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MW 20x5 / 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 010044

GTIN/EAN: 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

6.93 kg / 67.95 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

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Technical details - MW 20x5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010044
GTIN/EAN	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 ~ ?	6.93 kg / 67.95 N
Magnetic Induction ~ ?	277.16 mT / 2772 Gs
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	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 values constitute the direct effect of a mathematical simulation. Values are based on algorithms for the material Nd₂Fe₁₄B. Real-world conditions may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MW 20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2771 Gs 277.1 mT	6.93 kg / 6930.0 g 68.0 N	warning
1 mm	2573 Gs 257.3 mT	5.97 kg / 5975.0 g 58.6 N	warning
2 mm	2340 Gs 234.0 mT	4.94 kg / 4940.1 g 48.5 N	warning
3 mm	2092 Gs 209.2 mT	3.95 kg / 3948.3 g 38.7 N	warning
5 mm	1611 Gs 161.1 mT	2.34 kg / 2343.4 g 23.0 N	warning
10 mm	775 Gs 77.5 mT	0.54 kg / 541.6 g 5.3 N	safe
15 mm	387 Gs 38.7 mT	0.13 kg / 135.0 g 1.3 N	safe
20 mm	211 Gs 21.1 mT	0.04 kg / 40.2 g 0.4 N	safe
30 mm	80 Gs 8.0 mT	0.01 kg / 5.7 g 0.1 N	safe
50 mm	20 Gs 2.0 mT	0.00 kg / 0.4 g 0.0 N	safe

Magnetic force weakens sharply per each millimeter of distance. Note that even a very thin break (e.g., contamination, paint, rust) significantly weakens the grip. Magnets work strongest at the point of direct contact; gap drastically cuts the power. See how flashily the load capacity fall, when the magnet does not touch tightly to the steel surface. When calculating the mounting, avoid redundant distances.

Table 2: Slippage load (vertical surface)
MW 20x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.39 kg / 1386.0 g 13.6 N
1 mm	Stal (~0.2)	1.19 kg / 1194.0 g 11.7 N
2 mm	Stal (~0.2)	0.99 kg / 988.0 g 9.7 N
3 mm	Stal (~0.2)	0.79 kg / 790.0 g 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 468.0 g 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 108.0 g 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below shows the theoretical holding capacity sufficient to cause the shifting of the magnet vertically on a upright steel plate (assuming standard friction). This parameter varies with the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.08 kg / 2079.0 g 20.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.39 kg / 1386.0 g 13.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.69 kg / 693.0 g 6.8 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.47 kg / 3465.0 g 34.0 N

When hanging a element on a vertical plane (e.g., a fridge), it will only hold barely about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient mean that holders slide down faster than they pull off. Designing a vertical fastening? Consider that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slip down under a much lighter cargo. Using a rubber pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - power losses
MW 20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.69 kg / 693.0 g 6.8 N
1 mm	25%	1.73 kg / 1732.5 g 17.0 N
2 mm	50%	3.47 kg / 3465.0 g 34.0 N
5 mm	100%	6.93 kg / 6930.0 g 68.0 N
10 mm	100%	6.93 kg / 6930.0 g 68.0 N

A thin sheet is incapable of focus the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To utilize 100% of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the product holds weaker. We advise picking the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.93 kg / 6930.0 g 68.0 N	OK
40 °C	-2.2%	6.78 kg / 6777.5 g 66.5 N	OK
60 °C	-4.4%	6.63 kg / 6625.1 g 65.0 N
80 °C	-6.6%	6.47 kg / 6472.6 g 63.5 N
100 °C	-28.8%	4.93 kg / 4934.2 g 48.4 N

Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly damage this product. As the temperature rises, the neodymium's force briefly drops. Do not use this magnet close to heaters higher than its operating temperature limit. Too high temperature will lead to destruction of magnetism.

*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	14.87 kg / 14871 g 145.9 N 4 380 Gs	N/A
1 mm	13.89 kg / 13893 g 136.3 N 5 357 Gs	12.50 kg / 12504 g 122.7 N ~0 Gs
2 mm	12.82 kg / 12822 g 125.8 N 5 146 Gs	11.54 kg / 11540 g 113.2 N ~0 Gs
3 mm	11.71 kg / 11713 g 114.9 N 4 918 Gs	10.54 kg / 10542 g 103.4 N ~0 Gs
5 mm	9.51 kg / 9513 g 93.3 N 4 433 Gs	8.56 kg / 8562 g 84.0 N ~0 Gs
10 mm	5.03 kg / 5029 g 49.3 N 3 223 Gs	4.53 kg / 4526 g 44.4 N ~0 Gs
20 mm	1.16 kg / 1162 g 11.4 N 1 549 Gs	1.05 kg / 1046 g 10.3 N ~0 Gs
50 mm	0.03 kg / 30 g 0.3 N 251 Gs	0.03 kg / 27 g 0.3 N ~0 Gs

Two strong neodymiums attract each other from a wider radius than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density between like poles drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).

