Product available Ships tomorrow

MW 15x4 / 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: PLN 1-6500
Rating: 5

cylindrical magnet

Catalog no 010030

GTIN/EAN: 5906301810292

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

4.22 kg / 41.38 N

Magnetic Induction

291.60 mT / 2916 Gs

Coating

[NiCuNi] Nickel

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1.968 ZŁ with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Technical of the product - MW 15x4 / N38 - cylindrical magnet

Specification / characteristics - MW 15x4 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010030
GTIN/EAN	5906301810292
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	15 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	5.3 g
Magnetization Direction	↑ axial
Load capacity ~ ?	4.22 kg / 41.38 N
Magnetic Induction ~ ?	291.60 mT / 2916 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x4 / 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 product - technical parameters

Presented information constitute the direct effect of a engineering analysis. Values were calculated on algorithms for the class Nd₂Fe₁₄B. Real-world performance may deviate from the simulation results. Please consider these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - characteristics
MW 15x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2915 Gs 291.5 mT	4.22 kg / 4220.0 g 41.4 N	strong
1 mm	2620 Gs 262.0 mT	3.41 kg / 3408.2 g 33.4 N	strong
2 mm	2276 Gs 227.6 mT	2.57 kg / 2571.6 g 25.2 N	strong
3 mm	1928 Gs 192.8 mT	1.85 kg / 1845.5 g 18.1 N	weak grip
5 mm	1324 Gs 132.4 mT	0.87 kg / 870.3 g 8.5 N	weak grip
10 mm	505 Gs 50.5 mT	0.13 kg / 126.7 g 1.2 N	weak grip
15 mm	222 Gs 22.2 mT	0.02 kg / 24.4 g 0.2 N	weak grip
20 mm	113 Gs 11.3 mT	0.01 kg / 6.3 g 0.1 N	weak grip
30 mm	40 Gs 4.0 mT	0.00 kg / 0.8 g 0.0 N	weak grip
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Pulling power drops sharply with every subsequent millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) strongly weakens the grip. Magnets hold most effectively at the point of direct contact; air break kills the power. Notice how flashily the parameters fall, when the product does not touch directly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Slippage force (wall)
MW 15x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.84 kg / 844.0 g 8.3 N
1 mm	Stal (~0.2)	0.68 kg / 682.0 g 6.7 N
2 mm	Stal (~0.2)	0.51 kg / 514.0 g 5.0 N
3 mm	Stal (~0.2)	0.37 kg / 370.0 g 3.6 N
5 mm	Stal (~0.2)	0.17 kg / 174.0 g 1.7 N
10 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
15 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 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 calculates the estimated weight limit sufficient to cause the downward movement of the magnet downwards along a vertical steel wall (considering standard friction). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 15x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.27 kg / 1266.0 g 12.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.84 kg / 844.0 g 8.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.42 kg / 422.0 g 4.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.11 kg / 2110.0 g 20.7 N

When hanging a element on a upright surface (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that magnets slip faster than they detach. Planning a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slide down under a much lighter weight. Using a rubber pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - power losses
MW 15x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.42 kg / 422.0 g 4.1 N
1 mm	25%	1.06 kg / 1055.0 g 10.3 N
2 mm	50%	2.11 kg / 2110.0 g 20.7 N
5 mm	100%	4.22 kg / 4220.0 g 41.4 N
10 mm	100%	4.22 kg / 4220.0 g 41.4 N

A thin sheet is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the field will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the product works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - resistance threshold
MW 15x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	4.22 kg / 4220.0 g 41.4 N	OK
40 °C	-2.2%	4.13 kg / 4127.2 g 40.5 N	OK
60 °C	-4.4%	4.03 kg / 4034.3 g 39.6 N
80 °C	-6.6%	3.94 kg / 3941.5 g 38.7 N
100 °C	-28.8%	3.00 kg / 3004.6 g 29.5 N

Classic neodymiums lose strength after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this magnet. With increasing heat, the magnet's capacity briefly lowers. Do not use this product near heat sources exceeding its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.

*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 15x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.26 kg / 9258 g 90.8 N 4 518 Gs	N/A
1 mm	8.40 kg / 8404 g 82.4 N 5 555 Gs	7.56 kg / 7564 g 74.2 N ~0 Gs
2 mm	7.48 kg / 7477 g 73.3 N 5 239 Gs	6.73 kg / 6729 g 66.0 N ~0 Gs
3 mm	6.54 kg / 6542 g 64.2 N 4 901 Gs	5.89 kg / 5888 g 57.8 N ~0 Gs
5 mm	4.80 kg / 4804 g 47.1 N 4 200 Gs	4.32 kg / 4324 g 42.4 N ~0 Gs
10 mm	1.91 kg / 1909 g 18.7 N 2 648 Gs	1.72 kg / 1718 g 16.9 N ~0 Gs
20 mm	0.28 kg / 278 g 2.7 N 1 010 Gs	0.25 kg / 250 g 2.5 N ~0 Gs
50 mm	0.00 kg / 4 g 0.0 N 128 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products interact from a wider radius than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Safety (HSE) (implants) - warnings
MW 15x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.5 cm
Hearing aid	10 Gs (1.0 mT)	5.0 cm
Timepiece	20 Gs (2.0 mT)	4.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field poses a serious hazard to IT equipment and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MW 15x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	28.99 km/h (8.05 m/s)	0.17 J
30 mm	49.30 km/h (13.69 m/s)	0.50 J
50 mm	63.63 km/h (17.68 m/s)	0.83 J
100 mm	89.99 km/h (25.00 m/s)	1.66 J

NdFeB products are delicate – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 15x4 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 15x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 659 Mx	56.6 µWb
P_c Coefficient	0.37	Low (Flat)

Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. P_c value defines the magnet's operating point.

