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MW 8x15 / 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 010102

GTIN: 5906301811015

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

5.65 g

Magnetization Direction

↑ axial

Load capacity

3.01 kg / 29.53 N

Magnetic Induction

598.12 mT

Coating

[NiCuNi] Nickel

3.44 ZŁ with VAT / pcs + price for transport

2.80 ZŁ net + 23% VAT / pcs

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MW 8x15 / N38 - cylindrical magnet

Specification / characteristics MW 8x15 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010102
GTIN	5906301811015
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	8 mm [±0,1 mm]
Height	15 mm [±0,1 mm]
Weight	5.65 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.01 kg / 29.53 N
Magnetic Induction ~ ?	598.12 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x15 / 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

Physical analysis of the assembly - data

The following values represent the outcome of a physical analysis. Values rely on algorithms for the material NdFeB. Operational conditions might slightly differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - characteristics
MW 8x15 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5975 Gs 597.5 mT	3.01 kg / 3010.0 g 29.5 N	warning
1 mm	4511 Gs 451.1 mT	1.72 kg / 1715.6 g 16.8 N	low risk
2 mm	3262 Gs 326.2 mT	0.90 kg / 897.3 g 8.8 N	low risk
5 mm	1238 Gs 123.8 mT	0.13 kg / 129.2 g 1.3 N	low risk
10 mm	366 Gs 36.6 mT	0.01 kg / 11.3 g 0.1 N	low risk
15 mm	155 Gs 15.5 mT	0.00 kg / 2.0 g 0.0 N	low risk
20 mm	80 Gs 8.0 mT	0.00 kg / 0.5 g 0.0 N	low risk
30 mm	30 Gs 3.0 mT	0.00 kg / 0.1 g 0.0 N	low risk
50 mm	8 Gs 0.8 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power weakens drastically with every mm of gap. Remember that even a microscopic distance (e.g., contamination, paint, veneer) noticeably weakens the grip. Magnetic products operate strongest in perfect adhesion; gap nullifies the force. See how quickly the load capacity drop, when the magnet does not touch flatly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Vertical assembly (shearing) - vertical pull
MW 8x15 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.90 kg / 903.0 g 8.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.60 kg / 602.0 g 5.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.30 kg / 301.0 g 3.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.51 kg / 1505.0 g 14.8 N

When placing a magnet on a vertical plane (e.g., a board), it you can count on barely about 1/5 of nominal attraction strength. Gravity and a weak degree of grip cause that holders move down easier than they pull off. Designing a vertical fastening? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a much lighter weight. Application of an anti-slip layer can significantly increase the grip.

Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 8x15 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.30 kg / 301.0 g 3.0 N
1 mm	25%	0.75 kg / 752.5 g 7.4 N
2 mm	50%	1.51 kg / 1505.0 g 14.8 N
5 mm	100%	3.01 kg / 3010.0 g 29.5 N
10 mm	100%	3.01 kg / 3010.0 g 29.5 N

A thin metal plate cannot conduct the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the field will pass right through and the holding will be smaller. To achieve the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 4: Thermal resistance (material behavior) - thermal limit
MW 8x15 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	3.01 kg / 3010.0 g 29.5 N	OK
40 °C	-2.2%	2.94 kg / 2943.8 g 28.9 N	OK
60 °C	-4.4%	2.88 kg / 2877.6 g 28.2 N	OK
80 °C	-6.6%	2.81 kg / 2811.3 g 27.6 N
100 °C	-28.8%	2.14 kg / 2143.1 g 21.0 N

Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this magnet. With every degree above norm, the neodymium's power temporarily decreases. Avoid using this product near heat sources exceeding its working range. Ignoring the limit will result in irreversible degradation of magnetic properties.

