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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 data - 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 simulation of the product - report

Presented values are the direct effect of a mathematical simulation. Results rely on models for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - characteristics
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: Sliding hold (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

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 (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

Table 5: Working in heat (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

Table 6: Two magnets (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

Table 7: Hazards (electronics) - warnings
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
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: Dynamics (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: Anti-corrosion coating durability
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical surface, the magnet holds just a fraction of its max power.

2. Steel saturation

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

3. Heat tolerance

*For standard magnets, the critical limit 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.

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%
Sustainability
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
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Pulling force

Magnetic Induction

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This product is an extremely powerful cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø5x4 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it a perfect 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 warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. 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 tolerance of ±0.1mm, the recommended way 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 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 operational stability. 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 store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 4 mm. 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 secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder 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 through the diameter if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
  • Magnets are characterized by excellent magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in designing and the ability to modify to complex applications,
  • Huge importance in advanced technology sectors – they are utilized in mass storage devices, electric motors, medical devices, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

The force parameter is a measurement result performed under standard conditions:
  • on a block made of mild steel, optimally conducting the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Maximum temperature

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Warning for heart patients

Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Fire warning

Powder created during machining of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Avoid contact if allergic

Studies show that nickel (standard magnet coating) is a potent allergen. If you have an allergy, avoid direct skin contact and opt for coated magnets.

Data carriers

Avoid bringing magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Crushing risk

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

Magnetic interference

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.

Fragile material

NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them cracking into shards.

Caution required

Use magnets consciously. Their immense force can shock even experienced users. Be vigilant and respect their force.

Keep away from children

Always keep magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.

Important! More info about hazards in the article: Safety of working with magnets.