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MW 8x20 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010475

GTIN/EAN: 5906301811138

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

1.30 kg / 12.71 N

Magnetic Induction

607.01 mT / 6070 Gs

Coating

[NiCuNi] Nickel

4.60 ZŁ with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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MW 8x20 / N38 - cylindrical magnet

Specification / characteristics MW 8x20 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010475
GTIN/EAN	5906301811138
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter Ø	8 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	7.54 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	1.30 kg / 12.71 N
Magnetic Induction ~ ?	607.01 mT / 6070 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / N38 - cylindrical magnet

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

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Engineering simulation of the product - technical parameters

These values constitute the outcome of a mathematical analysis. Values were calculated on models for the material Nd₂Fe₁₄B. Operational conditions may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - characteristics
MW 8x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6064 Gs 606.4 mT	1.30 kg / 1300.0 g 12.8 N	safe
1 mm	4587 Gs 458.7 mT	0.74 kg / 743.7 g 7.3 N	safe
2 mm	3327 Gs 332.7 mT	0.39 kg / 391.4 g 3.8 N	safe
3 mm	2388 Gs 238.8 mT	0.20 kg / 201.6 g 2.0 N	safe
5 mm	1281 Gs 128.1 mT	0.06 kg / 58.0 g 0.6 N	safe
10 mm	389 Gs 38.9 mT	0.01 kg / 5.4 g 0.1 N	safe
15 mm	169 Gs 16.9 mT	0.00 kg / 1.0 g 0.0 N	safe
20 mm	90 Gs 9.0 mT	0.00 kg / 0.3 g 0.0 N	safe
30 mm	35 Gs 3.5 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	safe

Pulling power drops drastically with every mm of distance. Remember that every additional insulation layer (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnets operate strongest at the point of direct contact; gap nullifies the force. See how quickly the parameters drop, when the product does not adhere flatly to the steel surface. When calculating the assembly, avoid redundant distances.

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

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.26 kg / 260.0 g 2.6 N
1 mm	Stal (~0.2)	0.15 kg / 148.0 g 1.5 N
2 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
3 mm	Stal (~0.2)	0.04 kg / 40.0 g 0.4 N
5 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below presents the estimated shear load necessary to start the slippage of the magnet downwards against a vertical steel wall (assuming typical friction). This value depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 8x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.39 kg / 390.0 g 3.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.26 kg / 260.0 g 2.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.13 kg / 130.0 g 1.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.65 kg / 650.0 g 6.4 N

When mounting a magnet on a vertical plane (e.g., a board), it you can count on only about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip cause that magnets slide down easier than they pull off. Designing a hanger? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slide down under a much lighter cargo. Utilizing a rubberized pad can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 8x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.13 kg / 130.0 g 1.3 N
1 mm	25%	0.33 kg / 325.0 g 3.2 N
2 mm	50%	0.65 kg / 650.0 g 6.4 N
5 mm	100%	1.30 kg / 1300.0 g 12.8 N
10 mm	100%	1.30 kg / 1300.0 g 12.8 N

A thin sheet is incapable of conduct the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the flux will pass right through and the holding will be smaller. To achieve 100% of this neodymium's potential, you require a sufficiently solid element of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the magnet holds weaker. We suggest choosing the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MW 8x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.30 kg / 1300.0 g 12.8 N	OK
40 °C	-2.2%	1.27 kg / 1271.4 g 12.5 N	OK
60 °C	-4.4%	1.24 kg / 1242.8 g 12.2 N	OK
80 °C	-6.6%	1.21 kg / 1214.2 g 11.9 N
100 °C	-28.8%	0.93 kg / 925.6 g 9.1 N

Classic neodymiums irreversibly lose strength past the thermal threshold. Protect against heat – heat can irreversibly damage this product. As the temperature rises, the magnet's capacity temporarily lowers. Do not use this product close to heaters higher than its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.

