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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

6.61 kg / 64.88 N

Magnetic Induction

277.16 mT

Coating

[NiCuNi] Nickel

5.56 ZŁ with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

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MW 20x5 / N38 - cylindrical magnet

Specification / characteristics MW 20x5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010044
GTIN	5906301810438
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	20 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	11.78 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.61 kg / 64.88 N
Magnetic Induction ~ ?	277.16 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x5 / N38 - cylindrical magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [Min. - Max.] ?	36-38	BH max MGOe
energy density [Min. - Max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅Cm
Bending strength	250	Mpa
Compressive strength	1000~1100	Mpa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 106	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10-6	°C^-1
Young's modulus	1.7 x 104	kg/mm²

Engineering modeling of the assembly - data

The following data constitute the outcome of a engineering simulation. Values were calculated on models for the class NdFeB. Real-world parameters may differ. Use these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MW 20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2771 Gs 277.1 mT	6.61 kg / 6610.0 g 64.8 N	medium risk
1 mm	2573 Gs 257.3 mT	5.70 kg / 5699.1 g 55.9 N	medium risk
2 mm	2340 Gs 234.0 mT	4.71 kg / 4712.0 g 46.2 N	medium risk
5 mm	1611 Gs 161.1 mT	2.24 kg / 2235.2 g 21.9 N	medium risk
10 mm	775 Gs 77.5 mT	0.52 kg / 516.6 g 5.1 N	low risk
15 mm	387 Gs 38.7 mT	0.13 kg / 128.8 g 1.3 N	low risk
20 mm	211 Gs 21.1 mT	0.04 kg / 38.4 g 0.4 N	low risk
30 mm	80 Gs 8.0 mT	0.01 kg / 5.5 g 0.1 N	low risk
50 mm	20 Gs 2.0 mT	0.00 kg / 0.4 g 0.0 N	low risk

Grip strength decreases sharply per each millimeter of spacing. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) strongly diminishes the holding power. Neodymiums work optimally at the point of direct contact; distance nullifies the power. Analyze how flashily the parameters drop, when the product does not touch flatly to the metal substrate. When planning the arrangement, eliminate unnecessary gaps.

Table 2: Vertical assembly (sliding) - behavior on slippery surfaces
MW 20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.98 kg / 1983.0 g 19.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.32 kg / 1322.0 g 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.66 kg / 661.0 g 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.31 kg / 3305.0 g 32.4 N

When hanging a magnet on a vertical wall (e.g., a fridge), it will only hold just about 1/5 of nominal attraction strength. Gravity and a weak degree of grip mean that holders slide down faster than they detach. Want to create a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter weight. Using a rubber layer can significantly increase the grip.

Table 3: Material efficiency (saturation) - sheet metal selection
MW 20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.66 kg / 661.0 g 6.5 N
1 mm	25%	1.65 kg / 1652.5 g 16.2 N
2 mm	50%	3.31 kg / 3305.0 g 32.4 N
5 mm	100%	6.61 kg / 6610.0 g 64.8 N
10 mm	100%	6.61 kg / 6610.0 g 64.8 N

A thin sheet is incapable of conduct the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet works worse. We recommend selecting the steel cross-section according to the table below.

Table 4: Working in heat (material behavior) - thermal limit
MW 20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.61 kg / 6610.0 g 64.8 N	OK
40 °C	-2.2%	6.46 kg / 6464.6 g 63.4 N	OK
60 °C	-4.4%	6.32 kg / 6319.2 g 62.0 N	OK
80 °C	-6.6%	6.17 kg / 6173.7 g 60.6 N
100 °C	-28.8%	4.71 kg / 4706.3 g 46.2 N

Ordinary NdFeB products change their properties parameters past the thermal threshold. Protect against heat – excessive heat can irreversibly damage this magnet. As the temperature rises, the neodymium's force briefly decreases. Refrain from using this product close to ovens exceeding its working range. Ignoring the limit will cause permanent loss of magnetic properties.

