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MW 9x3 / 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 010108

GTIN/EAN: 5906301811077

5.00

Diameter Ø

9 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.43 g

Magnetization Direction

↑ axial

Load capacity

1.94 kg / 18.99 N

Magnetic Induction

343.55 mT / 3436 Gs

Coating

[NiCuNi] Nickel

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Technical specification of the product - MW 9x3 / N38 - cylindrical magnet

Specification / characteristics - MW 9x3 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010108
GTIN/EAN	5906301811077
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	9 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	1.43 g
Magnetization Direction	↑ axial
Load capacity ~ ?	1.94 kg / 18.99 N
Magnetic Induction ~ ?	343.55 mT / 3436 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 9x3 / 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 modeling of the assembly - data

These values are the outcome of a engineering analysis. Values were calculated on models for the class Nd₂Fe₁₄B. Real-world parameters might slightly differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MW 9x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3433 Gs 343.3 mT	1.94 kg / 1940.0 g 19.0 N	weak grip
1 mm	2774 Gs 277.4 mT	1.27 kg / 1266.5 g 12.4 N	weak grip
2 mm	2090 Gs 209.0 mT	0.72 kg / 719.2 g 7.1 N	weak grip
3 mm	1521 Gs 152.1 mT	0.38 kg / 380.7 g 3.7 N	weak grip
5 mm	795 Gs 79.5 mT	0.10 kg / 104.1 g 1.0 N	weak grip
10 mm	205 Gs 20.5 mT	0.01 kg / 6.9 g 0.1 N	weak grip
15 mm	76 Gs 7.6 mT	0.00 kg / 1.0 g 0.0 N	weak grip
20 mm	36 Gs 3.6 mT	0.00 kg / 0.2 g 0.0 N	weak grip
30 mm	12 Gs 1.2 mT	0.00 kg / 0.0 g 0.0 N	weak grip
50 mm	3 Gs 0.3 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Grip strength drops sharply per each millimeter of gap. Note that even the smallest gap (e.g., dirt, paint, dust) strongly reduces the pull force. Magnetic products hold most effectively at the point of direct contact; air break nullifies the force. Notice how quickly the load capacity drop, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, eliminate additional spacers.

Table 2: Vertical hold (wall)
MW 9x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.39 kg / 388.0 g 3.8 N
1 mm	Stal (~0.2)	0.25 kg / 254.0 g 2.5 N
2 mm	Stal (~0.2)	0.14 kg / 144.0 g 1.4 N
3 mm	Stal (~0.2)	0.08 kg / 76.0 g 0.7 N
5 mm	Stal (~0.2)	0.02 kg / 20.0 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 following data defines the theoretical shear load necessary to start the sliding of the magnet vertically along a upright steel wall (assuming typical friction coefficient). This parameter varies with the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 9x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.58 kg / 582.0 g 5.7 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.39 kg / 388.0 g 3.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.19 kg / 194.0 g 1.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.97 kg / 970.0 g 9.5 N

When placing a element on a vertical surface (e.g., a board), it will only hold barely about 20%-30% of its nominal power. Gravity as well as a weak degree of grip influence the fact that products slip faster than they pull off. Planning a vertical fastening? Note that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter weight. Application of an anti-slip pad can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 9x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.19 kg / 194.0 g 1.9 N
1 mm	25%	0.49 kg / 485.0 g 4.8 N
2 mm	50%	0.97 kg / 970.0 g 9.5 N
5 mm	100%	1.94 kg / 1940.0 g 19.0 N
10 mm	100%	1.94 kg / 1940.0 g 19.0 N

A thin metal plate cannot take in the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a thin surface, the field will pass right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect causes that on thin elements (e.g., thin profiles), the holder works worse. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - thermal limit
MW 9x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.94 kg / 1940.0 g 19.0 N	OK
40 °C	-2.2%	1.90 kg / 1897.3 g 18.6 N	OK
60 °C	-4.4%	1.85 kg / 1854.6 g 18.2 N
80 °C	-6.6%	1.81 kg / 1812.0 g 17.8 N
100 °C	-28.8%	1.38 kg / 1381.3 g 13.6 N

Standard neodymium magnets lose parameters past the thermal threshold. Avoid high temperatures – high temperature can permanently demagnetize this product. With increasing heat, the neodymium's power temporarily lowers. Refrain from using this product in hot environments exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 9x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.62 kg / 4623 g 45.4 N 4 949 Gs	N/A
1 mm	3.82 kg / 3822 g 37.5 N 6 244 Gs	3.44 kg / 3440 g 33.7 N ~0 Gs
2 mm	3.02 kg / 3018 g 29.6 N 5 548 Gs	2.72 kg / 2716 g 26.6 N ~0 Gs
3 mm	2.30 kg / 2303 g 22.6 N 4 847 Gs	2.07 kg / 2073 g 20.3 N ~0 Gs
5 mm	1.25 kg / 1253 g 12.3 N 3 575 Gs	1.13 kg / 1128 g 11.1 N ~0 Gs
10 mm	0.25 kg / 248 g 2.4 N 1 591 Gs	0.22 kg / 223 g 2.2 N ~0 Gs
20 mm	0.02 kg / 16 g 0.2 N 410 Gs	0.01 kg / 15 g 0.1 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 39 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products interact from a much further distance than a neodymium and metal combination. The connection of two magnets produces a massive flux and a further horizon of action. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).

