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MW 8x8 / 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 010106

GTIN/EAN: 5906301811053

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

3.02 g

Magnetization Direction

↑ axial

Load capacity

2.03 kg / 19.92 N

Magnetic Induction

553.67 mT / 5537 Gs

Coating

[NiCuNi] Nickel

see properties »

1.341 ZŁ with VAT / pcs + price for transport

1.090 ZŁ net + 23% VAT / pcs

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Technical details - MW 8x8 / N38 - cylindrical magnet

Specification / characteristics - MW 8x8 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010106
GTIN/EAN	5906301811053
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	8 mm [±0,1 mm]
Weight	3.02 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.03 kg / 19.92 N
Magnetic Induction ~ ?	553.67 mT / 5537 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x8 / 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 product - data

Presented information constitute the result of a mathematical analysis. Values were calculated on models for the class Nd₂Fe₁₄B. Actual performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MW 8x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5531 Gs 553.1 mT	2.03 kg / 2030.0 g 19.9 N	medium risk
1 mm	4162 Gs 416.2 mT	1.15 kg / 1149.3 g 11.3 N	safe
2 mm	2984 Gs 298.4 mT	0.59 kg / 590.7 g 5.8 N	safe
3 mm	2107 Gs 210.7 mT	0.29 kg / 294.5 g 2.9 N	safe
5 mm	1084 Gs 108.4 mT	0.08 kg / 78.0 g 0.8 N	safe
10 mm	296 Gs 29.6 mT	0.01 kg / 5.8 g 0.1 N	safe
15 mm	118 Gs 11.8 mT	0.00 kg / 0.9 g 0.0 N	safe
20 mm	58 Gs 5.8 mT	0.00 kg / 0.2 g 0.0 N	safe
30 mm	20 Gs 2.0 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	safe

Grip strength weakens significantly with every mm of distance. Keep in mind that every additional insulation layer (e.g., dirt, paint, rust) noticeably diminishes the holding power. Magnets work most effectively in perfect adhesion; gap weakens the power. Notice how rapidly the pull force drop, when the magnet does not touch tightly to the metal substrate. When planning the mounting, eliminate unnecessary gaps.

Table 2: Vertical hold (vertical surface)
MW 8x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.41 kg / 406.0 g 4.0 N
1 mm	Stal (~0.2)	0.23 kg / 230.0 g 2.3 N
2 mm	Stal (~0.2)	0.12 kg / 118.0 g 1.2 N
3 mm	Stal (~0.2)	0.06 kg / 58.0 g 0.6 N
5 mm	Stal (~0.2)	0.02 kg / 16.0 g 0.2 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 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 calculates the estimated holding capacity necessary to start the sliding of the magnet downwards along a vertical steel wall (considering standard friction). This value is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.61 kg / 609.0 g 6.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.41 kg / 406.0 g 4.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.20 kg / 203.0 g 2.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.02 kg / 1015.0 g 10.0 N

When mounting a magnet on a upright plane (e.g., a fridge), it will only hold just approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that magnets move down faster than they pull off. Want to create a wall mount? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller load. Application of an anti-slip layer can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x8 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.20 kg / 203.0 g 2.0 N
1 mm	25%	0.51 kg / 507.5 g 5.0 N
2 mm	50%	1.02 kg / 1015.0 g 10.0 N
5 mm	100%	2.03 kg / 2030.0 g 19.9 N
10 mm	100%	2.03 kg / 2030.0 g 19.9 N

A thin sheet is not enough to conduct the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the field will pass right through and the holding will be smaller. To utilize full efficiency of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the product works worse. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - power drop
MW 8x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	2.03 kg / 2030.0 g 19.9 N	OK
40 °C	-2.2%	1.99 kg / 1985.3 g 19.5 N	OK
60 °C	-4.4%	1.94 kg / 1940.7 g 19.0 N	OK
80 °C	-6.6%	1.90 kg / 1896.0 g 18.6 N
100 °C	-28.8%	1.45 kg / 1445.4 g 14.2 N

Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the magnet's capacity momentarily decreases. Refrain from using this magnet close to ovens higher than its working range. Too high temperature will cause irreversible degradation of magnetic properties.

*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 8x8 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.48 kg / 9481 g 93.0 N 6 000 Gs	N/A
1 mm	7.26 kg / 7262 g 71.2 N 9 682 Gs	6.54 kg / 6536 g 64.1 N ~0 Gs
2 mm	5.37 kg / 5368 g 52.7 N 8 324 Gs	4.83 kg / 4831 g 47.4 N ~0 Gs
3 mm	3.88 kg / 3877 g 38.0 N 7 074 Gs	3.49 kg / 3489 g 34.2 N ~0 Gs
5 mm	1.95 kg / 1949 g 19.1 N 5 016 Gs	1.75 kg / 1754 g 17.2 N ~0 Gs
10 mm	0.36 kg / 364 g 3.6 N 2 169 Gs	0.33 kg / 328 g 3.2 N ~0 Gs
20 mm	0.03 kg / 27 g 0.3 N 592 Gs	0.02 kg / 24 g 0.2 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 66 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the attraction, but still impressive.
*Field value for N-N configuration reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 8x8 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.5 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Mechanical watch	20 Gs (2.0 mT)	3.5 cm
Mobile device	40 Gs (4.0 mT)	2.5 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

