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MW 4x8 / 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 010079

GTIN/EAN: 5906301810780

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

0.75 g

Magnetization Direction

↑ axial

Load capacity

0.35 kg / 3.48 N

Magnetic Induction

599.59 mT / 5996 Gs

Coating

[NiCuNi] Nickel

view specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 4x8 / N38 - cylindrical magnet

Specification / characteristics - MW 4x8 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010079
GTIN/EAN	5906301810780
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	8 mm [±0,1 mm]
Weight	0.75 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.35 kg / 3.48 N
Magnetic Induction ~ ?	599.59 mT / 5996 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x8 / 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 assembly - technical parameters

The following values represent the result of a engineering calculation. Values rely on models for the class Nd₂Fe₁₄B. Actual performance might slightly deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 4x8 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5984 Gs 598.4 mT	0.35 kg / 350.0 g 3.4 N	low risk
1 mm	3280 Gs 328.0 mT	0.11 kg / 105.1 g 1.0 N	low risk
2 mm	1696 Gs 169.6 mT	0.03 kg / 28.1 g 0.3 N	low risk
3 mm	941 Gs 94.1 mT	0.01 kg / 8.7 g 0.1 N	low risk
5 mm	371 Gs 37.1 mT	0.00 kg / 1.3 g 0.0 N	low risk
10 mm	82 Gs 8.2 mT	0.00 kg / 0.1 g 0.0 N	low risk
15 mm	31 Gs 3.1 mT	0.00 kg / 0.0 g 0.0 N	low risk
20 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power drops drastically with every mm of gap. Note that even a very thin break (e.g., dirt, paint, dust) significantly reduces the pull force. Magnets work strongest in perfect adhesion; air break kills the power. Notice how flashily the parameters fall, when the product does not adhere flatly to the metal substrate. When calculating the mounting, avoid unnecessary gaps.

Table 2: Slippage load (vertical surface)
MW 4x8 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.07 kg / 70.0 g 0.7 N
1 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
2 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
5 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 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 following data shows the approximate weight limit necessary to initiate the sliding of the magnet vertically along a upright steel wall (considering standard friction coefficient). This value is relative to the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 4x8 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.11 kg / 105.0 g 1.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.07 kg / 70.0 g 0.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.03 kg / 35.0 g 0.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.18 kg / 175.0 g 1.7 N

When mounting a element on a vertical wall (e.g., a board), it will only hold only about 20%-30% of its maximum pull force. Gravity and a weak degree of grip cause that holders move down easier than they pull off. Want to create a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter weight. Application of an anti-slip coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 4x8 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.03 kg / 35.0 g 0.3 N
1 mm	25%	0.09 kg / 87.5 g 0.9 N
2 mm	50%	0.18 kg / 175.0 g 1.7 N
5 mm	100%	0.35 kg / 350.0 g 3.4 N
10 mm	100%	0.35 kg / 350.0 g 3.4 N

A thin sheet is incapable of conduct the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To achieve the maximum of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - power drop
MW 4x8 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.35 kg / 350.0 g 3.4 N	OK
40 °C	-2.2%	0.34 kg / 342.3 g 3.4 N	OK
60 °C	-4.4%	0.33 kg / 334.6 g 3.3 N	OK
80 °C	-6.6%	0.33 kg / 326.9 g 3.2 N
100 °C	-28.8%	0.25 kg / 249.2 g 2.4 N

Classic neodymiums change their properties power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's force briefly lowers. Do not use this magnet in hot environments exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.

*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 4x8 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.77 kg / 2774 g 27.2 N 6 121 Gs	N/A
1 mm	1.59 kg / 1591 g 15.6 N 9 063 Gs	1.43 kg / 1432 g 14.0 N ~0 Gs
2 mm	0.83 kg / 833 g 8.2 N 6 559 Gs	0.75 kg / 750 g 7.4 N ~0 Gs
3 mm	0.43 kg / 427 g 4.2 N 4 694 Gs	0.38 kg / 384 g 3.8 N ~0 Gs
5 mm	0.12 kg / 121 g 1.2 N 2 498 Gs	0.11 kg / 109 g 1.1 N ~0 Gs
10 mm	0.01 kg / 11 g 0.1 N 743 Gs	0.01 kg / 10 g 0.1 N ~0 Gs
20 mm	0.00 kg / 1 g 0.0 N 165 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 17 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets produces a massive flux and a wider radius of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).

