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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/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 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/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

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

Pulling power weakens sharply with every mm of gap. Remember that even the smallest gap (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnetic products operate optimally in perfect adhesion; air break kills the power. Notice how rapidly the pull force plummet, when the magnet does not adhere tightly to the steel surface. When planning the mounting, avoid additional spacers.

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

The following data presents the theoretical holding capacity sufficient to cause the slippage of the magnet down along a upright steel wall (considering standard friction coefficient). This value varies with the distance between the magnet and the metal.

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

When hanging a holder on a vertical surface (e.g., a car body), it you can count on only about 1/5 of its nominal power. Gravity and a weak degree of grip influence the fact that products slide down easier than they detach. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller load. Utilizing a rubberized pad can significantly raise the stability.

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

A thin metal plate is unable to absorb the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To achieve full efficiency of this magnet's potential, you require a sufficiently solid element of metal. The material oversaturation means that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel cross-section according to the table below.

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

Ordinary NdFeB products lose strength past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this product. As the temperature rises, the neodymium's force temporarily drops. Avoid using this magnet close to heaters higher than its working range. Ignoring the limit will result in irreversible degradation of magnetism.

*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table indicates a risk of irreversible loss for this specific geometry.

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

Two strong neodymiums interact from a much further distance than a neodymium and metal combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).

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

Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
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 delicate – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when playing with large magnets.

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)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MW 2x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	209 Mx	2.1 µWb
P_c Coefficient	1.21	High (Stable)

Flux value passing through the pole surface. Essential parameter in coil applications as well as sensors. P_c value determines the working geometry.

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.

The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

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 P_c (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 P_c (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 P_c 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

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Kilograms (kg)

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SM 32x125 [2xM8] / N52 - magnetic separator

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SM 32x450 [2xM8] / N52 - magnetic separator

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SM 32x200 [2xM8] / N42 - magnetic separator

602.70 ZŁ brutto / pcs

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SM 32x400 [2xM8] / N52 - magnetic separator

1266.90 ZŁ brutto / pcs

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 force – what 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.

MW 2x4 / N38 - cylindrical magnet

Not sure what to buy?

MW 2x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the assembly - report

1. Shear force

2. Plate thickness effect

3. Heat tolerance

4. Demagnetization curve and operating point (B-H)

Material specification

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Induction

See also products

SM 32x125 [2xM8] / N52 - magnetic separator

SM 32x450 [2xM8] / N52 - magnetic separator

SM 32x200 [2xM8] / N42 - magnetic separator

SM 32x400 [2xM8] / N52 - magnetic separator

Strengths and weaknesses of rare earth magnets.

Benefits

Disadvantages

Pull force analysis

Highest magnetic holding force – what contributes to it?

Practical aspects of lifting capacity – factors

Allergic reactions

Heat warning

Risk of cracking

Danger to the youngest

Mechanical processing

Magnetic media

Keep away from electronics

Medical interference

Conscious usage

Finger safety

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C