Product available Ships today (order by 14:00)

MW 20x18 / 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: PLN 1-6500
Rating: 5

cylindrical magnet

Catalog no 010040

GTIN/EAN: 5906301810391

Diameter Ø

20 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

42.41 g

Magnetization Direction

↑ axial

Load capacity

13.19 kg / 129.35 N

Magnetic Induction

541.64 mT / 5416 Gs

Coating

[NiCuNi] Nickel

technical parameters »

23.54 ZŁ with VAT / pcs + price for transport

19.14 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

19.14 ZŁ

23.54 ZŁ

price from 40 pcs

17.99 ZŁ

22.13 ZŁ

price from 140 pcs

16.84 ZŁ

20.72 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Not sure what to buy?

Call us +48 22 499 98 98 otherwise contact us through inquiry form the contact section.
Weight along with structure of a neodymium magnet can be tested with our online calculation tool.

Orders submitted before 14:00 will be dispatched today!

Technical details - MW 20x18 / N38 - cylindrical magnet

Specification / characteristics - MW 20x18 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010040
GTIN/EAN	5906301810391
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	18 mm [±0,1 mm]
Weight	42.41 g
Magnetization Direction	↑ axial
Load capacity ~ ?	13.19 kg / 129.35 N
Magnetic Induction ~ ?	541.64 mT / 5416 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x18 / 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 simulation of the product - data

The following information constitute the outcome of a mathematical calculation. Results were calculated on models for the material Nd₂Fe₁₄B. Actual conditions may deviate from the simulation results. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
MW 20x18 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5414 Gs 541.4 mT	13.19 kg / 29.08 pounds 13190.0 g / 129.4 N	critical level
1 mm	4870 Gs 487.0 mT	10.67 kg / 23.52 pounds 10669.5 g / 104.7 N	critical level
2 mm	4330 Gs 433.0 mT	8.43 kg / 18.59 pounds 8434.2 g / 82.7 N	strong
3 mm	3816 Gs 381.6 mT	6.55 kg / 14.45 pounds 6552.7 g / 64.3 N	strong
5 mm	2913 Gs 291.3 mT	3.82 kg / 8.42 pounds 3818.4 g / 37.5 N	strong
10 mm	1455 Gs 145.5 mT	0.95 kg / 2.10 pounds 952.2 g / 9.3 N	safe
15 mm	775 Gs 77.5 mT	0.27 kg / 0.60 pounds 270.1 g / 2.7 N	safe
20 mm	450 Gs 45.0 mT	0.09 kg / 0.20 pounds 91.3 g / 0.9 N	safe
30 mm	188 Gs 18.8 mT	0.02 kg / 0.04 pounds 15.9 g / 0.2 N	safe
50 mm	54 Gs 5.4 mT	0.00 kg / 0.00 pounds 1.3 g / 0.0 N	safe

Grip strength decreases sharply with every mm of gap. Remember that even a microscopic distance (e.g., contamination, varnish, rust) significantly diminishes the holding power. Magnetic products work strongest during direct contact; gap nullifies the force. Analyze how flashily the parameters plummet, when the magnet does not adhere flatly to the metal substrate. When designing the mounting, discard additional spacers.

Table 2: Sliding load (wall)
MW 20x18 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	2.64 kg / 5.82 pounds 2638.0 g / 25.9 N
1 mm	Stal (~0.2)	2.13 kg / 4.70 pounds 2134.0 g / 20.9 N
2 mm	Stal (~0.2)	1.69 kg / 3.72 pounds 1686.0 g / 16.5 N
3 mm	Stal (~0.2)	1.31 kg / 2.89 pounds 1310.0 g / 12.9 N
5 mm	Stal (~0.2)	0.76 kg / 1.68 pounds 764.0 g / 7.5 N
10 mm	Stal (~0.2)	0.19 kg / 0.42 pounds 190.0 g / 1.9 N
15 mm	Stal (~0.2)	0.05 kg / 0.12 pounds 54.0 g / 0.5 N
20 mm	Stal (~0.2)	0.02 kg / 0.04 pounds 18.0 g / 0.2 N
30 mm	Stal (~0.2)	0.00 kg / 0.01 pounds 4.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

The following data shows the approximate weight limit sufficient to start the sliding of the magnet vertically on a upright metal surface (assuming standard friction coefficient). The holding force depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x18 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	3.96 kg / 8.72 pounds 3957.0 g / 38.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.64 kg / 5.82 pounds 2638.0 g / 25.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.32 kg / 2.91 pounds 1319.0 g / 12.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	6.60 kg / 14.54 pounds 6595.0 g / 64.7 N

