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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

1.132 ZŁ with VAT / pcs + price for transport

0.920 ZŁ net + 23% VAT / pcs

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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	T
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 106	°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 simulation of the magnet - data

The following information represent the result of a mathematical calculation. Results are based on algorithms for the material Nd₂Fe₁₄B. Operational conditions may deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

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	low risk
1 mm	2774 Gs 277.4 mT	1.27 kg / 1266.5 g 12.4 N	low risk
2 mm	2090 Gs 209.0 mT	0.72 kg / 719.2 g 7.1 N	low risk
3 mm	1521 Gs 152.1 mT	0.38 kg / 380.7 g 3.7 N	low risk
5 mm	795 Gs 79.5 mT	0.10 kg / 104.1 g 1.0 N	low risk
10 mm	205 Gs 20.5 mT	0.01 kg / 6.9 g 0.1 N	low risk
15 mm	76 Gs 7.6 mT	0.00 kg / 1.0 g 0.0 N	low risk
20 mm	36 Gs 3.6 mT	0.00 kg / 0.2 g 0.0 N	low risk
30 mm	12 Gs 1.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	3 Gs 0.3 mT	0.00 kg / 0.0 g 0.0 N	low risk

Grip strength drops drastically with every subsequent millimeter of spacing. Remember that even the smallest gap (e.g., contamination, paint, dust) significantly weakens the grip. Magnets hold optimally during direct contact; air break weakens the force. Notice how rapidly the pull force plummet, when the magnet does not touch flatly to the steel surface. When designing the mounting, avoid redundant distances.

Table 2: Shear Capacity (Vertical Surface)
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

This section calculates the theoretical force necessary to initiate the shifting of the magnet vertically along a upright steel plate (considering typical friction). The holding force depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
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 hanging a holder on a upright plane (e.g., a fridge), it you can count on only about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that magnets slip faster than they detach. Designing a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a significantly smaller weight. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Steel thickness (saturation) - 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 too thin steel is not enough to absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - power drop
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

Classic neodymiums lose power past the thermal threshold. Protect against heat – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the magnet's power briefly decreases. Do not use this product in hot environments exceeding its working range. Too high temperature will result in irreversible degradation of magnetism.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
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 wider radius than a magnet and sheet setup. The setup of two magnets generates a stronger field and a larger range of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the collision energy is extreme. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density for N-N configuration drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).

Table 7: Safety (HSE) (implants) - 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

A strong magnetic field poses a large risk to IT equipment and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (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

Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	2 314 Mx	23.1 µWb
Współczynnik Pc	0.44	Niski (Płaski)

Flux value emitted by the pole face. Essential parameter for coil applications and sensors. Permeance Coefficient defines the working geometry.

Table 11: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Note: On a vertical surface, the magnet retains merely ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

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

0.00

Technical specification and ecology

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%

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)|Safety information|GPSR compliance}

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 incredibly powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø9x3 mm, guarantees the highest energy density. 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 magnetic rod with impressive force (approx. 1.94 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 18.99 N with a weight of only 1.43 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., 9.1 mm) using epoxy glues. To ensure stability in automation, anaerobic resins 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 (Ø9x3), 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 Ø9x3 mm, which, at a weight of 1.43 g, makes it an element with high magnetic energy density. 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 oxidation, 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. 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 as well as weaknesses of Nd₂Fe₁₄B magnets.

Pros

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

They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
They maintain their magnetic properties even under strong external field,
Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
Possibility of individual shaping as well as adapting to atypical applications,
Versatile presence in future technologies – they find application in HDD drives, electric motors, diagnostic systems, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in miniature devices

Cons

Disadvantages of neodymium magnets:

They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
Neodymium magnets lose their force 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
Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing nuts and complex shapes in magnets, we recommend using cover - magnetic holder.
Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to complicate diagnosis medical in case of swallowing.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what affects it?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:

with the application of a sheet made of special test steel, ensuring maximum field concentration
with a cross-section no less than 10 mm
with an ground contact surface
with direct contact (without impurities)
for force acting at a right angle (in the magnet axis)
in neutral thermal conditions

Determinants of practical lifting force of a magnet

In real-world applications, the real power depends on a number of factors, ranked from the most important:

Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets

Safe operation

Use magnets with awareness. Their immense force can surprise even experienced users. Stay alert and respect their power.

Phone sensors

Remember: neodymium magnets produce a field that disrupts precision electronics. Keep a separation from your phone, device, and navigation systems.

Mechanical processing

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Warning for heart patients

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Swallowing risk

Product intended for adults. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.

Eye protection

Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Warning for allergy sufferers

A percentage of the population suffer from a sensitization to nickel, which is the standard coating for NdFeB magnets. Frequent touching may cause an allergic reaction. We suggest use protective gloves.

Operating temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Safe distance

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

Serious injuries

Large magnets can crush fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Warning! Details about hazards in the article: Safety of working with magnets.

MW 9x3 / N38 - cylindrical magnet

Want to negotiate?

MW 9x3 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - data

1. Shear force

2. Steel thickness impact

3. Temperature resistance

Elemental analysis

Ecology and recycling (GPSR)

Magnet Pull Force

Magnetic Field

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Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Cons

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what affects it?

Determinants of practical lifting force of a magnet

Safe operation

Phone sensors

Mechanical processing

Warning for heart patients

Swallowing risk

Eye protection

Warning for allergy sufferers

Operating temperature

Safe distance

Serious injuries

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.