Table 7: Safety (HSE) (implants) - warnings
MW 4x8 / 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
Mechanical watch	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

A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MW 4x8 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	21.79 km/h (6.05 m/s)	0.01 J
30 mm	37.74 km/h (10.48 m/s)	0.04 J
50 mm	48.72 km/h (13.53 m/s)	0.07 J
100 mm	68.89 km/h (19.14 m/s)	0.14 J

Magnetic elements are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MW 4x8 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (P_c)
MW 4x8 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	836 Mx	8.4 µWb
P_c Coefficient	1.21	High (Stable)

Flux value emitted by the pole surface. Key data for generator designers as well as sensors. P_c value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 4x8 / N38

Environment	Effective steel pull	Effect
Air (land)	0.35 kg	Standard
Water (riverbed)	0.40 kg (+0.05 kg Buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.21

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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

Elemental analysis

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: 010079-2025

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This product is a very strong rod magnet, made from durable NdFeB material, which, at dimensions of Ø4x8 mm, guarantees optimal power. The MW 4x8 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.35 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 3.48 N with a weight of only 0.75 g, this rod is indispensable in miniature devices and wherever every gram matters.

Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Magnets N38 are suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø4x8), 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 Ø4x8 mm, which, at a weight of 0.75 g, makes it an element with impressive magnetic energy density. The value of 3.48 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.75 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 8 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.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Benefits

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
They are noted for resistance to demagnetization induced by presence of other magnetic fields,
By covering with a reflective layer of silver, the element presents an proper look,
The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of custom shaping and optimizing to concrete requirements,
Wide application in advanced technology sectors – they are commonly used in mass storage devices, electromotive mechanisms, advanced medical instruments, also modern systems.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in small systems

Disadvantages

Cons of neodymium magnets and proposals for their use:

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises 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.
They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited possibility of producing threads in the magnet and complex shapes - preferred is a housing - magnet mounting.
Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Breakaway force was defined for optimal configuration, including:

using a plate made of low-carbon steel, functioning as a ideal flux conductor
whose thickness equals approx. 10 mm
characterized by lack of roughness
under conditions of no distance (metal-to-metal)
under vertical force direction (90-degree angle)
at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force depends on several key aspects, presented from the most important:

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and lifting capacity.
Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the holding force.

Safe handling of neodymium magnets

Respect the power

Handle magnets consciously. Their powerful strength can surprise even experienced users. Stay alert and do not underestimate their power.

Keep away from children

Adult use only. Tiny parts can be swallowed, leading to severe trauma. Keep away from kids and pets.

Crushing risk

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or choose encased magnets.

Data carriers

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can permanently damage these devices and erase data from cards.

GPS Danger

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.

Combustion hazard

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Magnet fragility

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them shattering into shards.

Implant safety

For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Heat sensitivity

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Safety First! Learn more about risks in the article: Safety of working with magnets.

MW 4x8 / N38 - cylindrical magnet

Technical of the product - MW 4x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - technical parameters

Table 1: Static pull force (pull vs gap) - interaction chart MW 4x8 / N38

Table 2: Slippage load (vertical surface) MW 4x8 / N38

Table 3: Wall mounting (sliding) - vertical pull MW 4x8 / N38

Table 4: Steel thickness (saturation) - power losses MW 4x8 / N38

Table 5: Working in heat (material behavior) - power drop MW 4x8 / N38

Table 6: Two magnets (repulsion) - field range MW 4x8 / N38

Table 7: Safety (HSE) (implants) - warnings MW 4x8 / N38

Table 8: Dynamics (cracking risk) - collision effects MW 4x8 / N38

Table 9: Coating parameters (durability) MW 4x8 / N38

Table 10: Construction data (Pc) MW 4x8 / N38

Table 11: Underwater work (magnet fishing) MW 4x8 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Heat tolerance

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

Elemental analysis

Environmental data

Magnet pull force

Field Strength

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Benefits

Disadvantages

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Impact of factors on magnetic holding capacity in practice

Safe handling of neodymium magnets

Respect the power

Keep away from children

Crushing risk

Avoid contact if allergic

Data carriers

GPS Danger

Combustion hazard

Magnet fragility

Implant safety

Heat sensitivity

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - interaction chart
MW 4x8 / N38

Table 2: Slippage load (vertical surface)
MW 4x8 / N38

Table 3: Wall mounting (sliding) - vertical pull
MW 4x8 / N38

Table 4: Steel thickness (saturation) - power losses
MW 4x8 / N38

Table 5: Working in heat (material behavior) - power drop
MW 4x8 / N38

Table 6: Two magnets (repulsion) - field range
MW 4x8 / N38

Table 7: Safety (HSE) (implants) - warnings
MW 4x8 / N38

Table 8: Dynamics (cracking risk) - collision effects
MW 4x8 / N38

Table 9: Coating parameters (durability)
MW 4x8 / N38

Table 10: Construction data (P_c)
MW 4x8 / N38

Table 11: Underwater work (magnet fishing)
MW 4x8 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.