When mounting a holder on a upright surface (e.g., a fridge), it you can count on only approx. 1/5 of its nominal power. Gravity and a weak degree of grip mean that products slide down faster than they detach. Want to create a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slip down under a noticeably lighter cargo. Using a rubber layer can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 20x18 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	5%	0.66 kg / 1.45 pounds 659.5 g / 6.5 N
1 mm	13%	1.65 kg / 3.63 pounds 1648.8 g / 16.2 N
2 mm	25%	3.30 kg / 7.27 pounds 3297.5 g / 32.3 N
3 mm	38%	4.95 kg / 10.90 pounds 4946.3 g / 48.5 N
5 mm	63%	8.24 kg / 18.17 pounds 8243.8 g / 80.9 N
10 mm	100%	13.19 kg / 29.08 pounds 13190.0 g / 129.4 N
11 mm	100%	13.19 kg / 29.08 pounds 13190.0 g / 129.4 N
12 mm	100%	13.19 kg / 29.08 pounds 13190.0 g / 129.4 N

A thin metal plate cannot take in the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (stability) - power drop
MW 20x18 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	13.19 kg / 29.08 pounds 13190.0 g / 129.4 N	OK
40 °C	-2.2%	12.90 kg / 28.44 pounds 12899.8 g / 126.5 N	OK
60 °C	-4.4%	12.61 kg / 27.80 pounds 12609.6 g / 123.7 N	OK
80 °C	-6.6%	12.32 kg / 27.16 pounds 12319.5 g / 120.9 N
100 °C	-28.8%	9.39 kg / 20.70 pounds 9391.3 g / 92.1 N

Standard neodymium magnets lose parameters past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the neodymium's capacity briefly drops. Refrain from using this product close to heaters higher than its safe range. Ignoring the limit will result in permanent loss of magnetic properties.

*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 20x18 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	56.78 kg / 125.17 pounds 5 968 Gs	8.52 kg / 18.78 pounds 8516 g / 83.5 N	N/A
1 mm	51.26 kg / 113.01 pounds 10 289 Gs	7.69 kg / 16.95 pounds 7689 g / 75.4 N	46.13 kg / 101.71 pounds ~0 Gs
2 mm	45.93 kg / 101.25 pounds 9 739 Gs	6.89 kg / 15.19 pounds 6889 g / 67.6 N	41.33 kg / 91.13 pounds ~0 Gs
3 mm	40.93 kg / 90.24 pounds 9 194 Gs	6.14 kg / 13.54 pounds 6140 g / 60.2 N	36.84 kg / 81.22 pounds ~0 Gs
5 mm	32.06 kg / 70.68 pounds 8 137 Gs	4.81 kg / 10.60 pounds 4809 g / 47.2 N	28.86 kg / 63.62 pounds ~0 Gs
10 mm	16.44 kg / 36.24 pounds 5 826 Gs	2.47 kg / 5.44 pounds 2465 g / 24.2 N	14.79 kg / 32.61 pounds ~0 Gs
20 mm	4.10 kg / 9.04 pounds 2 909 Gs	0.61 kg / 1.36 pounds 615 g / 6.0 N	3.69 kg / 8.13 pounds ~0 Gs
50 mm	0.15 kg / 0.34 pounds 565 Gs	0.02 kg / 0.05 pounds 23 g / 0.2 N	0.14 kg / 0.31 pounds ~0 Gs
60 mm	0.07 kg / 0.15 pounds 376 Gs	0.01 kg / 0.02 pounds 10 g / 0.1 N	0.06 kg / 0.14 pounds ~0 Gs
70 mm	0.03 kg / 0.07 pounds 262 Gs	0.00 kg / 0.01 pounds 5 g / 0.0 N	0.03 kg / 0.07 pounds ~0 Gs
80 mm	0.02 kg / 0.04 pounds 190 Gs	0.00 kg / 0.01 pounds 3 g / 0.0 N	0.02 kg / 0.03 pounds ~0 Gs
90 mm	0.01 kg / 0.02 pounds 142 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs
100 mm	0.01 kg / 0.01 pounds 109 Gs	0.00 kg / 0.00 pounds 1 g / 0.0 N	0.00 kg / 0.00 pounds ~0 Gs

Two magnetic products attract each other from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Figures refer to shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MW 20x18 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	12.5 cm
Hearing aid	10 Gs (1.0 mT)	9.5 cm
Mechanical watch	20 Gs (2.0 mT)	7.5 cm
Mobile device	40 Gs (4.0 mT)	6.0 cm
Car key	50 Gs (5.0 mT)	5.5 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

A strong magnetic field poses a serious hazard to electronic devices and pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 20x18 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.57 km/h (5.16 m/s)	0.56 J
30 mm	30.83 km/h (8.56 m/s)	1.56 J
50 mm	39.77 km/h (11.05 m/s)	2.59 J
100 mm	56.24 km/h (15.62 m/s)	5.18 J

NdFeB products are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MW 20x18 / 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: Construction data (P_c)
MW 20x18 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	17 374 Mx	173.7 µWb
P_c Coefficient	0.85	High (Stable)

Flux value emitted by the pole surface. Essential parameter for generator designers as well as sensors. P_c value defines the working geometry.

