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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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Product card - 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 - data

Presented data constitute the outcome of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Treat these data as a reference point when designing systems.

Table 1: Static force (pull 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: Shear 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: Wall mounting (shearing) - behavior on slippery surfaces
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 (saturation) - power losses
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 (material behavior) - 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 collision
MW 9x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 (electronics) - warnings
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
Mobile device 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: Impact energy (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: 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)

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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

*For N38 material, the critical 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%
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: 010108-2026
Measurement Calculator
Force (pull)

Magnetic Induction

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The offered product is an extremely powerful cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø9x3 mm, guarantees the highest energy density. The MW 9x3 / N38 component boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.94 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application 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 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 two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability 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 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 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. Such an arrangement is standard 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.

Advantages and disadvantages of neodymium magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the elegant finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • Magnets exhibit exceptionally strong magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of accurate molding and customization to specialized solutions, magnetic components can be produced in a wide range of forms and dimensions, which increases their versatility,
  • Huge importance in innovative solutions – they are used in HDD drives, drive modules, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex forms in magnets, we propose using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity was determined for the most favorable conditions, including:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ground contact surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

In real-world applications, the actual holding force depends on several key aspects, ranked from most significant:
  • Distance (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the flux to be lost to the other side.
  • Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Warnings
Heat warning

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.

Machining danger

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Magnetic interference

Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Metal Allergy

Certain individuals have a sensitization to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause dermatitis. We strongly advise wear safety gloves.

Keep away from computers

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

This is not a toy

Always store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are very dangerous.

Medical interference

People with a pacemaker have to keep an large gap from magnets. The magnetism can disrupt the functioning of the life-saving device.

Pinching danger

Danger of trauma: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Material brittleness

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Safe operation

Use magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their force.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98