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neodymium magnets

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MW 5x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010088

GTIN: 5906301810872

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

4.42 g

Magnetization Direction

↑ axial

Load capacity

0.45 kg / 4.40 N

Magnetic Induction

616.32 mT / 6163 Gs

Coating

[NiCuNi] Nickel

3.57 with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

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MW 5x30 / N38 - cylindrical magnet

Specification / characteristics MW 5x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010088
GTIN 5906301810872
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 5 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 4.42 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.45 kg / 4.40 N
Magnetic Induction ~ ? 616.32 mT / 6163 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x30 / 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

Physical modeling of the product - technical parameters

The following data constitute the result of a engineering calculation. Results are based on algorithms for the class NdFeB. Operational performance might slightly deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
MW 5x30 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 6154 Gs
615.4 mT
0.45 kg / 450.0 g
4.4 N
low risk
1 mm 3877 Gs
387.7 mT
0.18 kg / 178.6 g
1.8 N
low risk
2 mm 2308 Gs
230.8 mT
0.06 kg / 63.3 g
0.6 N
low risk
3 mm 1419 Gs
141.9 mT
0.02 kg / 23.9 g
0.2 N
low risk
5 mm 639 Gs
63.9 mT
0.00 kg / 4.8 g
0.0 N
low risk
10 mm 173 Gs
17.3 mT
0.00 kg / 0.4 g
0.0 N
low risk
15 mm 75 Gs
7.5 mT
0.00 kg / 0.1 g
0.0 N
low risk
20 mm 40 Gs
4.0 mT
0.00 kg / 0.0 g
0.0 N
low risk
30 mm 16 Gs
1.6 mT
0.00 kg / 0.0 g
0.0 N
low risk
50 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
low risk
Table 2: Slippage Capacity (Vertical Surface)
MW 5x30 / N38
Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.09 kg / 90.0 g
0.9 N
1 mm Stal (~0.2) 0.04 kg / 36.0 g
0.4 N
2 mm Stal (~0.2) 0.01 kg / 12.0 g
0.1 N
3 mm Stal (~0.2) 0.00 kg / 4.0 g
0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 5x30 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.14 kg / 135.0 g
1.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 90.0 g
0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 45.0 g
0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 225.0 g
2.2 N
Table 4: Steel thickness (saturation) - power losses
MW 5x30 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.05 kg / 45.0 g
0.4 N
1 mm
25%
0.11 kg / 112.5 g
1.1 N
2 mm
50%
0.23 kg / 225.0 g
2.2 N
5 mm
100%
0.45 kg / 450.0 g
4.4 N
10 mm
100%
0.45 kg / 450.0 g
4.4 N
Table 5: Thermal stability (stability) - resistance threshold
MW 5x30 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.45 kg / 450.0 g
4.4 N
OK
40 °C -2.2% 0.44 kg / 440.1 g
4.3 N
OK
60 °C -4.4% 0.43 kg / 430.2 g
4.2 N
OK
80 °C -6.6% 0.42 kg / 420.3 g
4.1 N
100 °C -28.8% 0.32 kg / 320.4 g
3.1 N
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 5x30 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 4.58 kg / 4584 g
45.0 N
6 170 Gs
N/A
1 mm 2.98 kg / 2982 g
29.3 N
9 927 Gs
2.68 kg / 2684 g
26.3 N
~0 Gs
2 mm 1.82 kg / 1820 g
17.9 N
7 755 Gs
1.64 kg / 1638 g
16.1 N
~0 Gs
3 mm 1.08 kg / 1083 g
10.6 N
5 981 Gs
0.97 kg / 974 g
9.6 N
~0 Gs
5 mm 0.39 kg / 391 g
3.8 N
3 595 Gs
0.35 kg / 352 g
3.5 N
~0 Gs
10 mm 0.05 kg / 49 g
0.5 N
1 278 Gs
0.04 kg / 44 g
0.4 N
~0 Gs
20 mm 0.00 kg / 4 g
0.0 N
346 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
49 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
Table 7: Protective zones (implants) - warnings
MW 5x30 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Table 8: Dynamics (kinetic energy) - collision effects
MW 5x30 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 10.18 km/h
(2.83 m/s)
0.02 J
30 mm 17.63 km/h
(4.90 m/s)
0.05 J
50 mm 22.75 km/h
(6.32 m/s)
0.09 J
100 mm 32.18 km/h
(8.94 m/s)
0.18 J
Table 9: Anti-corrosion coating durability
MW 5x30 / 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: Generator data (Pc)
MW 5x30 / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 1 468 Mx 14.7 µWb
Współczynnik Pc 1.59 Wysoki (Stabilny)
Table 11: Hydrostatics and buoyancy
MW 5x30 / N38
Environment Effective steel pull Effect
Air (land) 0.45 kg Standard
Water (riverbed) 0.52 kg
(+0.07 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. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

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The offered product is an incredibly powerful cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø5x30 mm, guarantees the highest energy density. The MW 5x30 / N38 model is characterized by a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.45 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 4.40 N with a weight of only 4.42 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
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 professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% 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 (Ø5x30), 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 Ø5x30 mm, which, at a weight of 4.42 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 0.45 kg (force ~4.40 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 30 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 through the diameter if your project requires it.

Advantages as well as disadvantages of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • A magnet with a smooth nickel surface has an effective appearance,
  • Magnetic induction on the working part of the magnet is very high,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Thanks to versatility in designing and the ability to adapt to complex applications,
  • Huge importance in modern technologies – they are used in data components, brushless drives, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Cons of neodymium magnets: weaknesses and usage proposals

  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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
  • We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting force for a neodymium magnet – what affects it?

The load parameter shown represents the peak performance, recorded under ideal test conditions, meaning:

  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • without any air gap between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of practical lifting force of a magnet

Please note that the magnet holding will differ influenced by the following factors, in order of importance:

  • Distance (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.

Advantages as well as disadvantages of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • A magnet with a smooth nickel surface has an effective appearance,
  • Magnetic induction on the working part of the magnet is very high,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Thanks to versatility in designing and the ability to adapt to complex applications,
  • Huge importance in modern technologies – they are used in data components, brushless drives, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Cons of neodymium magnets: weaknesses and usage proposals

  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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
  • We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting force for a neodymium magnet – what affects it?

The load parameter shown represents the peak performance, recorded under ideal test conditions, meaning:

  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • without any air gap between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of practical lifting force of a magnet

Please note that the magnet holding will differ influenced by the following factors, in order of importance:

  • Distance (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets

Protect data

Powerful magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Maximum temperature

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

No play value

Absolutely store magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are very dangerous.

Physical harm

Big blocks can crush fingers instantly. Never place your hand between two attracting surfaces.

Conscious usage

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

ICD Warning

People with a ICD should keep an large gap from magnets. The magnetism can interfere with the functioning of the implant.

Allergic reactions

Some people suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Frequent touching can result in an allergic reaction. We recommend wear safety gloves.

Magnets are brittle

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Compass and GPS

An intense magnetic field disrupts the operation of compasses in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

Fire risk

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Warning!

Looking for details? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98