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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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Parameters as well as structure of neodymium magnets can be tested with our modular calculator.

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Physical properties - 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

Technical simulation of the magnet - report

Presented data represent the outcome of a engineering simulation. Values rely on algorithms for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Use these calculations as a preliminary roadmap for designers.

Table 1: Static force (force 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
low risk
1 mm 1696 Gs
169.6 mT
0.01 kg / 7.3 g
0.1 N
low risk
2 mm 570 Gs
57.0 mT
0.00 kg / 0.8 g
0.0 N
low risk
3 mm 256 Gs
25.6 mT
0.00 kg / 0.2 g
0.0 N
low risk
5 mm 82 Gs
8.2 mT
0.00 kg / 0.0 g
0.0 N
low risk
10 mm 15 Gs
1.5 mT
0.00 kg / 0.0 g
0.0 N
low risk
15 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
low risk
20 mm 2 Gs
0.2 mT
0.00 kg / 0.0 g
0.0 N
low risk
30 mm 1 Gs
0.1 mT
0.00 kg / 0.0 g
0.0 N
low risk
50 mm 0 Gs
0.0 mT
0.00 kg / 0.0 g
0.0 N
low risk

Table 2: Shear force (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: Wall mounting (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: Steel thickness (substrate influence) - 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 stability (stability) - resistance threshold
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 (attraction) - field range
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: Protective zones (electronics) - 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
Timepiece 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

Table 8: Collisions (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

Table 9: Corrosion resistance
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: Electrical 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: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Steel thickness impact

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

3. Thermal stability

*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) = 1.21

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.

Technical specification and ecology
Chemical composition
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: 010055-2025
Measurement Calculator
Force (pull)

Magnetic Field

See also products

The offered product is an incredibly powerful cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø2x4 mm, guarantees optimal power. This specific item features a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. 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 every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets 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.
This model is characterized by dimensions Ø2x4 mm, which, at a weight of 0.09 g, makes it an element with impressive magnetic energy density. 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 grade 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 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 through the diameter if your project requires it.

Advantages and disadvantages of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately ten years it drops only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • Thanks to the reflective finish, the coating of nickel, gold-plated, or silver gives an clean appearance,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
  • 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...
  • Possibility of custom shaping and modifying to complex conditions,
  • Huge importance in future technologies – they are commonly used in hard drives, drive modules, precision medical tools, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 resistant to moisture
  • We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Information about lifting capacity was defined for the most favorable conditions, taking into account:
  • on a plate made of mild steel, effectively closing the magnetic field
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • without any air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:
  • Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Load vector – highest force is available only during perpendicular pulling. The resistance to sliding 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 adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Cast iron may attract less.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets
Do not overheat magnets

Keep cool. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

ICD Warning

Patients with a ICD have to maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Machining danger

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

This is not a toy

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from children and animals.

Threat to navigation

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Magnets are brittle

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them shattering into small pieces.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and choose versions in plastic housing.

Electronic devices

Data protection: Strong magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Do not underestimate power

Handle with care. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.

Finger safety

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

Caution! Details about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98