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MW 18x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010037

GTIN/EAN: 5906301810360

5.00

Diameter Ø

18 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

2.86 g

Magnetization Direction

↑ axial

Load capacity

0.95 kg / 9.34 N

Magnetic Induction

101.91 mT / 1019 Gs

Coating

[NiCuNi] Nickel

view properties »

1.353 ZŁ with VAT / pcs + price for transport

1.100 ZŁ net + 23% VAT / pcs

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Technical data - MW 18x1.5 / N38 - cylindrical magnet

Specification / characteristics - MW 18x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010037
GTIN/EAN 5906301810360
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 18 mm [±0,1 mm]
Height 1.5 mm [±0,1 mm]
Weight 2.86 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.95 kg / 9.34 N
Magnetic Induction ~ ? 101.91 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 18x1.5 / 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 product - technical parameters

The following values are the result of a physical simulation. Values are based on algorithms for the class Nd2Fe14B. Actual performance may differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MW 18x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1019 Gs
101.9 mT
 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
 low risk
1 mm 975 Gs
97.5 mT
 0.87 kg / 1.92 LBS
869.2 g / 8.5 N
 low risk
2 mm 902 Gs
90.2 mT
 0.74 kg / 1.64 LBS
744.7 g / 7.3 N
 low risk
3 mm 812 Gs
81.2 mT
 0.60 kg / 1.33 LBS
603.4 g / 5.9 N
 low risk
5 mm 619 Gs
61.9 mT
 0.35 kg / 0.77 LBS
350.6 g / 3.4 N
 low risk
10 mm 274 Gs
27.4 mT
 0.07 kg / 0.15 LBS
68.7 g / 0.7 N
 low risk
15 mm 126 Gs
12.6 mT
 0.01 kg / 0.03 LBS
14.6 g / 0.1 N
 low risk
20 mm 65 Gs
6.5 mT
 0.00 kg / 0.01 LBS
3.9 g / 0.0 N
 low risk
30 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 low risk
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Pulling power decreases drastically with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnets work most effectively in perfect adhesion; distance drastically cuts the force. Analyze how quickly the load capacity drop, when the product does not touch flatly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Vertical capacity (wall)
MW 18x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.42 LBS
190.0 g / 1.9 N
1 mm Stal (~0.2) 0.17 kg / 0.38 LBS
174.0 g / 1.7 N
2 mm Stal (~0.2) 0.15 kg / 0.33 LBS
148.0 g / 1.5 N
3 mm Stal (~0.2) 0.12 kg / 0.26 LBS
120.0 g / 1.2 N
5 mm Stal (~0.2) 0.07 kg / 0.15 LBS
70.0 g / 0.7 N
10 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 indicates the approximate holding capacity necessary to initiate the downward movement of the magnet downwards against a upright steel plate (assuming typical friction coefficient). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 18x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.29 kg / 0.63 LBS
285.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.42 LBS
190.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 LBS
95.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.48 kg / 1.05 LBS
475.0 g / 4.7 N
When mounting a holder on a vertical surface (e.g., a board), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient cause that holders move down easier than they pop off the substrate. Planning a wall mount? Note that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a noticeably lighter cargo. Using a rubber layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 18x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.21 LBS
95.0 g / 0.9 N
1 mm
25%
 0.24 kg / 0.52 LBS
237.5 g / 2.3 N
2 mm
50%
 0.48 kg / 1.05 LBS
475.0 g / 4.7 N
3 mm
75%
 0.71 kg / 1.57 LBS
712.5 g / 7.0 N
5 mm
100%
 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
10 mm
100%
 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
11 mm
100%
 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
12 mm
100%
 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
A thin metal plate cannot take in the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's potential, you need a suitably thick backing of metal. The saturation effect causes that on delicate walls (e.g., thin profiles), the product works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MW 18x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.95 kg / 2.09 LBS
950.0 g / 9.3 N
 OK
40 °C -2.2% 0.93 kg / 2.05 LBS
929.1 g / 9.1 N
 OK
60 °C -4.4% 0.91 kg / 2.00 LBS
908.2 g / 8.9 N
80 °C -6.6% 0.89 kg / 1.96 LBS
887.3 g / 8.7 N
100 °C -28.8% 0.68 kg / 1.49 LBS
676.4 g / 6.6 N
Standard neodymium magnets irreversibly lose strength after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly destroy this magnet. With every degree above norm, the magnet's capacity momentarily decreases. Avoid using this magnet in hot environments higher than its working range. Ignoring the limit will lead to permanent loss of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 18x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.63 kg / 3.59 LBS
1 960 Gs
0.24 kg / 0.54 LBS
244 g / 2.4 N
 N/A
1 mm 1.57 kg / 3.47 LBS
2 002 Gs
0.24 kg / 0.52 LBS
236 g / 2.3 N
 1.41 kg / 3.12 LBS
~0 Gs
2 mm 1.49 kg / 3.29 LBS
1 949 Gs
0.22 kg / 0.49 LBS
224 g / 2.2 N
 1.34 kg / 2.96 LBS
~0 Gs
3 mm 1.39 kg / 3.06 LBS
1 883 Gs
0.21 kg / 0.46 LBS
209 g / 2.0 N
 1.25 kg / 2.76 LBS
~0 Gs
5 mm 1.16 kg / 2.55 LBS
1 717 Gs
0.17 kg / 0.38 LBS
174 g / 1.7 N
 1.04 kg / 2.30 LBS
~0 Gs
10 mm 0.60 kg / 1.33 LBS
1 238 Gs
0.09 kg / 0.20 LBS
90 g / 0.9 N
 0.54 kg / 1.19 LBS
~0 Gs
20 mm 0.12 kg / 0.26 LBS
548 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.23 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
74 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
46 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
30 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
21 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
15 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
11 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 much further distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is a bit weaker than the attraction, but still large.
*Field value between like poles reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Attention: Results refer to shear force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MW 18x1.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 2.5 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
A strong magnetic field is a real danger to IT equipment as well as medical implants. These NdFeB products produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 18x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.19 km/h
(5.33 m/s)
 0.04 J
30 mm 31.85 km/h
(8.85 m/s)
 0.11 J
50 mm 41.10 km/h
(11.42 m/s)
 0.19 J
100 mm 58.12 km/h
(16.15 m/s)
 0.37 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Surface protection spec
MW 18x1.5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 18x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 519 Mx 35.2 µWb
Pc Coefficient 0.13 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MW 18x1.5 / N38

