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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/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

view parameters »

1.968 ZŁ with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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Technical parameters - 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

Technical analysis of the assembly - report

Presented information constitute the direct effect of a physical analysis. Values rely on models for the material Nd₂Fe₁₄B. Real-world performance may deviate from the simulation results. Treat these data as a reference point for designers.

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

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2915 Gs 291.5 mT	4.22 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	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

Grip strength weakens sharply per each millimeter of spacing. Remember that even a very thin break (e.g., dirt, paint, dust) strongly reduces the pull force. Magnets work most effectively at the point of direct contact; air break nullifies the power. See how quickly the parameters plummet, when the product does not adhere flatly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Vertical load (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 indicates the estimated holding capacity necessary to start the downward movement of the magnet downwards along a upright metal surface (assuming typical friction coefficient). This parameter is relative to the separation distance 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 you can count on just about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient cause that holders slip faster than they detach. Planning a wall mount? Note that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter cargo. Using a rubber layer can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
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 not enough to focus the entire magnetic field, which weakens actual performance of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve 100% of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet works worse. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
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

Ordinary NdFeB products change their properties power past the thermal threshold. Watch out for overheating – high temperature can permanently demagnetize this product. As the temperature rises, the magnet's force temporarily lowers. Refrain from using this magnet near heat sources higher than its safe range. Ignoring the limit will lead to destruction of magnetic properties.

*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) are more susceptible to demagnetization under lower heat stress than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - 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 attract each other from a much further distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a further horizon of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the impact force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density between like poles reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).

Table 7: Safety (HSE) (implants) - precautionary measures
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
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

A strong magnetic field is a serious hazard to electronics and medical implants. These NdFeB products generate a field that disrupts operation of sensitive medical devices. Notice: the unseen radiation acts through matter and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
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 strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (P_c)
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 pole surface. Essential parameter when building generators as well as sensors. P_c value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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!

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Warning: On a vertical wall, the magnet holds just a fraction of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Temperature resistance

*For N38 grade, the safety limit 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

Chemical composition

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%

Ecology and recycling (GPSR)

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

Measurement Calculator

Force (pull)

Force in kg

Newtons (N)

Pounds (lbs)

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Tesla (T)

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MPL 100x40x20 / N38 - lamellar magnet

335.30 ZŁ brutto / pcs

This product is an exceptionally strong rod magnet, made from advanced NdFeB material, which, at dimensions of Ø15x4 mm, guarantees the highest energy density. The MW 15x4 / N38 model boasts an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding 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 Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 41.38 N with a weight of only 5.3 g, this cylindrical magnet 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 long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most frequently chosen standard for industrial 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 key parameter here is the holding force 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 oxidation, 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Besides their immense magnetic power, neodymium magnets offer the following advantages:

They retain magnetic properties for almost 10 years – the loss is just ~1% (in theory),
They retain their magnetic properties even under external field action,
A magnet with a shiny gold surface has better aesthetics,
Magnetic induction on the working part of the magnet turns out to be 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...
Considering the possibility of free shaping and adaptation to custom needs, magnetic components can be manufactured in a variety of shapes and sizes, which expands the range of possible applications,
Wide application in electronics industry – they are used in hard drives, brushless drives, medical equipment, as well as multitasking production systems.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Due to limitations in creating nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics 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

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

The lifting capacity listed is a theoretical maximum value executed under specific, ideal conditions:

with the application of a sheet made of special test steel, ensuring full magnetic saturation
with a cross-section minimum 10 mm
characterized by lack of roughness
under conditions of ideal adhesion (surface-to-surface)
for force applied at a right angle (in the magnet axis)
at standard ambient temperature

Key elements affecting lifting force

Holding efficiency impacted by specific conditions, mainly (from most important):

Air gap (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Metal type – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Threat to electronics

Avoid bringing magnets near a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Bone fractures

Pinching hazard: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, avoid direct skin contact and select encased magnets.

Impact on smartphones

GPS units and smartphones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Risk of cracking

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

Dust explosion hazard

Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Demagnetization risk

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Safe operation

Handle with care. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

Choking Hazard

Absolutely store magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Warning for heart patients

Patients with a ICD must maintain an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.

Warning! Need more info? Read our article: Are neodymium magnets dangerous?

MW 15x4 / N38 - cylindrical magnet

Technical parameters - MW 15x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the assembly - report

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

Table 2: Vertical load (wall) MW 15x4 / N38

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

Table 4: Material efficiency (saturation) - sheet metal selection MW 15x4 / N38

Table 5: Thermal stability (material behavior) - power drop MW 15x4 / N38

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

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

Table 8: Dynamics (kinetic energy) - collision effects MW 15x4 / N38

Table 9: Surface protection spec MW 15x4 / N38

Table 10: Electrical data (Pc) MW 15x4 / N38

Table 11: Underwater work (magnet fishing) MW 15x4 / N38

1. Shear force

2. Steel saturation

3. Temperature resistance

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

Chemical composition

Ecology and recycling (GPSR)

Force (pull)

Field Strength

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MPL 100x40x20 / N38 - lamellar magnet

Advantages as well as disadvantages of neodymium magnets.

Advantages

Cons

Pull force analysis

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

Key elements affecting lifting force

H&S for magnets

Threat to electronics

Bone fractures

Allergy Warning

Impact on smartphones

Risk of cracking

Dust explosion hazard

Demagnetization risk

Safe operation

Choking Hazard

Warning for heart patients

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Vertical load (wall)
MW 15x4 / N38

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

Table 4: Material efficiency (saturation) - sheet metal selection
MW 15x4 / N38

Table 5: Thermal stability (material behavior) - power drop
MW 15x4 / N38

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

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

Table 8: Dynamics (kinetic energy) - collision effects
MW 15x4 / N38

Table 9: Surface protection spec
MW 15x4 / N38

Table 10: Electrical data (P_c)
MW 15x4 / N38

Table 11: Underwater work (magnet fishing)
MW 15x4 / N38