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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

check parameters »

5.56 ZŁ with VAT / pcs + price for transport

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Technical - 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 - technical parameters

Presented values represent the result of a engineering calculation. Values are based on algorithms for the material Nd₂Fe₁₄B. Real-world parameters may differ from theoretical values. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force 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	medium risk
1 mm	2573 Gs 257.3 mT	5.97 kg / 5975.0 g 58.6 N	medium risk
2 mm	2340 Gs 234.0 mT	4.94 kg / 4940.1 g 48.5 N	medium risk
3 mm	2092 Gs 209.2 mT	3.95 kg / 3948.3 g 38.7 N	medium risk
5 mm	1611 Gs 161.1 mT	2.34 kg / 2343.4 g 23.0 N	medium risk
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

Grip strength weakens drastically with every mm of gap. Note that even a very thin break (e.g., dirt, varnish, dust) significantly reduces the pull force. Magnets operate most effectively at the point of direct contact; distance kills the power. Observe how rapidly the pull force plummet, when the product does not touch directly to the metal substrate. When calculating the arrangement, avoid redundant distances.

Table 2: Sliding force (wall)
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 following data calculates the approximate holding capacity required to initiate the sliding of the magnet vertically on a vertical steel plate (considering standard friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 placing a element on a vertical plane (e.g., a car body), it will maintain only approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that magnets slide down easier than they pop off the substrate. Designing a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter cargo. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 metal plate is unable to take in the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To squeeze 100% of this magnet's power, you require a sufficiently solid backing of metal. The saturation phenomenon means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel thickness based on the following data.

Table 5: Thermal stability (stability) - thermal limit
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 irreversibly lose strength past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's force briefly lowers. Do not use this product near heat sources higher than its working range. Exceeding the critical threshold will result in permanent loss of magnetism.

*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - 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 magnetic products attract each other from a wider radius than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Hazards (implants) - warnings
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
Timepiece	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 serious hazard to electronics and medical implants. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (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 collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. 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 playing with large magnets.

Table 9: Coating parameters (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)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
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 emitted by the pole surface. Key data when building generators as well as sensors. P_c value defines the magnet's operating point.

Table 11: Physics of underwater searching
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%

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

*Caution: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the safety 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 specification and ecology

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: 010044-2025

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MW 4x10 / N38 - cylindrical magnet

0.800 ZŁ brutto / pcs

This product is an incredibly powerful cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø20x5 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 6.93 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening 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 miniature devices 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 immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Magnets N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

This model is characterized by dimensions Ø20x5 mm, which, at a weight of 11.78 g, makes it an element with high magnetic energy density. The value of 67.95 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 external factors, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 5 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 diametrically if your project requires it.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Advantages

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

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
Magnets very well defend themselves against loss of magnetization caused by external fields,
The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
Magnetic induction on the working part of the magnet remains strong,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
Possibility of individual forming as well as adjusting to atypical applications,
Huge importance in modern technologies – they serve a role in magnetic memories, electric motors, advanced medical instruments, also technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of NdFeB magnets:

They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices can be problematic in diagnostics medical in case of swallowing.
Due to complex production process, their price exceeds standard values,

Holding force characteristics

Maximum magnetic pulling force – what affects it?

The declared magnet strength refers to the maximum value, obtained under optimal environment, meaning:

using a base made of high-permeability steel, acting as a ideal flux conductor
with a thickness no less than 10 mm
with a surface perfectly flat
with zero gap (no impurities)
for force acting at a right angle (in the magnet axis)
in temp. approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, mainly (from priority):

Air gap (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and holding force.
Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

Warnings

Magnetic media

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

Danger to pacemakers

For implant holders: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Serious injuries

Danger of trauma: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Magnet fragility

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

No play value

Neodymium magnets are not intended for children. Eating a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.

Do not drill into magnets

Dust created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Magnetic interference

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

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.

Demagnetization risk

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Respect the power

Use magnets with awareness. Their immense force can surprise even professionals. Plan your moves and respect their power.

Attention! Want to know more? Read our article: Are neodymium magnets dangerous?

MW 20x5 / N38 - cylindrical magnet

Technical - 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 - technical parameters

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

Table 2: Sliding force (wall) MW 20x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MW 20x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MW 20x5 / N38

Table 5: Thermal stability (stability) - thermal limit MW 20x5 / N38

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

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

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

Table 9: Coating parameters (durability) MW 20x5 / N38

Table 10: Construction data (Flux) MW 20x5 / N38

Table 11: Physics of underwater searching MW 20x5 / N38

1. Vertical hold

2. Steel saturation

3. Thermal stability

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

Chemical composition

Sustainability

Pulling force

Magnetic Field

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MW 4x10 / N38 - cylindrical magnet

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Limitations

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Magnet lifting force in use – key factors

Warnings

Magnetic media

Danger to pacemakers

Serious injuries

Magnet fragility

No play value

Do not drill into magnets

Magnetic interference

Skin irritation risks

Demagnetization risk

Respect the power

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Sliding force (wall)
MW 20x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 20x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 20x5 / N38

Table 5: Thermal stability (stability) - thermal limit
MW 20x5 / N38

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

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

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

Table 9: Coating parameters (durability)
MW 20x5 / N38

Table 10: Construction data (Flux)
MW 20x5 / N38

Table 11: Physics of underwater searching
MW 20x5 / N38

Advantages and disadvantages of Nd₂Fe₁₄B magnets.