Table 11: Submerged application
MW 20x18 / N38

Environment	Effective steel pull	Effect
Air (land)	13.19 kg	Standard
Water (riverbed)	15.10 kg (+1.91 kg buoyancy gain)	+14.5%

Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Heat tolerance

*For N38 grade, 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) = 0.85

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%

Ecology and recycling (GPSR)

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: 010040-2026

Magnet Unit Converter

Magnet pull force

Force in kg

Force in lbs

Magnetic Field

Just fill in one field, and the calculator calculate the rest for you.

Other products

Product available Ships today (order by 14:00)

SM 18x125 [2xM5] / N42 - magnetic separator

276.75 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

SM 25x325 [2xM8] / N42 - magnetic separator

910.20 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

UMT 20x25 white / N38 - board holder

3.49 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 5x10 / N38 - cylindrical magnet

0.800 ZŁ brutto / pcs

The presented product is an exceptionally strong rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø20x18 mm, guarantees optimal power. The MW 20x18 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 13.19 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 129.35 N with a weight of only 42.41 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.

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., 20.1 mm) using two-component epoxy glues. 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 popular 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 (Ø20x18), 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 18 mm. The value of 129.35 N means that the magnet is capable of holding a weight many times exceeding its own mass of 42.41 g. 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 18 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 through the diameter if your project requires it.

Pros as well as cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:

Their magnetic field is durable, and after around ten years it decreases only by ~1% (theoretically),
They are noted for resistance to demagnetization induced by external magnetic fields,
The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to look better,
Magnetic induction on the working part of the magnet turns out to be strong,
Neodymium magnets are characterized by very 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...
Due to the ability of precise molding and adaptation to custom projects, magnetic components can be modeled in a broad palette of shapes and sizes, which makes them more universal,
Huge importance in electronics industry – they find application in magnetic memories, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets and ways of using them

They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Limited ability of making nuts in the magnet and complicated shapes - preferred is casing - magnetic holder.
Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Magnet power was determined for the most favorable conditions, taking into account:

using a base made of mild steel, serving as a ideal flux conductor
with a thickness of at least 10 mm
with a surface free of scratches
with total lack of distance (without impurities)
during pulling in a direction vertical to the mounting surface
at standard ambient temperature

Lifting capacity in real conditions – factors

Effective lifting capacity impacted by working environment parameters, including (from priority):

Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
Angle of force application – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
Plate material – mild steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

H&S for magnets

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or opt for coated magnets.

Dust is flammable

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Operating temperature

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

Product not for children

Neodymium magnets are not intended for children. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires immediate surgery.

Material brittleness

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Life threat

People with a heart stimulator have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the implant.

Caution required

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

Keep away from electronics

A strong magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.

Threat to electronics

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Bone fractures

Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?

MW 20x18 / N38 - cylindrical magnet

Technical details - MW 20x18 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the product - data

Table 1: Static pull force (force vs gap) - characteristics MW 20x18 / N38

Table 2: Sliding load (wall) MW 20x18 / N38

Table 3: Vertical assembly (sliding) - vertical pull MW 20x18 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MW 20x18 / N38

Table 5: Thermal stability (stability) - power drop MW 20x18 / N38

Table 6: Two magnets (repulsion) - field range MW 20x18 / N38

Table 7: Safety (HSE) (implants) - warnings MW 20x18 / N38

Table 8: Impact energy (cracking risk) - warning MW 20x18 / N38

Table 9: Surface protection spec MW 20x18 / N38

Table 10: Construction data (Pc) MW 20x18 / N38

Table 11: Submerged application MW 20x18 / N38

1. Vertical hold

2. Steel thickness impact

3. Heat tolerance

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

Chemical composition

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

Other products

SM 18x125 [2xM5] / N42 - magnetic separator

SM 25x325 [2xM8] / N42 - magnetic separator

UMT 20x25 white / N38 - board holder

MW 5x10 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

Strengths

Disadvantages

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Lifting capacity in real conditions – factors

H&S for magnets

Warning for allergy sufferers

Dust is flammable

Operating temperature

Product not for children

Material brittleness

Life threat

Caution required

Keep away from electronics

Threat to electronics

Bone fractures

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MW 20x18 / N38

Table 2: Sliding load (wall)
MW 20x18 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x18 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 20x18 / N38

Table 5: Thermal stability (stability) - power drop
MW 20x18 / N38

Table 6: Two magnets (repulsion) - field range
MW 20x18 / N38

Table 7: Safety (HSE) (implants) - warnings
MW 20x18 / N38

Table 8: Impact energy (cracking risk) - warning
MW 20x18 / N38

Table 9: Surface protection spec
MW 20x18 / N38

Table 10: Construction data (P_c)
MW 20x18 / N38

Table 11: Submerged application
MW 20x18 / N38