Table 11: Submerged application
MW 15x4 / N38

Environment	Effective steel pull	Effect
Air (land)	4.22 kg	Standard
Water (riverbed)	4.83 kg (+0.61 kg Buoyancy gain)	+14.5%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*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) = 0.37

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.

Engineering data and GPSR

Elemental analysis

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: 010030-2025

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This product is an extremely powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø15x4 mm, guarantees optimal power. The MW 15x4 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 4.22 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 41.38 N with a weight of only 5.3 g, this rod is indispensable in miniature devices and wherever every gram matters.

Due to the delicate structure of the ceramic sinter, 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, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø15x4), 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 Ø15x4 mm, which, at a weight of 5.3 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 4.22 kg (force ~41.38 N), which, with such compact 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.

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 15 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.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Strengths

Besides their exceptional strength, neodymium magnets offer the following advantages:

Their strength is durable, and after approximately ten years it decreases only by ~1% (according to research),
Neodymium magnets are characterized by extremely resistant to demagnetization caused by external interference,
In other words, due to the reflective finish of nickel, the element looks attractive,
Magnetic induction on the working layer of the magnet remains exceptional,
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 precise machining as well as adjusting to atypical conditions,
Key role in modern industrial fields – they are utilized in hard drives, brushless drives, diagnostic systems, as well as technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in small systems

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.

At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Limited ability of creating threads in the magnet and complicated shapes - preferred is a housing - magnet mounting.
Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Magnetic strength at its maximum – what affects it?

The force parameter is a result of laboratory testing conducted under the following configuration:

on a base made of mild steel, effectively closing the magnetic field
whose transverse dimension reaches at least 10 mm
with a plane cleaned and smooth
with zero gap (without paint)
for force applied at a right angle (in the magnet axis)
at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

During everyday use, the real power results from many variables, presented from most significant:

Clearance – the presence of any layer (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings

Dust is flammable

Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Danger to the youngest

Adult use only. Small elements can be swallowed, leading to serious injuries. Keep out of reach of children and animals.

Protect data

Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Conscious usage

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Power loss in heat

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Finger safety

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Fragile material

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

Threat to navigation

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Pacemakers

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Security! Details about risks in the article: Safety of working with magnets.

MW 15x4 / N38 - cylindrical magnet

Technical of the product - MW 15x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - technical parameters

Table 1: Static force (force vs distance) - characteristics MW 15x4 / N38

Table 2: Slippage force (wall) MW 15x4 / N38

Table 3: Wall mounting (sliding) - vertical pull MW 15x4 / N38

Table 4: Steel thickness (saturation) - power losses MW 15x4 / N38

Table 5: Thermal resistance (stability) - resistance threshold MW 15x4 / N38

Table 6: Two magnets (attraction) - field range MW 15x4 / N38

Table 7: Safety (HSE) (implants) - warnings MW 15x4 / N38

Table 8: Dynamics (cracking risk) - warning MW 15x4 / N38

Table 9: Anti-corrosion coating durability MW 15x4 / N38

Table 10: Construction data (Flux) MW 15x4 / N38

Table 11: Submerged application MW 15x4 / N38

1. Vertical hold

2. Plate thickness effect

3. Heat tolerance

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

Elemental analysis

Environmental data

Pulling force

Field Strength

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Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Cons

Lifting parameters

Magnetic strength at its maximum – what affects it?

Lifting capacity in practice – influencing factors

Warnings

Dust is flammable

Danger to the youngest

Protect data

Conscious usage

Allergy Warning

Power loss in heat

Finger safety

Fragile material

Threat to navigation

Pacemakers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - characteristics
MW 15x4 / N38

Table 2: Slippage force (wall)
MW 15x4 / N38

Table 3: Wall mounting (sliding) - vertical pull
MW 15x4 / N38

Table 4: Steel thickness (saturation) - power losses
MW 15x4 / N38

Table 5: Thermal resistance (stability) - resistance threshold
MW 15x4 / N38

Table 6: Two magnets (attraction) - field range
MW 15x4 / N38

Table 7: Safety (HSE) (implants) - warnings
MW 15x4 / N38

Table 8: Dynamics (cracking risk) - warning
MW 15x4 / N38

Table 9: Anti-corrosion coating durability
MW 15x4 / N38

Table 10: Construction data (Flux)
MW 15x4 / N38

Table 11: Submerged application
MW 15x4 / N38

Advantages and disadvantages of Nd₂Fe₁₄B magnets.