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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

technical parameters »

0.209 ZŁ with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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Lifting power as well as shape of a magnet can be verified on our magnetic mass calculator.

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Technical of the product - 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 product - data

Presented data are the outcome of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
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 pounds
90.0 g / 0.9 N
 weak grip
1 mm 1696 Gs
169.6 mT
 0.01 kg / 0.02 pounds
7.3 g / 0.1 N
 weak grip
2 mm 570 Gs
57.0 mT
 0.00 kg / 0.00 pounds
0.8 g / 0.0 N
 weak grip
3 mm 256 Gs
25.6 mT
 0.00 kg / 0.00 pounds
0.2 g / 0.0 N
 weak grip
5 mm 82 Gs
8.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
10 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
15 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
20 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 0 Gs
0.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Pulling power weakens significantly per each millimeter of spacing. Note that even a very thin break (e.g., contamination, paint, veneer) significantly diminishes the holding power. Magnetic products work optimally in perfect adhesion; distance kills the force. Analyze how rapidly the load capacity plummet, when the product does not touch directly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Slippage 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 pounds
18.0 g / 0.2 N
1 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
2 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the theoretical shear load sufficient to cause the downward movement of the magnet down along a vertical metal surface (considering standard friction coefficient). The holding force depends on the distance between the magnet and the surface.

Table 3: Wall mounting (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 pounds
27.0 g / 0.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.01 kg / 0.02 pounds
9.0 g / 0.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.05 kg / 0.10 pounds
45.0 g / 0.4 N
When placing a magnet on a vertical surface (e.g., a board), it you can count on just about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that holders slip faster than they detach. Want to create a hanger? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter weight. Utilizing a rubberized pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 2x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.01 kg / 0.02 pounds
9.0 g / 0.1 N
1 mm
25%
 0.02 kg / 0.05 pounds
22.5 g / 0.2 N
2 mm
50%
 0.05 kg / 0.10 pounds
45.0 g / 0.4 N
3 mm
75%
 0.07 kg / 0.15 pounds
67.5 g / 0.7 N
5 mm
100%
 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
10 mm
100%
 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
11 mm
100%
 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
12 mm
100%
 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
A thin sheet cannot absorb the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a weak sheet, the field will pass right through and the holding will be smaller. To achieve the maximum of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the product holds weaker. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MW 2x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
 OK
40 °C -2.2% 0.09 kg / 0.19 pounds
88.0 g / 0.9 N
 OK
60 °C -4.4% 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
 OK
80 °C -6.6% 0.08 kg / 0.19 pounds
84.1 g / 0.8 N
100 °C -28.8% 0.06 kg / 0.14 pounds
64.1 g / 0.6 N
Classic neodymiums lose strength past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this product. With increasing heat, the neodymium's force briefly drops. Avoid using this magnet in hot environments exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) may lose charge permanently at lower temperatures than long magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 2x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.69 kg / 1.51 pounds
6 090 Gs
0.10 kg / 0.23 pounds
103 g / 1.0 N
 N/A
1 mm 0.21 kg / 0.46 pounds
6 559 Gs
0.03 kg / 0.07 pounds
31 g / 0.3 N
 0.19 kg / 0.41 pounds
~0 Gs
2 mm 0.06 kg / 0.12 pounds
3 391 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
3 mm 0.02 kg / 0.04 pounds
1 883 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
5 mm 0.00 kg / 0.01 pounds
743 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
10 mm 0.00 kg / 0.00 pounds
165 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
0 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
0 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a wider radius than a neodymium and metal combination. The setup of two magnets creates a more powerful interaction and a larger range of action. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still large.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Note: Figures apply to friction force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
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
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a field that prevents correct functioning of digital equipment. Remember: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (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)
Flux value passing through the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

*For standard magnets, 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.

Engineering data and GPSR
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%
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 a very strong cylinder magnet, manufactured from durable NdFeB material, which, with dimensions of Ø2x4 mm, guarantees maximum efficiency. The MW 2x4 / N38 model boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.09 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, 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 cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger 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.
This model is characterized by dimensions Ø2x4 mm, which, at a weight of 0.09 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity 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 external factors, 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 neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
  • Magnets perfectly resist against loss of magnetization caused by foreign field sources,
  • In other words, due to the smooth layer of silver, the element gains visual value,
  • Magnets possess extremely high magnetic induction on the surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Considering the option of free molding and adaptation to specialized needs, neodymium magnets can be produced in a broad palette of geometric configurations, which makes them more universal,
  • Universal use in electronics industry – they are used in mass storage devices, electric drive systems, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Holding force of 0.09 kg is a theoretical maximum value executed under standard conditions:
  • with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is affected by specific conditions, such as (from most important):
  • Distance – existence of any layer (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Compass and GPS

A powerful magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.

Handling guide

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Operating temperature

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.

Life threat

People with a ICD should keep an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Bodily injuries

Protect your hands. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Allergy Warning

Some people experience a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to dermatitis. It is best to wear protective gloves.

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Flammability

Powder generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Protect data

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Swallowing risk

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of kids and pets.

Danger! Want to know more? Read our article: Are neodymium magnets dangerous?