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MW 8x5 / 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 010105

GTIN/EAN: 5906301811046

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

1.88 g

Magnetization Direction

↑ axial

Load capacity

2.17 kg / 21.31 N

Magnetic Induction

483.41 mT / 4834 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Technical - MW 8x5 / N38 - cylindrical magnet

Specification / characteristics - MW 8x5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010105
GTIN/EAN	5906301811046
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	8 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	1.88 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.17 kg / 21.31 N
Magnetic Induction ~ ?	483.41 mT / 4834 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x5 / 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 - technical parameters

These information constitute the outcome of a physical calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Actual performance might slightly differ. Use these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4830 Gs 483.0 mT	2.17 kg / 2170.0 g 21.3 N	warning
1 mm	3655 Gs 365.5 mT	1.24 kg / 1242.8 g 12.2 N	safe
2 mm	2610 Gs 261.0 mT	0.63 kg / 633.9 g 6.2 N	safe
3 mm	1825 Gs 182.5 mT	0.31 kg / 310.0 g 3.0 N	safe
5 mm	915 Gs 91.5 mT	0.08 kg / 77.9 g 0.8 N	safe
10 mm	234 Gs 23.4 mT	0.01 kg / 5.1 g 0.1 N	safe
15 mm	89 Gs 8.9 mT	0.00 kg / 0.7 g 0.0 N	safe
20 mm	43 Gs 4.3 mT	0.00 kg / 0.2 g 0.0 N	safe
30 mm	14 Gs 1.4 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	3 Gs 0.3 mT	0.00 kg / 0.0 g 0.0 N	safe

Grip strength decreases drastically with every subsequent millimeter of gap. Note that even a very thin break (e.g., dirt, paint, rust) noticeably diminishes the holding power. Magnetic products hold strongest during direct contact; air break nullifies the force. Observe how quickly the load capacity fall, when the magnet does not touch directly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Slippage force (wall)
MW 8x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.43 kg / 434.0 g 4.3 N
1 mm	Stal (~0.2)	0.25 kg / 248.0 g 2.4 N
2 mm	Stal (~0.2)	0.13 kg / 126.0 g 1.2 N
3 mm	Stal (~0.2)	0.06 kg / 62.0 g 0.6 N
5 mm	Stal (~0.2)	0.02 kg / 16.0 g 0.2 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 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 theoretical force needed to cause the slippage of the magnet down against a vertical steel plate (assuming standard friction coefficient). This parameter varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 8x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.65 kg / 651.0 g 6.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.43 kg / 434.0 g 4.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.22 kg / 217.0 g 2.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.09 kg / 1085.0 g 10.6 N

When hanging a magnet on a vertical plane (e.g., a car body), it will only hold barely approx. 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders slip easier than they pop off the substrate. Designing a vertical fastening? Remember that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 8x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.22 kg / 217.0 g 2.1 N
1 mm	25%	0.54 kg / 542.5 g 5.3 N
2 mm	50%	1.09 kg / 1085.0 g 10.6 N
5 mm	100%	2.17 kg / 2170.0 g 21.3 N
10 mm	100%	2.17 kg / 2170.0 g 21.3 N

A thin sheet is incapable of take in the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you need a suitably thick piece of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MW 8x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	2.17 kg / 2170.0 g 21.3 N	OK
40 °C	-2.2%	2.12 kg / 2122.3 g 20.8 N	OK
60 °C	-4.4%	2.07 kg / 2074.5 g 20.4 N	OK
80 °C	-6.6%	2.03 kg / 2026.8 g 19.9 N
100 °C	-28.8%	1.55 kg / 1545.0 g 15.2 N

Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly destroy this magnet. As the temperature rises, the magnet's power temporarily drops. Refrain from using this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.

*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 8x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	7.23 kg / 7228 g 70.9 N 5 742 Gs	N/A
1 mm	5.58 kg / 5585 g 54.8 N 8 490 Gs	5.03 kg / 5026 g 49.3 N ~0 Gs
2 mm	4.14 kg / 4140 g 40.6 N 7 310 Gs	3.73 kg / 3726 g 36.6 N ~0 Gs
3 mm	2.98 kg / 2984 g 29.3 N 6 207 Gs	2.69 kg / 2686 g 26.3 N ~0 Gs
5 mm	1.48 kg / 1479 g 14.5 N 4 369 Gs	1.33 kg / 1331 g 13.1 N ~0 Gs
10 mm	0.26 kg / 260 g 2.5 N 1 830 Gs	0.23 kg / 234 g 2.3 N ~0 Gs
20 mm	0.02 kg / 17 g 0.2 N 468 Gs	0.02 kg / 15 g 0.1 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 47 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a further horizon of action. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the collision energy is massive. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Hazards (electronics) - precautionary measures
MW 8x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	4.5 cm
Hearing aid	10 Gs (1.0 mT)	3.5 cm
Mechanical watch	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

