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MW 20x18 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010040

GTIN/EAN: 5906301810391

Diameter Ø

20 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

42.41 g

Magnetization Direction

↑ axial

Load capacity

13.19 kg / 129.35 N

Magnetic Induction

541.64 mT / 5416 Gs

Coating

[NiCuNi] Nickel

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23.54 ZŁ with VAT / pcs + price for transport

19.14 ZŁ net + 23% VAT / pcs

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Detailed specification - MW 20x18 / N38 - cylindrical magnet

Specification / characteristics - MW 20x18 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010040
GTIN/EAN 5906301810391
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 18 mm [±0,1 mm]
Weight 42.41 g
Magnetization Direction ↑ axial
Load capacity ~ ? 13.19 kg / 129.35 N
Magnetic Induction ~ ? 541.64 mT / 5416 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x18 / 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 product - report

Presented information are the result of a physical analysis. Results were calculated on models for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - power drop
MW 20x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5414 Gs
541.4 mT
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
 dangerous!
1 mm 4870 Gs
487.0 mT
 10.67 kg / 23.52 LBS
10669.5 g / 104.7 N
 dangerous!
2 mm 4330 Gs
433.0 mT
 8.43 kg / 18.59 LBS
8434.2 g / 82.7 N
 medium risk
3 mm 3816 Gs
381.6 mT
 6.55 kg / 14.45 LBS
6552.7 g / 64.3 N
 medium risk
5 mm 2913 Gs
291.3 mT
 3.82 kg / 8.42 LBS
3818.4 g / 37.5 N
 medium risk
10 mm 1455 Gs
145.5 mT
 0.95 kg / 2.10 LBS
952.2 g / 9.3 N
 low risk
15 mm 775 Gs
77.5 mT
 0.27 kg / 0.60 LBS
270.1 g / 2.7 N
 low risk
20 mm 450 Gs
45.0 mT
 0.09 kg / 0.20 LBS
91.3 g / 0.9 N
 low risk
30 mm 188 Gs
18.8 mT
 0.02 kg / 0.04 LBS
15.9 g / 0.2 N
 low risk
50 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 LBS
1.3 g / 0.0 N
 low risk
Grip strength decreases sharply per each millimeter of distance. Remember that even the smallest gap (e.g., contamination, paint, rust) noticeably reduces the pull force. Neodymiums work most effectively at the point of direct contact; gap nullifies the force. Observe how rapidly the pull force plummet, when the magnet does not adhere directly to the metal substrate. When calculating the assembly, discard unnecessary gaps.

