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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 parameters - 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 analysis of the product - data

These information constitute the result of a engineering analysis. Values rely on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - 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: Slippage hold (wall)
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: Wall mounting (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: Thermal resistance (stability) - power drop
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: Two magnets (attraction) - field range
MW 9x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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: Hazards (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
Timepiece 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 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

Table 8: Dynamics (cracking risk) - warning
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 (Pc)
MW 9x3 / N38

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

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Thermal stability

*For N38 grade, the max working temp 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
Chemical composition
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%
Environmental data
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
Force (pull)

Magnetic Induction

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This product is an incredibly powerful cylinder magnet, manufactured from durable NdFeB material, which, with dimensions of Ø9x3 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 1.94 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 18.99 N with a weight of only 1.43 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, specialized industrial adhesives 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 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. 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 available off-the-shelf 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 secures it against oxidation, 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 through the diameter if your project requires it.

Pros and cons of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose power, even over around ten years – the drop in lifting capacity is only ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • Thanks to the reflective finish, the plating of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • 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 versatility in shaping and the ability to customize to unusual requirements,
  • Significant place in electronics industry – they serve a role in mass storage devices, electric drive systems, medical equipment, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these devices can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The specified lifting capacity concerns the peak performance, obtained under ideal test conditions, namely:
  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Key elements affecting lifting force

It is worth knowing that the working load will differ depending on elements below, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, 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).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Material composition – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Cards and drives

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Maximum temperature

Avoid heat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

No play value

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

Precision electronics

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Health Danger

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Metal Allergy

Studies show that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and select coated magnets.

Respect the power

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Fragile material

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them breaking into small pieces.

Serious injuries

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Important! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98