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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

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1.574 ZŁ with VAT / pcs + price for transport

1.280 ZŁ net + 23% VAT / pcs

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Technical details - 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

Engineering modeling of the magnet - report

The following information are the direct effect of a mathematical simulation. Results are based on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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
 weak grip
1 mm 887 Gs
88.7 mT
 0.90 kg / 1.99 LBS
902.2 g / 8.9 N
 weak grip
2 mm 832 Gs
83.2 mT
 0.79 kg / 1.75 LBS
794.6 g / 7.8 N
 weak grip
3 mm 763 Gs
76.3 mT
 0.67 kg / 1.47 LBS
667.4 g / 6.5 N
 weak grip
5 mm 606 Gs
60.6 mT
 0.42 kg / 0.93 LBS
421.6 g / 4.1 N
 weak grip
10 mm 294 Gs
29.4 mT
 0.10 kg / 0.22 LBS
99.5 g / 1.0 N
 weak grip
15 mm 144 Gs
14.4 mT
 0.02 kg / 0.05 LBS
23.6 g / 0.2 N
 weak grip
20 mm 76 Gs
7.6 mT
 0.01 kg / 0.01 LBS
6.7 g / 0.1 N
 weak grip
30 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 weak grip
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) strongly weakens the grip. Magnets operate strongest in perfect adhesion; air break drastically cuts the force. Analyze how rapidly the parameters plummet, when the magnet does not adhere flatly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Shear hold (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 table below calculates the approximate force needed to cause the downward movement of the magnet downwards on a vertical steel plate (assuming standard friction). The holding force is relative to the gap size 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 element on a upright plane (e.g., a car body), it will maintain only approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that products move down faster than they detach. Planning a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a noticeably lighter weight. Using a rubber coating can effectively increase the grip.

Table 4: Material efficiency (saturation) - 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 thin sheet cannot conduct the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you require a sufficiently solid backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - power drop
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
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – heat can permanently demagnetize this product. With increasing heat, the magnet's capacity temporarily lowers. Refrain from using this magnet in hot environments exceeding its safe range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

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 attract each other from a wider radius than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still significant.
*Field value between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Note: Results refer to sliding force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - 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
Car key 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
Extremely neodym field poses a serious hazard to electronics as well as pacemakers. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, 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
Neodymium magnets are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to fingers. Be sure to control the product during mounting 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 handling with powerful specimens.

Table 9: Surface protection spec
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
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. Key data in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the safety limit 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.

Engineering data and GPSR
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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The offered product is an exceptionally strong cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø20x1.5 mm, guarantees maximum efficiency. The MW 20x1.5 / N38 component features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.97 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, 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 rod is indispensable in miniature devices 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 professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø20x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
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 lifting capacity amounting to approximately 0.97 kg (force ~9.50 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it 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. 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 diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

Advantages

Apart from their superior holding force, neodymium magnets have these key benefits:
  • Their power is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • Neodymium magnets remain exceptionally resistant to loss of magnetic properties caused by external field sources,
  • A magnet with a metallic gold surface looks better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to freedom in forming and the ability to adapt to unusual requirements,
  • Wide application in modern industrial fields – they find application in data components, brushless drives, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, 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 power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Holding force of 0.97 kg is a measurement result conducted under the following configuration:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Holding efficiency impacted by working environment parameters, mainly (from priority):
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Threat to electronics

Do not bring magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Conscious usage

Be careful. Rare earth magnets act from a distance and connect with huge force, often quicker than you can move away.

Machining danger

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Implant safety

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Warning for allergy sufferers

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

Permanent damage

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

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Choking Hazard

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

Crushing force

Big blocks can break fingers instantly. Never put your hand between two strong magnets.

Keep away from electronics

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?