Table 2: Slippage force (wall)
MW 20x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.64 kg / 5.82 LBS
2638.0 g / 25.9 N
1 mm Stal (~0.2) 2.13 kg / 4.70 LBS
2134.0 g / 20.9 N
2 mm Stal (~0.2) 1.69 kg / 3.72 LBS
1686.0 g / 16.5 N
3 mm Stal (~0.2) 1.31 kg / 2.89 LBS
1310.0 g / 12.9 N
5 mm Stal (~0.2) 0.76 kg / 1.68 LBS
764.0 g / 7.5 N
10 mm Stal (~0.2) 0.19 kg / 0.42 LBS
190.0 g / 1.9 N
15 mm Stal (~0.2) 0.05 kg / 0.12 LBS
54.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section indicates the approximate force necessary to cause the downward movement of the magnet down on a vertical metal surface (assuming standard friction coefficient). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.96 kg / 8.72 LBS
3957.0 g / 38.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.64 kg / 5.82 LBS
2638.0 g / 25.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.32 kg / 2.91 LBS
1319.0 g / 12.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.60 kg / 14.54 LBS
6595.0 g / 64.7 N
When hanging a element on a vertical plane (e.g., a car body), it will maintain only approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient mean that products slide down faster than they detach. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will give way down under a significantly smaller cargo. Using a rubber pad can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MW 20x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.66 kg / 1.45 LBS
659.5 g / 6.5 N
1 mm
13%
 1.65 kg / 3.63 LBS
1648.8 g / 16.2 N
2 mm
25%
 3.30 kg / 7.27 LBS
3297.5 g / 32.3 N
3 mm
38%
 4.95 kg / 10.90 LBS
4946.3 g / 48.5 N
5 mm
63%
 8.24 kg / 18.17 LBS
8243.8 g / 80.9 N
10 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
11 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
12 mm
100%
 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
A thin metal plate cannot conduct the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MW 20x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 13.19 kg / 29.08 LBS
13190.0 g / 129.4 N
 OK
40 °C -2.2% 12.90 kg / 28.44 LBS
12899.8 g / 126.5 N
 OK
60 °C -4.4% 12.61 kg / 27.80 LBS
12609.6 g / 123.7 N
 OK
80 °C -6.6% 12.32 kg / 27.16 LBS
12319.5 g / 120.9 N
100 °C -28.8% 9.39 kg / 20.70 LBS
9391.3 g / 92.1 N
Classic neodymiums irreversibly lose power past the thermal threshold. Watch out for overheating – heat can permanently damage this magnet. With every degree above norm, the magnet's capacity temporarily lowers. Avoid using this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 20x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 56.78 kg / 125.17 LBS
5 968 Gs
8.52 kg / 18.78 LBS
8516 g / 83.5 N
 N/A
1 mm 51.26 kg / 113.01 LBS
10 289 Gs
7.69 kg / 16.95 LBS
7689 g / 75.4 N
 46.13 kg / 101.71 LBS
~0 Gs
2 mm 45.93 kg / 101.25 LBS
9 739 Gs
6.89 kg / 15.19 LBS
6889 g / 67.6 N
 41.33 kg / 91.13 LBS
~0 Gs
3 mm 40.93 kg / 90.24 LBS
9 194 Gs
6.14 kg / 13.54 LBS
6140 g / 60.2 N
 36.84 kg / 81.22 LBS
~0 Gs
5 mm 32.06 kg / 70.68 LBS
8 137 Gs
4.81 kg / 10.60 LBS
4809 g / 47.2 N
 28.86 kg / 63.62 LBS
~0 Gs
10 mm 16.44 kg / 36.24 LBS
5 826 Gs
2.47 kg / 5.44 LBS
2465 g / 24.2 N
 14.79 kg / 32.61 LBS
~0 Gs
20 mm 4.10 kg / 9.04 LBS
2 909 Gs
0.61 kg / 1.36 LBS
615 g / 6.0 N
 3.69 kg / 8.13 LBS
~0 Gs
50 mm 0.15 kg / 0.34 LBS
565 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
 0.14 kg / 0.31 LBS
~0 Gs
60 mm 0.07 kg / 0.15 LBS
376 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
70 mm 0.03 kg / 0.07 LBS
262 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.07 LBS
~0 Gs
80 mm 0.02 kg / 0.04 LBS
190 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
90 mm 0.01 kg / 0.02 LBS
142 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.01 kg / 0.01 LBS
109 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a wider radius of operation. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is huge. The repulsion force is slightly lower than the attraction, but still large.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Calculations apply to shear force of dual same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 20x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field is a serious hazard to electronics as well as medical implants. These magnets generate a flux that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants 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 (cracking risk) - warning
MW 20x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.57 km/h
(5.16 m/s)
 0.56 J
30 mm 30.83 km/h
(8.56 m/s)
 1.56 J
50 mm 39.77 km/h
(11.05 m/s)
 2.59 J
100 mm 56.24 km/h
(15.62 m/s)
 5.18 J
Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MW 20x18 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 20x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 374 Mx 173.7 µWb
Pc Coefficient 0.85 High (Stable)
Flux value emitted by the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MW 20x18 / N38

Environment Effective steel pull Effect
Air (land) 13.19 kg Standard
Water (riverbed) 15.10 kg
(+1.91 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 only a fraction of its nominal pull.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.85

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
Material specification
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: 010040-2026
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The presented product is a very strong cylindrical magnet, produced from advanced NdFeB material, which, at dimensions of Ø20x18 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 13.19 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 129.35 N with a weight of only 42.41 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
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 do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets 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 (Ø20x18), 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 Ø20x18 mm, which, at a weight of 42.41 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 13.19 kg (force ~129.35 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.
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. 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 rare earth magnets.

Strengths

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They retain attractive force for almost 10 years – the drop is just ~1% (in theory),
  • They show high resistance to demagnetization induced by external field influence,
  • Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise machining and adjusting to complex needs,
  • Fundamental importance in electronics industry – they are utilized in hard drives, electromotive mechanisms, medical equipment, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum magnetic pulling force – what affects it?

The declared magnet strength represents the maximum value, obtained under laboratory conditions, specifically:
  • using a sheet made of mild steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • under axial force direction (90-degree angle)
  • at temperature room level

Impact of factors on magnetic holding capacity in practice

Please note that the working load will differ influenced by elements below, starting with the most relevant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Magnets are brittle

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Nickel coating and allergies

Studies show that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands and choose encased magnets.

Adults only

These products are not intended for children. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Bone fractures

Protect your hands. Two large magnets will join instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Threat to navigation

Navigation devices and mobile phones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Permanent damage

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Keep away from computers

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Medical interference

People with a ICD should keep an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Caution required

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Flammability

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

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