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MW 5x30 / 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 010088

GTIN/EAN: 5906301810872

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

4.42 g

Magnetization Direction

↑ axial

Load capacity

0.45 kg / 4.40 N

Magnetic Induction

616.32 mT / 6163 Gs

Coating

[NiCuNi] Nickel

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Technical details - MW 5x30 / N38 - cylindrical magnet

Specification / characteristics - MW 5x30 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010088
GTIN/EAN	5906301810872
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	5 mm [±0,1 mm]
Height	30 mm [±0,1 mm]
Weight	4.42 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.45 kg / 4.40 N
Magnetic Induction ~ ?	616.32 mT / 6163 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x30 / 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

Engineering analysis of the assembly - report

These data are the outcome of a engineering analysis. Values are based on models for the class Nd₂Fe₁₄B. Actual conditions may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static force (force vs distance) - power drop
MW 5x30 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6154 Gs 615.4 mT	0.45 kg / 450.0 g 4.4 N	low risk
1 mm	3877 Gs 387.7 mT	0.18 kg / 178.6 g 1.8 N	low risk
2 mm	2308 Gs 230.8 mT	0.06 kg / 63.3 g 0.6 N	low risk
3 mm	1419 Gs 141.9 mT	0.02 kg / 23.9 g 0.2 N	low risk
5 mm	639 Gs 63.9 mT	0.00 kg / 4.8 g 0.0 N	low risk
10 mm	173 Gs 17.3 mT	0.00 kg / 0.4 g 0.0 N	low risk
15 mm	75 Gs 7.5 mT	0.00 kg / 0.1 g 0.0 N	low risk
20 mm	40 Gs 4.0 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	16 Gs 1.6 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	low risk

Pulling power drops sharply per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) noticeably reduces the pull force. Neodymiums operate most effectively during direct contact; gap drastically cuts the force. See how flashily the pull force drop, when the product does not adhere tightly to the steel surface. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Shear force (vertical surface)
MW 5x30 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.09 kg / 90.0 g 0.9 N
1 mm	Stal (~0.2)	0.04 kg / 36.0 g 0.4 N
2 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 4.0 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 indicates the estimated shear load needed to initiate the slippage of the magnet vertically against a vertical steel wall (considering standard friction). This parameter depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 5x30 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.14 kg / 135.0 g 1.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.09 kg / 90.0 g 0.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.05 kg / 45.0 g 0.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.23 kg / 225.0 g 2.2 N

When mounting a holder on a upright surface (e.g., a car body), it you can count on barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that products slip easier than they pop off the substrate. Want to create a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a significantly smaller weight. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 5x30 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.05 kg / 45.0 g 0.4 N
1 mm	25%	0.11 kg / 112.5 g 1.1 N
2 mm	50%	0.23 kg / 225.0 g 2.2 N
5 mm	100%	0.45 kg / 450.0 g 4.4 N
10 mm	100%	0.45 kg / 450.0 g 4.4 N

A thin sheet is incapable of absorb the full magnetic flux, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on delicate walls (e.g., car bodies), the product holds weaker. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MW 5x30 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.45 kg / 450.0 g 4.4 N	OK
40 °C	-2.2%	0.44 kg / 440.1 g 4.3 N	OK
60 °C	-4.4%	0.43 kg / 430.2 g 4.2 N	OK
80 °C	-6.6%	0.42 kg / 420.3 g 4.1 N
100 °C	-28.8%	0.32 kg / 320.4 g 3.1 N

Ordinary NdFeB products lose parameters past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's power briefly drops. Avoid using this magnet in hot environments exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.

*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 5x30 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.58 kg / 4584 g 45.0 N 6 170 Gs	N/A
1 mm	2.98 kg / 2982 g 29.3 N 9 927 Gs	2.68 kg / 2684 g 26.3 N ~0 Gs
2 mm	1.82 kg / 1820 g 17.9 N 7 755 Gs	1.64 kg / 1638 g 16.1 N ~0 Gs
3 mm	1.08 kg / 1083 g 10.6 N 5 981 Gs	0.97 kg / 974 g 9.6 N ~0 Gs
5 mm	0.39 kg / 391 g 3.8 N 3 595 Gs	0.35 kg / 352 g 3.5 N ~0 Gs
10 mm	0.05 kg / 49 g 0.5 N 1 278 Gs	0.04 kg / 44 g 0.4 N ~0 Gs
20 mm	0.00 kg / 4 g 0.0 N 346 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 49 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a wider radius of performance. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is marginally weaker than the attraction, but still impressive.
*Field value between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Hazards (electronics) - precautionary measures
MW 5x30 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.0 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Timepiece	20 Gs (2.0 mT)	3.0 cm
Mobile device	40 Gs (4.0 mT)	2.5 cm
Car key	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

