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MW 20x18 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010040

GTIN/EAN: 5906301810391

Load capacity 13.19 kg / 129.35 N Magnetic Induction 541.64 mT / 5416 Gs
Diameter Ø
20 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
42.41 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
view technical data »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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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

Technical modeling of the assembly - data

The following values constitute the outcome of a physical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance may differ. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
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 pounds
13190.0 g / 129.4 N
 crushing
1 mm 4870 Gs
487.0 mT
 10.67 kg / 23.52 pounds
10669.5 g / 104.7 N
 crushing
2 mm 4330 Gs
433.0 mT
 8.43 kg / 18.59 pounds
8434.2 g / 82.7 N
 medium risk
3 mm 3816 Gs
381.6 mT
 6.55 kg / 14.45 pounds
6552.7 g / 64.3 N
 medium risk
5 mm 2913 Gs
291.3 mT
 3.82 kg / 8.42 pounds
3818.4 g / 37.5 N
 medium risk
10 mm 1455 Gs
145.5 mT
 0.95 kg / 2.10 pounds
952.2 g / 9.3 N
 weak grip
15 mm 775 Gs
77.5 mT
 0.27 kg / 0.60 pounds
270.1 g / 2.7 N
 weak grip
20 mm 450 Gs
45.0 mT
 0.09 kg / 0.20 pounds
91.3 g / 0.9 N
 weak grip
30 mm 188 Gs
18.8 mT
 0.02 kg / 0.04 pounds
15.9 g / 0.2 N
 weak grip
50 mm 54 Gs
5.4 mT
 0.00 kg / 0.00 pounds
1.3 g / 0.0 N
 weak grip
Pulling power decreases significantly with every mm of gap. Note that every additional insulation layer (e.g., dirt, paint, veneer) significantly reduces the pull force. Neodymiums hold optimally at the point of direct contact; gap kills the force. Observe how quickly the parameters drop, when the product does not adhere directly to the steel surface. When planning the mounting, discard redundant distances.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.64 kg / 5.82 pounds
2638.0 g / 25.9 N
1 mm Stal (~0.2) 2.13 kg / 4.70 pounds
2134.0 g / 20.9 N
2 mm Stal (~0.2) 1.69 kg / 3.72 pounds
1686.0 g / 16.5 N
3 mm Stal (~0.2) 1.31 kg / 2.89 pounds
1310.0 g / 12.9 N
5 mm Stal (~0.2) 0.76 kg / 1.68 pounds
764.0 g / 7.5 N
10 mm Stal (~0.2) 0.19 kg / 0.42 pounds
190.0 g / 1.9 N
15 mm Stal (~0.2) 0.05 kg / 0.12 pounds
54.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below defines the theoretical weight limit required to cause the downward movement of the magnet down against a vertical steel plate (considering standard friction coefficient). The holding force depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 pounds
3957.0 g / 38.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.64 kg / 5.82 pounds
2638.0 g / 25.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.32 kg / 2.91 pounds
1319.0 g / 12.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.60 kg / 14.54 pounds
6595.0 g / 64.7 N
When mounting a magnet on a vertical wall (e.g., a car body), it will maintain just about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip mean that magnets slide down faster than they detach. Designing a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Steel thickness (saturation) - 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 pounds
659.5 g / 6.5 N
1 mm
13%
 1.65 kg / 3.63 pounds
1648.8 g / 16.2 N
2 mm
25%
 3.30 kg / 7.27 pounds
3297.5 g / 32.3 N
3 mm
38%
 4.95 kg / 10.90 pounds
4946.3 g / 48.5 N
5 mm
63%
 8.24 kg / 18.17 pounds
8243.8 g / 80.9 N
10 mm
100%
 13.19 kg / 29.08 pounds
13190.0 g / 129.4 N
11 mm
100%
 13.19 kg / 29.08 pounds
13190.0 g / 129.4 N
12 mm
100%
 13.19 kg / 29.08 pounds
13190.0 g / 129.4 N
A thin sheet is not enough to take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you need a suitably thick piece of steel. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the holder works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MW 20x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 13.19 kg / 29.08 pounds
13190.0 g / 129.4 N
 OK
40 °C -2.2% 12.90 kg / 28.44 pounds
12899.8 g / 126.5 N
 OK
60 °C -4.4% 12.61 kg / 27.80 pounds
12609.6 g / 123.7 N
 OK
80 °C -6.6% 12.32 kg / 27.16 pounds
12319.5 g / 120.9 N
100 °C -28.8% 9.39 kg / 20.70 pounds
9391.3 g / 92.1 N
Standard neodymium magnets lose strength above the temperature limit. Avoid high temperatures – heat can irreversibly demagnetize this product. With every degree above norm, the magnet's power temporarily lowers. Do not use this magnet close to heaters higher than its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 20x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 56.78 kg / 125.17 pounds
5 968 Gs
8.52 kg / 18.78 pounds
8516 g / 83.5 N
 N/A
1 mm 51.26 kg / 113.01 pounds
10 289 Gs
7.69 kg / 16.95 pounds
7689 g / 75.4 N
 46.13 kg / 101.71 pounds
~0 Gs
2 mm 45.93 kg / 101.25 pounds
9 739 Gs
6.89 kg / 15.19 pounds
6889 g / 67.6 N
 41.33 kg / 91.13 pounds
~0 Gs
3 mm 40.93 kg / 90.24 pounds
9 194 Gs
6.14 kg / 13.54 pounds
6140 g / 60.2 N
 36.84 kg / 81.22 pounds
~0 Gs
5 mm 32.06 kg / 70.68 pounds
8 137 Gs
4.81 kg / 10.60 pounds
4809 g / 47.2 N
 28.86 kg / 63.62 pounds
~0 Gs
10 mm 16.44 kg / 36.24 pounds
5 826 Gs
2.47 kg / 5.44 pounds
2465 g / 24.2 N
 14.79 kg / 32.61 pounds
~0 Gs
20 mm 4.10 kg / 9.04 pounds
2 909 Gs
0.61 kg / 1.36 pounds
615 g / 6.0 N
 3.69 kg / 8.13 pounds
~0 Gs
50 mm 0.15 kg / 0.34 pounds
565 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
 0.14 kg / 0.31 pounds
~0 Gs
60 mm 0.07 kg / 0.15 pounds
376 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
70 mm 0.03 kg / 0.07 pounds
262 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.07 pounds
~0 Gs
80 mm 0.02 kg / 0.04 pounds
190 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
142 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.01 kg / 0.01 pounds
109 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of action. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the impact force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Results apply to friction force of two identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - 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
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
A strong magnetic field poses a serious hazard to IT equipment and medical implants. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 20x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.20 km/h
(4.78 m/s)
 0.48 J
30 mm 17.87 km/h
(4.96 m/s)
 0.52 J
50 mm 17.89 km/h
(4.97 m/s)
 0.52 J
100 mm 17.89 km/h
(4.97 m/s)
 0.52 J
Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Anti-corrosion coating 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 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 20x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 374 Mx 173.7 µWb
Pc Coefficient 0.85 High (Stable)
Total magnetic flux passing through the magnet pole. Key data in coil applications and motors. Pc value defines 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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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 surface, the magnet holds only a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*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