Table 7: Protective zones (electronics) - precautionary measures
MW 9x3 / 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)	2.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	2.0 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 poses a serious hazard to electronics and pacemakers. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MW 9x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	37.23 km/h (10.34 m/s)	0.08 J
30 mm	64.34 km/h (17.87 m/s)	0.23 J
50 mm	83.06 km/h (23.07 m/s)	0.38 J
100 mm	117.47 km/h (32.63 m/s)	0.76 J

Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during installation 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 handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 9x3 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MW 9x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 314 Mx	23.1 µWb
P_c Coefficient	0.44	Low (Flat)

Total magnetic flux passing through the pole surface. Essential parameter in coil applications as well as sensors. The P_c coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 9x3 / N38

Environment	Effective steel pull	Effect
Air (land)	1.94 kg	Standard
Water (riverbed)	2.22 kg (+0.28 kg Buoyancy gain)	+14.5%

Rust risk: 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. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.44

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 and environmental data

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: 010108-2025

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The presented product is an extremely powerful cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø9x3 mm, guarantees optimal power. The MW 9x3 / N38 component is characterized by an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 1.94 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 18.99 N with a weight of only 1.43 g, this rod is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 9.1 mm) using two-component epoxy glues. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø9x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 9 mm and height 3 mm. The value of 18.99 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.43 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.

This rod magnet is magnetized axially (along the height of 3 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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.

Pros and cons of Nd₂Fe₁₄B magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
Magnets very well defend themselves against demagnetization caused by foreign field sources,
In other words, due to the metallic finish of gold, the element looks attractive,
They feature high magnetic induction at the operating surface, which affects their effectiveness,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Thanks to flexibility in constructing and the ability to customize to specific needs,
Universal use in electronics industry – they are used in computer drives, motor assemblies, diagnostic systems, and complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Cons

What to avoid - cons of neodymium magnets and ways of using them

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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 resistant to moisture, when using outdoors
Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:

on a base made of mild steel, effectively closing the magnetic flux
with a cross-section no less than 10 mm
with an polished touching surface
with zero gap (without paint)
for force applied at a right angle (in the magnet axis)
in temp. approx. 20°C

Lifting capacity in real conditions – factors

During everyday use, the real power results from a number of factors, ranked from the most important:

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings

Mechanical processing

Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Keep away from children

Strictly store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Magnetic media

Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Nickel coating and allergies

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for NdFeB magnets. Frequent touching can result in a rash. We strongly advise wear protective gloves.

Caution required

Handle with care. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can react.

Medical interference

People with a heart stimulator must maintain an safe separation from magnets. The magnetism can interfere with the functioning of the implant.

Bone fractures

Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Heat sensitivity

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Shattering risk

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them cracking into small pieces.

GPS Danger

A strong magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.

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

MW 9x3 / N38 - cylindrical magnet

Technical specification of the product - MW 9x3 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

Table 1: Static pull force (force vs gap) - characteristics MW 9x3 / N38

Table 2: Vertical hold (wall) MW 9x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 9x3 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MW 9x3 / N38

Table 5: Working in heat (material behavior) - thermal limit MW 9x3 / N38

Table 6: Two magnets (repulsion) - forces in the system MW 9x3 / N38

Table 7: Protective zones (electronics) - precautionary measures MW 9x3 / N38

Table 8: Dynamics (kinetic energy) - collision effects MW 9x3 / N38

Table 9: Anti-corrosion coating durability MW 9x3 / N38

Table 10: Construction data (Pc) MW 9x3 / N38

Table 11: Hydrostatics and buoyancy MW 9x3 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Power loss vs temp

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

Elemental analysis

Sustainability

Pulling force

Magnetic Field

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Pros and cons of Nd2Fe14B magnets.

Strengths

Cons

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Lifting capacity in real conditions – factors

Warnings

Mechanical processing

Keep away from children

Magnetic media

Nickel coating and allergies

Caution required

Medical interference

Bone fractures

Heat sensitivity

Shattering risk

GPS Danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - characteristics
MW 9x3 / N38

Table 2: Vertical hold (wall)
MW 9x3 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 9x3 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 9x3 / N38

Table 5: Working in heat (material behavior) - thermal limit
MW 9x3 / N38

Table 6: Two magnets (repulsion) - forces in the system
MW 9x3 / N38

Table 7: Protective zones (electronics) - precautionary measures
MW 9x3 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MW 9x3 / N38

Table 9: Anti-corrosion coating durability
MW 9x3 / N38

Table 10: Construction data (P_c)
MW 9x3 / N38

Table 11: Hydrostatics and buoyancy
MW 9x3 / N38

Pros and cons of Nd₂Fe₁₄B magnets.