Product available Ships tomorrow

MW 8x3 / 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 010103

GTIN/EAN: 5906301811022

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.13 g

Magnetization Direction

↑ axial

Load capacity

1.70 kg / 16.67 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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MW 8x3 / N38 - cylindrical magnet

Specification / characteristics MW 8x3 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010103
GTIN/EAN	5906301811022
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	3 mm [±0,1 mm]
Weight	1.13 g
Magnetization Direction	↑ axial
Load capacity ~ ?	1.70 kg / 16.67 N
Magnetic Induction ~ ?	371.53 mT / 3715 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x3 / 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 analysis of the magnet - technical parameters

Presented values constitute the result of a physical analysis. Values rely on algorithms for the material Nd₂Fe₁₄B. Actual performance may differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (force vs distance) - power drop
MW 8x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3712 Gs 371.2 mT	1.70 kg / 1700.0 g 16.7 N	weak grip
1 mm	2880 Gs 288.0 mT	1.02 kg / 1023.3 g 10.0 N	weak grip
2 mm	2069 Gs 206.9 mT	0.53 kg / 527.9 g 5.2 N	weak grip
3 mm	1439 Gs 143.9 mT	0.26 kg / 255.3 g 2.5 N	weak grip
5 mm	704 Gs 70.4 mT	0.06 kg / 61.1 g 0.6 N	weak grip
10 mm	169 Gs 16.9 mT	0.00 kg / 3.5 g 0.0 N	weak grip
15 mm	62 Gs 6.2 mT	0.00 kg / 0.5 g 0.0 N	weak grip
20 mm	29 Gs 2.9 mT	0.00 kg / 0.1 g 0.0 N	weak grip
30 mm	9 Gs 0.9 mT	0.00 kg / 0.0 g 0.0 N	weak grip
50 mm	2 Gs 0.2 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Grip strength decreases significantly with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, dust) noticeably reduces the pull force. Neodymiums work most effectively at the point of direct contact; gap nullifies the force. Analyze how rapidly the pull force plummet, when the product does not touch flatly to the metal substrate. When planning the mounting, discard additional spacers.

Table 2: Shear hold (vertical surface)
MW 8x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.34 kg / 340.0 g 3.3 N
1 mm	Stal (~0.2)	0.20 kg / 204.0 g 2.0 N
2 mm	Stal (~0.2)	0.11 kg / 106.0 g 1.0 N
3 mm	Stal (~0.2)	0.05 kg / 52.0 g 0.5 N
5 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 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 defines the approximate holding capacity needed to start the shifting of the magnet vertically against a upright metal surface (assuming typical friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 8x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.51 kg / 510.0 g 5.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.34 kg / 340.0 g 3.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.17 kg / 170.0 g 1.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.85 kg / 850.0 g 8.3 N

When placing a holder on a upright wall (e.g., a car body), it will only hold just approx. 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient mean that products slide down faster than they pull off. Planning a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter load. Application of an anti-slip layer can significantly improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.17 kg / 170.0 g 1.7 N
1 mm	25%	0.43 kg / 425.0 g 4.2 N
2 mm	50%	0.85 kg / 850.0 g 8.3 N
5 mm	100%	1.70 kg / 1700.0 g 16.7 N
10 mm	100%	1.70 kg / 1700.0 g 16.7 N

A thin sheet is unable to focus the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the field will penetrate right through and the attraction force will be weaker. To achieve the maximum of this magnet's power, you need a suitably thick piece of metal. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MW 8x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.70 kg / 1700.0 g 16.7 N	OK
40 °C	-2.2%	1.66 kg / 1662.6 g 16.3 N	OK
60 °C	-4.4%	1.63 kg / 1625.2 g 15.9 N
80 °C	-6.6%	1.59 kg / 1587.8 g 15.6 N
100 °C	-28.8%	1.21 kg / 1210.4 g 11.9 N

Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly demagnetize this magnet. As the temperature rises, the magnet's power briefly decreases. Avoid using this magnet in hot environments higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetism.

