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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

view properties »

3.57 ZŁ with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

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Technical - 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

Physical analysis of the assembly - report

Presented data are the result of a engineering calculation. Values rely on algorithms for the class Nd₂Fe₁₄B. Real-world conditions may differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
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	safe
1 mm	3877 Gs 387.7 mT	0.18 kg / 178.6 g 1.8 N	safe
2 mm	2308 Gs 230.8 mT	0.06 kg / 63.3 g 0.6 N	safe
3 mm	1419 Gs 141.9 mT	0.02 kg / 23.9 g 0.2 N	safe
5 mm	639 Gs 63.9 mT	0.00 kg / 4.8 g 0.0 N	safe
10 mm	173 Gs 17.3 mT	0.00 kg / 0.4 g 0.0 N	safe
15 mm	75 Gs 7.5 mT	0.00 kg / 0.1 g 0.0 N	safe
20 mm	40 Gs 4.0 mT	0.00 kg / 0.0 g 0.0 N	safe
30 mm	16 Gs 1.6 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	safe

Grip strength drops drastically per each millimeter of spacing. Note that even a very thin break (e.g., dirt, paint, dust) strongly diminishes the holding power. Magnetic products work most effectively at the point of direct contact; air break kills the power. See how flashily the load capacity drop, when the product does not adhere flatly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Sliding hold (wall)
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 table below calculates the approximate force required to cause the downward movement of the magnet downwards along a upright metal surface (considering standard friction). This value is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
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 vertical surface (e.g., a fridge), it will maintain barely about 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip influence the fact that holders slide down easier than they detach. Planning a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a much lighter cargo. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
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 take in the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a too thin substrate, the field will pass right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., car bodies), the holder holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (stability) - 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 damage this product. With every degree above norm, the magnet's power briefly decreases. Refrain from using this magnet close to ovens exceeding its working range. Too high temperature will cause irreversible degradation of magnetic properties.

*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
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 magnetic products interact from a significantly greater distance than a magnet and steel setup. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (implants) - 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
Remote	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 poses a real danger to electronic devices and medical implants. These neodymiums produce a field that destroys function of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (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

NdFeB products are prone to chipping – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when working 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. Improper coating selection is the most common cause of magnet failure over time.

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 passing through the magnet pole. Key data for generator designers as well as sensors. P_c value determines the working geometry.

Table 11: Physics of underwater searching
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: 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. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Heat tolerance

*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

Material specification

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%

Ecology and recycling (GPSR)

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

Magnet Unit Converter

Magnet pull force

Force in kg

Force (N)

Force in lbs

Magnetic Field

Induction (T)

Type data into a field, and the rest change in real-time.

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The offered product is a very strong rod magnet, produced from advanced NdFeB material, which, with dimensions of Ø5x30 mm, guarantees maximum efficiency. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.45 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

This model is created for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 4.40 N with a weight of only 4.42 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using epoxy glues. To ensure long-term durability 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 automation 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 available off-the-shelf in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 30 mm. 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.

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 5 mm. 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 and weaknesses of neodymium magnets.

Advantages

Besides their immense magnetic power, neodymium magnets offer the following advantages:

They do not lose magnetism, even during approximately ten years – the reduction in lifting capacity is only ~1% (based on measurements),
They possess excellent resistance to magnetism drop as a result of external magnetic sources,
Thanks to the smooth finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
Neodymium magnets achieve maximum magnetic induction on a small surface, which ensures high operational effectiveness,
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...
Possibility of exact modeling as well as adjusting to specific applications,
Universal use in modern technologies – they find application in mass storage devices, brushless drives, medical equipment, as well as modern systems.
Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 very resistant to heat
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
Due to limitations in creating nuts and complicated forms in magnets, we propose using casing - magnetic mechanism.
Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these products can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

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

on a plate made of mild steel, optimally conducting the magnetic field
with a thickness of at least 10 mm
with an polished contact surface
with zero gap (without paint)
under vertical force direction (90-degree angle)
at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, mainly (from most important):

Distance (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safe handling of NdFeB magnets

Phone sensors

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Handling guide

Handle magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

Do not drill into magnets

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Danger to pacemakers

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, cease working with magnets and use protective gear.

Eye protection

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Adults only

NdFeB magnets are not intended for children. Accidental ingestion of several magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

Keep away from computers

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Heat warning

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Serious injuries

Risk of injury: The attraction force is so great that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Safety First! Looking for details? Read our article: Why are neodymium magnets dangerous?

MW 5x30 / N38 - cylindrical magnet

Technical - MW 5x30 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the assembly - report

Table 1: Static pull force (pull vs gap) - characteristics MW 5x30 / N38

Table 2: Sliding hold (wall) MW 5x30 / N38

Table 3: Wall mounting (shearing) - vertical pull MW 5x30 / N38

Table 4: Material efficiency (saturation) - power losses MW 5x30 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field collision MW 5x30 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MW 5x30 / N38

Table 8: Impact energy (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: Physics of underwater searching MW 5x30 / N38

1. Sliding resistance

2. Efficiency vs thickness

3. Heat tolerance

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

Material specification

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

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Strengths and weaknesses of neodymium magnets.

Advantages

Cons

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Impact of factors on magnetic holding capacity in practice

Safe handling of NdFeB magnets

Phone sensors

Handling guide

Do not drill into magnets

Danger to pacemakers

Warning for allergy sufferers

Eye protection

Adults only

Keep away from computers

Heat warning

Serious injuries

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MW 5x30 / N38

Table 2: Sliding hold (wall)
MW 5x30 / N38

Table 3: Wall mounting (shearing) - vertical pull
MW 5x30 / N38

Table 4: Material efficiency (saturation) - power losses
MW 5x30 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 5x30 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MW 5x30 / N38

Table 8: Impact energy (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: Physics of underwater searching
MW 5x30 / N38