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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

0.209 with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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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 analysis of the assembly - report

Presented values are the direct effect of a physical analysis. Values were calculated on models for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Use these data as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
MW 2x4 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 5954 Gs
595.4 mT
0.09 kg / 90.0 g
0.9 N
safe
1 mm 1696 Gs
169.6 mT
0.01 kg / 7.3 g
0.1 N
safe
2 mm 570 Gs
57.0 mT
0.00 kg / 0.8 g
0.0 N
safe
3 mm 256 Gs
25.6 mT
0.00 kg / 0.2 g
0.0 N
safe
5 mm 82 Gs
8.2 mT
0.00 kg / 0.0 g
0.0 N
safe
10 mm 15 Gs
1.5 mT
0.00 kg / 0.0 g
0.0 N
safe
15 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
safe
20 mm 2 Gs
0.2 mT
0.00 kg / 0.0 g
0.0 N
safe
30 mm 1 Gs
0.1 mT
0.00 kg / 0.0 g
0.0 N
safe
50 mm 0 Gs
0.0 mT
0.00 kg / 0.0 g
0.0 N
safe
Table 2: Shear hold (wall)
MW 2x4 / N38
Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.02 kg / 18.0 g
0.2 N
1 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
2 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 2x4 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.03 kg / 27.0 g
0.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.02 kg / 18.0 g
0.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.01 kg / 9.0 g
0.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.05 kg / 45.0 g
0.4 N
Table 4: Material efficiency (saturation) - power losses
MW 2x4 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.01 kg / 9.0 g
0.1 N
1 mm
25%
0.02 kg / 22.5 g
0.2 N
2 mm
50%
0.05 kg / 45.0 g
0.4 N
5 mm
100%
0.09 kg / 90.0 g
0.9 N
10 mm
100%
0.09 kg / 90.0 g
0.9 N
Table 5: Thermal resistance (stability) - power drop
MW 2x4 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.09 kg / 90.0 g
0.9 N
OK
40 °C -2.2% 0.09 kg / 88.0 g
0.9 N
OK
60 °C -4.4% 0.09 kg / 86.0 g
0.8 N
OK
80 °C -6.6% 0.08 kg / 84.1 g
0.8 N
100 °C -28.8% 0.06 kg / 64.1 g
0.6 N
Table 6: Two magnets (repulsion) - forces in the system
MW 2x4 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 0.69 kg / 687 g
6.7 N
6 090 Gs
N/A
1 mm 0.21 kg / 208 g
2.0 N
6 559 Gs
0.19 kg / 187 g
1.8 N
~0 Gs
2 mm 0.06 kg / 56 g
0.5 N
3 391 Gs
0.05 kg / 50 g
0.5 N
~0 Gs
3 mm 0.02 kg / 17 g
0.2 N
1 883 Gs
0.02 kg / 15 g
0.2 N
~0 Gs
5 mm 0.00 kg / 3 g
0.0 N
743 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
10 mm 0.00 kg / 0 g
0.0 N
165 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
20 mm 0.00 kg / 0 g
0.0 N
30 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
3 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
Table 7: Safety (HSE) (implants) - warnings
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
Mobile device 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
Table 8: Dynamics (kinetic energy) - 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
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)
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)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Plate thickness effect

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

3. Heat tolerance

*For N38 material, the critical limit 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: 010055-2025
Magnet Unit Converter
Magnet pull force

Magnetic Induction

See also products

This product is an exceptionally strong cylindrical magnet, manufactured from modern NdFeB material, which, at dimensions of Ø2x4 mm, guarantees optimal power. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 0.86 N with a weight of only 0.09 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. 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 in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 2 mm and height 4 mm. The key parameter here is the lifting capacity amounting to approximately 0.09 kg (force ~0.86 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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. Such an arrangement is standard 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.

Benefits
Besides their durability, neodymium magnets are valued for these benefits:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (according to analyses),
  • Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a shiny nickel surface looks better,
  • Magnets possess huge magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in constructing and the capacity to adapt to specific needs,
  • Universal use in electronics industry – they serve a role in computer drives, drive modules, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
Cons of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products can complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Highest magnetic holding forcewhat contributes to it?
Information about lifting capacity was defined for the most favorable conditions, assuming:
  • with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a thickness minimum 10 mm
  • with a plane free of scratches
  • with direct contact (without coatings)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature
Practical aspects of lifting capacity – factors
Holding efficiency impacted by specific conditions, mainly (from priority):
  • Distance (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for encased magnets.

Heat warning

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Risk of cracking

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Danger to the youngest

Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

Mechanical processing

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Magnetic media

Do not bring magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Keep away from electronics

A powerful magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.

Medical interference

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Conscious usage

Handle magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.

Finger safety

Protect your hands. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Caution! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98