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MW 4x5 / 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 010077

GTIN/EAN: 5906301810766

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

0.47 g

Magnetization Direction

↑ axial

Load capacity

0.46 kg / 4.48 N

Magnetic Induction

573.83 mT / 5738 Gs

Coating

[NiCuNi] Nickel

0.320 ZŁ with VAT / pcs + price for transport

0.260 ZŁ net + 23% VAT / pcs

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MW 4x5 / N38 - cylindrical magnet

Specification / characteristics MW 4x5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010077
GTIN/EAN	5906301810766
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	4 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	0.47 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.46 kg / 4.48 N
Magnetic Induction ~ ?	573.83 mT / 5738 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x5 / 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

Technical modeling of the magnet - report

Presented values represent the direct effect of a engineering analysis. Results were calculated on algorithms for the class Nd₂Fe₁₄B. Real-world performance might slightly differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MW 4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5727 Gs 572.7 mT	0.46 kg / 460.0 g 4.5 N	weak grip
1 mm	3109 Gs 310.9 mT	0.14 kg / 135.6 g 1.3 N	weak grip
2 mm	1577 Gs 157.7 mT	0.03 kg / 34.9 g 0.3 N	weak grip
3 mm	856 Gs 85.6 mT	0.01 kg / 10.3 g 0.1 N	weak grip
5 mm	323 Gs 32.3 mT	0.00 kg / 1.5 g 0.0 N	weak grip
10 mm	66 Gs 6.6 mT	0.00 kg / 0.1 g 0.0 N	weak grip
15 mm	24 Gs 2.4 mT	0.00 kg / 0.0 g 0.0 N	weak grip
20 mm	11 Gs 1.1 mT	0.00 kg / 0.0 g 0.0 N	weak grip
30 mm	4 Gs 0.4 mT	0.00 kg / 0.0 g 0.0 N	weak grip
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Grip strength decreases drastically per each millimeter of distance. Remember that even the smallest gap (e.g., dirt, varnish, dust) significantly weakens the grip. Magnetic products operate most effectively during direct contact; air break drastically cuts the power. See how rapidly the load capacity fall, when the product does not touch directly to the steel surface. When planning the arrangement, eliminate additional spacers.

Table 2: Shear capacity (wall)
MW 4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.09 kg / 92.0 g 0.9 N
1 mm	Stal (~0.2)	0.03 kg / 28.0 g 0.3 N
2 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 2.0 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 table below calculates the estimated weight limit sufficient to cause the sliding of the magnet vertically along a vertical steel plate (considering standard friction coefficient). This value varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.14 kg / 138.0 g 1.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.09 kg / 92.0 g 0.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.05 kg / 46.0 g 0.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.23 kg / 230.0 g 2.3 N

When hanging a element on a upright plane (e.g., a fridge), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that products slip easier than they pull off. Designing a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the holder will give way down under a significantly smaller weight. Using a rubber pad can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MW 4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.05 kg / 46.0 g 0.5 N
1 mm	25%	0.12 kg / 115.0 g 1.1 N
2 mm	50%	0.23 kg / 230.0 g 2.3 N
5 mm	100%	0.46 kg / 460.0 g 4.5 N
10 mm	100%	0.46 kg / 460.0 g 4.5 N

A too thin steel is incapable of take in the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve the maximum of this magnet's power, you require a sufficiently solid piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., appliance housings), the holder works worse. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MW 4x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.46 kg / 460.0 g 4.5 N	OK
40 °C	-2.2%	0.45 kg / 449.9 g 4.4 N	OK
60 °C	-4.4%	0.44 kg / 439.8 g 4.3 N	OK
80 °C	-6.6%	0.43 kg / 429.6 g 4.2 N
100 °C	-28.8%	0.33 kg / 327.5 g 3.2 N

Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can permanently damage this magnet. With every degree above norm, the neodymium's power momentarily lowers. Avoid using this product close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause destruction of magnetism.

*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 4x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.54 kg / 2541 g 24.9 N 6 049 Gs	N/A
1 mm	1.45 kg / 1448 g 14.2 N 8 646 Gs	1.30 kg / 1303 g 12.8 N ~0 Gs
2 mm	0.75 kg / 749 g 7.3 N 6 218 Gs	0.67 kg / 674 g 6.6 N ~0 Gs
3 mm	0.38 kg / 377 g 3.7 N 4 412 Gs	0.34 kg / 339 g 3.3 N ~0 Gs
5 mm	0.10 kg / 102 g 1.0 N 2 299 Gs	0.09 kg / 92 g 0.9 N ~0 Gs
10 mm	0.01 kg / 8 g 0.1 N 646 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
20 mm	0.00 kg / 0 g 0.0 N 132 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 12 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a larger range of operation. Designing a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the impact force is massive. The levitation is marginally weaker than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).