A strong magnetic field is a serious hazard to electronic devices as well as medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 5x30 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	10.18 km/h (2.83 m/s)	0.02 J
30 mm	17.63 km/h (4.90 m/s)	0.05 J
50 mm	22.75 km/h (6.32 m/s)	0.09 J
100 mm	32.18 km/h (8.94 m/s)	0.18 J

Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or injury to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MW 5x30 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 5x30 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	1 468 Mx	14.7 µWb
P_c Coefficient	1.59	High (Stable)

Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. P_c value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 5x30 / N38

Environment	Effective steel pull	Effect
Air (land)	0.45 kg	Standard
Water (riverbed)	0.52 kg (+0.07 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. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 1.59

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

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%

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: 010088-2025

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This product is a very strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø5x30 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.45 kg), this product is in stock from our warehouse in Poland, ensuring quick 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 pull force of 4.40 N with a weight of only 4.42 g, this rod is indispensable in electronics and wherever every gram matters.

Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Magnets N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø5x30), 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 Ø5x30 mm, which, at a weight of 4.42 g, makes it an element with high magnetic energy density. The value of 4.40 N means that the magnet is capable of holding a weight many times exceeding its own mass of 4.42 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 30 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Pros

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

They do not lose strength, even after approximately ten years – the reduction in lifting capacity is only ~1% (according to tests),
Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
They feature high magnetic induction at the operating surface, which increases their power,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Considering the option of free molding and customization to specialized requirements, NdFeB magnets can be produced in a broad palette of shapes and sizes, which increases their versatility,
Versatile presence in electronics industry – they find application in mass storage devices, drive modules, medical equipment, and multitasking production systems.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
Neodymium magnets lose 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
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
We recommend a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:

with the contact of a sheet made of special test steel, ensuring maximum field concentration
with a cross-section of at least 10 mm
with a surface free of scratches
with total lack of distance (no paint)
during pulling in a direction vertical to the mounting surface
in stable room temperature

Key elements affecting lifting force

In real-world applications, the actual holding force results from many variables, presented from most significant:

Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

GPS and phone interference

A strong magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.

Fire risk

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Safe operation

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

Pinching danger

Big blocks can break fingers instantly. Do not place your hand between two attracting surfaces.

Permanent damage

Control the heat. Exposing the magnet to high heat will permanently weaken its properties and strength.

This is not a toy

Adult use only. Small elements pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.

Keep away from computers

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Fragile material

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Nickel coating and allergies

A percentage of the population experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact can result in dermatitis. It is best to use safety gloves.

Pacemakers

People with a pacemaker must maintain an absolute distance from magnets. The magnetism can interfere with the operation of the implant.

Important! Details about risks in the article: Safety of working with magnets.

MW 5x30 / N38 - cylindrical magnet

Technical details - MW 5x30 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the assembly - report

Table 1: Static force (force vs distance) - power drop MW 5x30 / N38

Table 2: Shear force (vertical surface) MW 5x30 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MW 5x30 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MW 5x30 / N38

Table 5: Thermal stability (material behavior) - power drop MW 5x30 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MW 5x30 / N38

Table 7: Hazards (electronics) - precautionary measures MW 5x30 / N38

Table 8: Collisions (cracking risk) - collision effects MW 5x30 / N38

Table 9: Surface protection spec MW 5x30 / N38

Table 10: Construction data (Flux) MW 5x30 / N38

Table 11: Hydrostatics and buoyancy MW 5x30 / N38

1. Sliding resistance

2. Steel thickness impact

3. Power loss vs temp

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

Chemical composition

Environmental data

Magnet pull force

Magnetic Field

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Advantages as well as disadvantages of rare earth magnets.

Pros

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Key elements affecting lifting force

Safety rules for work with NdFeB magnets

GPS and phone interference

Fire risk

Safe operation

Pinching danger

Permanent damage

This is not a toy

Keep away from computers

Fragile material

Nickel coating and allergies

Pacemakers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - power drop
MW 5x30 / N38

Table 2: Shear force (vertical surface)
MW 5x30 / N38

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 5x30 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 5x30 / N38

Table 5: Thermal stability (material behavior) - power drop
MW 5x30 / N38

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 5x30 / N38

Table 7: Hazards (electronics) - precautionary measures
MW 5x30 / N38

Table 8: Collisions (cracking risk) - collision effects
MW 5x30 / N38

Table 9: Surface protection spec
MW 5x30 / N38

Table 10: Construction data (Flux)
MW 5x30 / N38

Table 11: Hydrostatics and buoyancy
MW 5x30 / N38