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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

1.353 with VAT / pcs + price for transport

1.100 ZŁ net + 23% VAT / pcs

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Detailed specification - 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 simulation of the assembly - report

These data are the result of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Please consider these calculations as a supplementary guide for designers.

Table 1: Static 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
low risk
1 mm 975 Gs
97.5 mT
0.87 kg / 1.92 pounds
869.2 g / 8.5 N
low risk
2 mm 902 Gs
90.2 mT
0.74 kg / 1.64 pounds
744.7 g / 7.3 N
low risk
3 mm 812 Gs
81.2 mT
0.60 kg / 1.33 pounds
603.4 g / 5.9 N
low risk
5 mm 619 Gs
61.9 mT
0.35 kg / 0.77 pounds
350.6 g / 3.4 N
low risk
10 mm 274 Gs
27.4 mT
0.07 kg / 0.15 pounds
68.7 g / 0.7 N
low risk
15 mm 126 Gs
12.6 mT
0.01 kg / 0.03 pounds
14.6 g / 0.1 N
low risk
20 mm 65 Gs
6.5 mT
0.00 kg / 0.01 pounds
3.9 g / 0.0 N
low risk
30 mm 23 Gs
2.3 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
low risk
50 mm 6 Gs
0.6 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Vertical force (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

Table 3: Wall mounting (shearing) - 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 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

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 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

Table 5: Working in heat (material behavior) - resistance threshold
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

Table 6: Two magnets (attraction) - field range
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 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

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
Phone / Smartphone 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

Table 8: Impact energy (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

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)

Table 10: Electrical 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)

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

*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

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%
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
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Check out also offers

The presented product is an incredibly powerful cylinder magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø18x1.5 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it a perfect 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. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard 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 cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 18.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for 90% 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 (Ø18x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø18x1.5 mm, which, at a weight of 2.86 g, makes it an element with high 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 cylinder 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. 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 diametrically if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They retain magnetic properties for nearly ten years – the loss is just ~1% (in theory),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • By using a lustrous layer of silver, the element gains an proper look,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact modeling and adapting to concrete conditions,
  • Wide application in modern industrial fields – they find application in mass storage devices, electric motors, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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, when using outdoors
  • Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products can complicate diagnosis medical when they are in the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat affects it?

Breakaway force was determined for ideal contact conditions, assuming:
  • with the application of a yoke made of special test steel, ensuring full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • with a surface free of scratches
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ subject to the following factors, in order of importance:
  • Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal factor – 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, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Maximum temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Shattering risk

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Magnetic media

Powerful magnetic fields can destroy records on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

Magnetic interference

Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Do not drill into magnets

Dust produced during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Crushing force

Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Handling rules

Use magnets consciously. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

Product not for children

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Store away from kids and pets.

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop working with magnets and use protective gear.

Medical interference

Individuals with a ICD have to maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98