Product available Ships today (order by 14:00)

MW 8x20 / 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 010475

GTIN/EAN: 5906301811138

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

1.30 kg / 12.71 N

Magnetic Induction

607.01 mT / 6070 Gs

Coating

[NiCuNi] Nickel

view specifications »

4.60 ZŁ with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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Technical parameters of the product - MW 8x20 / N38 - cylindrical magnet

Specification / characteristics - MW 8x20 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010475
GTIN/EAN	5906301811138
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	20 mm [±0,1 mm]
Weight	7.54 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	1.30 kg / 12.71 N
Magnetic Induction ~ ?	607.01 mT / 6070 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / 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 simulation of the magnet - report

The following information constitute the result of a mathematical analysis. Values were calculated on algorithms for the class Nd₂Fe₁₄B. Actual conditions may differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MW 8x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6064 Gs 606.4 mT	1.30 kg / 1300.0 g 12.8 N	safe
1 mm	4587 Gs 458.7 mT	0.74 kg / 743.7 g 7.3 N	safe
2 mm	3327 Gs 332.7 mT	0.39 kg / 391.4 g 3.8 N	safe
3 mm	2388 Gs 238.8 mT	0.20 kg / 201.6 g 2.0 N	safe
5 mm	1281 Gs 128.1 mT	0.06 kg / 58.0 g 0.6 N	safe
10 mm	389 Gs 38.9 mT	0.01 kg / 5.4 g 0.1 N	safe
15 mm	169 Gs 16.9 mT	0.00 kg / 1.0 g 0.0 N	safe
20 mm	90 Gs 9.0 mT	0.00 kg / 0.3 g 0.0 N	safe
30 mm	35 Gs 3.5 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	safe

Magnetic force decreases significantly with every mm of distance. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably reduces the pull force. Magnetic products operate optimally in perfect adhesion; distance nullifies the force. See how flashily the parameters fall, when the magnet does not touch directly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Slippage load (wall)
MW 8x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.26 kg / 260.0 g 2.6 N
1 mm	Stal (~0.2)	0.15 kg / 148.0 g 1.5 N
2 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
3 mm	Stal (~0.2)	0.04 kg / 40.0 g 0.4 N
5 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 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 shows the approximate holding capacity necessary to cause the sliding of the magnet downwards on a vertical steel plate (considering typical friction). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.39 kg / 390.0 g 3.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.26 kg / 260.0 g 2.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.13 kg / 130.0 g 1.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.65 kg / 650.0 g 6.4 N

When hanging a magnet on a upright surface (e.g., a car body), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that holders slip faster than they detach. Planning a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a much lighter cargo. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 8x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.13 kg / 130.0 g 1.3 N
1 mm	25%	0.33 kg / 325.0 g 3.2 N
2 mm	50%	0.65 kg / 650.0 g 6.4 N
5 mm	100%	1.30 kg / 1300.0 g 12.8 N
10 mm	100%	1.30 kg / 1300.0 g 12.8 N

A thin sheet is unable to absorb the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you need a suitably thick piece of metal. The saturation effect causes that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MW 8x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.30 kg / 1300.0 g 12.8 N	OK
40 °C	-2.2%	1.27 kg / 1271.4 g 12.5 N	OK
60 °C	-4.4%	1.24 kg / 1242.8 g 12.2 N	OK
80 °C	-6.6%	1.21 kg / 1214.2 g 11.9 N
100 °C	-28.8%	0.93 kg / 925.6 g 9.1 N

Standard neodymium magnets change their properties strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly demagnetize this product. With every degree above norm, the neodymium's power momentarily drops. Avoid using this product in hot environments exceeding its working range. Ignoring the limit will result in permanent loss of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	11.40 kg / 11396 g 111.8 N 6 154 Gs	N/A
1 mm	8.76 kg / 8758 g 85.9 N 10 632 Gs	7.88 kg / 7882 g 77.3 N ~0 Gs
2 mm	6.52 kg / 6520 g 64.0 N 9 174 Gs	5.87 kg / 5868 g 57.6 N ~0 Gs
3 mm	4.76 kg / 4758 g 46.7 N 7 837 Gs	4.28 kg / 4282 g 42.0 N ~0 Gs
5 mm	2.46 kg / 2461 g 24.1 N 5 637 Gs	2.22 kg / 2215 g 21.7 N ~0 Gs
10 mm	0.51 kg / 508 g 5.0 N 2 561 Gs	0.46 kg / 457 g 4.5 N ~0 Gs
20 mm	0.05 kg / 47 g 0.5 N 778 Gs	0.04 kg / 42 g 0.4 N ~0 Gs
50 mm	0.00 kg / 1 g 0.0 N 107 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a wider radius than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is massive. The levitation is slightly lower than the attraction, but still large.
*Field value between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Protective zones (electronics) - warnings
MW 8x20 / 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)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a large risk to electronics as well as medical implants. These magnets produce a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MW 8x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	13.28 km/h (3.69 m/s)	0.05 J
30 mm	22.94 km/h (6.37 m/s)	0.15 J
50 mm	29.61 km/h (8.23 m/s)	0.26 J
100 mm	41.88 km/h (11.63 m/s)	0.51 J

