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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: 1-6500
Rating: 5

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

4.12 kg / 40.39 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 ~ ?	4.12 kg / 40.39 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

Engineering modeling of the assembly - data

Presented information represent the direct effect of a physical analysis. Values rely on algorithms for the material NdFeB. Real-world performance may differ. Treat these calculations as a reference point for designers.

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

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2915 Gs 291.5 mT	4.12 kg / 4120.0 g 40.4 N	warning
1 mm	2620 Gs 262.0 mT	3.33 kg / 3327.5 g 32.6 N	warning
2 mm	2276 Gs 227.6 mT	2.51 kg / 2510.7 g 24.6 N	warning
5 mm	1324 Gs 132.4 mT	0.85 kg / 849.7 g 8.3 N	low risk
10 mm	505 Gs 50.5 mT	0.12 kg / 123.7 g 1.2 N	low risk
15 mm	222 Gs 22.2 mT	0.02 kg / 23.8 g 0.2 N	low risk
20 mm	113 Gs 11.3 mT	0.01 kg / 6.1 g 0.1 N	low risk
30 mm	40 Gs 4.0 mT	0.00 kg / 0.8 g 0.0 N	low risk
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	low risk

Magnetic force decreases significantly with every mm of gap. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnets operate strongest in perfect adhesion; distance kills the force. Analyze how quickly the load capacity drop, when the product does not adhere flatly to the steel surface. When calculating the mounting, eliminate additional spacers.

Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 15x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.24 kg / 1236.0 g 12.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.82 kg / 824.0 g 8.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.41 kg / 412.0 g 4.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.06 kg / 2060.0 g 20.2 N

When placing a holder on a upright wall (e.g., a car body), it will only hold just approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that holders slide down faster than they detach. Designing a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will slide down under a noticeably lighter cargo. Application of an anti-slip coating can effectively improve the result.

Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 15x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.41 kg / 412.0 g 4.0 N
1 mm	25%	1.03 kg / 1030.0 g 10.1 N
2 mm	50%	2.06 kg / 2060.0 g 20.2 N
5 mm	100%	4.12 kg / 4120.0 g 40.4 N
10 mm	100%	4.12 kg / 4120.0 g 40.4 N

A too thin steel is not enough to take in the full magnetic flux, which weakens actual performance of the magnet. Should you install a neodymium to a thin surface, the field will pass right through and the holding will be smaller. To squeeze 100% of this neodymium's potential, you need a suitably thick piece of metal. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 4: Thermal stability (stability) - thermal limit
MW 15x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	4.12 kg / 4120.0 g 40.4 N	OK
40 °C	-2.2%	4.03 kg / 4029.4 g 39.5 N	OK
60 °C	-4.4%	3.94 kg / 3938.7 g 38.6 N	OK
80 °C	-6.6%	3.85 kg / 3848.1 g 37.7 N
100 °C	-28.8%	2.93 kg / 2933.4 g 28.8 N

Ordinary NdFeB products change their properties parameters above the temperature limit. Watch out for overheating – high temperature can irreversibly destroy this magnet. With increasing heat, the magnet's capacity momentarily drops. Refrain from using this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetic properties.

Table 5: Magnet-Magnet interaction (repulsion) - field range
MW 15x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	6.18 kg / 6180.0 g 60.6 N	N/A
2 mm	3.76 kg / 3765.0 g 36.9 N	3.51 kg / 3514.0 g 34.5 N
5 mm	1.28 kg / 1275.0 g 12.5 N	1.19 kg / 1190.0 g 11.7 N
10 mm	0.18 kg / 180.0 g 1.8 N	0.17 kg / 168.0 g 1.6 N
20 mm	0.02 kg / 15.0 g 0.1 N	0.01 kg / 14.0 g 0.1 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnets interact from a much further distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a wider radius of operation. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the connection force, but still significant.

Table 6: 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
Timepiece	20 Gs (2.0 mT)	4.0 cm
Mobile device	40 Gs (4.0 mT)	3.0 cm
Remote	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 serious hazard to electronics as well as pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 7: Impact energy (cracking risk) - collision effects
MW 15x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	28.64 km/h (7.96 m/s)	0.17 J
30 mm	48.71 km/h (13.53 m/s)	0.49 J
50 mm	62.88 km/h (17.47 m/s)	0.81 J
100 mm	88.92 km/h (24.70 m/s)	1.62 J

NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can cause material chips or painful pinches to skin. Always hold the magnet during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when working with powerful specimens.

Table 8: Coating parameters (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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 9: Physics of underwater searching
MW 15x4 / N38

Environment	Effective steel pull	Effect
Air (land)	4.12 kg	Standard
Water (riverbed)	4.72 kg (+0.60 kg Buoyancy gain)	+14.5%

Warning: 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. Buoyancy helps in lifting finds.

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MPL 20x3x2 / N38 - lamellar magnet

0.394 ZŁ brutto / pcs

This product is a very strong cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø15x4 mm, guarantees optimal power. The MW 15x4 / N38 model boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 4.12 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 40.39 N with a weight of only 5.3 g, this rod is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional 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.

Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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.

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 4.12 kg (force ~40.39 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.

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 neodymium magnets.

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

Their power is maintained, and after around 10 years it decreases only by ~1% (theoretically),
They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
Thanks to the shiny finish, the plating of nickel, gold, or silver-plated gives an modern appearance,
Magnets have maximum magnetic induction on the active area,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
Possibility of precise shaping and adapting to individual requirements,
Versatile presence in innovative solutions – they find application in magnetic memories, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
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 and corrosion.
Due to limitations in creating nuts and complex shapes in magnets, we propose using cover - magnetic holder.
Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

The specified lifting capacity represents the limit force, measured under optimal environment, specifically:

on a block made of mild steel, effectively closing the magnetic flux
with a thickness of at least 10 mm
with an ground touching surface
under conditions of no distance (surface-to-surface)
under perpendicular force direction (90-degree angle)
at standard ambient temperature

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, such as (from most important):

Distance (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.

Warnings

Sensitization to coating

Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for encased magnets.

Threat to electronics

Data protection: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Heat warning

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Compass and GPS

A powerful magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Fire warning

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Bone fractures

Risk of injury: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Immense force

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Danger to the youngest

Absolutely keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Fragile material

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Attention!

More info about hazards in the article: Magnet Safety Guide.

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

Engineering modeling of the assembly - data

Other products

SM 25x400 [2xM8] / N52 - magnetic separator

MPL 45x25x10 / N38 - lamellar magnet

SM 25x175 [2xM8] / N42 - magnetic separator

MPL 20x3x2 / N38 - lamellar magnet

Strengths and weaknesses of neodymium magnets.

Maximum holding power of the magnet – what affects it?

Determinants of lifting force in real conditions

Warnings

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C