Table 5: Two magnets (attraction) - field collision
MW 8x15 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.52 kg / 4515.0 g 44.3 N	N/A
2 mm	1.35 kg / 1350.0 g 13.2 N	1.26 kg / 1260.0 g 12.4 N
5 mm	0.20 kg / 195.0 g 1.9 N	0.18 kg / 182.0 g 1.8 N
10 mm	0.02 kg / 15.0 g 0.1 N	0.01 kg / 14.0 g 0.1 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

Two magnets interact from a much further distance than a neodymium and metal combination. The setup of two magnets creates a more powerful interaction and a further horizon of action. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still large.

Table 6: Safety (HSE) (implants) - warnings
MW 8x15 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.0 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
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field is a real danger to IT equipment and pacemakers. These neodymiums generate a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 7: Impact energy (cracking risk) - warning
MW 8x15 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	23.33 km/h (6.48 m/s)	0.12 J
30 mm	40.32 km/h (11.20 m/s)	0.35 J
50 mm	52.05 km/h (14.46 m/s)	0.59 J
100 mm	73.61 km/h (20.45 m/s)	1.18 J

Neodymium magnets are delicate – a collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or painful pinches to skin. Hold the magnet firmly 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. Wear eye protection when working with large magnets.

Table 8: Corrosion resistance
MW 8x15 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 9: Underwater work (magnet fishing)
MW 8x15 / N38

Environment	Effective steel pull	Effect
Air (land)	3.01 kg	Standard
Water (riverbed)	3.45 kg (+0.44 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!

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

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The offered product is an incredibly powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø8x15 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 3.01 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 29.53 N with a weight of only 5.65 g, this rod is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure long-term durability 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 modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

This model is characterized by dimensions Ø8x15 mm, which, at a weight of 5.65 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 3.01 kg (force ~29.53 N), which, with such defined 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 8 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 and disadvantages of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
Neodymium magnets are distinguished by extremely resistant to demagnetization caused by magnetic disturbances,
In other words, due to the aesthetic finish of gold, the element looks attractive,
Neodymium magnets achieve maximum magnetic induction on a small area, which allows for strong attraction,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
Thanks to versatility in constructing and the capacity to adapt to unusual requirements,
Key role in modern technologies – they are commonly used in hard drives, motor assemblies, precision medical tools, as well as multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Problematic aspects of neodymium magnets: weaknesses and usage proposals

They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
Due to limitations in producing nuts and complicated shapes in magnets, we propose using casing - magnetic holder.
Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance 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.
With budget limitations the cost of neodymium magnets is economically unviable,

Highest magnetic holding force – what contributes to it?

Information about lifting capacity was defined for the most favorable conditions, taking into account:

with the use of a yoke made of special test steel, ensuring maximum field concentration
possessing a massiveness of minimum 10 mm to avoid saturation
characterized by even structure
without the slightest air gap between the magnet and steel
under axial application of breakaway force (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In practice, the actual holding force results from a number of factors, listed from most significant:

Air gap (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets

Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them cracking into shards.

Immense force

Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and do not underestimate their force.

Medical interference

People with a pacemaker have to maintain an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.

Heat sensitivity

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

Crushing force

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Avoid contact if allergic

Certain individuals experience a contact allergy to nickel, which is the common plating for neodymium magnets. Extended handling can result in a rash. We strongly advise use safety gloves.

Magnetic interference

A powerful magnetic field negatively affects the functioning of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to prevent breaking the sensors.

Electronic hazard

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.

Do not give to children

Product intended for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store away from kids and pets.

Flammability

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Caution!

Looking for details? Read our article: Why are neodymium magnets dangerous?

MW 8x15 / N38 - cylindrical magnet

MW 8x15 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the assembly - data

Other products

MW 9x3 / N38 - cylindrical magnet

MPL 40x20x10 / N38 - lamellar magnet

MPL 5x4x1 / N38 - lamellar magnet

MPL 50x20x5 / N38 - lamellar magnet

Advantages and disadvantages of NdFeB magnets.

Highest magnetic holding force – what contributes to it?

Magnet lifting force in use – key factors

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C