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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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Detailed specifications 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

Physical analysis of the product - technical parameters

These information represent the direct effect of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x8 / N38

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

Table 2: Shear hold (vertical surface)
MW 8x8 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.41 kg / 406.0 g
4.0 N
1 mm Stal (~0.2) 0.23 kg / 230.0 g
2.3 N
2 mm Stal (~0.2) 0.12 kg / 118.0 g
1.2 N
3 mm Stal (~0.2) 0.06 kg / 58.0 g
0.6 N
5 mm Stal (~0.2) 0.02 kg / 16.0 g
0.2 N
10 mm Stal (~0.2) 0.00 kg / 2.0 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) - vertical pull
MW 8x8 / N38

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

Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x8 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.20 kg / 203.0 g
2.0 N
1 mm
25%
0.51 kg / 507.5 g
5.0 N
2 mm
50%
1.02 kg / 1015.0 g
10.0 N
5 mm
100%
2.03 kg / 2030.0 g
19.9 N
10 mm
100%
2.03 kg / 2030.0 g
19.9 N

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

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

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 8x8 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 9.48 kg / 9481 g
93.0 N
6 000 Gs
N/A
1 mm 7.26 kg / 7262 g
71.2 N
9 682 Gs
6.54 kg / 6536 g
64.1 N
~0 Gs
2 mm 5.37 kg / 5368 g
52.7 N
8 324 Gs
4.83 kg / 4831 g
47.4 N
~0 Gs
3 mm 3.88 kg / 3877 g
38.0 N
7 074 Gs
3.49 kg / 3489 g
34.2 N
~0 Gs
5 mm 1.95 kg / 1949 g
19.1 N
5 016 Gs
1.75 kg / 1754 g
17.2 N
~0 Gs
10 mm 0.36 kg / 364 g
3.6 N
2 169 Gs
0.33 kg / 328 g
3.2 N
~0 Gs
20 mm 0.03 kg / 27 g
0.3 N
592 Gs
0.02 kg / 24 g
0.2 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
66 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

Table 7: Safety (HSE) (implants) - 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
Mechanical watch 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: Collisions (cracking risk) - warning
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: Corrosion resistance
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Temperature resistance

*For standard magnets, 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
Material specification
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%
Ecology and recycling (GPSR)
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: 010106-2025
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other offers

This product is a very strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø8x8 mm, guarantees the highest energy density. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.03 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 19.92 N with a weight of only 3.02 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 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.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 available off-the-shelf 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 protects the surface 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 8 mm. Such an arrangement is standard 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.

Pros and cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
  • Magnetic induction on the working layer of the magnet turns out to be exceptional,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to the possibility of accurate forming and adaptation to unique solutions, magnetic components can be produced in a wide range of shapes and sizes, which increases their versatility,
  • Key role in modern industrial fields – they are utilized in HDD drives, motor assemblies, medical equipment, also other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in creating nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

Information about lifting capacity was defined for ideal contact conditions, including:
  • using a base made of high-permeability steel, acting as a magnetic yoke
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from several key aspects, listed from crucial:
  • Gap (between the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures 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 a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Medical implants

For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Product not for children

Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are tragic.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands and choose versions in plastic housing.

Combustion hazard

Dust created during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Do not overheat magnets

Keep cool. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Electronic hazard

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Crushing force

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Impact on smartphones

A powerful magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Maintain magnets close to a smartphone to prevent breaking the sensors.

Risk of cracking

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Immense force

Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often quicker than you can react.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98