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.

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%

Environmental data

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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This product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø20x18 mm, guarantees maximum efficiency. The MW 20x18 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 13.19 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 129.35 N with a weight of only 42.41 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, 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 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 in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 18 mm. The value of 129.35 N means that the magnet is capable of holding a weight many times exceeding its own mass of 42.41 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 and cons of rare earth magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately ten years it drops only by ~1% (theoretically),
  • They do not lose their magnetic properties even under external field action,
  • In other words, due to the glossy surface of silver, the element gains visual value,
  • Neodymium magnets create maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual shaping and adjusting to atypical conditions,
  • Fundamental importance in modern industrial fields – they find application in HDD drives, electric motors, medical equipment, as well as other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets lose 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
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The load parameter shown represents the peak performance, obtained under optimal environment, meaning:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by smoothness
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Key elements affecting lifting force

In practice, the actual lifting capacity is determined by a number of factors, ranked from crucial:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Caution required

Use magnets consciously. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Dust is flammable

Dust created during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Allergic reactions

Certain individuals have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to dermatitis. We strongly advise use protective gloves.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Shattering risk

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

This is not a toy

NdFeB magnets are not intended for children. Eating a few magnets may result in them attracting across intestines, which poses a critical condition and necessitates urgent medical intervention.

Electronic hazard

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Crushing force

Big blocks can crush fingers instantly. Do not place your hand between two attracting surfaces.

GPS Danger

Note: neodymium magnets produce a field that confuses precision electronics. Keep a separation from your phone, tablet, and navigation systems.

Important! More info about hazards in the article: Safety of working with magnets.