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neodymium magnets

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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN: 5906301810292

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

4.12 kg / 40.39 N

Magnetic Induction

291.60 mT

Coating

[NiCuNi] Nickel

1.968 with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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MW 15x4 / N38 - cylindrical magnet

Specification / characteristics MW 15x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010030
GTIN 5906301810292
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 15 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 5.3 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.12 kg / 40.39 N
Magnetic Induction ~ ? 291.60 mT
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x4 / N38 - cylindrical magnet
properties values units
remenance Br [Min. - Max.] ? 12.2-12.6 kGs
remenance Br [Min. - Max.] ? 1220-1260 T
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 106 °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 magnet - technical parameters

The following information constitute the result of a engineering simulation. Results were calculated on models for the class NdFeB. Real-world performance might slightly differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 15x4 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2915 Gs
291.5 mT
4.12 kg / 4120.0 g
40.4 N
warning
1 mm 2620 Gs
262.0 mT
3.33 kg / 3327.5 g
32.6 N
warning
2 mm 2276 Gs
227.6 mT
2.51 kg / 2510.7 g
24.6 N
warning
5 mm 1324 Gs
132.4 mT
0.85 kg / 849.7 g
8.3 N
weak grip
10 mm 505 Gs
50.5 mT
0.12 kg / 123.7 g
1.2 N
weak grip
15 mm 222 Gs
22.2 mT
0.02 kg / 23.8 g
0.2 N
weak grip
20 mm 113 Gs
11.3 mT
0.01 kg / 6.1 g
0.1 N
weak grip
30 mm 40 Gs
4.0 mT
0.00 kg / 0.8 g
0.0 N
weak grip
50 mm 10 Gs
1.0 mT
0.00 kg / 0.0 g
0.0 N
weak grip
Table 2: Vertical assembly (shearing) - vertical pull
MW 15x4 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 1236.0 g
12.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.82 kg / 824.0 g
8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 412.0 g
4.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.06 kg / 2060.0 g
20.2 N
Table 3: Material efficiency (saturation) - power losses
MW 15x4 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.41 kg / 412.0 g
4.0 N
1 mm
25%
1.03 kg / 1030.0 g
10.1 N
2 mm
50%
2.06 kg / 2060.0 g
20.2 N
5 mm
100%
4.12 kg / 4120.0 g
40.4 N
10 mm
100%
4.12 kg / 4120.0 g
40.4 N
Table 4: Thermal stability (stability) - power drop
MW 15x4 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 4.12 kg / 4120.0 g
40.4 N
OK
40 °C -2.2% 4.03 kg / 4029.4 g
39.5 N
OK
60 °C -4.4% 3.94 kg / 3938.7 g
38.6 N
OK
80 °C -6.6% 3.85 kg / 3848.1 g
37.7 N
100 °C -28.8% 2.93 kg / 2933.4 g
28.8 N
Table 5: Magnet-Magnet interaction (repulsion) - field range
MW 15x4 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 6.18 kg / 6180.0 g
60.6 N
N/A
2 mm 3.76 kg / 3765.0 g
36.9 N
3.51 kg / 3514.0 g
34.5 N
5 mm 1.28 kg / 1275.0 g
12.5 N
1.19 kg / 1190.0 g
11.7 N
10 mm 0.18 kg / 180.0 g
1.8 N
0.17 kg / 168.0 g
1.6 N
20 mm 0.02 kg / 15.0 g
0.1 N
0.01 kg / 14.0 g
0.1 N
50 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
Table 6: Safety (HSE) (electronics) - precautionary measures
MW 15x4 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Table 7: Impact energy (kinetic energy) - warning
MW 15x4 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.64 km/h
(7.96 m/s)
0.17 J
30 mm 48.71 km/h
(13.53 m/s)
0.49 J
50 mm 62.88 km/h
(17.47 m/s)
0.81 J
100 mm 88.92 km/h
(24.70 m/s)
1.62 J
Table 8: Anti-corrosion coating durability
MW 15x4 / 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 9: Hydrostatics and buoyancy
MW 15x4 / N38
Environment Effective steel pull Effect
Air (land) 4.12 kg Standard
Water (riverbed) 4.72 kg
(+0.60 kg Buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

View more proposals

The offered product is a very strong cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø15x4 mm, guarantees maximum efficiency. The MW 15x4 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 4.12 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical 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 high power of 40.39 N with a weight of only 5.3 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø15x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 4 mm. The value of 40.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.3 g. The product has a [NiCuNi] coating, which secures it 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 15 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 and disadvantages of NdFeB magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

  • They do not lose magnetism, even over approximately 10 years – the reduction in strength is only ~1% (theoretically),
  • Magnets effectively resist against loss of magnetization caused by foreign field sources,
  • In other words, due to the shiny layer of nickel, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Considering the potential of flexible shaping and adaptation to specialized solutions, neodymium magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Universal use in future technologies – they are utilized in computer drives, motor assemblies, medical equipment, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

The load parameter shown concerns the maximum value, obtained under laboratory conditions, meaning:

  • on a plate made of structural steel, optimally conducting the magnetic flux
  • whose thickness is min. 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without coatings)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

It is worth knowing that the working load may be lower subject to elements below, in order of importance:

  • Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be lost to the other side.
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
  • Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Threat to navigation

An intense magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Beware of splinters

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Do not overheat magnets

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

Data carriers

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

ICD Warning

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

Caution required

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

Mechanical processing

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Hand protection

Big blocks can smash fingers instantly. Never place your hand between two strong magnets.

No play value

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.

Caution!

Looking for details? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98