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neodymium magnets

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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN: 5906301811138

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

3.01 kg / 29.53 N

Magnetic Induction

607.01 mT

Coating

[NiCuNi] Nickel

4.60 with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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MW 8x20 / N38 - cylindrical magnet

Specification / characteristics MW 8x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010475
GTIN 5906301811138
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 8 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 7.54 g
Magnetization Direction → diametrical
Load capacity ~ ? 3.01 kg / 29.53 N
Magnetic Induction ~ ? 607.01 mT
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / 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 analysis of the magnet - report

The following values constitute the result of a mathematical calculation. Results are based on algorithms for the class NdFeB. Real-world performance might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - power drop
MW 8x20 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 6064 Gs
606.4 mT
3.01 kg / 3010.0 g
29.5 N
strong
1 mm 4587 Gs
458.7 mT
1.72 kg / 1722.0 g
16.9 N
safe
2 mm 3327 Gs
332.7 mT
0.91 kg / 906.1 g
8.9 N
safe
5 mm 1281 Gs
128.1 mT
0.13 kg / 134.3 g
1.3 N
safe
10 mm 389 Gs
38.9 mT
0.01 kg / 12.4 g
0.1 N
safe
15 mm 169 Gs
16.9 mT
0.00 kg / 2.3 g
0.0 N
safe
20 mm 90 Gs
9.0 mT
0.00 kg / 0.7 g
0.0 N
safe
30 mm 35 Gs
3.5 mT
0.00 kg / 0.1 g
0.0 N
safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.0 g
0.0 N
safe
Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x20 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.90 kg / 903.0 g
8.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.60 kg / 602.0 g
5.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.30 kg / 301.0 g
3.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.51 kg / 1505.0 g
14.8 N
Table 3: Material efficiency (substrate influence) - power losses
MW 8x20 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.30 kg / 301.0 g
3.0 N
1 mm
25%
0.75 kg / 752.5 g
7.4 N
2 mm
50%
1.51 kg / 1505.0 g
14.8 N
5 mm
100%
3.01 kg / 3010.0 g
29.5 N
10 mm
100%
3.01 kg / 3010.0 g
29.5 N
Table 4: Thermal resistance (material behavior) - power drop
MW 8x20 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 3.01 kg / 3010.0 g
29.5 N
OK
40 °C -2.2% 2.94 kg / 2943.8 g
28.9 N
OK
60 °C -4.4% 2.88 kg / 2877.6 g
28.2 N
OK
80 °C -6.6% 2.81 kg / 2811.3 g
27.6 N
100 °C -28.8% 2.14 kg / 2143.1 g
21.0 N
Table 5: Magnet-Magnet interaction (repulsion) - forces in the system
MW 8x20 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 4.52 kg / 4515.0 g
44.3 N
N/A
2 mm 1.37 kg / 1365.0 g
13.4 N
1.27 kg / 1274.0 g
12.5 N
5 mm 0.20 kg / 195.0 g
1.9 N
0.18 kg / 182.0 g
1.8 N
10 mm 0.02 kg / 15.0 g
0.1 N
0.01 kg / 14.0 g
0.1 N
20 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 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) - warnings
MW 8x20 / 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
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Table 7: Impact energy (kinetic energy) - warning
MW 8x20 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.20 km/h
(5.61 m/s)
0.12 J
30 mm 34.90 km/h
(9.69 m/s)
0.35 J
50 mm 45.06 km/h
(12.52 m/s)
0.59 J
100 mm 63.72 km/h
(17.70 m/s)
1.18 J
Table 8: Corrosion resistance
MW 8x20 / 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: Underwater work (magnet fishing)
MW 8x20 / N38
Environment Effective steel pull Effect
Air (land) 3.01 kg Standard
Water (riverbed) 3.45 kg
(+0.44 kg Buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Other proposals

This product is an extremely powerful rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø8x20 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 3.01 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 29.53 N with a weight of only 7.54 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x20), 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 8 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 3.01 kg (force ~29.53 N), which, with such defined dimensions, proves the high power of the NdFeB material. 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 8 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 through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Apart from their notable power, neodymium magnets have these key benefits:

  • Their strength is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the reflective surface of gold, the element is aesthetically pleasing,
  • Magnetic induction on the top side of the magnet turns out to be extremely intense,
  • 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 freedom in shaping and the ability to adapt to specific needs,
  • Huge importance in innovative solutions – they serve a role in magnetic memories, brushless drives, diagnostic systems, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Disadvantages of NdFeB magnets:

  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. 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 force. Often, when the temperature exceeds 80°C, their strength 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing threads in the magnet and complex forms - preferred is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical after entering 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

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The declared magnet strength refers to the limit force, measured under optimal environment, meaning:

  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with an ideally smooth contact surface
  • with zero gap (no coatings)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by specific conditions, such as (from most important):

  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Phone sensors

Note: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Finger safety

Large magnets can smash fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Material brittleness

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them shattering into shards.

Magnetic media

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Do not underestimate power

Use magnets consciously. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their force.

Combustion hazard

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Medical interference

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Product not for children

These products are not intended for children. Eating a few magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.

Heat sensitivity

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Allergy Warning

Certain individuals suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Extended handling can result in skin redness. It is best to wear safety gloves.

Warning!

Want to know more? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98