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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

technical specifications »

23.54 ZŁ with VAT / pcs + price for transport

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Technical - 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 analysis of the assembly - data

Presented information represent the outcome of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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
 critical level
1 mm 4870 Gs
487.0 mT
 10.67 kg / 23.52 LBS
10669.5 g / 104.7 N
 critical level
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
 safe
15 mm 775 Gs
77.5 mT
 0.27 kg / 0.60 LBS
270.1 g / 2.7 N
 safe
20 mm 450 Gs
45.0 mT
 0.09 kg / 0.20 LBS
91.3 g / 0.9 N
 safe
30 mm 188 Gs
18.8 mT
 0.02 kg / 0.04 LBS
15.9 g / 0.2 N
 safe
50 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 LBS
1.3 g / 0.0 N
 safe
Grip strength weakens significantly with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) significantly diminishes the holding power. Neodymiums hold most effectively at the point of direct contact; distance kills the power. Analyze how rapidly the parameters drop, when the product does not adhere directly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Sliding capacity (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
The table below presents the theoretical force necessary to initiate the sliding of the magnet vertically on a upright steel plate (assuming standard friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 upright plane (e.g., a car body), it will only hold just approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that products slip faster than they pop off the substrate. Planning a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a significantly smaller weight. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 focus the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you need a suitably thick backing of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the product holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (stability) - 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 lose parameters after exceeding the maximum temperature. Protect against heat – heat can permanently damage this magnet. With every degree above norm, the magnet's power temporarily drops. Avoid using this product in hot environments exceeding its working range. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
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 wider radius than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a larger range of operation. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still significant.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Calculations demonstrate friction force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
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
Timepiece 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Car key 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
Powerful magnet radiation poses a real danger to electronics as well as medical implants. These magnets produce a field that disrupts operation of sensitive medical devices. Notice: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
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
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit violently 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: Surface protection spec
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 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: Construction data (Pc)
MW 20x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 374 Mx 173.7 µWb
Pc Coefficient 0.85 High (Stable)
Flux value passing through the pole surface. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%
Warning: 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. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Steel saturation

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Temperature resistance

*For N38 material, the safety limit is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%
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: 010040-2026
Quick Unit Converter
Pulling force
Field Strength
Type a number in one of the inputs, and the rest change on the fly.

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The offered product is a very strong cylinder magnet, made from advanced NdFeB material, which, with dimensions of Ø20x18 mm, guarantees optimal power. The MW 20x18 / N38 component features a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 13.19 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, 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 cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest 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 warehouse.
This model is characterized by dimensions Ø20x18 mm, which, at a weight of 42.41 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 13.19 kg (force ~129.35 N), which, with such defined dimensions, proves the high power of the NdFeB material. 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. 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 as well as cons of neodymium magnets.

Strengths

Apart from their superior power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They do not lose their magnetic properties even under external field action,
  • Thanks to the shimmering finish, the coating of nickel, gold-plated, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise forming as well as optimizing to precise requirements,
  • Wide application in advanced technology sectors – they are commonly used in computer drives, drive modules, medical devices, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce 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 forms - preferred is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

The load parameter shown concerns the maximum value, recorded under optimal environment, specifically:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • with an ground contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by working environment parameters, including (from priority):
  • Distance (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Alloy steels reduce magnetic properties and holding force.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Bodily injuries

Large magnets can crush fingers instantly. Never put your hand betwixt two strong magnets.

This is not a toy

NdFeB magnets are not intended for children. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them shattering into shards.

Protect data

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Life threat

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Operating temperature

Do not overheat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Sensitization to coating

Some people suffer from a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause skin redness. We strongly advise wear safety gloves.

Caution required

Handle magnets consciously. Their immense force can surprise even experienced users. Stay alert and do not underestimate their power.

Flammability

Dust generated during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Threat to navigation

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

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