*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 8x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.27 kg / 4271 g 41.9 N 5 146 Gs	N/A
1 mm	3.40 kg / 3403 g 33.4 N 6 627 Gs	3.06 kg / 3063 g 30.0 N ~0 Gs
2 mm	2.57 kg / 2571 g 25.2 N 5 761 Gs	2.31 kg / 2314 g 22.7 N ~0 Gs
3 mm	1.87 kg / 1871 g 18.4 N 4 914 Gs	1.68 kg / 1684 g 16.5 N ~0 Gs
5 mm	0.93 kg / 926 g 9.1 N 3 456 Gs	0.83 kg / 833 g 8.2 N ~0 Gs
10 mm	0.15 kg / 154 g 1.5 N 1 408 Gs	0.14 kg / 138 g 1.4 N ~0 Gs
20 mm	0.01 kg / 9 g 0.1 N 339 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 31 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums interact from a much further distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a wider radius of action. Designing a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 8x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	4.0 cm
Hearing aid	10 Gs (1.0 mT)	3.0 cm
Timepiece	20 Gs (2.0 mT)	2.5 cm
Mobile device	40 Gs (4.0 mT)	2.0 cm
Remote	50 Gs (5.0 mT)	2.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation is a real danger to electronic devices and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 8x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	39.17 km/h (10.88 m/s)	0.07 J
30 mm	67.75 km/h (18.82 m/s)	0.20 J
50 mm	87.47 km/h (24.30 m/s)	0.33 J
100 mm	123.70 km/h (34.36 m/s)	0.67 J

Neodymium magnets are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MW 8x3 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MW 8x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	1 946 Mx	19.5 µWb
P_c Coefficient	0.48	Low (Flat)

Flux value emitted by the magnet pole. Key data when building generators and motors. P_c value determines the working geometry.

Table 11: Physics of underwater searching
MW 8x3 / N38

Environment	Effective steel pull	Effect
Air (land)	1.70 kg	Standard
Water (riverbed)	1.95 kg (+0.25 kg Buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.48

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 specification and ecology

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: 010103-2025

Magnet Unit Converter

Magnet pull force

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MP 62x42x25 / N38 - ring magnet

165.00 ZŁ brutto / pcs

This product is an exceptionally strong cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø8x3 mm, guarantees optimal power. The MW 8x3 / N38 model features an accuracy of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.70 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 16.67 N with a weight of only 1.13 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.

Due to the delicate structure of the ceramic sinter, we absolutely advise against 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 are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø8x3), 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 8 mm and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 1.70 kg (force ~16.67 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 oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 3 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.

Pros and cons of neodymium magnets.

Strengths

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
A magnet with a smooth gold surface is more attractive,
Magnetic induction on the top side of the magnet is exceptional,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Thanks to the possibility of precise forming and adaptation to individualized needs, magnetic components can be created in a variety of forms and dimensions, which makes them more universal,
Significant place in high-tech industry – they are used in mass storage devices, electric motors, medical devices, and modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Disadvantages

What to avoid - cons of neodymium magnets: tips and applications.

To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
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 and corrosion.
Limited possibility of producing threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a measurement result conducted under the following configuration:

on a block made of structural steel, perfectly concentrating the magnetic flux
whose transverse dimension reaches at least 10 mm
with an ground touching surface
under conditions of ideal adhesion (surface-to-surface)
during detachment in a direction vertical to the mounting surface
at temperature room level

Determinants of practical lifting force of a magnet

Please note that the working load will differ influenced by elements below, starting with the most relevant:

Distance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be escaped to the other side.
Steel type – mild steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.

H&S for magnets

Warning for heart patients

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Serious injuries

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

Magnets are brittle

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into shards.

Magnetic media

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Immense force

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and choose encased magnets.

Adults only

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store out of reach of children and animals.

Dust is flammable

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Operating temperature

Avoid heat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Precision electronics

Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, tablet, and GPS.

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

MW 8x3 / N38 - cylindrical magnet

Do you have trouble choosing?

MW 8x3 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the magnet - technical parameters

1. Vertical hold

2. Steel thickness impact

3. Temperature resistance

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

Material specification

Environmental data

Magnet pull force

Magnetic Field

Other proposals

MW 15x10 / N38 - cylindrical magnet

UMH 48x11x65 [M6] / N38 - magnetic holder with hook

MW 70x40 / N38 - cylindrical magnet

MP 62x42x25 / N38 - ring magnet

Pros and cons of neodymium magnets.

Strengths

Disadvantages

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

Determinants of practical lifting force of a magnet

Warning for heart patients

Serious injuries

Magnets are brittle

Magnetic media

Immense force

Metal Allergy

Adults only

Dust is flammable

Operating temperature

Precision electronics

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C