Table 7: Protective zones (implants) - precautionary measures
MW 4x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	3.0 cm
Hearing aid	10 Gs (1.0 mT)	2.5 cm
Timepiece	20 Gs (2.0 mT)	2.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	1.5 cm
Car key	50 Gs (5.0 mT)	1.5 cm
Payment card	400 Gs (40.0 mT)	0.5 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

Extremely neodym field is a real danger to IT equipment and medical implants. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 4x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	31.55 km/h (8.76 m/s)	0.02 J
30 mm	54.65 km/h (15.18 m/s)	0.05 J
50 mm	70.55 km/h (19.60 m/s)	0.09 J
100 mm	99.77 km/h (27.71 m/s)	0.18 J

NdFeB products are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
MW 4x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (P_c)
MW 4x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	760 Mx	7.6 µWb
P_c Coefficient	1.00	High (Stable)

Flux value passing through the magnet pole. Essential parameter for generator designers and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 4x5 / N38

Environment	Effective steel pull	Effect
Air (land)	0.46 kg	Standard
Water (riverbed)	0.53 kg (+0.07 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.

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

1. Shear force

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.00

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 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%

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: 010077-2025

Measurement Calculator

Pulling force

Newtons (N)

Force in lbs

Magnetic Induction

Gauss (Gs)

Simply fill in any input, and the converter calculate everything else automatically.

Other offers

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MW 5x10 / N38 - cylindrical magnet

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This product is an extremely powerful cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø4x5 mm, guarantees optimal power. The MW 4x5 / N38 component features high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.46 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer 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 high power of 4.48 N with a weight of only 0.47 g, this cylindrical magnet is indispensable in electronics 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 immediate cracking of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø4x5), 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 Ø4x5 mm, which, at a weight of 0.47 g, makes it an element with high magnetic energy density. The value of 4.48 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.47 g. The product has a [NiCuNi] coating, which secures it 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 4 mm. 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.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:

They do not lose strength, even during approximately ten years – the decrease in power is only ~1% (according to tests),
They are noted for resistance to demagnetization induced by external field influence,
Thanks to the elegant finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
They show high magnetic induction at the operating surface, which increases their power,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
Thanks to flexibility in constructing and the capacity to adapt to client solutions,
Wide application in modern industrial fields – they find application in HDD drives, electric motors, medical equipment, also technologically advanced constructions.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets and ways of using them

At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 and corrosion.
Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
Due to complex production process, their price is relatively high,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Magnet power was determined for optimal configuration, assuming:

on a plate made of structural steel, optimally conducting the magnetic flux
with a thickness minimum 10 mm
characterized by lack of roughness
without any air gap between the magnet and steel
for force acting at a right angle (pull-off, not shear)
in temp. approx. 20°C

Lifting capacity in real conditions – factors

Real force is influenced by specific conditions, such as (from priority):

Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Warnings

Magnetic interference

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Life threat

People with a ICD must maintain an safe separation from magnets. The magnetism can stop the functioning of the life-saving device.

Magnet fragility

Protect your eyes. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Operating temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Mechanical processing

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Sensitization to coating

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for encased magnets.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Crushing risk

Big blocks can break fingers in a fraction of a second. Do not place your hand between two strong magnets.

Adults only

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

Electronic hazard

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Danger! Need more info? Check our post: Why are neodymium magnets dangerous?

MW 4x5 / N38 - cylindrical magnet

Can't decide what to choose?

MW 4x5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - report

1. Shear force

2. Steel saturation

3. Power loss vs temp

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

Material specification

Environmental data

Pulling force

Magnetic Induction

Other offers

MW 5x10 / N38 - cylindrical magnet

UMC 16x5/2x5 / N38 - cylindrical magnetic holder

MPL 30x15x10 / N38 - lamellar magnet

KM HF - 22 kg - magnetic bracket

Strengths as well as weaknesses of rare earth magnets.

Strengths

Weaknesses

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Lifting capacity in real conditions – factors

Magnetic interference

Life threat

Magnet fragility

Operating temperature

Mechanical processing

Sensitization to coating

Respect the power

Crushing risk

Adults only

Electronic hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C