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MW 4x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010079

GTIN/EAN: 5906301810780

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

0.75 g

Magnetization Direction

↑ axial

Load capacity

0.35 kg / 3.48 N

Magnetic Induction

599.59 mT / 5996 Gs

Coating

[NiCuNi] Nickel

view parameters »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Lifting power and appearance of a neodymium magnet can be analyzed using our magnetic mass calculator.

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Physical properties - MW 4x8 / N38 - cylindrical magnet

Specification / characteristics - MW 4x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010079
GTIN/EAN 5906301810780
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 4 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 0.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.35 kg / 3.48 N
Magnetic Induction ~ ? 599.59 mT / 5996 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x8 / 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 assembly - data

These values are the result of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MW 4x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5984 Gs
598.4 mT
 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
 safe
1 mm 3280 Gs
328.0 mT
 0.11 kg / 0.23 pounds
105.1 g / 1.0 N
 safe
2 mm 1696 Gs
169.6 mT
 0.03 kg / 0.06 pounds
28.1 g / 0.3 N
 safe
3 mm 941 Gs
94.1 mT
 0.01 kg / 0.02 pounds
8.7 g / 0.1 N
 safe
5 mm 371 Gs
37.1 mT
 0.00 kg / 0.00 pounds
1.3 g / 0.0 N
 safe
10 mm 82 Gs
8.2 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
15 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force decreases significantly with every mm of spacing. Remember that even the smallest gap (e.g., dirt, paint, dust) strongly reduces the pull force. Neodymiums work strongest in perfect adhesion; gap drastically cuts the power. Analyze how rapidly the load capacity fall, when the product does not touch directly to the metal substrate. When calculating the mounting, avoid redundant distances.

Table 2: Vertical hold (wall)
MW 4x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below shows the estimated holding capacity sufficient to initiate the sliding of the magnet downwards along a vertical steel plate (considering standard friction). The holding force depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 4x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.11 kg / 0.23 pounds
105.0 g / 1.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.15 pounds
70.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.08 pounds
35.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.39 pounds
175.0 g / 1.7 N
When placing a element on a vertical plane (e.g., a board), it will only hold just approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that holders move down easier than they pull off. Designing a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will slide down under a significantly smaller load. Using a rubber coating can significantly raise the stability.

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.03 kg / 0.08 pounds
35.0 g / 0.3 N
1 mm
25%
 0.09 kg / 0.19 pounds
87.5 g / 0.9 N
2 mm
50%
 0.18 kg / 0.39 pounds
175.0 g / 1.7 N
3 mm
75%
 0.26 kg / 0.58 pounds
262.5 g / 2.6 N
5 mm
100%
 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
10 mm
100%
 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
11 mm
100%
 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
12 mm
100%
 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
A thin sheet is incapable of conduct the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's potential, you need a suitably thick piece of steel. The saturation effect causes that on thin elements (e.g., car bodies), the product works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 4x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.35 kg / 0.77 pounds
350.0 g / 3.4 N
 OK
40 °C -2.2% 0.34 kg / 0.75 pounds
342.3 g / 3.4 N
 OK
60 °C -4.4% 0.33 kg / 0.74 pounds
334.6 g / 3.3 N
 OK
80 °C -6.6% 0.33 kg / 0.72 pounds
326.9 g / 3.2 N
100 °C -28.8% 0.25 kg / 0.55 pounds
249.2 g / 2.4 N
Ordinary NdFeB products lose power above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. With every degree above norm, the neodymium's power briefly drops. Do not use this product close to heaters higher than its working range. Ignoring the limit will lead to destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 4x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.77 kg / 6.12 pounds
6 121 Gs
0.42 kg / 0.92 pounds
416 g / 4.1 N
 N/A
1 mm 1.59 kg / 3.51 pounds
9 063 Gs
0.24 kg / 0.53 pounds
239 g / 2.3 N
 1.43 kg / 3.16 pounds
~0 Gs
2 mm 0.83 kg / 1.84 pounds
6 559 Gs
0.12 kg / 0.28 pounds
125 g / 1.2 N
 0.75 kg / 1.65 pounds
~0 Gs
3 mm 0.43 kg / 0.94 pounds
4 694 Gs
0.06 kg / 0.14 pounds
64 g / 0.6 N
 0.38 kg / 0.85 pounds
~0 Gs
5 mm 0.12 kg / 0.27 pounds
2 498 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
10 mm 0.01 kg / 0.02 pounds
743 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
165 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
17 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
10 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
7 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of operation. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Figures demonstrate sliding force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MW 4x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Timepiece 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field is a real danger to IT equipment as well as pacemakers. These NdFeB products generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 4x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.79 km/h
(6.05 m/s)
 0.01 J
30 mm 37.74 km/h
(10.48 m/s)
 0.04 J
50 mm 48.72 km/h
(13.53 m/s)
 0.07 J
100 mm 68.89 km/h
(19.14 m/s)
 0.14 J
Magnetic elements are very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Corrosion resistance
MW 4x8 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 4x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 836 Mx 8.4 µWb
Pc Coefficient 1.21 High (Stable)
Flux value passing through the pole surface. Key data when building generators as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 4x8 / N38

Environment Effective steel pull Effect
Air (land) 0.35 kg Standard
Water (riverbed) 0.40 kg
(+0.05 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!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.21

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 specification and ecology
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: 010079-2026
Measurement Calculator
Pulling force
Field Strength
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The presented product is an exceptionally strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø4x8 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.35 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid 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.
This model is perfect for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 3.48 N with a weight of only 0.75 g, this rod is indispensable in electronics and wherever every gram matters.
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., 4.1 mm) using two-component epoxy glues. To ensure long-term durability 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 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 (Ø4x8), 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 4 mm and height 8 mm. The value of 3.48 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.75 g. 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 8 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.

Pros and cons of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around ten years it drops only by ~1% (according to research),
  • Neodymium magnets remain extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • In other words, due to the shiny layer of gold, the element is aesthetically pleasing,
  • Magnets have huge magnetic induction on the working surface,
  • 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...
  • Possibility of precise shaping and adjusting to precise conditions,
  • Fundamental importance in electronics industry – they find application in hard drives, electric motors, diagnostic systems, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 secure oxidation and corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The force parameter is a theoretical maximum value conducted under the following configuration:
  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • without the slightest clearance between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

During everyday use, the real power is determined by many variables, ranked from crucial:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Stainless steels may attract less.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate decreases the load capacity.

H&S for magnets
Handling rules

Use magnets with awareness. Their huge power can shock even experienced users. Be vigilant and respect their power.

Do not drill into magnets

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Cards and drives

Do not bring magnets close to a wallet, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.

Phone sensors

Note: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your mobile, device, and GPS.

Danger to pacemakers

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Magnets are brittle

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them shattering into small pieces.

Adults only

These products are not intended for children. Swallowing several magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Heat warning

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Hand protection

Large magnets can break fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Nickel coating and allergies

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, cease handling magnets and use protective gear.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?