Product available Ships tomorrow

MW 8x5 / 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 010105

GTIN/EAN: 5906301811046

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

1.88 g

Magnetization Direction

↑ axial

Load capacity

2.17 kg / 21.31 N

Magnetic Induction

483.41 mT / 4834 Gs

Coating

[NiCuNi] Nickel

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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MW 8x5 / N38 - cylindrical magnet

Specification / characteristics MW 8x5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010105
GTIN/EAN	5906301811046
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	5 mm [±0,1 mm]
Weight	1.88 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.17 kg / 21.31 N
Magnetic Induction ~ ?	483.41 mT / 4834 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x5 / 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 modeling of the magnet - data

These data represent the outcome of a physical calculation. Values rely on models for the material Nd₂Fe₁₄B. Real-world parameters might slightly differ from theoretical values. Use these data as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MW 8x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4830 Gs 483.0 mT	2.17 kg / 2170.0 g 21.3 N	medium risk
1 mm	3655 Gs 365.5 mT	1.24 kg / 1242.8 g 12.2 N	safe
2 mm	2610 Gs 261.0 mT	0.63 kg / 633.9 g 6.2 N	safe
3 mm	1825 Gs 182.5 mT	0.31 kg / 310.0 g 3.0 N	safe
5 mm	915 Gs 91.5 mT	0.08 kg / 77.9 g 0.8 N	safe
10 mm	234 Gs 23.4 mT	0.01 kg / 5.1 g 0.1 N	safe
15 mm	89 Gs 8.9 mT	0.00 kg / 0.7 g 0.0 N	safe
20 mm	43 Gs 4.3 mT	0.00 kg / 0.2 g 0.0 N	safe
30 mm	14 Gs 1.4 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	3 Gs 0.3 mT	0.00 kg / 0.0 g 0.0 N	safe

Pulling power decreases sharply with every subsequent millimeter of distance. Remember that even the smallest gap (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Magnetic products work most effectively at the point of direct contact; air break kills the force. Observe how quickly the pull force drop, when the magnet does not adhere tightly to the steel surface. When calculating the assembly, discard redundant distances.

Table 2: Vertical Force (Vertical Surface)
MW 8x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.43 kg / 434.0 g 4.3 N
1 mm	Stal (~0.2)	0.25 kg / 248.0 g 2.4 N
2 mm	Stal (~0.2)	0.13 kg / 126.0 g 1.2 N
3 mm	Stal (~0.2)	0.06 kg / 62.0 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

The following data presents the approximate shear load required to initiate the shifting of the magnet down along a vertical steel plate (assuming standard friction). This parameter is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 8x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.65 kg / 651.0 g 6.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.43 kg / 434.0 g 4.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.22 kg / 217.0 g 2.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.09 kg / 1085.0 g 10.6 N

When placing a magnet on a upright wall (e.g., a car body), it will maintain just approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that holders slip faster than they detach. Designing a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a much lighter weight. Using a rubber layer can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 8x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.22 kg / 217.0 g 2.1 N
1 mm	25%	0.54 kg / 542.5 g 5.3 N
2 mm	50%	1.09 kg / 1085.0 g 10.6 N
5 mm	100%	2.17 kg / 2170.0 g 21.3 N
10 mm	100%	2.17 kg / 2170.0 g 21.3 N

A thin metal plate is not enough to take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a thin surface, the field will pass right through and the holding will be smaller. To squeeze 100% of this neodymium's power, you need a suitably thick piece of steel. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 8x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	2.17 kg / 2170.0 g 21.3 N	OK
40 °C	-2.2%	2.12 kg / 2122.3 g 20.8 N	OK
60 °C	-4.4%	2.07 kg / 2074.5 g 20.4 N	OK
80 °C	-6.6%	2.03 kg / 2026.8 g 19.9 N
100 °C	-28.8%	1.55 kg / 1545.0 g 15.2 N

Ordinary NdFeB products irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly destroy this product. As the temperature rises, the magnet's force temporarily drops. Avoid using this magnet in hot environments higher than its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.

