Product available Ships in 2 days

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

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4.60 ZŁ with VAT / pcs + price for transport

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Technical - 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

Engineering modeling of the assembly - data

These values represent the result of a mathematical analysis. Results were calculated on models for the class Nd₂Fe₁₄B. Operational conditions may differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - power drop
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 sharply per each millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) significantly diminishes the holding power. Magnetic products hold most effectively in perfect adhesion; gap kills the force. Notice how flashily the parameters drop, when the magnet does not touch directly to the steel surface. When planning the mounting, avoid unnecessary gaps.

Table 2: Shear force (vertical surface)
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

The following data indicates the theoretical shear load required to initiate the sliding of the magnet vertically along a upright steel plate (considering typical friction). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
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 placing a holder on a upright surface (e.g., a fridge), it will maintain just about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slide down easier than they pop off the substrate. Designing a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a noticeably lighter cargo. Utilizing a rubberized pad can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
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 metal plate is not enough to take in the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the holding will be smaller. To achieve 100% of this neodymium's power, you need a suitably thick element of metal. The material oversaturation means that on thin elements (e.g., thin profiles), the product holds weaker. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
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

Ordinary NdFeB products irreversibly lose power past the thermal threshold. Protect against heat – excessive heat can permanently destroy this product. With increasing heat, the neodymium's capacity briefly lowers. Avoid using this product in hot environments higher than its safe range. Too high temperature will result in irreversible degradation of magnetic properties.

*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently sooner than long magnets. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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 attract each other from a significantly greater distance than a magnet and steel setup. The connection of magnet-to-magnet produces a massive flux and a wider radius of operation. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the collision energy is massive. The repulsion force is slightly lower than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Safety (HSE) (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
Timepiece	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

Powerful magnet radiation poses a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation penetrates the body and glass. Special caution must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - 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 very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

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)

Total magnetic flux emitted by the pole surface. Essential parameter for generator designers and motors. P_c value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Note: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

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

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 and environmental data

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%

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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The offered product is an extremely powerful cylinder magnet, produced from advanced NdFeB material, which, at dimensions of Ø8x20 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 1.30 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 12.71 N with a weight of only 7.54 g, this rod is indispensable in electronics and wherever every gram matters.

Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø8x20 mm, which, at a weight of 7.54 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 1.30 kg (force ~12.71 N), which, with such compact dimensions, proves the high power 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. 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 Nd₂Fe₁₄B magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They do not lose strength, even after approximately 10 years – the drop in power is only ~1% (theoretically),
They are resistant to demagnetization induced by external magnetic fields,
The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
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 detailed creating and adjusting to precise requirements,
Wide application in electronics industry – they are used in computer drives, electromotive mechanisms, medical equipment, and multitasking production systems.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:

To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
Limited possibility of making threads in the magnet and complex shapes - preferred is casing - magnetic holder.
Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

The specified lifting capacity refers to the limit force, recorded under optimal environment, namely:

on a block made of structural steel, optimally conducting the magnetic flux
whose transverse dimension is min. 10 mm
characterized by smoothness
without the slightest insulating layer between the magnet and steel
for force acting at a right angle (pull-off, not shear)
in temp. approx. 20°C

Key elements affecting lifting force

It is worth knowing that the application force will differ depending on elements below, in order of importance:

Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Temperature – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with NdFeB magnets

Protect data

Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Protective goggles

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Magnetic interference

An intense magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Machining danger

Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Conscious usage

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

No play value

Only for adults. Small elements can be swallowed, causing serious injuries. Keep out of reach of kids and pets.

Medical interference

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Crushing risk

Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Thermal limits

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

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, immediately stop handling magnets and use protective gear.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?

MW 8x20 / N38 - cylindrical magnet

Technical - MW 8x20 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

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

Table 2: Shear force (vertical surface) MW 8x20 / N38

Table 3: Vertical assembly (sliding) - vertical pull MW 8x20 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MW 8x20 / N38

Table 5: Thermal stability (material behavior) - thermal limit MW 8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MW 8x20 / N38

Table 7: Safety (HSE) (electronics) - warnings MW 8x20 / N38

Table 8: Collisions (cracking risk) - warning MW 8x20 / N38

Table 9: Corrosion resistance MW 8x20 / N38

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

Table 11: Underwater work (magnet fishing) MW 8x20 / N38

1. Vertical hold

2. Steel thickness impact

3. Heat tolerance

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

Chemical composition

Sustainability

Magnet pull force

Magnetic Induction

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Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Weaknesses

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

Key elements affecting lifting force

Precautions when working with NdFeB magnets

Protect data

Protective goggles

Magnetic interference

Machining danger

Conscious usage

No play value

Medical interference

Crushing risk

Thermal limits

Allergy Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Shear force (vertical surface)
MW 8x20 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MW 8x20 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x20 / N38

Table 5: Thermal stability (material behavior) - thermal limit
MW 8x20 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 8x20 / N38

Table 7: Safety (HSE) (electronics) - warnings
MW 8x20 / N38

Table 8: Collisions (cracking risk) - warning
MW 8x20 / N38

Table 9: Corrosion resistance
MW 8x20 / N38

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

Table 11: Underwater work (magnet fishing)
MW 8x20 / N38

Advantages and disadvantages of Nd₂Fe₁₄B magnets.