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MW 8x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010103

GTIN/EAN: 5906301811022

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.13 g

Magnetization Direction

↑ axial

Load capacity

1.70 kg / 16.67 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

0.701 with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical specification - MW 8x3 / N38 - cylindrical magnet

Specification / characteristics - MW 8x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010103
GTIN/EAN 5906301811022
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 3 mm [±0,1 mm]
Weight 1.13 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.70 kg / 16.67 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x3 / 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 simulation of the product - technical parameters

The following data are the outcome of a engineering analysis. Values are based on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
MW 8x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3712 Gs
371.2 mT
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
weak grip
1 mm 2880 Gs
288.0 mT
1.02 kg / 2.26 lbs
1023.3 g / 10.0 N
weak grip
2 mm 2069 Gs
206.9 mT
0.53 kg / 1.16 lbs
527.9 g / 5.2 N
weak grip
3 mm 1439 Gs
143.9 mT
0.26 kg / 0.56 lbs
255.3 g / 2.5 N
weak grip
5 mm 704 Gs
70.4 mT
0.06 kg / 0.13 lbs
61.1 g / 0.6 N
weak grip
10 mm 169 Gs
16.9 mT
0.00 kg / 0.01 lbs
3.5 g / 0.0 N
weak grip
15 mm 62 Gs
6.2 mT
0.00 kg / 0.00 lbs
0.5 g / 0.0 N
weak grip
20 mm 29 Gs
2.9 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
weak grip
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Slippage load (wall)
MW 8x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.34 kg / 0.75 lbs
340.0 g / 3.3 N
1 mm Stal (~0.2) 0.20 kg / 0.45 lbs
204.0 g / 2.0 N
2 mm Stal (~0.2) 0.11 kg / 0.23 lbs
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.05 kg / 0.11 lbs
52.0 g / 0.5 N
5 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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 (shearing) - behavior on slippery surfaces
MW 8x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.51 kg / 1.12 lbs
510.0 g / 5.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.85 kg / 1.87 lbs
850.0 g / 8.3 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
1 mm
25%
0.43 kg / 0.94 lbs
425.0 g / 4.2 N
2 mm
50%
0.85 kg / 1.87 lbs
850.0 g / 8.3 N
3 mm
75%
1.28 kg / 2.81 lbs
1275.0 g / 12.5 N
5 mm
100%
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
10 mm
100%
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
11 mm
100%
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
12 mm
100%
1.70 kg / 3.75 lbs
1700.0 g / 16.7 N

Table 5: Thermal stability (stability) - thermal limit
MW 8x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.70 kg / 3.75 lbs
1700.0 g / 16.7 N
OK
40 °C -2.2% 1.66 kg / 3.67 lbs
1662.6 g / 16.3 N
OK
60 °C -4.4% 1.63 kg / 3.58 lbs
1625.2 g / 15.9 N
80 °C -6.6% 1.59 kg / 3.50 lbs
1587.8 g / 15.6 N
100 °C -28.8% 1.21 kg / 2.67 lbs
1210.4 g / 11.9 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.27 kg / 9.42 lbs
5 146 Gs
0.64 kg / 1.41 lbs
641 g / 6.3 N
N/A
1 mm 3.40 kg / 7.50 lbs
6 627 Gs
0.51 kg / 1.13 lbs
510 g / 5.0 N
3.06 kg / 6.75 lbs
~0 Gs
2 mm 2.57 kg / 5.67 lbs
5 761 Gs
0.39 kg / 0.85 lbs
386 g / 3.8 N
2.31 kg / 5.10 lbs
~0 Gs
3 mm 1.87 kg / 4.12 lbs
4 914 Gs
0.28 kg / 0.62 lbs
281 g / 2.8 N
1.68 kg / 3.71 lbs
~0 Gs
5 mm 0.93 kg / 2.04 lbs
3 456 Gs
0.14 kg / 0.31 lbs
139 g / 1.4 N
0.83 kg / 1.84 lbs
~0 Gs
10 mm 0.15 kg / 0.34 lbs
1 408 Gs
0.02 kg / 0.05 lbs
23 g / 0.2 N
0.14 kg / 0.30 lbs
~0 Gs
20 mm 0.01 kg / 0.02 lbs
339 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
31 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
19 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
12 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
8 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
6 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
4 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (electronics) - warnings
MW 8x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 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 8x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.17 km/h
(10.88 m/s)
0.07 J
30 mm 67.75 km/h
(18.82 m/s)
0.20 J
50 mm 87.47 km/h
(24.30 m/s)
0.33 J
100 mm 123.70 km/h
(34.36 m/s)
0.67 J

Table 9: Corrosion resistance
MW 8x3 / 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 (Flux)
MW 8x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 946 Mx 19.5 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 8x3 / N38

Environment Effective steel pull Effect
Air (land) 1.70 kg Standard
Water (riverbed) 1.95 kg
(+0.25 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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%
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: 010103-2026
Quick Unit Converter
Force (pull)

Field Strength

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The presented product is an extremely powerful cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø8x3 mm, guarantees maximum efficiency. The MW 8x3 / N38 component boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 1.70 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 16.67 N with a weight of only 1.13 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method 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, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x3), 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 3 mm. The key parameter here is the holding force amounting to approximately 1.70 kg (force ~16.67 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 cylinder is magnetized axially (along the height of 3 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by external disturbances,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the ability of flexible molding and customization to specialized needs, magnetic components can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Universal use in modern technologies – they are utilized in hard drives, electric motors, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. 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
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Highest magnetic holding forcewhat it depends on?

The declared magnet strength represents the peak performance, measured under ideal test conditions, meaning:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness minimum 10 mm
  • with an ideally smooth touching surface
  • without any insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Real force is influenced by working environment parameters, such as (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Phone sensors

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Mechanical processing

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Caution required

Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their force.

Data carriers

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Permanent damage

Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Physical harm

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Medical implants

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Material brittleness

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Metal Allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Do not give to children

These products are not intended for children. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Caution! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98