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MW 70x40 / 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 010097

GTIN: 5906301810964

5.00

Diameter Ø

70 mm [±0,1 mm]

Height

40 mm [±0,1 mm]

Weight

1154.54 g

Magnetization Direction

↑ axial

Load capacity

229.6 kg / 2252.38 N

Magnetic Induction

466.52 mT

Coating

[NiCuNi] Nickel

395.40 ZŁ with VAT / pcs + price for transport

321.46 ZŁ net + 23% VAT / pcs

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MW 70x40 / N38 - cylindrical magnet

Specification / characteristics MW 70x40 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010097
GTIN	5906301810964
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	70 mm [±0,1 mm]
Height	40 mm [±0,1 mm]
Weight	1154.54 g
Magnetization Direction	↑ axial
Load capacity ~ ?	229.6 kg / 2252.38 N
Magnetic Induction ~ ?	466.52 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 70x40 / N38 - cylindrical magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°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 analysis of the product - data

The following values represent the outcome of a mathematical calculation. Values were calculated on algorithms for the class NdFeB. Actual parameters may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 70x40 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4665 Gs 466.5 mT	229.60 kg / 229600.0 g 2252.4 N	critical level
1 mm	4538 Gs 453.8 mT	217.34 kg / 217337.1 g 2132.1 N	critical level
2 mm	4409 Gs 440.9 mT	205.14 kg / 205142.0 g 2012.4 N	critical level
5 mm	4017 Gs 401.7 mT	170.28 kg / 170279.9 g 1670.4 N	critical level
10 mm	3376 Gs 337.6 mT	120.26 kg / 120259.4 g 1179.7 N	critical level
15 mm	2788 Gs 278.8 mT	82.04 kg / 82041.4 g 804.8 N	critical level
20 mm	2279 Gs 227.9 mT	54.82 kg / 54821.6 g 537.8 N	critical level
30 mm	1511 Gs 151.1 mT	24.08 kg / 24076.2 g 236.2 N	critical level
50 mm	699 Gs 69.9 mT	5.16 kg / 5158.4 g 50.6 N	strong

Grip strength weakens significantly with every mm of distance. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Magnets operate most effectively during direct contact; distance weakens the force. See how quickly the parameters plummet, when the product does not adhere flatly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Vertical assembly (shearing) - behavior on slippery surfaces
MW 70x40 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	68.88 kg / 68880.0 g 675.7 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	45.92 kg / 45920.0 g 450.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	22.96 kg / 22960.0 g 225.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	114.80 kg / 114800.0 g 1126.2 N

When hanging a holder on a vertical wall (e.g., a car body), it will maintain just approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip cause that holders move down faster than they pull off. Planning a vertical fastening? Note that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter cargo. Application of an anti-slip layer can drastically increase the grip.

Table 3: Steel thickness (saturation) - power losses
MW 70x40 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	7.65 kg / 7653.3 g 75.1 N
1 mm	8%	19.13 kg / 19133.3 g 187.7 N
2 mm	17%	38.27 kg / 38266.7 g 375.4 N
5 mm	42%	95.67 kg / 95666.7 g 938.5 N
10 mm	83%	191.33 kg / 191333.3 g 1877.0 N

A thin sheet is not enough to focus the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you need a suitably thick backing of metal. The material oversaturation means that on thin elements (e.g., car bodies), the product holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 4: Thermal stability (stability) - power drop
MW 70x40 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	229.60 kg / 229600.0 g 2252.4 N	OK
40 °C	-2.2%	224.55 kg / 224548.8 g 2202.8 N	OK
60 °C	-4.4%	219.50 kg / 219497.6 g 2153.3 N	OK
80 °C	-6.6%	214.45 kg / 214446.4 g 2103.7 N
100 °C	-28.8%	163.48 kg / 163475.2 g 1603.7 N

Standard neodymium magnets change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this product. With every degree above norm, the neodymium's force temporarily decreases. Avoid using this magnet in hot environments higher than its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetic properties.