Powerful magnet radiation is a real danger to electronics as well as medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 8x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	26.19 km/h (7.28 m/s)	0.08 J
30 mm	45.29 km/h (12.58 m/s)	0.24 J
50 mm	58.47 km/h (16.24 m/s)	0.40 J
100 mm	82.68 km/h (22.97 m/s)	0.80 J

Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Surface protection spec
MW 8x8 / 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, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 8x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 868 Mx	28.7 µWb
P_c Coefficient	0.89	High (Stable)

Flux value emitted by the pole surface. Essential parameter for generator designers and motors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MW 8x8 / N38

Environment	Effective steel pull	Effect
Air (land)	2.03 kg	Standard
Water (riverbed)	2.32 kg (+0.29 kg Buoyancy gain)	+14.5%

Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. 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 surface, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.89

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.

Technical and environmental data

Material specification

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%

Environmental data

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: 010106-2025

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1193.10 ZŁ brutto / pcs

This product is an extremely powerful cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø8x8 mm, guarantees the highest energy density. The MW 8x8 / N38 model boasts an accuracy of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.03 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer 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 electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 19.92 N with a weight of only 3.02 g, this rod is indispensable in electronics and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure long-term durability 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 modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø8x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.

This model is characterized by dimensions Ø8x8 mm, which, at a weight of 3.02 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 2.03 kg (force ~19.92 N), which, with such compact dimensions, proves the high power 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 8 mm. Such an arrangement is most desirable 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.

Pros and cons of Nd₂Fe₁₄B magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:

They retain attractive force for almost ten years – the drop is just ~1% (based on simulations),
Neodymium magnets remain extremely resistant to loss of magnetic properties caused by magnetic disturbances,
A magnet with a shiny silver surface looks better,
They show high magnetic induction at the operating surface, which improves attraction properties,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
Thanks to versatility in forming and the capacity to modify to client solutions,
Fundamental importance in future technologies – they are commonly used in computer drives, brushless drives, medical devices, also technologically advanced constructions.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:

At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
Limited possibility of creating nuts in the magnet and complex shapes - recommended is cover - mounting mechanism.
Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet power is the result of a measurement for ideal contact conditions, including:

with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
whose transverse dimension reaches at least 10 mm
characterized by lack of roughness
with total lack of distance (without paint)
during detachment in a direction vertical to the plane
at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

During everyday use, the real power results from several key aspects, listed from most significant:

Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Base massiveness – too thin sheet does not accept the full field, causing part of the power to be escaped to the other side.
Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.

Precautions when working with NdFeB magnets

Magnetic media

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

Choking Hazard

NdFeB magnets are not toys. Eating multiple magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Skin irritation risks

Certain individuals experience a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact might lead to a rash. We suggest use safety gloves.

Fire risk

Powder produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Do not overheat magnets

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Handling rules

Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their force.

Eye protection

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Eye protection is mandatory.

GPS Danger

Remember: rare earth magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.

Life threat

Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Physical harm

Big blocks can smash fingers instantly. Never put your hand betwixt two strong magnets.

Attention! Learn more about risks in the article: Safety of working with magnets.

MW 8x8 / N38 - cylindrical magnet

Technical details - MW 8x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the product - data

Table 1: Static force (pull vs gap) - characteristics MW 8x8 / N38

Table 2: Vertical hold (vertical surface) MW 8x8 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 8x8 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MW 8x8 / N38

Table 5: Thermal stability (stability) - power drop MW 8x8 / N38

Table 6: Two magnets (repulsion) - forces in the system MW 8x8 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures MW 8x8 / N38

Table 8: Impact energy (cracking risk) - warning MW 8x8 / N38

Table 9: Surface protection spec MW 8x8 / N38

Table 10: Construction data (Flux) MW 8x8 / N38

Table 11: Submerged application MW 8x8 / N38

1. Shear force

2. Steel saturation

3. Temperature resistance

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

Material specification

Environmental data

Magnet pull force

Magnetic Induction

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MW 15x4 / N38 - cylindrical magnet

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MPL 50x30x4 / N38 - lamellar magnet

SM 32x375 [2xM8] / N52 - magnetic separator

Pros and cons of Nd2Fe14B magnets.

Pros

Cons

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

What influences lifting capacity in practice

Precautions when working with NdFeB magnets

Magnetic media

Choking Hazard

Skin irritation risks

Fire risk

Do not overheat magnets

Handling rules

Eye protection

GPS Danger

Life threat

Physical harm

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs gap) - characteristics
MW 8x8 / N38

Table 2: Vertical hold (vertical surface)
MW 8x8 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x8 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x8 / N38

Table 5: Thermal stability (stability) - power drop
MW 8x8 / N38

Table 6: Two magnets (repulsion) - forces in the system
MW 8x8 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 8x8 / N38

Table 8: Impact energy (cracking risk) - warning
MW 8x8 / N38

Table 9: Surface protection spec
MW 8x8 / N38

Table 10: Construction data (Flux)
MW 8x8 / N38

Table 11: Submerged application
MW 8x8 / N38

Pros and cons of Nd₂Fe₁₄B magnets.