Table 7: Hazards (implants) - 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

Powerful magnet radiation poses a large risk to IT equipment and pacemakers. These NdFeB products generate a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.63 km/h (7.12 m/s)	0.30 J
30 mm	42.39 km/h (11.77 m/s)	0.82 J
50 mm	54.70 km/h (15.19 m/s)	1.36 J
100 mm	77.35 km/h (21.49 m/s)	2.72 J

NdFeB products are very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet 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 powerful specimens.

Table 9: Anti-corrosion coating durability
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (P_c)
MW 20x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	9 675 Mx	96.7 µWb
P_c Coefficient	0.35	Low (Flat)

Flux value passing through the pole surface. Key data in coil applications as well as sensors. The P_c coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.93 kg	Standard
Water (riverbed)	7.93 kg (+1.00 kg Buoyancy gain)	+14.5%

Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Shear force

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.35

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: 010044-2025

Measurement Calculator

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Force (N)

Force in lbs

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Induction (T)

Input your figure in one of the inputs, and the remaining units will recalculate automatically.

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MW 35x5 / N38 - cylindrical magnet

13.81 ZŁ brutto / pcs

This product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø20x5 mm, guarantees optimal power. The MW 20x5 / N38 model is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 6.93 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard 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 positioning or actuating element. Thanks to the pull force of 67.95 N with a weight of only 11.78 g, this rod is indispensable in electronics and wherever every gram matters.

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 precision 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 frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. 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 warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 6.93 kg (force ~67.95 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 external factors, 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. 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.

Pros and cons of neodymium magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:

They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
Neodymium magnets are highly resistant to demagnetization caused by magnetic disturbances,
The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to look better,
Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
Due to the ability of flexible shaping and adaptation to custom solutions, NdFeB magnets can be created in a broad palette of geometric configurations, which makes them more universal,
Universal use in future technologies – they are used in HDD drives, motor assemblies, medical equipment, as well as other advanced devices.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.

To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
Due to neodymium price, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown concerns the limit force, measured under ideal test conditions, namely:

with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
possessing a thickness of min. 10 mm to avoid saturation
characterized by smoothness
with direct contact (no paint)
under axial force direction (90-degree angle)
at standard ambient temperature

Lifting capacity in real conditions – factors

In real-world applications, the real power results from a number of factors, ranked from the most important:

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces 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

Crushing force

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Heat sensitivity

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Do not underestimate power

Handle with care. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.

ICD Warning

Patients with a ICD have to maintain an large gap from magnets. The magnetism can stop the functioning of the implant.

Data carriers

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Keep away from children

Adult use only. Small elements can be swallowed, causing serious injuries. Store away from kids and pets.

Protective goggles

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

Impact on smartphones

A strong magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Fire warning

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

Security! Want to know more? Check our post: Are neodymium magnets dangerous?

MW 20x5 / N38 - cylindrical magnet

Technical details - MW 20x5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - data

Table 1: Static pull force (pull vs gap) - characteristics MW 20x5 / N38

Table 2: Slippage load (vertical surface) MW 20x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull MW 20x5 / N38

Table 4: Steel thickness (saturation) - power losses MW 20x5 / N38

Table 5: Thermal stability (material behavior) - resistance threshold MW 20x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field collision MW 20x5 / N38

Table 7: Hazards (implants) - precautionary measures MW 20x5 / N38

Table 8: Collisions (kinetic energy) - warning MW 20x5 / N38

Table 9: Anti-corrosion coating durability MW 20x5 / N38

Table 10: Electrical data (Pc) MW 20x5 / N38

Table 11: Underwater work (magnet fishing) MW 20x5 / N38

1. Shear force

2. Steel thickness impact

3. Heat tolerance

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

Chemical composition

Ecology and recycling (GPSR)

Force (pull)

Magnetic Induction

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MW 45x15 / N38 - cylindrical magnet

UMT 12x20 black set / N38 - board holder

MW 2x10 / N38 - cylindrical magnet

MW 35x5 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

Benefits

Cons

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Lifting capacity in real conditions – factors

H&S for magnets

Crushing force

Heat sensitivity

Do not underestimate power

ICD Warning

Data carriers

Allergy Warning

Keep away from children

Protective goggles

Impact on smartphones

Fire warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MW 20x5 / N38

Table 2: Slippage load (vertical surface)
MW 20x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x5 / N38

Table 4: Steel thickness (saturation) - power losses
MW 20x5 / N38

Table 5: Thermal stability (material behavior) - resistance threshold
MW 20x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 20x5 / N38

Table 7: Hazards (implants) - precautionary measures
MW 20x5 / N38

Table 8: Collisions (kinetic energy) - warning
MW 20x5 / N38

Table 9: Anti-corrosion coating durability
MW 20x5 / N38

Table 10: Electrical data (P_c)
MW 20x5 / N38

Table 11: Underwater work (magnet fishing)
MW 20x5 / N38