. Want to create a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will give way down under a significantly smaller weight. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 20x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.21 LBS
97.0 g / 1.0 N
1 mm
25%
 0.24 kg / 0.53 LBS
242.5 g / 2.4 N
2 mm
50%
 0.49 kg / 1.07 LBS
485.0 g / 4.8 N
3 mm
75%
 0.73 kg / 1.60 LBS
727.5 g / 7.1 N
5 mm
100%
 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
10 mm
100%
 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
11 mm
100%
 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
12 mm
100%
 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
A too thin steel is incapable of focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you require a sufficiently solid element of steel. The saturation effect causes that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We suggest choosing the steel thickness from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 20x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.97 kg / 2.14 LBS
970.0 g / 9.5 N
 OK
40 °C -2.2% 0.95 kg / 2.09 LBS
948.7 g / 9.3 N
 OK
60 °C -4.4% 0.93 kg / 2.04 LBS
927.3 g / 9.1 N
80 °C -6.6% 0.91 kg / 2.00 LBS
906.0 g / 8.9 N
100 °C -28.8% 0.69 kg / 1.52 LBS
690.6 g / 6.8 N
Standard neodymium magnets lose strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly demagnetize this product. As the temperature rises, the magnet's force momentarily decreases. Avoid using this magnet in hot environments exceeding its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 20x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.64 kg / 3.61 LBS
1 781 Gs
0.25 kg / 0.54 LBS
246 g / 2.4 N
 N/A
1 mm 1.59 kg / 3.51 LBS
1 813 Gs
0.24 kg / 0.53 LBS
239 g / 2.3 N
 1.43 kg / 3.16 LBS
~0 Gs
2 mm 1.52 kg / 3.36 LBS
1 774 Gs
0.23 kg / 0.50 LBS
228 g / 2.2 N
 1.37 kg / 3.02 LBS
~0 Gs
3 mm 1.44 kg / 3.17 LBS
1 724 Gs
0.22 kg / 0.48 LBS
216 g / 2.1 N
 1.29 kg / 2.85 LBS
~0 Gs
5 mm 1.24 kg / 2.73 LBS
1 598 Gs
0.19 kg / 0.41 LBS
185 g / 1.8 N
 1.11 kg / 2.45 LBS
~0 Gs
10 mm 0.71 kg / 1.57 LBS
1 212 Gs
0.11 kg / 0.24 LBS
107 g / 1.0 N
 0.64 kg / 1.41 LBS
~0 Gs
20 mm 0.17 kg / 0.37 LBS
589 Gs
0.03 kg / 0.06 LBS
25 g / 0.2 N
 0.15 kg / 0.33 LBS
~0 Gs
50 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
60 mm 0.00 kg / 0.00 LBS
55 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
36 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
25 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
18 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
13 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets generates a stronger field and a further horizon of performance. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Results apply to shear force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MW 20x1.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 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 real danger to electronic devices and medical implants. These NdFeB products produce a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 20x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.76 km/h
(4.93 m/s)
 0.04 J
30 mm 28.97 km/h
(8.05 m/s)
 0.11 J
50 mm 37.38 km/h
(10.38 m/s)
 0.19 J
100 mm 52.87 km/h
(14.69 m/s)
 0.38 J
Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or injury to skin. Hold the magnet firmly during mounting 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 magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Coating parameters (durability)
MW 20x1.5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 20x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 979 Mx 39.8 µWb
Pc Coefficient 0.12 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 20x1.5 / N38

Environment Effective steel pull Effect
Air (land) 0.97 kg Standard
Water (riverbed) 1.11 kg
(+0.14 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Thermal stability

*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) = 0.12

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%
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: 010039-2026
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Field Strength
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This product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø20x1.5 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.97 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 9.50 N with a weight of only 3.53 g, this cylindrical magnet 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 long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø20x1.5), 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 Ø20x1.5 mm, which, at a weight of 3.53 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 0.97 kg (force ~9.50 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 external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 1.5 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.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during approximately 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by magnetic disturbances,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver gives an clean appearance,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate shaping and adjusting to defined needs,
  • Versatile presence in advanced technology sectors – they serve a role in HDD drives, brushless drives, diagnostic systems, as well as multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

What to avoid - cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of creating nuts in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

Magnet power was determined for the most favorable conditions, assuming:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Effective lifting capacity is affected by working environment parameters, such as (from priority):
  • Distance (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic properties and holding force.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the holding force.

H&S for magnets
Protective goggles

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.

Compass and GPS

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Flammability

Dust created during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Allergic reactions

A percentage of the population suffer from a hypersensitivity to Ni, which is the common plating for neodymium magnets. Prolonged contact may cause an allergic reaction. We recommend use safety gloves.

Do not give to children

Always keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are very dangerous.

Serious injuries

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Cards and drives

Very strong magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Implant safety

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Powerful field

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

Security! Want to know more? Check our post: Are neodymium magnets dangerous?