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MW 4x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010079

GTIN/EAN: 5906301810780

5.00
Load capacity 0.35 kg / 3.48 N Magnetic Induction 599.59 mT / 5996 Gs
Diameter Ø
4 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
0.75 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical details »

0.701 zł with VAT / pcs + price for transport

0.570 zł net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Product card - 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

Technical simulation of the product - report

These information constitute the result of a physical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
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
Pulling power drops drastically per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products operate most effectively at the point of direct contact; distance weakens the power. Notice how rapidly the load capacity drop, when the product does not touch flatly to the metal substrate. When calculating the arrangement, avoid additional spacers.

Table 2: Slippage hold (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
The following data presents the approximate shear load required to cause the slippage of the magnet vertically along a vertical metal surface (assuming standard friction). The holding force is relative to the gap size between the magnet and the metal.

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 hanging a element on a vertical surface (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that products slip faster than they pull off. Want to create a hanger? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter load. Application of an anti-slip layer can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
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 too thin steel is unable to conduct the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the product works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - 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 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 parameters after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly destroy this magnet. As the temperature rises, the neodymium's power briefly lowers. Do not use this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties sooner compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 4x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 magnetic products interact from a much further distance than a magnet and sheet setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Estimates show shear force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
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
Powerful magnet radiation poses a real danger to electronics and medical implants. These neodymiums generate a flux that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 9.99 km/h
(2.77 m/s)
 0.00 J
30 mm 9.99 km/h
(2.77 m/s)
 0.00 J
50 mm 9.99 km/h
(2.77 m/s)
 0.00 J
100 mm 9.99 km/h
(2.78 m/s)
 0.00 J
NdFeB products are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or injury to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Wear safety glasses when playing 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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines 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.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

*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) = 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 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: 010079-2026
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The offered product is an extremely powerful rod magnet, produced from durable NdFeB material, which, with dimensions of Ø4x8 mm, guarantees the highest energy density. The MW 4x8 / N38 component 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 significant force (approx. 0.35 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 3.48 N with a weight of only 0.75 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance 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 available off-the-shelf 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 lifting capacity amounting to approximately 0.35 kg (force ~3.48 N), which, with such compact 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.
This cylinder 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 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.

Advantages as well as disadvantages of neodymium magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual creating as well as optimizing to concrete conditions,
  • Key role in advanced technology sectors – they are used in computer drives, electric motors, medical equipment, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Magnetic strength at its maximum – what affects it?

The declared magnet strength concerns the maximum value, recorded under laboratory conditions, namely:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • whose thickness is min. 10 mm
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

During everyday use, the actual holding force depends on several key aspects, ranked from the most important:
  • Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets
Handling rules

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

Combustion hazard

Dust generated during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Operating temperature

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Nickel allergy

Some people have a contact allergy to nickel, which is the standard coating for neodymium magnets. Prolonged contact might lead to a rash. It is best to wear safety gloves.

Danger to pacemakers

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

This is not a toy

Product intended for adults. Tiny parts can be swallowed, leading to severe trauma. Keep away from kids and pets.

Phone sensors

Remember: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Physical harm

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Beware of splinters

NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them cracking into small pieces.

Magnetic media

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Danger! Learn more about hazards in the article: Magnet Safety Guide.