Powerful magnet radiation is a serious hazard to electronics and medical implants. These NdFeB products generate a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MW 8x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	34.31 km/h (9.53 m/s)	0.09 J
30 mm	59.35 km/h (16.49 m/s)	0.26 J
50 mm	76.62 km/h (21.28 m/s)	0.43 J
100 mm	108.35 km/h (30.10 m/s)	0.85 J

Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Corrosion resistance
MW 8x5 / 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: Electrical data (P_c)
MW 8x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 450 Mx	24.5 µWb
P_c Coefficient	0.68	High (Stable)

Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 8x5 / N38

Environment	Effective steel pull	Effect
Air (land)	2.17 kg	Standard
Water (riverbed)	2.48 kg (+0.31 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Vertical hold

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Temperature resistance

*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) = 0.68

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.

Engineering data and GPSR

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%

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: 010105-2025

Magnet Unit Converter

Magnet pull force

lbs

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The offered product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø8x5 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.17 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, 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 magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 21.31 N with a weight of only 1.88 g, this rod is indispensable in miniature devices and wherever low weight is crucial.

Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest magnets in the same volume (Ø8x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

This model is characterized by dimensions Ø8x5 mm, which, at a weight of 1.88 g, makes it an element with impressive magnetic energy density. The value of 21.31 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.88 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.

This rod magnet is magnetized axially (along the height of 5 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 through the diameter if your project requires it.

Strengths and weaknesses of Nd₂Fe₁₄B magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:

They do not lose magnetism, even over around 10 years – the reduction in strength is only ~1% (based on measurements),
Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external field sources,
The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
Magnets are characterized by excellent magnetic induction on the outer side,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to flexibility in forming and the capacity to customize to individual projects,
Key role in electronics industry – they are commonly used in magnetic memories, drive modules, diagnostic systems, also complex engineering applications.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Problematic aspects of neodymium magnets and proposals for their use:

To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what affects it?

The declared magnet strength concerns the peak performance, measured under ideal test conditions, meaning:

on a plate made of structural steel, optimally conducting the magnetic flux
possessing a thickness of min. 10 mm to avoid saturation
with an ideally smooth contact surface
without the slightest clearance between the magnet and steel
during pulling in a direction vertical to the plane
at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the working load will differ depending on elements below, in order of importance:

Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets

Keep away from computers

Powerful magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

No play value

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.

Magnetic interference

A powerful magnetic field disrupts the operation of compasses in phones and navigation systems. Maintain magnets near a smartphone to prevent breaking the sensors.

Heat warning

Avoid heat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Machining danger

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Danger to pacemakers

Patients with a ICD should keep an large gap from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Finger safety

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and opt for encased magnets.

Conscious usage

Be careful. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can react.

Magnets are brittle

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Warning! Details about risks in the article: Magnet Safety Guide.

MW 8x5 / N38 - cylindrical magnet

Technical - MW 8x5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - technical parameters

Table 1: Static pull force (pull vs gap) - characteristics MW 8x5 / N38

Table 2: Slippage force (wall) MW 8x5 / N38

Table 3: Vertical assembly (shearing) - vertical pull MW 8x5 / N38

Table 4: Material efficiency (saturation) - power losses MW 8x5 / N38

Table 5: Working in heat (stability) - resistance threshold MW 8x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MW 8x5 / N38

Table 7: Hazards (electronics) - precautionary measures MW 8x5 / N38

Table 8: Dynamics (kinetic energy) - collision effects MW 8x5 / N38

Table 9: Corrosion resistance MW 8x5 / N38

Table 10: Electrical data (Pc) MW 8x5 / N38

Table 11: Underwater work (magnet fishing) MW 8x5 / N38

1. Vertical hold

2. Efficiency vs thickness

3. Temperature resistance

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

Elemental analysis

Sustainability

Magnet pull force

Magnetic Induction

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Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

Cons

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Magnet lifting force in use – key factors

H&S for magnets

Keep away from computers

No play value

Magnetic interference

Heat warning

Machining danger

Danger to pacemakers

Finger safety

Metal Allergy

Conscious usage

Magnets are brittle

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x5 / N38

Table 2: Slippage force (wall)
MW 8x5 / N38

Table 3: Vertical assembly (shearing) - vertical pull
MW 8x5 / N38

Table 4: Material efficiency (saturation) - power losses
MW 8x5 / N38

Table 5: Working in heat (stability) - resistance threshold
MW 8x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 8x5 / N38

Table 7: Hazards (electronics) - precautionary measures
MW 8x5 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MW 8x5 / N38

Table 9: Corrosion resistance
MW 8x5 / N38

Table 10: Electrical data (P_c)
MW 8x5 / N38

Table 11: Underwater work (magnet fishing)
MW 8x5 / N38

Strengths and weaknesses of Nd₂Fe₁₄B magnets.