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MW 2x4 / N38 - cylindrical magnet

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

597.70 mT / 5977 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 ~ ?	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	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

Engineering analysis of the product - technical parameters

These information constitute the direct effect of a mathematical analysis. Results were calculated on algorithms for the material Nd₂Fe₁₄B. Real-world conditions might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - power drop
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

Pulling power decreases drastically with every mm of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, dust) noticeably diminishes the holding power. Magnetic products operate most effectively during direct contact; distance weakens the power. See how rapidly the pull force fall, when the magnet does not adhere directly to the steel surface. When planning the mounting, eliminate redundant distances.

Table 2: Vertical Hold (Vertical Surface)
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

The following data shows the approximate holding capacity necessary to initiate the slippage of the magnet down on a vertical metal surface (assuming typical friction). This parameter is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (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 upright plane (e.g., a car body), it will maintain barely about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that products slide down easier than they pull off. Designing a hanger? Note that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a much lighter load. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (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

A thin sheet is unable to take in the full magnetic flux, which weakens actual performance of the magnet. 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 full efficiency of this magnet's power, you need a suitably thick piece of steel. The saturation effect causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - 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

Standard neodymium magnets lose parameters above the temperature limit. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With increasing heat, the magnet's force briefly drops. Refrain from using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
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

Two magnets attract each other from a wider radius than a neodymium and metal combination. The connection of two magnets produces a massive flux and a further horizon of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still large.
*Field value in repulsion mode reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (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
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

Powerful magnet radiation is a real danger to electronic devices as well as medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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

Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Design data (Pc)
MW 2x4 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	209 Mx	2.1 µWb
Współczynnik Pc	1.21	Wysoki (Stabilny)

Flux value emitted by the magnet pole. Essential parameter for generator builders and Hall effect devices. Pc Factor defines the magnet 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%

Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Caution: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Steel saturation

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

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

Magnet Unit Converter

Magnet Pull Force

Newtons (N)

lbs

Magnetic Field

Induction (Gs)

Tesla (T)

Input data into a field, and all other values convert automatically.

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The offered product is an exceptionally strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø2x4 mm, guarantees the highest energy density. The MW 2x4 / N38 model features high dimensional repeatability and industrial build quality, making it a perfect 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 European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is created for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction 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 every gram matters.

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 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.

Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. 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 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 holding force 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 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.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:

Their power remains stable, and after around ten years it decreases only by ~1% (according to research),
Magnets effectively defend themselves against demagnetization caused by ambient magnetic noise,
Thanks to the smooth finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
The surface of neodymium magnets generates a powerful 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 shape) at temperatures up to 230°C and above...
Possibility of individual machining as well as adapting to defined conditions,
Universal use in future technologies – they find application in HDD drives, electromotive mechanisms, precision medical tools, as well as industrial machines.
Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of neodymium magnets:

At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
Limited possibility of producing nuts in the magnet and complex forms - recommended is cover - magnet mounting.
Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these products can complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what it depends on?

The force parameter is a result of laboratory testing executed under standard conditions:

using a plate made of mild steel, acting as a circuit closing element
possessing a thickness of minimum 10 mm to avoid saturation
characterized by smoothness
without the slightest air gap between the magnet and steel
for force applied at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

It is worth knowing that the working load will differ depending on the following factors, starting with the most relevant:

Distance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets

ICD Warning

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Do not underestimate power

Exercise caution. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Do not drill into magnets

Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Keep away from computers

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Heat warning

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Compass and GPS

An intense magnetic field disrupts the operation of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.

Nickel allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and use protective gear.

Keep away from children

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

Physical harm

Large magnets can break fingers instantly. Never place your hand between two strong magnets.

Safety First! Looking for details? Read our article: Why are neodymium magnets dangerous?

MW 2x4 / N38 - cylindrical magnet

Want to talk magnets?

MW 2x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the product - technical parameters

1. Shear force

2. Steel saturation

3. Power loss vs temp

Magnet Pull Force

Magnetic Field

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MW 7x2 / N38 - cylindrical magnet

MPL 25x25x10 / N38 - lamellar magnet

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

SM 32x500 [2xM8] / N42 - magnetic separator

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Weaknesses

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what it depends on?

Lifting capacity in practice – influencing factors

ICD Warning

Do not underestimate power

Risk of cracking

Do not drill into magnets

Keep away from computers

Heat warning

Compass and GPS

Nickel allergy

Keep away from children

Physical harm

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.