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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

see technical data »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical specification - 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 - technical parameters

The following information are the outcome of a mathematical calculation. Results were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
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 lbs
350.0 g / 3.4 N
 weak grip
1 mm 3280 Gs
328.0 mT
 0.11 kg / 0.23 lbs
105.1 g / 1.0 N
 weak grip
2 mm 1696 Gs
169.6 mT
 0.03 kg / 0.06 lbs
28.1 g / 0.3 N
 weak grip
3 mm 941 Gs
94.1 mT
 0.01 kg / 0.02 lbs
8.7 g / 0.1 N
 weak grip
5 mm 371 Gs
37.1 mT
 0.00 kg / 0.00 lbs
1.3 g / 0.0 N
 weak grip
10 mm 82 Gs
8.2 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
15 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength weakens sharply with every mm of distance. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Neodymiums work most effectively at the point of direct contact; air break nullifies the force. Notice how rapidly the load capacity fall, when the product does not touch flatly to the metal substrate. When designing the mounting, eliminate unnecessary gaps.

Table 2: Vertical force (vertical surface)
MW 4x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.15 lbs
70.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 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
This section calculates the approximate force required to start the sliding of the magnet vertically on a upright steel plate (considering typical friction coefficient). The holding force is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
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 lbs
105.0 g / 1.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.15 lbs
70.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.08 lbs
35.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.39 lbs
175.0 g / 1.7 N
When mounting a holder on a vertical plane (e.g., a fridge), it will maintain only approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that magnets slip faster than they pull off. Designing a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a significantly smaller weight. Utilizing a rubberized coating can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - 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 lbs
35.0 g / 0.3 N
1 mm
25%
 0.09 kg / 0.19 lbs
87.5 g / 0.9 N
2 mm
50%
 0.18 kg / 0.39 lbs
175.0 g / 1.7 N
3 mm
75%
 0.26 kg / 0.58 lbs
262.5 g / 2.6 N
5 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
10 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
11 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
12 mm
100%
 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
A thin metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel dimension according to the table below.

Table 5: Working in heat (stability) - power drop
MW 4x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
 OK
40 °C -2.2% 0.34 kg / 0.75 lbs
342.3 g / 3.4 N
 OK
60 °C -4.4% 0.33 kg / 0.74 lbs
334.6 g / 3.3 N
 OK
80 °C -6.6% 0.33 kg / 0.72 lbs
326.9 g / 3.2 N
100 °C -28.8% 0.25 kg / 0.55 lbs
249.2 g / 2.4 N
Ordinary NdFeB products irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can irreversibly damage this magnet. With every degree above norm, the magnet's force temporarily drops. Avoid using this magnet near heat sources exceeding its working range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 4x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.77 kg / 6.12 lbs
6 121 Gs
0.42 kg / 0.92 lbs
416 g / 4.1 N
 N/A
1 mm 1.59 kg / 3.51 lbs
9 063 Gs
0.24 kg / 0.53 lbs
239 g / 2.3 N
 1.43 kg / 3.16 lbs
~0 Gs
2 mm 0.83 kg / 1.84 lbs
6 559 Gs
0.12 kg / 0.28 lbs
125 g / 1.2 N
 0.75 kg / 1.65 lbs
~0 Gs
3 mm 0.43 kg / 0.94 lbs
4 694 Gs
0.06 kg / 0.14 lbs
64 g / 0.6 N
 0.38 kg / 0.85 lbs
~0 Gs
5 mm 0.12 kg / 0.27 lbs
2 498 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
10 mm 0.01 kg / 0.02 lbs
743 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
165 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
17 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
10 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
7 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
5 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
3 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
3 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and steel combination. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the collision energy is massive. The repulsion force is a bit weaker than the attraction, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Calculations refer to shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - 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
Car key 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
Extremely neodym field poses a large risk to IT equipment and pacemakers. These neodymiums generate a field that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (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
NdFeB products are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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 for generator designers and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just ~20% of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*For N38 material, the max working temp 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.

Engineering data and GPSR
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: 010079-2026
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This product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø4x8 mm, guarantees the highest energy density. The MW 4x8 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.35 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 3.48 N with a weight of only 0.75 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest 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 store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 4 mm and height 8 mm. The key parameter here is the holding force amounting to approximately 0.35 kg (force ~3.48 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it 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 4 mm. 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 and weaknesses of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after around ten years it drops only by ~1% (according to research),
  • They do not lose their magnetic properties even under close interference source,
  • In other words, due to the aesthetic surface of silver, the element gains visual value,
  • Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
  • 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...
  • In view of the option of free forming and adaptation to individualized requirements, NdFeB magnets can be manufactured in a variety of shapes and sizes, which increases their versatility,
  • Huge importance in advanced technology sectors – they are utilized in HDD drives, brushless drives, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum magnetic pulling force – what affects it?

The declared magnet strength represents the maximum value, measured under ideal test conditions, specifically:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • characterized by even structure
  • with zero gap (no impurities)
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity depends on a number of factors, listed from most significant:
  • Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however 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.

Precautions when working with NdFeB magnets
Impact on smartphones

An intense magnetic field disrupts the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to avoid damaging the sensors.

Fragile material

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Magnetic media

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Adults only

Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates immediate surgery.

Warning for heart patients

Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Machining danger

Fire warning: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.

Immense force

Be careful. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Finger safety

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

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