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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

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0.369 ZŁ with VAT / pcs + price for transport

0.300 ZŁ net + 23% VAT / pcs

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Technical details - 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

Technical analysis of the magnet - report

These values represent the outcome of a mathematical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - 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
 low risk
1 mm 3243 Gs
324.3 mT
 0.32 kg / 0.71 lbs
322.1 g / 3.2 N
 low risk
2 mm 1850 Gs
185.0 mT
 0.10 kg / 0.23 lbs
104.8 g / 1.0 N
 low risk
3 mm 1076 Gs
107.6 mT
 0.04 kg / 0.08 lbs
35.5 g / 0.3 N
 low risk
5 mm 428 Gs
42.8 mT
 0.01 kg / 0.01 lbs
5.6 g / 0.1 N
 low risk
10 mm 89 Gs
8.9 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
15 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Magnetic force drops sharply per each millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) strongly diminishes the holding power. Neodymiums work most effectively in perfect adhesion; gap drastically cuts the power. Observe how quickly the pull force plummet, when the product does not adhere directly to the steel surface. When planning the mounting, discard redundant distances.

Table 2: Vertical capacity (wall)
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
The table below indicates the approximate holding capacity needed to start the sliding of the magnet down on a upright steel plate (assuming typical friction). This parameter is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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
When placing a magnet on a vertical plane (e.g., a car body), it will maintain barely about 1/5 of its nominal power. Gravity as well as a low friction coefficient mean that holders slip easier than they pull off. Planning a wall mount? Note that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a noticeably lighter weight. Application of an anti-slip pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
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
A too thin steel is unable to conduct the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation means that on thin elements (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - resistance threshold
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
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly damage this product. With increasing heat, the magnet's force briefly lowers. Avoid using this magnet near heat sources exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetic properties.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 5x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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
Two strong neodymiums attract each other from a much further distance than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a wider radius of operation. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still impressive.
*Field value in repulsion mode reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Estimates refer to sliding force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
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) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field is a real danger to electronics and pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - 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
Magnetic elements are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or injury to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when handling with large magnets.

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)
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: Electrical data (Flux)
MW 5x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 046 Mx 10.5 µWb
Pc Coefficient 0.79 High (Stable)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

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%
Rust risk: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

*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

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
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%
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: 010089-2026
Measurement Calculator
Pulling force
Magnetic Induction
Type data in any box, to see the rest will convert automatically.

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This product is a very strong cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø5x4 mm, guarantees the highest energy density. This specific item features a tolerance 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. 0.84 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 8.24 N with a weight of only 0.59 g, this rod is indispensable in electronics and wherever low weight is crucial.
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 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 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 (Ø5x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf 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 oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Advantages and disadvantages of neodymium magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets very well resist against demagnetization caused by foreign field sources,
  • By applying a decorative coating of nickel, the element has an modern look,
  • They are known for 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...
  • Thanks to flexibility in forming and the capacity to adapt to complex applications,
  • Fundamental importance in high-tech industry – they are used in hard drives, electric motors, medical devices, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Problematic aspects of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power 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 very resistant to heat
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complex forms - preferred is a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

Information about lifting capacity was defined for the most favorable conditions, assuming:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a surface free of scratches
  • with direct contact (no coatings)
  • under vertical force vector (90-degree angle)
  • at room temperature

What influences lifting capacity in practice

Please note that the application force may be lower subject to the following factors, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Data carriers

Very strong magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Protective goggles

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Implant safety

People with a ICD must maintain an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Choking Hazard

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

GPS Danger

Navigation devices and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Mechanical processing

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Crushing risk

Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Immense force

Handle magnets with awareness. Their powerful strength can shock even experienced users. Stay alert and respect their power.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?