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MW 9x3 / N38 - cylindrical magnet

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 with VAT / pcs + price for transport

0.920 ZŁ net + 23% VAT / pcs

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Technical details - 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

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 simulation of the product - report

These information constitute the direct effect of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Real-world conditions may differ. Use these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - power drop
MW 9x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3433 Gs
343.3 mT
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
safe
1 mm 2774 Gs
277.4 mT
1.27 kg / 2.79 LBS
1266.5 g / 12.4 N
safe
2 mm 2090 Gs
209.0 mT
0.72 kg / 1.59 LBS
719.2 g / 7.1 N
safe
3 mm 1521 Gs
152.1 mT
0.38 kg / 0.84 LBS
380.7 g / 3.7 N
safe
5 mm 795 Gs
79.5 mT
0.10 kg / 0.23 LBS
104.1 g / 1.0 N
safe
10 mm 205 Gs
20.5 mT
0.01 kg / 0.02 LBS
6.9 g / 0.1 N
safe
15 mm 76 Gs
7.6 mT
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
safe
20 mm 36 Gs
3.6 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe
30 mm 12 Gs
1.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 3 Gs
0.3 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.39 kg / 0.86 LBS
388.0 g / 3.8 N
1 mm Stal (~0.2) 0.25 kg / 0.56 LBS
254.0 g / 2.5 N
2 mm Stal (~0.2) 0.14 kg / 0.32 LBS
144.0 g / 1.4 N
3 mm Stal (~0.2) 0.08 kg / 0.17 LBS
76.0 g / 0.7 N
5 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 9x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.58 kg / 1.28 LBS
582.0 g / 5.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.39 kg / 0.86 LBS
388.0 g / 3.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.43 LBS
194.0 g / 1.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.97 kg / 2.14 LBS
970.0 g / 9.5 N

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.19 kg / 0.43 LBS
194.0 g / 1.9 N
1 mm
25%
0.49 kg / 1.07 LBS
485.0 g / 4.8 N
2 mm
50%
0.97 kg / 2.14 LBS
970.0 g / 9.5 N
3 mm
75%
1.46 kg / 3.21 LBS
1455.0 g / 14.3 N
5 mm
100%
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
10 mm
100%
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
11 mm
100%
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
12 mm
100%
1.94 kg / 4.28 LBS
1940.0 g / 19.0 N

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.94 kg / 4.28 LBS
1940.0 g / 19.0 N
OK
40 °C -2.2% 1.90 kg / 4.18 LBS
1897.3 g / 18.6 N
OK
60 °C -4.4% 1.85 kg / 4.09 LBS
1854.6 g / 18.2 N
80 °C -6.6% 1.81 kg / 3.99 LBS
1812.0 g / 17.8 N
100 °C -28.8% 1.38 kg / 3.05 LBS
1381.3 g / 13.6 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 9x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.62 kg / 10.19 LBS
4 949 Gs
0.69 kg / 1.53 LBS
693 g / 6.8 N
N/A
1 mm 3.82 kg / 8.43 LBS
6 244 Gs
0.57 kg / 1.26 LBS
573 g / 5.6 N
3.44 kg / 7.58 LBS
~0 Gs
2 mm 3.02 kg / 6.65 LBS
5 548 Gs
0.45 kg / 1.00 LBS
453 g / 4.4 N
2.72 kg / 5.99 LBS
~0 Gs
3 mm 2.30 kg / 5.08 LBS
4 847 Gs
0.35 kg / 0.76 LBS
346 g / 3.4 N
2.07 kg / 4.57 LBS
~0 Gs
5 mm 1.25 kg / 2.76 LBS
3 575 Gs
0.19 kg / 0.41 LBS
188 g / 1.8 N
1.13 kg / 2.49 LBS
~0 Gs
10 mm 0.25 kg / 0.55 LBS
1 591 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
0.22 kg / 0.49 LBS
~0 Gs
20 mm 0.02 kg / 0.04 LBS
410 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
39 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
23 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
15 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
10 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
7 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
5 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Protective zones (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

Table 8: Dynamics (cracking risk) - collision effects
MW 9x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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

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)

Table 10: Electrical data (Flux)
MW 9x3 / N38

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

Table 11: Physics of underwater searching
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (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 Pc (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 Pc 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%
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: 010108-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Check out more products

The offered product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø9x3 mm, guarantees optimal power. The MW 9x3 / N38 component features high dimensional repeatability and professional build quality, making it an ideal solution for professional 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. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. 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 low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. 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 available off-the-shelf in our store.
This model is characterized by dimensions Ø9x3 mm, which, at a weight of 1.43 g, makes it an element with impressive 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 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 9 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 as well as weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth surface of silver, the element is aesthetically pleasing,
  • Magnets have extremely high magnetic induction on the outer layer,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of individual forming as well as modifying to precise needs,
  • Huge importance in electronics industry – they are utilized in computer drives, electromotive mechanisms, diagnostic systems, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of producing threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

The load parameter shown represents the peak performance, recorded under ideal test conditions, meaning:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • with direct contact (without impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to the following factors, starting with the most relevant:
  • Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Dust explosion hazard

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

Magnets are brittle

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Handling guide

Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and do not underestimate their power.

Hand protection

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Electronic devices

Do not bring magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Magnetic interference

Be aware: rare earth magnets produce a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.

Medical implants

Patients with a ICD have to maintain an large gap from magnets. The magnetism can stop the operation of the implant.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Metal Allergy

Some people have a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling can result in dermatitis. It is best to use protective gloves.

No play value

These products are not toys. Swallowing multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and necessitates immediate surgery.

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