Table 5: Magnet-Magnet interaction (attraction) - field collision
MW 20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.92 kg / 9915.0 g 97.3 N	N/A
2 mm	7.06 kg / 7065.0 g 69.3 N	6.59 kg / 6594.0 g 64.7 N
5 mm	3.36 kg / 3360.0 g 33.0 N	3.14 kg / 3136.0 g 30.8 N
10 mm	0.78 kg / 780.0 g 7.7 N	0.73 kg / 728.0 g 7.1 N
20 mm	0.06 kg / 60.0 g 0.6 N	0.06 kg / 56.0 g 0.5 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnetic products interact from a wider radius than a neodymium and metal combination. The setup of two magnets creates a more powerful interaction and a larger range of action. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The repulsion force is a bit weaker than the connection force, but still large.

Table 6: Protective zones (electronics) - precautionary measures
MW 20x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	8.5 cm
Hearing aid	10 Gs (1.0 mT)	6.5 cm
Mechanical watch	20 Gs (2.0 mT)	5.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Remote	50 Gs (5.0 mT)	4.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

A strong magnetic field is a large risk to electronic devices as well as pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 7: Impact energy (kinetic energy) - collision effects
MW 20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.03 km/h (6.95 m/s)	0.28 J
30 mm	41.40 km/h (11.50 m/s)	0.78 J
50 mm	53.42 km/h (14.84 m/s)	1.30 J
100 mm	75.55 km/h (20.98 m/s)	2.59 J

Magnetic elements are delicate – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when playing with powerful specimens.

Table 8: Surface protection spec
MW 20x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 9: Hydrostatics and buoyancy
MW 20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.61 kg	Standard
Water (riverbed)	7.57 kg (+0.96 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.

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

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MW 8x20 / N38 - cylindrical magnet

4.60 ZŁ brutto / pcs

The presented product is an exceptionally strong rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø20x5 mm, guarantees optimal power. The MW 20x5 / N38 component boasts high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 6.61 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 64.88 N with a weight of only 11.78 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, 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 industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.

The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 5 mm. The value of 64.88 N means that the magnet is capable of holding a weight many times exceeding its own mass of 11.78 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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 20 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.

Strengths as well as weaknesses of NdFeB magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
They have excellent resistance to magnetic field loss as a result of external magnetic sources,
The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
Magnets are distinguished by excellent magnetic induction on the outer layer,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to modularity in forming and the ability to adapt to client solutions,
Significant place in electronics industry – they are commonly used in mass storage devices, motor assemblies, medical devices, and technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in miniature devices

Problematic aspects of neodymium magnets and ways of using them

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Due to limitations in producing nuts and complex shapes in magnets, we propose using casing - magnetic mechanism.
Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical after entering the body.
With budget limitations the cost of neodymium magnets can be a barrier,

Best holding force of the magnet in ideal parameters – what affects it?

The force parameter is a result of laboratory testing executed under standard conditions:

on a block made of mild steel, optimally conducting the magnetic field
possessing a massiveness of minimum 10 mm to ensure full flux closure
characterized by lack of roughness
without any air gap between the magnet and steel
under perpendicular force vector (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Bear in mind that the magnet holding will differ influenced by elements below, in order of importance:

Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was measured using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the lifting capacity.

H&S for magnets

Danger to pacemakers

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

Do not drill into magnets

Dust produced during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Handling rules

Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Magnetic interference

Remember: neodymium magnets produce a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.

Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

This is not a toy

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

Pinching danger

Pinching hazard: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Skin irritation risks

Some people experience a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause an allergic reaction. We recommend wear safety gloves.

Electronic hazard

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Safety First!

Need more info? Check our post: Are neodymium magnets dangerous?

MW 20x5 / N38 - cylindrical magnet

MW 20x5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

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MW 8x20 / N38 - cylindrical magnet

Strengths as well as weaknesses of NdFeB magnets.

Best holding force of the magnet in ideal parameters – what affects it?

Determinants of practical lifting force of a magnet

H&S for magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C