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MW 2x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010055

GTIN/EAN: 5906301810544

5.00

Diameter Ø

2 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.09 g

Magnetization Direction

↑ axial

Load capacity

0.09 kg / 0.86 N

Magnetic Induction

597.70 mT / 5977 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

0.209 ZŁ with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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Force as well as structure of magnets can be calculated on our online calculation tool.

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Technical parameters - MW 2x4 / N38 - cylindrical magnet

Specification / characteristics - MW 2x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010055
GTIN/EAN 5906301810544
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 2 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 0.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.09 kg / 0.86 N
Magnetic Induction ~ ? 597.70 mT / 5977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 2x4 / 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

Physical simulation of the product - report

The following values constitute the result of a engineering simulation. Results rely on algorithms for the class Nd2Fe14B. Real-world conditions may deviate from the simulation results. Please consider these data as a reference point when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MW 2x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5954 Gs
595.4 mT
 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
 low risk
1 mm 1696 Gs
169.6 mT
 0.01 kg / 0.02 LBS
7.3 g / 0.1 N
 low risk
2 mm 570 Gs
57.0 mT
 0.00 kg / 0.00 LBS
0.8 g / 0.0 N
 low risk
3 mm 256 Gs
25.6 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 low risk
5 mm 82 Gs
8.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
10 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
15 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
20 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
30 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
50 mm 0 Gs
0.0 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Grip strength decreases significantly with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, paint, dust) significantly weakens the grip. Magnets hold optimally at the point of direct contact; distance kills the force. Analyze how rapidly the parameters drop, when the magnet does not touch directly to the steel surface. When planning the arrangement, discard additional spacers.

Table 2: Vertical force (wall)
MW 2x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.02 kg / 0.04 LBS
18.0 g / 0.2 N
1 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
2 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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
This section presents the approximate holding capacity sufficient to initiate the sliding of the magnet downwards along a vertical steel wall (considering typical friction). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 2x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.03 kg / 0.06 LBS
27.0 g / 0.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.01 kg / 0.02 LBS
9.0 g / 0.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
When mounting a holder on a upright surface (e.g., a car body), it will only hold only approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient mean that magnets slide down faster than they pop off the substrate. Planning a hanger? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a significantly smaller weight. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MW 2x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.01 kg / 0.02 LBS
9.0 g / 0.1 N
1 mm
25%
 0.02 kg / 0.05 LBS
22.5 g / 0.2 N
2 mm
50%
 0.05 kg / 0.10 LBS
45.0 g / 0.4 N
3 mm
75%
 0.07 kg / 0.15 LBS
67.5 g / 0.7 N
5 mm
100%
 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
10 mm
100%
 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
11 mm
100%
 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
12 mm
100%
 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
A thin metal plate is not enough to focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a thin surface, the field will pass right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you need a suitably thick piece of steel. The saturation effect means that on delicate walls (e.g., car bodies), the magnet works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MW 2x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
 OK
40 °C -2.2% 0.09 kg / 0.19 LBS
88.0 g / 0.9 N
 OK
60 °C -4.4% 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
 OK
80 °C -6.6% 0.08 kg / 0.19 LBS
84.1 g / 0.8 N
100 °C -28.8% 0.06 kg / 0.14 LBS
64.1 g / 0.6 N
Ordinary NdFeB products change their properties strength past the thermal threshold. Watch out for overheating – heat can permanently demagnetize this product. As the temperature rises, the neodymium's power briefly drops. Avoid using this magnet in hot environments exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress than taller cylinders. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 2x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.69 kg / 1.51 LBS
6 090 Gs
0.10 kg / 0.23 LBS
103 g / 1.0 N
 N/A
1 mm 0.21 kg / 0.46 LBS
6 559 Gs
0.03 kg / 0.07 LBS
31 g / 0.3 N
 0.19 kg / 0.41 LBS
~0 Gs
2 mm 0.06 kg / 0.12 LBS
3 391 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
3 mm 0.02 kg / 0.04 LBS
1 883 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
5 mm 0.00 kg / 0.01 LBS
743 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
10 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
20 mm 0.00 kg / 0.00 LBS
30 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
3 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
2 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
1 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
1 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
0 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
0 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 steel combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Estimates demonstrate sliding force of a pair of identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 2x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.0 cm
Hearing aid 10 Gs (1.0 mT) 1.5 cm
Mechanical watch 20 Gs (2.0 mT) 1.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.0 cm
Remote 50 Gs (5.0 mT) 1.0 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 is a serious hazard to electronics and medical implants. These neodymiums generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 2x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.89 km/h
(8.86 m/s)
 0.00 J
30 mm 55.24 km/h
(15.34 m/s)
 0.01 J
50 mm 71.31 km/h
(19.81 m/s)
 0.02 J
100 mm 100.85 km/h
(28.01 m/s)
 0.04 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 2x4 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 2x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 209 Mx 2.1 µWb
Pc Coefficient 1.21 High (Stable)
Total magnetic flux passing through the pole surface. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 2x4 / N38

Environment Effective steel pull Effect
Air (land) 0.09 kg Standard
Water (riverbed) 0.10 kg
(+0.01 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For N38 material, the max working temp 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 specification and ecology
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: 010055-2026
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The presented product is an extremely powerful cylindrical magnet, manufactured from durable NdFeB material, which, at dimensions of Ø2x4 mm, guarantees maximum efficiency. The MW 2x4 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.09 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 0.86 N with a weight of only 0.09 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 immediate cracking of this professional component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø2x4), 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 2 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 0.09 kg (force ~0.86 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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. 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.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by external field sources,
  • Thanks to the smooth finish, the plating of nickel, gold, or silver-plated gives an professional appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • 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...
  • Considering the possibility of free forming and customization to custom projects, neodymium magnets can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
  • Huge importance in innovative solutions – they find application in data components, motor assemblies, precision medical tools, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in small systems

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • on a base made of structural steel, optimally conducting the magnetic field
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • with direct contact (no coatings)
  • during detachment in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

During everyday use, the real power depends on several key aspects, listed from most significant:
  • Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Fragile material

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Medical implants

Individuals with a pacemaker should maintain an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Nickel allergy

Studies show that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands and select encased magnets.

Impact on smartphones

GPS units and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Bodily injuries

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Do not underestimate power

Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and do not underestimate their force.

Maximum temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Choking Hazard

Always keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are life-threatening.

Magnetic media

Intense magnetic fields can destroy records on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

Flammability

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

Important! Need more info? Check our post: Are neodymium magnets dangerous?