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MW 8x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010106

GTIN/EAN: 5906301811053

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

3.02 g

Magnetization Direction

↑ axial

Load capacity

2.03 kg / 19.92 N

Magnetic Induction

553.67 mT / 5537 Gs

Coating

[NiCuNi] Nickel

1.341 with VAT / pcs + price for transport

1.090 ZŁ net + 23% VAT / pcs

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Technical details - MW 8x8 / N38 - cylindrical magnet

Specification / characteristics - MW 8x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010106
GTIN/EAN 5906301811053
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 8 mm [±0,1 mm]
Weight 3.02 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.03 kg / 19.92 N
Magnetic Induction ~ ? 553.67 mT / 5537 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x8 / 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 modeling of the product - data

These data are the result of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
MW 8x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5531 Gs
553.1 mT
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
medium risk
1 mm 4162 Gs
416.2 mT
1.15 kg / 2.53 lbs
1149.3 g / 11.3 N
safe
2 mm 2984 Gs
298.4 mT
0.59 kg / 1.30 lbs
590.7 g / 5.8 N
safe
3 mm 2107 Gs
210.7 mT
0.29 kg / 0.65 lbs
294.5 g / 2.9 N
safe
5 mm 1084 Gs
108.4 mT
0.08 kg / 0.17 lbs
78.0 g / 0.8 N
safe
10 mm 296 Gs
29.6 mT
0.01 kg / 0.01 lbs
5.8 g / 0.1 N
safe
15 mm 118 Gs
11.8 mT
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
safe
20 mm 58 Gs
5.8 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
safe
30 mm 20 Gs
2.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Sliding force (wall)
MW 8x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.41 kg / 0.90 lbs
406.0 g / 4.0 N
1 mm Stal (~0.2) 0.23 kg / 0.51 lbs
230.0 g / 2.3 N
2 mm Stal (~0.2) 0.12 kg / 0.26 lbs
118.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
5 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 8x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.61 kg / 1.34 lbs
609.0 g / 6.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N

Table 4: Steel thickness (substrate influence) - power losses
MW 8x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
1 mm
25%
0.51 kg / 1.12 lbs
507.5 g / 5.0 N
2 mm
50%
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N
3 mm
75%
1.52 kg / 3.36 lbs
1522.5 g / 14.9 N
5 mm
100%
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
10 mm
100%
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
11 mm
100%
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
12 mm
100%
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N

Table 5: Thermal resistance (stability) - resistance threshold
MW 8x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
OK
40 °C -2.2% 1.99 kg / 4.38 lbs
1985.3 g / 19.5 N
OK
60 °C -4.4% 1.94 kg / 4.28 lbs
1940.7 g / 19.0 N
OK
80 °C -6.6% 1.90 kg / 4.18 lbs
1896.0 g / 18.6 N
100 °C -28.8% 1.45 kg / 3.19 lbs
1445.4 g / 14.2 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 8x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.48 kg / 20.90 lbs
6 000 Gs
1.42 kg / 3.14 lbs
1422 g / 14.0 N
N/A
1 mm 7.26 kg / 16.01 lbs
9 682 Gs
1.09 kg / 2.40 lbs
1089 g / 10.7 N
6.54 kg / 14.41 lbs
~0 Gs
2 mm 5.37 kg / 11.83 lbs
8 324 Gs
0.81 kg / 1.78 lbs
805 g / 7.9 N
4.83 kg / 10.65 lbs
~0 Gs
3 mm 3.88 kg / 8.55 lbs
7 074 Gs
0.58 kg / 1.28 lbs
582 g / 5.7 N
3.49 kg / 7.69 lbs
~0 Gs
5 mm 1.95 kg / 4.30 lbs
5 016 Gs
0.29 kg / 0.64 lbs
292 g / 2.9 N
1.75 kg / 3.87 lbs
~0 Gs
10 mm 0.36 kg / 0.80 lbs
2 169 Gs
0.05 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.72 lbs
~0 Gs
20 mm 0.03 kg / 0.06 lbs
592 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
0.02 kg / 0.05 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
66 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
41 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
27 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
19 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
14 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
10 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MW 8x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 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: Dynamics (cracking risk) - collision effects
MW 8x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.19 km/h
(7.28 m/s)
0.08 J
30 mm 45.29 km/h
(12.58 m/s)
0.24 J
50 mm 58.47 km/h
(16.24 m/s)
0.40 J
100 mm 82.68 km/h
(22.97 m/s)
0.80 J

Table 9: Anti-corrosion coating durability
MW 8x8 / 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: Construction data (Pc)
MW 8x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 868 Mx 28.7 µWb
Pc Coefficient 0.89 High (Stable)

Table 11: Physics of underwater searching
MW 8x8 / N38

Environment Effective steel pull Effect
Air (land) 2.03 kg Standard
Water (riverbed) 2.32 kg
(+0.29 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. Shear force

*Caution: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Temperature resistance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89

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 and environmental data
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: 010106-2026
Quick Unit Converter
Force (pull)

Magnetic Induction

Check out more products

The offered product is a very strong cylinder magnet, made from advanced NdFeB material, which, with dimensions of Ø8x8 mm, guarantees maximum efficiency. This specific item boasts an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 2.03 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical 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 positioning or actuating element. Thanks to the pull force of 19.92 N with a weight of only 3.02 g, this rod is indispensable in electronics 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., 8.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 8 mm. The value of 19.92 N means that the magnet is capable of holding a weight many times exceeding its own mass of 3.02 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 8 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a smooth gold surface is more attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Due to the option of flexible forming and adaptation to individualized requirements, neodymium magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
  • Versatile presence in advanced technology sectors – they are commonly used in HDD drives, motor assemblies, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complicated shapes in magnets, we recommend using cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Magnet power was defined for ideal contact conditions, assuming:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ground touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

It is worth knowing that the magnet holding will differ depending on the following factors, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Warnings
Operating temperature

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Magnet fragility

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets leads to them breaking into shards.

Magnetic interference

A powerful magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid breaking the sensors.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Safe distance

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

Physical harm

Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Warning for heart patients

For implant holders: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Choking Hazard

NdFeB magnets are not toys. Eating a few magnets can lead to them attracting across intestines, which constitutes a direct threat to life and requires urgent medical intervention.

Sensitization to coating

Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Fire risk

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Caution! Details about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98