*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 8x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	7.23 kg / 7228 g 70.9 N 5 742 Gs	N/A
1 mm	5.58 kg / 5585 g 54.8 N 8 490 Gs	5.03 kg / 5026 g 49.3 N ~0 Gs
2 mm	4.14 kg / 4140 g 40.6 N 7 310 Gs	3.73 kg / 3726 g 36.6 N ~0 Gs
3 mm	2.98 kg / 2984 g 29.3 N 6 207 Gs	2.69 kg / 2686 g 26.3 N ~0 Gs
5 mm	1.48 kg / 1479 g 14.5 N 4 369 Gs	1.33 kg / 1331 g 13.1 N ~0 Gs
10 mm	0.26 kg / 260 g 2.5 N 1 830 Gs	0.23 kg / 234 g 2.3 N ~0 Gs
20 mm	0.02 kg / 17 g 0.2 N 468 Gs	0.02 kg / 15 g 0.1 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 47 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a much further distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a further horizon of action. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is huge. The repulsion force is slightly lower than the connection force, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Hazards (electronics) - precautionary measures
MW 8x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	4.5 cm
Hearing aid	10 Gs (1.0 mT)	3.5 cm
Mechanical watch	20 Gs (2.0 mT)	3.0 cm
Mobile device	40 Gs (4.0 mT)	2.5 cm
Car key	50 Gs (5.0 mT)	2.0 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 poses a real danger to IT equipment and medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MW 8x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	34.31 km/h (9.53 m/s)	0.09 J
30 mm	59.35 km/h (16.49 m/s)	0.26 J
50 mm	76.62 km/h (21.28 m/s)	0.43 J
100 mm	108.35 km/h (30.10 m/s)	0.85 J

NdFeB products are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Corrosion resistance
MW 8x5 / 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: Electrical Data (Flux)
MW 8x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 450 Mx	24.5 µWb
P_c Coefficient	0.68	High (Stable)

Flux value emitted by the magnet pole. Key data for generator designers and motors. The P_c coefficient defines the working geometry.

Table 11: Submerged application
MW 8x5 / N38

Environment	Effective steel pull	Effect
Air (land)	2.17 kg	Standard
Water (riverbed)	2.48 kg (+0.31 kg Buoyancy gain)	+14.5%

Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Warning: On a vertical surface, the magnet retains just ~20% of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.68

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 specification and ecology

Elemental analysis

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%

Sustainability

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: 010105-2025

Measurement Calculator

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UMC 20x6/3x7 / N38 - cylindrical magnetic holder

6.99 ZŁ brutto / pcs

This product is an extremely powerful cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø8x5 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.17 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is created for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 21.31 N with a weight of only 1.88 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel 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 high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 5 mm. The key parameter here is the holding force amounting to approximately 2.17 kg (force ~21.31 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.

This rod magnet is magnetized axially (along the height of 5 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.

Advantages and disadvantages of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:

Their power is maintained, and after approximately 10 years it drops only by ~1% (according to research),
They feature excellent resistance to magnetic field loss when exposed to external magnetic sources,
Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver gives an aesthetic appearance,
The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
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...
Possibility of precise shaping and adjusting to concrete requirements,
Fundamental importance in future technologies – they are used in mass storage devices, electric motors, medical equipment, also multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in miniature devices

Cons

Cons of neodymium magnets: tips and applications.

At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
Due to expensive raw materials, their price is relatively high,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Breakaway force was determined for ideal contact conditions, assuming:

on a base made of mild steel, perfectly concentrating the magnetic field
whose thickness equals approx. 10 mm
characterized by lack of roughness
without the slightest air gap between the magnet and steel
for force applied at a right angle (pull-off, not shear)
in neutral thermal conditions

Practical aspects of lifting capacity – factors

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

Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets

Medical implants

Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Crushing risk

Big blocks can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Machining danger

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Conscious usage

Handle with care. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can react.

GPS and phone interference

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

Electronic devices

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Danger to the youngest

Neodymium magnets are not suitable for play. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and requires immediate surgery.

Material brittleness

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

Demagnetization risk

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Skin irritation risks

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

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

MW 8x5 / N38 - cylindrical magnet

Want to talk magnets?

MW 8x5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - data

1. Sliding resistance

2. Steel saturation

3. Power loss vs temp

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

Elemental analysis

Sustainability

Pulling Force

Field Strength

Other offers

MW 45x20 / N38 - cylindrical magnet

MPL 40x7x3 / N38 - lamellar magnet

MW 5x7 / N38 - cylindrical magnet

UMC 20x6/3x7 / N38 - cylindrical magnetic holder

Advantages and disadvantages of rare earth magnets.

Pros

Cons

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Practical aspects of lifting capacity – factors

Medical implants

Crushing risk

Machining danger

Conscious usage

GPS and phone interference

Electronic devices

Danger to the youngest

Material brittleness

Demagnetization risk

Skin irritation risks

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C