Nazwa: MW 15x4 / N38
Kategoria ID: 1
Wymiary znalezione w atrybutach:
D: 15, H: 4, Do: 0, Di: 0

Nazwa: MW 15x4 / N38
Kategoria ID: 1
Wymiary znalezione w atrybutach:
D: 15, H: 4, Do: 0, Di: 0

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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN: 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

3.16 kg / 30.99 N

Magnetic Induction

291.60 mT

Coating

[NiCuNi] Nickel

1.968 ZŁ with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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MW 15x4 / N38 - cylindrical magnet

Specification / characteristics MW 15x4 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010030
GTIN	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 ~ ?	3.16 kg / 30.99 N
Magnetic Induction ~ ?	291.60 mT
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	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

Magnet Performance Analysis

Results are based on physical models for sintered magnets. Real-world results may differ from the simulation.

Table 1: Pull Force vs Distance Function
MW 15x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2915 Gs 291.5 mT	2.85 kg / 2846.4 g 27.9 N	Medium
1 mm	2620 Gs 262.0 mT	2.30 kg / 2298.9 g 22.6 N	Medium
2 mm	2276 Gs 227.6 mT	1.73 kg / 1734.6 g 17.0 N	Safe
5 mm	1324 Gs 132.4 mT	0.59 kg / 587.0 g 5.8 N	Safe
10 mm	505 Gs 50.5 mT	0.09 kg / 85.5 g 0.8 N	Safe
15 mm	222 Gs 22.2 mT	0.02 kg / 16.4 g 0.2 N	Safe
20 mm	113 Gs 11.3 mT	0.00 kg / 4.2 g 0.0 N	Safe
30 mm	40 Gs 4.0 mT	0.00 kg / 0.5 g 0.0 N	Safe
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	Safe

Magnetic force drops drastically with every millimeter of distance. Air gap is the biggest enemy of holding force in technical applications.

Table 2: Shear Force (Wall Mount)
MW 15x4 / N38

Surface Type	Friction Coeff. / % Mocy	Max Load (kg)
Raw Steel	µ = 0.3 30% Nominalnej Siły	0.85 kg / 853.9 g 8.4 N
Painted Steel (Standard)	µ = 0.2 20% Nominalnej Siły	0.57 kg / 569.3 g 5.6 N
Greasy/Slippery Steel	µ = 0.1 10% Nominalnej Siły	0.28 kg / 284.6 g 2.8 N
Magnet with Anti-slip Rubber	µ = 0.5 50% Nominalnej Siły	1.42 kg / 1423.2 g 14.0 N

Friction force is key here; standard holding force applies only to perpendicular detachment. For vertical mounting, we recommend assuming a safety margin of x5.

Table 3: Power Loss on Thin Sheets
MW 15x4 / N38

Steel Thickness (mm)	% Efficiency	Real Pull Force (kg)
0.5 mm	10%	0.28 kg / 284.6 g 2.8 N
1 mm	25%	0.71 kg / 711.6 g 7.0 N
2 mm	50%	1.42 kg / 1423.2 g 14.0 N
5 mm	100%	2.85 kg / 2846.4 g 27.9 N
10 mm	100%	2.85 kg / 2846.4 g 27.9 N

Too thin substrate acts as a bottleneck for the magnetic flux. We recommend selecting the sheet thickness according to the table below.

Table 4: Thermal Stability of the Magnet
MW 15x4 / N38

Ambient Temp. (°C)	Power Loss	Remaining Pull	Status
20 °C	0.0%	2.85 kg / 2846.4 g 27.9 N	OK
40 °C	-2.2%	2.78 kg / 2783.8 g 27.3 N	OK
60 °C	-4.4%	2.72 kg / 2721.2 g 26.7 N	OK
80 °C	-6.6%	2.66 kg / 2658.6 g 26.1 N
100 °C	-28.8%	2.03 kg / 2026.7 g 19.9 N

The temperature coefficient for neodymium is negative, meaning power loss in heat. Specialized high-temperature magnets are required for work in ovens or engines.

Table 5: Magnetic Coupling (N-S and N-N)
MW 15x4 / N38

Air Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.28 kg / 4275.0 g 41.9 N	N/A
2 mm	2.59 kg / 2595.0 g 25.5 N	2.42 kg / 2422.0 g 23.8 N
5 mm	0.89 kg / 885.0 g 8.7 N	0.83 kg / 826.0 g 8.1 N
10 mm	0.14 kg / 135.0 g 1.3 N	0.13 kg / 126.0 g 1.2 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

The effective attraction range doubles when there is also a magnet on the other side. Use non-magnetic tools when manipulating a pair of magnets.

