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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

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1.353 ZŁ with VAT / pcs + price for transport

1.100 ZŁ net + 23% VAT / pcs

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Technical details - 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 simulation of the product - report

The following data represent the result of a physical analysis. Results rely on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
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 pounds
950.0 g / 9.3 N
 safe
1 mm 975 Gs
97.5 mT
 0.87 kg / 1.92 pounds
869.2 g / 8.5 N
 safe
2 mm 902 Gs
90.2 mT
 0.74 kg / 1.64 pounds
744.7 g / 7.3 N
 safe
3 mm 812 Gs
81.2 mT
 0.60 kg / 1.33 pounds
603.4 g / 5.9 N
 safe
5 mm 619 Gs
61.9 mT
 0.35 kg / 0.77 pounds
350.6 g / 3.4 N
 safe
10 mm 274 Gs
27.4 mT
 0.07 kg / 0.15 pounds
68.7 g / 0.7 N
 safe
15 mm 126 Gs
12.6 mT
 0.01 kg / 0.03 pounds
14.6 g / 0.1 N
 safe
20 mm 65 Gs
6.5 mT
 0.00 kg / 0.01 pounds
3.9 g / 0.0 N
 safe
30 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 safe
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Pulling power decreases significantly per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, veneer) strongly diminishes the holding power. Magnetic products hold most effectively at the point of direct contact; distance nullifies the power. See how rapidly the pull force plummet, when the product does not adhere tightly to the metal substrate. When calculating the assembly, eliminate redundant distances.

Table 2: Vertical load (vertical surface)
MW 18x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.42 pounds
190.0 g / 1.9 N
1 mm Stal (~0.2) 0.17 kg / 0.38 pounds
174.0 g / 1.7 N
2 mm Stal (~0.2) 0.15 kg / 0.33 pounds
148.0 g / 1.5 N
3 mm Stal (~0.2) 0.12 kg / 0.26 pounds
120.0 g / 1.2 N
5 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section calculates the estimated holding capacity required to cause the slippage of the magnet down against a vertical metal surface (assuming standard friction). This value is a function of the gap size 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 pounds
285.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.42 pounds
190.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 pounds
95.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.48 kg / 1.05 pounds
475.0 g / 4.7 N
When placing a element on a upright plane (e.g., a fridge), it will only hold barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Want to create a wall mount? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a significantly smaller cargo. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 18x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.21 pounds
95.0 g / 0.9 N
1 mm
25%
 0.24 kg / 0.52 pounds
237.5 g / 2.3 N
2 mm
50%
 0.48 kg / 1.05 pounds
475.0 g / 4.7 N
3 mm
75%
 0.71 kg / 1.57 pounds
712.5 g / 7.0 N
5 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
10 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
11 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
12 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
A thin sheet cannot conduct the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To achieve 100% of this magnet's potential, you require a sufficiently solid element of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - 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 pounds
950.0 g / 9.3 N
 OK
40 °C -2.2% 0.93 kg / 2.05 pounds
929.1 g / 9.1 N
 OK
60 °C -4.4% 0.91 kg / 2.00 pounds
908.2 g / 8.9 N
80 °C -6.6% 0.89 kg / 1.96 pounds
887.3 g / 8.7 N
100 °C -28.8% 0.68 kg / 1.49 pounds
676.4 g / 6.6 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the magnet's power briefly lowers. Avoid using this magnet close to ovens exceeding its working range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.63 kg / 3.59 pounds
1 960 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
 N/A
1 mm 1.57 kg / 3.47 pounds
2 002 Gs
0.24 kg / 0.52 pounds
236 g / 2.3 N
 1.41 kg / 3.12 pounds
~0 Gs
2 mm 1.49 kg / 3.29 pounds
1 949 Gs
0.22 kg / 0.49 pounds
224 g / 2.2 N
 1.34 kg / 2.96 pounds
~0 Gs
3 mm 1.39 kg / 3.06 pounds
1 883 Gs
0.21 kg / 0.46 pounds
209 g / 2.0 N
 1.25 kg / 2.76 pounds
~0 Gs
5 mm 1.16 kg / 2.55 pounds
1 717 Gs
0.17 kg / 0.38 pounds
174 g / 1.7 N
 1.04 kg / 2.30 pounds
~0 Gs
10 mm 0.60 kg / 1.33 pounds
1 238 Gs
0.09 kg / 0.20 pounds
90 g / 0.9 N
 0.54 kg / 1.19 pounds
~0 Gs
20 mm 0.12 kg / 0.26 pounds
548 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
74 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
46 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
15 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Important: Results refer to shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (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
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 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
Powerful magnet radiation poses a real danger to IT equipment and medical implants. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - 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
NdFeB products are very brittle – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Coating parameters (durability)
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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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 emitted by the pole surface. Key data for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For N38 material, the critical 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
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%
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: 010037-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
Input data in one of the inputs, and the remaining units convert in real-time.

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The presented product is an extremely powerful rod magnet, produced from durable NdFeB material, which, at dimensions of Ø18x1.5 mm, guarantees optimal power. The MW 18x1.5 / N38 model boasts high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.95 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, where field concentration 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 every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling 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 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 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.

Strengths as well as weaknesses of rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately 10 years it drops only by ~1% (according to research),
  • They are resistant to demagnetization induced by external magnetic fields,
  • Thanks to the metallic finish, the plating of nickel, gold, or silver gives an clean appearance,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in constructing and the capacity to customize to individual projects,
  • Key role in innovative solutions – they serve a role in hard drives, electric motors, advanced medical instruments, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

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.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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, in case of application outdoors
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The specified lifting capacity represents the peak performance, measured under ideal test conditions, specifically:
  • using a base made of high-permeability steel, acting as a circuit closing element
  • whose transverse dimension is min. 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (metal-to-metal)
  • under axial force vector (90-degree angle)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Effective lifting capacity impacted by specific conditions, mainly (from most important):
  • Air gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

Warnings
Shattering risk

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Serious injuries

Risk of injury: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Combustion hazard

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Keep away from electronics

A strong magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid damaging the sensors.

Keep away from computers

Do not bring magnets near a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.

No play value

NdFeB magnets are not intended for children. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates urgent medical intervention.

Handling rules

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

Thermal limits

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

ICD Warning

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

Caution! Details about risks in the article: Safety of working with magnets.