Environment Effective steel pull Effect
Air (land) 0.95 kg Standard
Water (riverbed) 1.09 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!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Heat tolerance

*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) = 0.13

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
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: 010037-2026
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Magnet pull force
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This product is an incredibly powerful cylinder magnet, made from durable NdFeB material, which, with dimensions of Ø18x1.5 mm, guarantees optimal power. This specific item features an accuracy of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.95 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 9.34 N with a weight of only 2.86 g, this rod is indispensable in electronics and wherever low weight is crucial.
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 precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø18x1.5), 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 Ø18x1.5 mm, which, at a weight of 2.86 g, makes it an element with impressive magnetic energy density. The value of 9.34 N means that the magnet is capable of holding a weight many times exceeding its own mass of 2.86 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet 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 standard 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain full power for almost ten years – the drop is just ~1% (according to analyses),
  • They possess excellent resistance to magnetism drop due to opposing magnetic fields,
  • Thanks to the elegant finish, the plating of nickel, gold-plated, or silver gives an aesthetic appearance,
  • Magnetic induction on the top side of the magnet turns out to be extremely intense,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to freedom in designing and the capacity to adapt to complex applications,
  • Fundamental importance in future technologies – they are commonly used in HDD drives, electric drive systems, precision medical tools, and other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • 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.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, including:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth touching surface
  • with zero gap (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the actual holding force results from a number of factors, listed from most significant:
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Mechanical processing

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Implant safety

Individuals with a pacemaker have to maintain an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Material brittleness

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them breaking into small pieces.

Immense force

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Crushing risk

Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Allergy Warning

A percentage of the population have a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.

Safe distance

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

This is not a toy

NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Operating temperature

Keep cool. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

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