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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

check specifications »

0.701 ZŁ with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical - 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

Technical modeling of the magnet - report

The following values are the direct effect of a mathematical simulation. Values are based on algorithms for the material Nd₂Fe₁₄B. Operational conditions may differ. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
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 weakens significantly with every mm of distance. Keep in mind that even the smallest gap (e.g., dirt, paint, dust) significantly reduces the pull force. Magnetic products operate strongest at the point of direct contact; gap nullifies the power. Notice how quickly the pull force plummet, when the magnet does not adhere flatly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Sliding capacity (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 table below calculates the estimated shear load necessary to start the slippage of the magnet down against a upright steel wall (considering standard friction coefficient). This value is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 holder on a upright wall (e.g., a fridge), it will only hold barely approx. 20%-30% of its maximum pull force. Gravity and a low friction coefficient mean that magnets slip faster than they detach. Planning a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter weight. Utilizing a rubberized layer can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - 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 metal plate is not enough to focus the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To achieve the maximum of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - 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

Standard neodymium magnets change their properties power after exceeding the maximum temperature. Protect against heat – heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's power momentarily drops. Refrain from using this product close to heaters higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetism.

*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
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 attract each other from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Protective zones (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

Powerful magnet radiation is a large risk to electronic devices as well as pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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 delicate – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Corrosion resistance
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

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

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

Total magnetic flux emitted by the pole surface. Key data for generator designers and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

*For standard magnets, 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

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 and environmental data

Chemical composition

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%

Sustainability

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

Measurement Calculator

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The presented product is a very strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø4x8 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.35 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning 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 immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Magnets 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 the strongest magnets in the same volume (Ø4x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

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.

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 4 mm. Such an arrangement is standard 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 diametrically if your project requires it.

Pros and cons of neodymium magnets.

Advantages

Apart from their consistent power, neodymium magnets have these key benefits:

Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
Neodymium magnets remain exceptionally resistant to demagnetization caused by external magnetic fields,
Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
Magnetic induction on the surface of the magnet is strong,
Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
Thanks to freedom in forming and the ability to modify to client solutions,
Significant place in innovative solutions – they are commonly used in hard drives, electric drive systems, medical devices, and complex engineering applications.
Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Cons of neodymium magnets and proposals for their use:

At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
We warn that neodymium magnets can reduce their strength 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 corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing threads and complicated shapes in magnets, we propose using cover - magnetic mount.
Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
Due to complex production process, their price is higher than average,

Pull force analysis

Magnetic strength at its maximum – what affects it?

The force parameter is a theoretical maximum value performed under standard conditions:

with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
whose thickness is min. 10 mm
characterized by lack of roughness
under conditions of gap-free contact (metal-to-metal)
under axial force vector (90-degree angle)
in temp. approx. 20°C

Determinants of lifting force in real conditions

Bear in mind that the magnet holding may be lower depending on the following factors, starting with the most relevant:

Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets

Swallowing risk

Always keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are fatal.

Handling rules

Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and respect their power.

Thermal limits

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Medical interference

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Electronic devices

Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Sensitization to coating

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or opt for encased magnets.

GPS Danger

A strong magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.

Crushing force

Mind your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

Fragile material

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

Machining danger

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?

MW 4x8 / N38 - cylindrical magnet

Technical - MW 4x8 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - report

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

Table 2: Sliding capacity (vertical surface) MW 4x8 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MW 4x8 / N38

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

Table 5: Thermal stability (stability) - power drop MW 4x8 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system MW 4x8 / N38

Table 7: Protective zones (implants) - warnings MW 4x8 / N38

Table 8: Collisions (kinetic energy) - collision effects MW 4x8 / N38

Table 9: Corrosion resistance MW 4x8 / N38

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

Table 11: Hydrostatics and buoyancy MW 4x8 / N38

1. Vertical hold

2. Steel thickness impact

3. Power loss vs temp

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

Chemical composition

Sustainability

Force (pull)

Magnetic Induction

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NCM 10x13.5x5 / N38 - channel magnetic holder

Pros and cons of neodymium magnets.

Advantages

Limitations

Pull force analysis

Magnetic strength at its maximum – what affects it?

Determinants of lifting force in real conditions

Safe handling of NdFeB magnets

Swallowing risk

Handling rules

Thermal limits

Medical interference

Electronic devices

Sensitization to coating

GPS Danger

Crushing force

Fragile material

Machining danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Sliding capacity (vertical surface)
MW 4x8 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 4x8 / N38

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

Table 5: Thermal stability (stability) - power drop
MW 4x8 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 4x8 / N38

Table 7: Protective zones (implants) - warnings
MW 4x8 / N38

Table 8: Collisions (kinetic energy) - collision effects
MW 4x8 / N38

Table 9: Corrosion resistance
MW 4x8 / N38

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

Table 11: Hydrostatics and buoyancy
MW 4x8 / N38