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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

check technical specifications »

1.353 ZŁ with VAT / pcs + price for transport

1.100 ZŁ net + 23% VAT / pcs

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Technical - 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

Technical analysis of the assembly - data

The following values are the outcome of a physical analysis. Values rely on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
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
Magnetic force weakens drastically with every subsequent millimeter of spacing. Note that even a very thin break (e.g., contamination, paint, veneer) significantly reduces the pull force. Neodymiums work optimally at the point of direct contact; distance weakens the force. Notice how flashily the parameters plummet, when the magnet does not adhere tightly to the steel surface. When planning the mounting, eliminate additional spacers.

Table 2: Sliding 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
This section shows the approximate holding capacity needed to start the downward movement of the magnet downwards against a vertical steel wall (assuming typical friction coefficient). This value varies with the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 hanging a element on a vertical surface (e.g., a fridge), it will only hold barely approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that products slip faster than they pull off. Designing a vertical fastening? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will give way down under a much lighter cargo. Using a rubber pad can significantly increase the grip.

Table 4: Steel thickness (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 is unable to take in the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you require a sufficiently solid piece of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the product holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (stability) - power drop
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 change their properties power after exceeding the maximum temperature. Avoid high temperatures – heat can permanently demagnetize this product. With every degree above norm, the neodymium's power briefly drops. Refrain from using this product near heat sources exceeding its working range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 18x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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 magnetic products attract each other from a much further distance than a neodymium and metal combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of performance. 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 collision energy is massive. The repulsion force is slightly lower than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Estimates refer to sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
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
Mechanical watch 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
Extremely neodym field is a real danger to electronic devices as well as pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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 collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can cause material chips or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 emitted by the magnet pole. Key data when building generators and motors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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: 010037-2026
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This product is an extremely powerful cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø18x1.5 mm, guarantees maximum efficiency. The MW 18x1.5 / N38 component is characterized by 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. 0.95 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its 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 sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 9.34 N with a weight of only 2.86 g, this cylindrical magnet 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 long-term durability in automation, specialized industrial adhesives 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 a great economic balance and operational stability. 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 available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 18 mm and height 1.5 mm. 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.
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 18 mm. 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.

Advantages as well as disadvantages of neodymium magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during nearly 10 years – the drop in strength is only ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • Thanks to the metallic finish, the layer of nickel, gold-plated, or silver gives an clean appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to versatility in constructing and the capacity to customize to unusual requirements,
  • Significant place in electronics industry – they are commonly used in mass storage devices, electric motors, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength 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 - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power was defined for the most favorable conditions, assuming:
  • using a sheet made of high-permeability steel, acting as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an polished contact surface
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be escaped to the other side.
  • Plate material – mild steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Permanent damage

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Crushing risk

Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Dust explosion hazard

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Compass and GPS

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Data carriers

Equipment safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Allergic reactions

Certain individuals experience a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to dermatitis. We recommend wear safety gloves.

Magnets are brittle

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Life threat

Individuals with a ICD must keep an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Adults only

Product intended for adults. Tiny parts pose a choking risk, causing severe trauma. Keep away from children and animals.

Do not underestimate power

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

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