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MW 2x4 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010055

GTIN: 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

0.60 mT / 6 Gs

Coating

[NiCuNi] Nickel

0.209 ZŁ 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	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 ~ ?	0.60 mT / 6 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	T
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

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 106	°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 modeling of the product - data

The following values constitute the outcome of a mathematical calculation. Values were calculated on algorithms for the class NdFeB. Operational parameters may deviate from the simulation results. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
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
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

Magnetic force drops sharply with every mm of distance. Remember that even a very thin break (e.g., dirt, varnish, veneer) significantly weakens the grip. Neodymiums work optimally at the point of direct contact; distance kills the power. Analyze how flashily the parameters fall, when the product does not touch directly to the steel surface. When designing the arrangement, avoid redundant distances.

Table 2: Wall mounting (sliding) - 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

When mounting a holder on a vertical plane (e.g., a board), it you can count on barely approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that products slip faster than they pull off. Want to create a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will give way down under a much lighter load. Using a rubber layer can drastically improve the result.

Table 3: Steel thickness (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

A thin metal plate is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the field will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you require a sufficiently solid element of metal. The saturation effect means that on delicate walls (e.g., thin profiles), the holder works worse. We suggest choosing the steel dimension based on the following data.

Table 4: Thermal resistance (stability) - thermal limit
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

Ordinary NdFeB products change their properties parameters above the temperature limit. Protect against heat – heat can irreversibly damage this magnet. As the temperature rises, the neodymium's force briefly lowers. Avoid using this product near heat sources exceeding its working range. Too high temperature will lead to permanent loss of magnetism.

Table 5: Two magnets (attraction) - field range
MW 2x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	0.14 kg / 135.0 g 1.3 N	N/A
2 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
5 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
10 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
20 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnets attract each other from a significantly greater distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a further horizon of operation. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the attraction, but still impressive.

Table 6: Hazards (electronics) - 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
Car key	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 poses a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 7: Dynamics (kinetic energy) - collision effects
MW 2x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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 very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can cause material chips or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 8: 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. Improper coating selection is the most common cause of magnet failure over time.

Table 9: 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

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This product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø2x4 mm, guarantees optimal power. This specific item features an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.09 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 0.86 N with a weight of only 0.09 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.

Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 2.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Magnets NdFeB grade N38 are suitable for the majority of applications in automation and machine building, where excessive 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 high magnetic energy density. The value of 0.86 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.09 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.

Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 2 mm. 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They do not lose magnetism, even over around ten years – the drop in lifting capacity is only ~1% (according to tests),
They are resistant to demagnetization induced by external disturbances,
The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
Considering the option of flexible molding and adaptation to unique needs, magnetic components can be produced in a broad palette of shapes and sizes, which increases their versatility,
Huge importance in modern technologies – they serve a role in computer drives, electric motors, diagnostic systems, also modern systems.
Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets and proposals for their use:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what contributes to it?

The specified lifting capacity refers to the limit force, recorded under ideal test conditions, namely:

with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
possessing a massiveness of at least 10 mm to ensure full flux closure
with a plane free of scratches
without the slightest clearance between the magnet and steel
during detachment in a direction vertical to the plane
in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Real force is affected by specific conditions, mainly (from priority):

Clearance – the presence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Magnetic interference

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Implant safety

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.

Respect the power

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

Combustion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Demagnetization risk

Control the heat. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Cards and drives

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Crushing force

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

No play value

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

Magnets are brittle

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

Security!

Want to know more? Check our post: Are neodymium magnets dangerous?

MW 2x4 / N38 - cylindrical magnet

MW 2x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the product - data

Other deals

MPL 50x20x5 / N38 - lamellar magnet

UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

MP 5x2.7/1.2x5 C / N38 - ring magnet

UMH 32x8x46 [M6] / N38 - magnetic holder with hook

Advantages as well as disadvantages of rare earth magnets.

Maximum lifting force for a neodymium magnet – what contributes to it?

Determinants of practical lifting force of a magnet

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C