Table 6: Device & Health Protection
MW 15x4 / N38

Object / Device	Limit (Gauss) / mT	Safe Distance
Pacemaker	5 Gs (0.5 mT)	6.5 cm
Hearing Aid / Implant	10 Gs (1.0 mT)	5.0 cm
Mechanical Watch	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
Credit Card	400 Gs (40.0 mT)	1.5 cm
Hard Drive (HDD)	600 Gs (60.0 mT)	1.0 cm

Strong magnetic field poses a serious threat to electronics and medical implants. Bringing a magnet close to a cochlear implant can cause pain, noise, and permanent damage. Even brief contact can demagnetize credit card strips, tickets, or the immobilizer in a key.

Table 7: Speed and Kinetic Energy
MW 15x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	23.80 km/h (6.61 m/s)	0.12 J
30 mm	40.48 km/h (11.24 m/s)	0.34 J
50 mm	52.25 km/h (14.52 m/s)	0.56 J
100 mm	73.90 km/h (20.53 m/s)	1.12 J

Nickel coating may chip off upon strong mechanical impact. Watch your fingers – kinetic energy concentrates on a small area.

Table 8: Surface Protection Specs
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, Epoxy coating is required; standard Nickel is for indoor use only. Pay attention to the protective layer thickness.

Table 9: Physics of Underwater Search
MW 15x4 / N38

Environment	Effective Steel Capacity	Effect
Air (Land)	2.85 kg	Standard
Water (River bed)	3.26 kg (+0.41 kg Buoyancy Bonus)	+14.5%

Corrosion Warning: This magnet has a standard Nickel coating. After use in water, dry it immediately and preserve it, otherwise it will rust!

Magnetic field passes through water with zero loss. Thanks to this, your magnet will pull a heavier object from the bottom than it would hold in the air.

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This product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø15x4 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 3.16 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring 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 pull force of 30.99 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using two-component epoxy glues. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating 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 (Ø15x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 3.16 kg (force ~30.99 N), which, with such defined 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.

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 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 NdFeB magnets.

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

Their strength remains stable, and after around 10 years it decreases only by ~1% (theoretically),
They are noted for resistance to demagnetization induced by presence of other magnetic fields,
A magnet with a metallic nickel surface is more attractive,
They show high magnetic induction at the operating surface, which improves attraction properties,
Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
Thanks to the option of free molding and adaptation to specialized requirements, neodymium magnets can be created in a wide range of geometric configurations, which makes them more universal,
Key role in modern industrial fields – they serve a role in hard drives, electric drive systems, medical devices, and complex engineering applications.
Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Limited possibility of making nuts in the magnet and complicated shapes - preferred is a housing - magnet mounting.
Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
Due to complex production process, their price exceeds standard values,

Maximum lifting capacity of the magnet – what contributes to it?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:

on a plate made of mild steel, perfectly concentrating the magnetic flux
possessing a massiveness of min. 10 mm to ensure full flux closure
with an polished contact surface
with zero gap (without paint)
for force acting at a right angle (pull-off, not shear)
at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

In practice, the real power results from many variables, ranked from the most important:

Distance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to pulling vertically. When applying parallel force, 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 lifting capacity (the magnet "punches through" it).
Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
Surface finish – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize 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 load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets

Do not drill into magnets

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.

Protective goggles

Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them breaking into small pieces.

Electronic hazard

Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Metal Allergy

Certain individuals suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Extended handling may cause skin redness. We strongly advise use safety gloves.

GPS and phone interference

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Handling rules

Handle magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and respect their power.

Life threat

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to work with the magnets.

Product not for children

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are tragic.

Pinching danger

Pinching hazard: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Demagnetization risk

Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Safety First!

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

MW 15x4 / N38 - cylindrical magnet

MW 15x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Magnet Performance Analysis

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MPL 20x20x20 / N38 - lamellar magnet

Advantages as well as disadvantages of NdFeB magnets.

Maximum lifting capacity of the magnet – what contributes to it?

Lifting capacity in real conditions – factors

Precautions when working with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C