Table 5: Magnet-Magnet interaction (repulsion) - forces in the system
MW 70x40 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	344.40 kg / 344400.0 g 3378.6 N	N/A
2 mm	307.71 kg / 307710.0 g 3018.6 N	287.20 kg / 287196.0 g 2817.4 N
5 mm	255.42 kg / 255420.0 g 2505.7 N	238.39 kg / 238392.0 g 2338.6 N
10 mm	180.39 kg / 180390.0 g 1769.6 N	168.36 kg / 168364.0 g 1651.7 N
20 mm	82.23 kg / 82230.0 g 806.7 N	76.75 kg / 76748.0 g 752.9 N
50 mm	7.74 kg / 7740.0 g 75.9 N	7.22 kg / 7224.0 g 70.9 N

Two magnetic products attract each other from a wider radius than a magnet and steel combination. The setup of two magnets generates a stronger field and a larger range of operation. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the impact force is massive. The levitation is a bit weaker than the connection force, but still large.

Table 6: Safety (HSE) (electronics) - precautionary measures
MW 70x40 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	37.5 cm
Hearing aid	10 Gs (1.0 mT)	29.5 cm
Timepiece	20 Gs (2.0 mT)	23.0 cm
Mobile device	40 Gs (4.0 mT)	17.5 cm
Car key	50 Gs (5.0 mT)	16.5 cm
Payment card	400 Gs (40.0 mT)	7.0 cm
HDD hard drive	600 Gs (60.0 mT)	5.5 cm

Extremely neodym field is a real danger to electronic devices and medical implants. These magnets generate a flux that disrupts operation of sensitive medical devices. Notice: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 7: Collisions (kinetic energy) - warning
MW 70x40 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.29 km/h (5.08 m/s)	14.91 J
30 mm	26.20 km/h (7.28 m/s)	30.57 J
50 mm	32.25 km/h (8.96 m/s)	46.31 J
100 mm	45.01 km/h (12.50 m/s)	90.23 J

Neodymium magnets are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling with powerful specimens.

Table 8: Surface protection spec
MW 70x40 / 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. Note the thickness of the protective layer.

Table 9: Hydrostatics and buoyancy
MW 70x40 / N38

Environment	Effective steel pull	Effect
Air (land)	229.60 kg	Standard
Water (riverbed)	262.89 kg (+33.29 kg Buoyancy gain)	+14.5%

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

The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

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The presented product is an incredibly powerful cylindrical magnet, manufactured from modern NdFeB material, which, at dimensions of Ø70x40 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 229.6 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 2252.38 N with a weight of only 1154.54 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 professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Magnets NdFeB grade N38 are suitable for the majority 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 (Ø70x40), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø70x40 mm, which, at a weight of 1154.54 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 229.6 kg (force ~2252.38 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.

This cylinder is magnetized axially (along the height of 40 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.

Strengths as well as weaknesses of neodymium magnets.

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

They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
Neodymium magnets are characterized by highly resistant to loss of magnetic properties caused by external field sources,
The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
Magnets possess maximum magnetic induction on the outer side,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to the potential of free shaping and adaptation to unique projects, NdFeB magnets can be modeled in a wide range of geometric configurations, which amplifies use scope,
Universal use in modern technologies – they are used in magnetic memories, electric drive systems, precision medical tools, and technologically advanced constructions.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

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

They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these devices are able to be problematic in diagnostics medical after entering the body.
Due to complex production process, their price exceeds standard values,

Maximum magnetic pulling force – what it depends on?

Holding force of 229.6 kg is a measurement result executed under the following configuration:

using a base made of high-permeability steel, serving as a magnetic yoke
whose transverse dimension equals approx. 10 mm
characterized by smoothness
under conditions of no distance (surface-to-surface)
during detachment in a direction perpendicular to the mounting surface
in temp. approx. 20°C

Lifting capacity in real conditions – factors

Please note that the application force will differ subject to elements below, in order of importance:

Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets

Allergic reactions

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact or choose coated magnets.

Operating temperature

Keep cool. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Danger to pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Dust explosion hazard

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Keep away from electronics

An intense magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a device to prevent damaging the sensors.

This is not a toy

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.

Crushing risk

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Immense force

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Caution!

Learn more about risks in the article: Magnet Safety Guide.

MW 70x40 / N38 - cylindrical magnet

MW 70x40 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - data

Other products

MW 5x5 / N38 - cylindrical magnet

UMH 36x8x46 [M6] / N38 - magnetic holder with hook

MPL 25x12.5x5 / N38 - lamellar magnet

MW 12x2 / N38 - cylindrical magnet

Strengths as well as weaknesses of neodymium magnets.

Maximum magnetic pulling force – what it depends on?

Lifting capacity in real conditions – factors

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C