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MW 5x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010089

GTIN/EAN: 5906301810889

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.59 g

Magnetization Direction

↑ axial

Load capacity

0.84 kg / 8.24 N

Magnetic Induction

524.45 mT / 5244 Gs

Coating

[NiCuNi] Nickel

0.369 with VAT / pcs + price for transport

0.300 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 5x4 / N38 - cylindrical magnet

Specification / characteristics - MW 5x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010089
GTIN/EAN 5906301810889
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 5 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 0.59 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.84 kg / 8.24 N
Magnetic Induction ~ ? 524.45 mT / 5244 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x4 / 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 analysis of the assembly - technical parameters

The following data are the direct effect of a mathematical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MW 5x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5236 Gs
523.6 mT
0.84 kg / 1.85 LBS
840.0 g / 8.2 N
safe
1 mm 3243 Gs
324.3 mT
0.32 kg / 0.71 LBS
322.1 g / 3.2 N
safe
2 mm 1850 Gs
185.0 mT
0.10 kg / 0.23 LBS
104.8 g / 1.0 N
safe
3 mm 1076 Gs
107.6 mT
0.04 kg / 0.08 LBS
35.5 g / 0.3 N
safe
5 mm 428 Gs
42.8 mT
0.01 kg / 0.01 LBS
5.6 g / 0.1 N
safe
10 mm 89 Gs
8.9 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe
15 mm 31 Gs
3.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
20 mm 15 Gs
1.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Shear load (vertical surface)
MW 5x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
1 mm Stal (~0.2) 0.06 kg / 0.14 LBS
64.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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

Table 3: Wall mounting (shearing) - vertical pull
MW 5x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.25 kg / 0.56 LBS
252.0 g / 2.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.17 kg / 0.37 LBS
168.0 g / 1.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.19 LBS
84.0 g / 0.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.42 kg / 0.93 LBS
420.0 g / 4.1 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 5x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.08 kg / 0.19 LBS
84.0 g / 0.8 N
1 mm
25%
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
2 mm
50%
0.42 kg / 0.93 LBS
420.0 g / 4.1 N
3 mm
75%
0.63 kg / 1.39 LBS
630.0 g / 6.2 N
5 mm
100%
0.84 kg / 1.85 LBS
840.0 g / 8.2 N
10 mm
100%
0.84 kg / 1.85 LBS
840.0 g / 8.2 N
11 mm
100%
0.84 kg / 1.85 LBS
840.0 g / 8.2 N
12 mm
100%
0.84 kg / 1.85 LBS
840.0 g / 8.2 N

Table 5: Working in heat (stability) - power drop
MW 5x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.84 kg / 1.85 LBS
840.0 g / 8.2 N
OK
40 °C -2.2% 0.82 kg / 1.81 LBS
821.5 g / 8.1 N
OK
60 °C -4.4% 0.80 kg / 1.77 LBS
803.0 g / 7.9 N
OK
80 °C -6.6% 0.78 kg / 1.73 LBS
784.6 g / 7.7 N
100 °C -28.8% 0.60 kg / 1.32 LBS
598.1 g / 5.9 N

Table 6: Two magnets (repulsion) - field range
MW 5x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.32 kg / 7.32 LBS
5 894 Gs
0.50 kg / 1.10 LBS
498 g / 4.9 N
N/A
1 mm 2.14 kg / 4.72 LBS
8 408 Gs
0.32 kg / 0.71 LBS
321 g / 3.1 N
1.93 kg / 4.24 LBS
~0 Gs
2 mm 1.27 kg / 2.81 LBS
6 486 Gs
0.19 kg / 0.42 LBS
191 g / 1.9 N
1.15 kg / 2.53 LBS
~0 Gs
3 mm 0.73 kg / 1.61 LBS
4 909 Gs
0.11 kg / 0.24 LBS
109 g / 1.1 N
0.66 kg / 1.45 LBS
~0 Gs
5 mm 0.24 kg / 0.53 LBS
2 805 Gs
0.04 kg / 0.08 LBS
36 g / 0.4 N
0.21 kg / 0.47 LBS
~0 Gs
10 mm 0.02 kg / 0.05 LBS
857 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.04 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
177 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
16 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
9 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
6 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
4 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
2 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MW 5x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 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) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (cracking risk) - collision effects
MW 5x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 38.06 km/h
(10.57 m/s)
0.03 J
30 mm 65.91 km/h
(18.31 m/s)
0.10 J
50 mm 85.09 km/h
(23.64 m/s)
0.16 J
100 mm 120.34 km/h
(33.43 m/s)
0.33 J

Table 9: Corrosion resistance
MW 5x4 / 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 5x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 046 Mx 10.5 µWb
Pc Coefficient 0.79 High (Stable)

Table 11: Hydrostatics and buoyancy
MW 5x4 / N38

Environment Effective steel pull Effect
Air (land) 0.84 kg Standard
Water (riverbed) 0.96 kg
(+0.12 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

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

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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.

Engineering data and GPSR
Elemental analysis
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: 010089-2026
Magnet Unit Converter
Force (pull)

Magnetic Field

Other deals

The offered product is an extremely powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø5x4 mm, guarantees optimal power. This specific item features an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.84 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard 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 positioning or actuating element. Thanks to the pull force of 8.24 N with a weight of only 0.59 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø5x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø5x4 mm, which, at a weight of 0.59 g, makes it an element with high magnetic energy density. The value of 8.24 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.59 g. The product has a [NiCuNi] coating, which protects the surface against external factors, 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 5 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 diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
  • Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external field sources,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • 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 ability of free shaping and adaptation to individualized needs, magnetic components can be manufactured in a variety of geometric configurations, which expands the range of possible applications,
  • Versatile presence in modern technologies – they are utilized in data components, electric motors, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Cons

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result performed under specific, ideal conditions:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface perfectly flat
  • under conditions of no distance (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at standard ambient temperature

What influences lifting capacity in practice

It is worth knowing that the application force may be lower influenced by the following factors, starting with the most relevant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate decreases the lifting capacity.

Warnings
Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Pacemakers

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Serious injuries

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

Material brittleness

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Skin irritation risks

Medical facts indicate that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or select encased magnets.

Magnetic interference

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Respect the power

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Heat sensitivity

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Danger to the youngest

NdFeB magnets are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Do not drill into magnets

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

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