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MW 12x8 / 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 010022

GTIN/EAN: 5906301810216

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

4.93 kg / 48.32 N

Magnetic Induction

495.50 mT / 4955 Gs

Coating

[NiCuNi] Nickel

2.47 ZŁ with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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MW 12x8 / N38 - cylindrical magnet

Specification / characteristics MW 12x8 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010022
GTIN/EAN	5906301810216
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	12 mm [±0,1 mm]
Height	8 mm [±0,1 mm]
Weight	6.79 g
Magnetization Direction	↑ axial
Load capacity ~ ?	4.93 kg / 48.32 N
Magnetic Induction ~ ?	495.50 mT / 4955 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x8 / 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

Physical simulation of the magnet - technical parameters

These values are the direct effect of a engineering simulation. Results rely on algorithms for the material Nd₂Fe₁₄B. Operational performance may differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - interaction chart
MW 12x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4952 Gs 495.2 mT	4.93 kg / 4930.0 g 48.4 N	strong
1 mm	4139 Gs 413.9 mT	3.44 kg / 3445.0 g 33.8 N	strong
2 mm	3356 Gs 335.6 mT	2.26 kg / 2264.2 g 22.2 N	strong
3 mm	2670 Gs 267.0 mT	1.43 kg / 1433.5 g 14.1 N	weak grip
5 mm	1660 Gs 166.0 mT	0.55 kg / 554.1 g 5.4 N	weak grip
10 mm	565 Gs 56.5 mT	0.06 kg / 64.3 g 0.6 N	weak grip
15 mm	243 Gs 24.3 mT	0.01 kg / 11.8 g 0.1 N	weak grip
20 mm	124 Gs 12.4 mT	0.00 kg / 3.1 g 0.0 N	weak grip
30 mm	45 Gs 4.5 mT	0.00 kg / 0.4 g 0.0 N	weak grip
50 mm	11 Gs 1.1 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Magnetic force decreases sharply per each millimeter of gap. Note that even a microscopic distance (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnets hold optimally in perfect adhesion; gap weakens the force. Observe how quickly the parameters fall, when the magnet does not touch flatly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Sliding Load (Vertical Surface)
MW 12x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.99 kg / 986.0 g 9.7 N
1 mm	Stal (~0.2)	0.69 kg / 688.0 g 6.7 N
2 mm	Stal (~0.2)	0.45 kg / 452.0 g 4.4 N
3 mm	Stal (~0.2)	0.29 kg / 286.0 g 2.8 N
5 mm	Stal (~0.2)	0.11 kg / 110.0 g 1.1 N
10 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 2.0 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

This section calculates the theoretical weight limit required to start the sliding of the magnet downwards along a vertical steel plate (assuming typical friction coefficient). This parameter is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 12x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.48 kg / 1479.0 g 14.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.99 kg / 986.0 g 9.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.49 kg / 493.0 g 4.8 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.47 kg / 2465.0 g 24.2 N

When hanging a magnet on a upright surface (e.g., a fridge), it you can count on only approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip cause that products slip easier than they pull off. Planning a wall mount? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a noticeably lighter weight. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 12x8 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.49 kg / 493.0 g 4.8 N
1 mm	25%	1.23 kg / 1232.5 g 12.1 N
2 mm	50%	2.47 kg / 2465.0 g 24.2 N
5 mm	100%	4.93 kg / 4930.0 g 48.4 N
10 mm	100%	4.93 kg / 4930.0 g 48.4 N

A thin metal plate is not enough to focus the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the holding will be smaller. To squeeze 100% of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder works worse. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 12x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	4.93 kg / 4930.0 g 48.4 N	OK
40 °C	-2.2%	4.82 kg / 4821.5 g 47.3 N	OK
60 °C	-4.4%	4.71 kg / 4713.1 g 46.2 N	OK
80 °C	-6.6%	4.60 kg / 4604.6 g 45.2 N
100 °C	-28.8%	3.51 kg / 3510.2 g 34.4 N

Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's power briefly drops. Refrain from using this product close to ovens higher than its working range. Ignoring the limit will result in irreversible degradation of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 12x8 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	17.10 kg / 17097 g 167.7 N 5 795 Gs	N/A
1 mm	14.44 kg / 14437 g 141.6 N 9 101 Gs	12.99 kg / 12993 g 127.5 N ~0 Gs
2 mm	11.95 kg / 11947 g 117.2 N 8 279 Gs	10.75 kg / 10753 g 105.5 N ~0 Gs
3 mm	9.74 kg / 9744 g 95.6 N 7 477 Gs	8.77 kg / 8770 g 86.0 N ~0 Gs
5 mm	6.27 kg / 6269 g 61.5 N 5 997 Gs	5.64 kg / 5642 g 55.3 N ~0 Gs
10 mm	1.92 kg / 1922 g 18.9 N 3 320 Gs	1.73 kg / 1730 g 17.0 N ~0 Gs
20 mm	0.22 kg / 223 g 2.2 N 1 131 Gs	0.20 kg / 201 g 2.0 N ~0 Gs
50 mm	0.00 kg / 4 g 0.0 N 142 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums interact from a much further distance than a neodymium and metal combination. The setup of two magnets produces a massive flux and a wider radius of action. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Protective zones (implants) - precautionary measures
MW 12x8 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Timepiece	20 Gs (2.0 mT)	4.5 cm
Mobile device	40 Gs (4.0 mT)	3.5 cm
Remote	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation is a serious hazard to electronic devices and medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 12x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	27.40 km/h (7.61 m/s)	0.20 J
30 mm	47.07 km/h (13.08 m/s)	0.58 J
50 mm	60.77 km/h (16.88 m/s)	0.97 J
100 mm	85.94 km/h (23.87 m/s)	1.93 J

Neodymium magnets are very brittle – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or injury to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
MW 12x8 / 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: Electrical Data (P_c)
MW 12x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 650 Mx	56.5 µWb
P_c Coefficient	0.71	High (Stable)

Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 12x8 / N38

Environment	Effective steel pull	Effect
Air (land)	4.93 kg	Standard
Water (riverbed)	5.64 kg (+0.71 kg Buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Vertical hold

*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*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) = 0.71

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.

Engineering data and GPSR

Material specification

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: 010022-2025

Measurement Calculator

Magnet Pull Force

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The offered product is an incredibly powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø12x8 mm, guarantees maximum efficiency. The MW 12x8 / N38 model features an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 4.93 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 48.32 N with a weight of only 6.79 g, this rod is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø12x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.

This model is characterized by dimensions Ø12x8 mm, which, at a weight of 6.79 g, makes it an element with impressive magnetic energy density. The value of 48.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.79 g. The product has a [NiCuNi] coating, which protects the surface 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 12 mm. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Strengths

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

Their strength is durable, and after approximately ten years it drops only by ~1% (theoretically),
They are noted for resistance to demagnetization induced by external disturbances,
Thanks to the shimmering finish, the plating of nickel, gold, or silver-plated gives an visually attractive appearance,
They show high magnetic induction at the operating surface, making them more effective,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Thanks to versatility in shaping and the ability to modify to specific needs,
Fundamental importance in electronics industry – they serve a role in mass storage devices, brushless drives, advanced medical instruments, as well as other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Disadvantages

Cons of neodymium magnets: application proposals

To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
Limited ability of producing nuts in the magnet and complicated shapes - preferred is a housing - magnet mounting.
Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

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

The load parameter shown refers to the peak performance, measured under optimal environment, meaning:

using a sheet made of mild steel, functioning as a ideal flux conductor
possessing a massiveness of at least 10 mm to ensure full flux closure
characterized by smoothness
under conditions of no distance (surface-to-surface)
for force applied at a right angle (in the magnet axis)
in neutral thermal conditions

Determinants of lifting force in real conditions

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

Distance – the presence of any layer (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets

Health Danger

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Sensitization to coating

Certain individuals experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in skin redness. We recommend use safety gloves.

Keep away from computers

Powerful magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Respect the power

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

Crushing force

Large magnets can smash fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Swallowing risk

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Dust is flammable

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

Power loss in heat

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Beware of splinters

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them shattering into small pieces.

GPS Danger

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Attention! Details about risks in the article: Magnet Safety Guide.

MW 12x8 / N38 - cylindrical magnet

Can't decide what to choose?

MW 12x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - technical parameters

1. Vertical hold

2. Steel saturation

3. Heat tolerance

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

Material specification

Environmental data

Magnet Pull Force

Field Strength

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Disadvantages

Pull force analysis

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

Determinants of lifting force in real conditions

Health Danger

Sensitization to coating

Keep away from computers

Respect the power

Crushing force

Swallowing risk

Dust is flammable

Power loss in heat

Beware of splinters

GPS Danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.