*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization 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: Two magnets (attraction) - field collision
MW 8x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	11.40 kg / 11396 g 111.8 N 6 154 Gs	N/A
1 mm	8.76 kg / 8758 g 85.9 N 10 632 Gs	7.88 kg / 7882 g 77.3 N ~0 Gs
2 mm	6.52 kg / 6520 g 64.0 N 9 174 Gs	5.87 kg / 5868 g 57.6 N ~0 Gs
3 mm	4.76 kg / 4758 g 46.7 N 7 837 Gs	4.28 kg / 4282 g 42.0 N ~0 Gs
5 mm	2.46 kg / 2461 g 24.1 N 5 637 Gs	2.22 kg / 2215 g 21.7 N ~0 Gs
10 mm	0.51 kg / 508 g 5.0 N 2 561 Gs	0.46 kg / 457 g 4.5 N ~0 Gs
20 mm	0.05 kg / 47 g 0.5 N 778 Gs	0.04 kg / 42 g 0.4 N ~0 Gs
50 mm	0.00 kg / 1 g 0.0 N 107 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products attract each other from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Hazards (electronics) - precautionary measures
MW 8x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.5 cm
Hearing aid	10 Gs (1.0 mT)	5.0 cm
Mechanical watch	20 Gs (2.0 mT)	4.0 cm
Mobile device	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field is a large risk to IT equipment and pacemakers. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

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

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	13.28 km/h (3.69 m/s)	0.05 J
30 mm	22.94 km/h (6.37 m/s)	0.15 J
50 mm	29.61 km/h (8.23 m/s)	0.26 J
100 mm	41.88 km/h (11.63 m/s)	0.51 J

NdFeB products are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MW 8x20 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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

Parameter	Value	SI Unit / Description
Magnetic Flux	3 457 Mx	34.6 µWb
P_c Coefficient	1.31	High (Stable)

Total magnetic flux emitted by the magnet pole. Essential parameter for generator designers and motors. The P_c coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 8x20 / N38

Environment	Effective steel pull	Effect
Air (land)	1.30 kg	Standard
Water (riverbed)	1.49 kg (+0.19 kg Buoyancy gain)	+14.5%

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

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

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the critical limit is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%

Environmental data

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 010475-2025

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The offered product is a very strong rod magnet, produced from durable NdFeB material, which, with dimensions of Ø8x20 mm, guarantees the highest energy density. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 1.30 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 12.71 N with a weight of only 7.54 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.

Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Magnets N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 1.30 kg (force ~12.71 N), which, with such compact dimensions, proves the high grade of the NdFeB material. 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 8 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 Nd₂Fe₁₄B magnets.

Benefits

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

They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
Magnets perfectly protect themselves against demagnetization caused by external fields,
A magnet with a metallic silver surface is more attractive,
They show high magnetic induction at the operating surface, which improves attraction properties,
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...
In view of the ability of precise forming and customization to individualized projects, neodymium magnets can be manufactured in a variety of geometric configurations, which increases their versatility,
Fundamental importance in advanced technology sectors – they are commonly used in magnetic memories, drive modules, advanced medical instruments, also multitasking production systems.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets: application proposals

To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Due to limitations in creating nuts and complicated shapes in magnets, we propose using casing - magnetic holder.
Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
Due to expensive raw materials, their price is higher than average,

Lifting parameters

Magnetic strength at its maximum – what affects it?

The specified lifting capacity refers to the limit force, measured under ideal test conditions, namely:

using a base made of low-carbon steel, acting as a circuit closing element
with a cross-section minimum 10 mm
characterized by smoothness
without the slightest clearance between the magnet and steel
for force applied at a right angle (pull-off, not shear)
at ambient temperature room level

Lifting capacity in real conditions – factors

Real force is influenced by specific conditions, mainly (from most important):

Clearance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
Steel grade – the best choice is pure iron steel. Cast iron may attract less.
Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Machining danger

Machining of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Danger to pacemakers

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Eye protection

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them breaking into shards.

Heat sensitivity

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

GPS and phone interference

An intense magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Keep magnets close to a smartphone to prevent damaging the sensors.

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact and choose encased magnets.

Immense force

Exercise caution. Neodymium magnets act from a distance and connect with massive power, often faster than you can move away.

Do not give to children

Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Serious injuries

Big blocks can smash fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

Magnetic media

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

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

MW 8x20 / N38 - cylindrical magnet

Not sure what to buy?

MW 8x20 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the product - technical parameters

1. Wall mount (shear)

2. Steel saturation

3. Power loss vs temp

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Induction

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Pros and cons of Nd2Fe14B magnets.

Benefits

Disadvantages

Lifting parameters

Magnetic strength at its maximum – what affects it?

Lifting capacity in real conditions – factors

Machining danger

Danger to pacemakers

Eye protection

Heat sensitivity

GPS and phone interference

Warning for allergy sufferers

Immense force

Do not give to children

Serious injuries

Magnetic media

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.