Neodymium magnets are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MW 8x20 / 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 (P_c)
MW 8x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 457 Mx	34.6 µWb
P_c Coefficient	1.31	High (Stable)

Flux value passing through the magnet pole. Key data for generator designers as well as sensors. The P_c coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 8x20 / N38

Environment	Effective steel pull	Effect
Air (land)	1.30 kg	Standard
Water (riverbed)	1.49 kg (+0.19 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!

In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.31

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

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%

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: 010475-2025

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MW 15x5 / N38 - cylindrical magnet

3.20 ZŁ brutto / pcs

This product is an incredibly powerful cylinder magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø8x20 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 1.30 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 12.71 N with a weight of only 7.54 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 do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 1.30 kg (force ~12.71 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.

This cylinder is magnetized axially (along the height of 20 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.

Pros and cons of Nd₂Fe₁₄B magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:

They do not lose strength, even during nearly 10 years – the decrease in power is only ~1% (based on measurements),
They have excellent resistance to magnetic field loss as a result of external fields,
In other words, due to the shiny finish of gold, the element gains visual value,
Magnetic induction on the surface of the magnet turns out to be strong,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Possibility of precise machining and modifying to atypical conditions,
Wide application in modern technologies – they are commonly used in HDD drives, motor assemblies, advanced medical instruments, as well as other advanced devices.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets: application proposals

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Limited ability of creating threads in the magnet and complex shapes - preferred is a housing - mounting mechanism.
Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The load parameter shown refers to the limit force, obtained under ideal test conditions, meaning:

using a base made of mild steel, acting as a ideal flux conductor
with a cross-section minimum 10 mm
characterized by smoothness
with zero gap (no impurities)
for force acting at a right angle (pull-off, not shear)
at room temperature

Impact of factors on magnetic holding capacity in practice

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

Distance (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
Base massiveness – too thin sheet causes magnetic saturation, causing part of the power to be wasted into the air.
Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and holding force.
Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets

Bodily injuries

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

Allergic reactions

Certain individuals experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Frequent touching can result in an allergic reaction. We recommend use safety gloves.

GPS Danger

A powerful magnetic field interferes with the functioning of compasses in phones and navigation systems. Keep magnets near a device to avoid damaging the sensors.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Dust is flammable

Powder generated during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Medical interference

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Data carriers

Data protection: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Product not for children

Always keep magnets out of reach of children. Choking hazard is high, and the effects of magnets connecting inside the body are very dangerous.

Demagnetization risk

Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

Safe operation

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

Caution! Learn more about hazards in the article: Magnet Safety Guide.

MW 8x20 / N38 - cylindrical magnet

Technical parameters of the product - MW 8x20 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the magnet - report

Table 1: Static force (pull vs distance) - interaction chart MW 8x20 / N38

Table 2: Slippage load (wall) MW 8x20 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 8x20 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 8x20 / N38

Table 5: Working in heat (stability) - resistance threshold MW 8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision MW 8x20 / N38

Table 7: Protective zones (electronics) - warnings MW 8x20 / N38

Table 8: Dynamics (kinetic energy) - warning MW 8x20 / N38

Table 9: Surface protection spec MW 8x20 / N38

Table 10: Electrical data (Pc) MW 8x20 / N38

Table 11: Hydrostatics and buoyancy MW 8x20 / N38

1. Shear force

2. Plate thickness effect

3. Heat tolerance

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

Material specification

Sustainability

Pulling force

Field Strength

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MW 15x5 / N38 - cylindrical magnet

Pros and cons of Nd2Fe14B magnets.

Advantages

Cons

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

Impact of factors on magnetic holding capacity in practice

Safe handling of neodymium magnets

Bodily injuries

Allergic reactions

GPS Danger

Fragile material

Dust is flammable

Medical interference

Data carriers

Product not for children

Demagnetization risk

Safe operation

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - interaction chart
MW 8x20 / N38

Table 2: Slippage load (wall)
MW 8x20 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x20 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 8x20 / N38

Table 5: Working in heat (stability) - resistance threshold
MW 8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x20 / N38

Table 7: Protective zones (electronics) - warnings
MW 8x20 / N38

Table 8: Dynamics (kinetic energy) - warning
MW 8x20 / N38

Table 9: Surface protection spec
MW 8x20 / N38

Table 10: Electrical data (P_c)
MW 8x20 / N38

Table 11: Hydrostatics and buoyancy
MW 8x20 / N38

Pros and cons of Nd₂Fe₁₄B magnets.