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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

4.22 kg / 41.38 N

Magnetic Induction

291.60 mT / 2916 Gs

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 ~ ?	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	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 simulation of the product - data

These values constitute the outcome of a mathematical calculation. Values rely on models for the class Nd₂Fe₁₄B. Actual performance may differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull 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	warning
1 mm	2620 Gs 262.0 mT	3.41 kg / 3408.2 g 33.4 N	warning
2 mm	2276 Gs 227.6 mT	2.57 kg / 2571.6 g 25.2 N	warning
3 mm	1928 Gs 192.8 mT	1.85 kg / 1845.5 g 18.1 N	safe
5 mm	1324 Gs 132.4 mT	0.87 kg / 870.3 g 8.5 N	safe
10 mm	505 Gs 50.5 mT	0.13 kg / 126.7 g 1.2 N	safe
15 mm	222 Gs 22.2 mT	0.02 kg / 24.4 g 0.2 N	safe
20 mm	113 Gs 11.3 mT	0.01 kg / 6.3 g 0.1 N	safe
30 mm	40 Gs 4.0 mT	0.00 kg / 0.8 g 0.0 N	safe
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	safe

Pulling power decreases drastically with every subsequent millimeter of spacing. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Neodymiums hold most effectively in perfect adhesion; air break drastically cuts the power. Observe how flashily the pull force drop, when the product does not touch flatly to the metal substrate. When calculating the assembly, avoid additional spacers.

Table 2: Sliding Hold (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

This section defines the theoretical force sufficient to cause the shifting of the magnet downwards on a vertical steel wall (considering typical friction coefficient). This value is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 placing a magnet on a upright surface (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that holders slip easier than they pop off the substrate. Designing a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will give way down under a noticeably lighter load. Utilizing a rubberized coating can effectively 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 metal plate is incapable of take in the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the flux will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation effect means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - 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 irreversibly lose parameters past the thermal threshold. Protect against heat – excessive heat can permanently damage this magnet. As the temperature rises, the neodymium's power momentarily drops. Avoid using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.

*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties under lower heat stress compared to rod magnets. 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 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 attract each other from a much further distance than a neodymium and metal combination. Such a system of two magnets creates a more powerful interaction and a larger range of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).

Table 7: Protective zones (electronics) - 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
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
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a large risk to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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

Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

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)

The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	5 659 Mx	56.6 µWb
Współczynnik Pc	0.37	Niski (Płaski)

Total magnetic flux flowing through the magnet pole. Key data for motor design and Hall effect devices. Pc Factor defines the working geometry.

Table 11: Physics of underwater searching
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%

Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

Quick Unit Converter

Pulling Force

Kilograms (kg)

Force (N)

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Induction (Gs)

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MW 6x1 / N38 - cylindrical magnet

0.221 ZŁ brutto / pcs

The presented product is an extremely powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø15x4 mm, guarantees maximum efficiency. The MW 15x4 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.22 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is ideal for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 41.38 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 recommended way is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating 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 (Ø15x4), 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 15 mm and height 4 mm. The value of 41.38 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.3 g. 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. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:

They do not lose magnetism, even over approximately 10 years – the drop in lifting capacity is only ~1% (based on measurements),
Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
A magnet with a smooth nickel surface has better aesthetics,
Magnetic induction on the surface of the magnet turns out to be extremely intense,
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...
Thanks to versatility in designing and the capacity to adapt to individual projects,
Universal use in electronics industry – they find application in mass storage devices, electromotive mechanisms, medical devices, as well as industrial machines.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets and ways of using them

They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The specified lifting capacity refers to the peak performance, measured under ideal test conditions, specifically:

using a base made of high-permeability steel, serving as a circuit closing element
with a thickness of at least 10 mm
with an ideally smooth touching surface
with total lack of distance (without impurities)
under perpendicular force vector (90-degree angle)
in stable room temperature

Key elements affecting lifting force

Holding efficiency impacted by working environment parameters, including (from priority):

Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Safe handling of NdFeB magnets

Choking Hazard

These products are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Permanent damage

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Powerful field

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and respect their force.

Combustion hazard

Dust generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Threat to navigation

Note: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, device, and GPS.

Warning for heart patients

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Hand protection

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying anything in their path. Be careful!

Electronic devices

Very strong magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Material brittleness

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

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

MW 15x4 / N38 - cylindrical magnet

Hunting for a discount?

MW 15x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the product - data

1. Vertical hold

2. Steel thickness impact

3. Heat tolerance

Pulling Force

Field Strength

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SM 25x100 [2xM8] / N52 - magnetic separator

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

MW 6x1 / N38 - cylindrical magnet

Advantages and disadvantages of rare earth magnets.

Advantages

Weaknesses

Pull force analysis

Maximum holding power of the magnet – what it depends on?

Key elements affecting lifting force

Choking Hazard

Permanent damage

Allergy Warning

Powerful field

Combustion hazard

Threat to navigation

Warning for heart patients

Hand protection

Electronic devices

Material brittleness

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C