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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

check technical data »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Engineering simulation of the assembly - technical parameters

These data are the direct effect of a physical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - 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 weakens drastically per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, rust) strongly diminishes the holding power. Magnetic products hold most effectively during direct contact; gap kills the force. Analyze how quickly the load capacity fall, when the magnet does not adhere directly to the steel surface. When planning the mounting, discard 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 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 defines the estimated holding capacity needed to initiate the sliding of the magnet vertically on a upright metal surface (considering standard friction coefficient). This parameter depends on the air gap 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 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 magnet on a vertical surface (e.g., a board), it will maintain barely approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip influence the fact that magnets slide down faster than they detach. Designing a wall mount? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will give way down under a much lighter cargo. Utilizing a rubberized coating can significantly improve the result.

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 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 unable to take in the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the holding will be smaller. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., car bodies), the magnet works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (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 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 strength above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this product. With increasing heat, the neodymium's force temporarily lowers. Refrain from using this product close to ovens exceeding its safe range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - 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 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 neodymium and metal combination. The setup of two magnets produces a massive flux and a further horizon of action. Want to build a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Calculations refer to sliding force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
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
Phone / Smartphone 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 large risk to electronics as well as medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
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
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
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 magnet pole. Key data in coil applications and motors. The Pc coefficient defines the working geometry.

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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

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

2. Plate thickness effect

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Temperature resistance

*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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
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%
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
Magnet Unit Converter
Force (pull)
Magnetic Induction
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The presented product is an extremely powerful rod magnet, made from modern NdFeB material, which, at dimensions of Ø4x8 mm, guarantees optimal power. The MW 4x8 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.35 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 3.48 N with a weight of only 0.75 g, this rod is indispensable in miniature devices 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., 4.1 mm) using two-component 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 frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 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 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 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 4 mm. 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 rare earth magnets.

Advantages

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external interference,
  • A magnet with a metallic gold surface has an effective appearance,
  • Neodymium magnets generate 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 form) at temperatures up to 230°C and above...
  • Thanks to the potential of free forming and customization to specialized needs, magnetic components can be produced in a wide range of forms and dimensions, which expands the range of possible applications,
  • Universal use in high-tech industry – they are used in hard drives, motor assemblies, medical equipment, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making nuts in the magnet and complicated shapes - preferred is a housing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

The declared magnet strength concerns the maximum value, measured under laboratory conditions, meaning:
  • on a block made of structural steel, effectively closing the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Key elements affecting lifting force

In practice, the actual holding force is determined by many variables, presented from most significant:
  • Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Fire warning

Dust generated during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Threat to electronics

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

Demagnetization risk

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Bone fractures

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, crushing anything in their path. Be careful!

Skin irritation risks

Some people have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling may cause a rash. We suggest use safety gloves.

Choking Hazard

Strictly keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.

Eye protection

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Immense force

Use magnets with awareness. Their immense force can surprise even professionals. Plan your moves and respect their force.

Impact on smartphones

An intense magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a smartphone to prevent damaging the sensors.

Safety First! More info about risks in the article: Safety of working with magnets.