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MW 4x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010075

GTIN: 5906301810742

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

0.94 g

Magnetization Direction

↑ axial

Load capacity

0.75 kg / 7.38 N

Magnetic Induction

606.05 mT

Coating

[NiCuNi] Nickel

0.800 ZŁ with VAT / pcs + price for transport

0.650 ZŁ net + 23% VAT / pcs

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MW 4x10 / N38 - cylindrical magnet

Specification / characteristics MW 4x10 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010075
GTIN	5906301810742
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	4 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	0.94 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.75 kg / 7.38 N
Magnetic Induction ~ ?	606.05 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x10 / 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

Engineering modeling of the assembly - data

These values constitute the outcome of a physical simulation. Values were calculated on algorithms for the material NdFeB. Actual performance may deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MW 4x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6049 Gs 604.9 mT	0.75 kg / 750.0 g 7.4 N	low risk
1 mm	3327 Gs 332.7 mT	0.23 kg / 226.9 g 2.2 N	low risk
2 mm	1732 Gs 173.2 mT	0.06 kg / 61.5 g 0.6 N	low risk
5 mm	389 Gs 38.9 mT	0.00 kg / 3.1 g 0.0 N	low risk
10 mm	90 Gs 9.0 mT	0.00 kg / 0.2 g 0.0 N	low risk
15 mm	35 Gs 3.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
20 mm	17 Gs 1.7 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	6 Gs 0.6 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	2 Gs 0.2 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power decreases significantly with every mm of distance. Note that every additional insulation layer (e.g., dirt, paint, veneer) significantly reduces the pull force. Neodymiums operate strongest in perfect adhesion; air break drastically cuts the force. Observe how quickly the pull force drop, when the magnet does not adhere tightly to the steel surface. When planning the assembly, discard additional spacers.

Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 4x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.22 kg / 225.0 g 2.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.15 kg / 150.0 g 1.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.08 kg / 75.0 g 0.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.38 kg / 375.0 g 3.7 N

When mounting a element on a vertical plane (e.g., a fridge), it will only hold only about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slide down faster than they pop off the substrate. Planning a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will slide down under a much lighter cargo. Application of an anti-slip pad can significantly raise the stability.

Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 4x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.08 kg / 75.0 g 0.7 N
1 mm	25%	0.19 kg / 187.5 g 1.8 N
2 mm	50%	0.38 kg / 375.0 g 3.7 N
5 mm	100%	0.75 kg / 750.0 g 7.4 N
10 mm	100%	0.75 kg / 750.0 g 7.4 N

A too thin steel is not enough to absorb the full magnetic flux, which weakens actual performance of the magnet. Should you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on delicate walls (e.g., car bodies), the product shows lower pull force. We advise picking the steel thickness based on the following data.

Table 4: Thermal resistance (stability) - power drop
MW 4x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.75 kg / 750.0 g 7.4 N	OK
40 °C	-2.2%	0.73 kg / 733.5 g 7.2 N	OK
60 °C	-4.4%	0.72 kg / 717.0 g 7.0 N	OK
80 °C	-6.6%	0.70 kg / 700.5 g 6.9 N
100 °C	-28.8%	0.53 kg / 534.0 g 5.2 N

Ordinary NdFeB products lose power past the thermal threshold. Avoid high temperatures – heat can permanently destroy this magnet. With increasing heat, the neodymium's power temporarily drops. Refrain from using this magnet close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetic properties.

Table 5: Two magnets (attraction) - forces in the system
MW 4x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	1.13 kg / 1125.0 g 11.0 N	N/A
2 mm	0.09 kg / 90.0 g 0.9 N	0.08 kg / 84.0 g 0.8 N
5 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
10 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
20 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of performance. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is huge. The repulsion force is a bit weaker than the attraction, but still impressive.

Table 6: Safety (HSE) (electronics) - precautionary measures
MW 4x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	3.5 cm
Hearing aid	10 Gs (1.0 mT)	2.5 cm
Timepiece	20 Gs (2.0 mT)	2.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	1.5 cm
Car key	50 Gs (5.0 mT)	1.5 cm
Payment card	400 Gs (40.0 mT)	0.5 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

Extremely neodym field poses a real danger to electronics as well as pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 7: Collisions (kinetic energy) - collision effects
MW 4x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	28.49 km/h (7.91 m/s)	0.03 J
30 mm	49.34 km/h (13.71 m/s)	0.09 J
50 mm	63.70 km/h (17.69 m/s)	0.15 J
100 mm	90.08 km/h (25.02 m/s)	0.29 J

Neodymium magnets are prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when handling with large magnets.

Table 8: Corrosion resistance
MW 4x10 / 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 9: Submerged application
MW 4x10 / N38

Environment	Effective steel pull	Effect
Air (land)	0.75 kg	Standard
Water (riverbed)	0.86 kg (+0.11 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

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This product is an extremely powerful cylinder magnet, manufactured from modern NdFeB material, which, at dimensions of Ø4x10 mm, guarantees maximum efficiency. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.75 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 effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 7.38 N with a weight of only 0.94 g, this rod is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø4x10), 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 Ø4x10 mm, which, at a weight of 0.94 g, makes it an element with impressive magnetic energy density. The value of 7.38 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.94 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Strengths and weaknesses of rare earth magnets.

Apart from their notable magnetism, neodymium magnets have these key benefits:

They do not lose magnetism, even over nearly 10 years – the drop in strength is only ~1% (according to tests),
Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external interference,
By covering with a shiny coating of silver, the element presents an elegant look,
They feature high magnetic induction at the operating surface, which improves attraction properties,
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 modularity in designing and the ability to modify to complex applications,
Significant place in electronics industry – they are commonly used in HDD drives, brushless drives, advanced medical instruments, and complex engineering applications.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
We suggest cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a result of laboratory testing conducted under specific, ideal conditions:

using a plate made of mild steel, functioning as a magnetic yoke
whose thickness equals approx. 10 mm
characterized by lack of roughness
under conditions of gap-free contact (surface-to-surface)
during pulling in a direction perpendicular to the plane
in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower subject to the following factors, in order of importance:

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
Direction of force – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal 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’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets

Protective goggles

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Combustion hazard

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Heat warning

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

ICD Warning

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Physical harm

Watch your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Swallowing risk

These products are not suitable for play. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

GPS Danger

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Metal Allergy

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in dermatitis. It is best to use safety gloves.

Do not underestimate power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Cards and drives

Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Attention!

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

MW 4x10 / N38 - cylindrical magnet

MW 4x10 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

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Strengths and weaknesses of rare earth magnets.

Maximum lifting capacity of the magnet – what contributes to it?

Practical lifting capacity: influencing factors

Safety rules for work with NdFeB magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C