MW 9x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010108
GTIN/EAN: 5906301811077
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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Technical specification of the product - MW 9x3 / N38 - cylindrical magnet
Specification / characteristics - MW 9x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010108 |
| GTIN/EAN | 5906301811077 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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 simulation of the assembly - technical parameters
Presented information constitute the outcome of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Treat these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs distance) - power drop
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 |
Table 2: Shear capacity (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
|
Table 3: Vertical assembly (shearing) - 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
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 9x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 194.0 g
1.9 N
|
| 1 mm |
|
0.49 kg / 485.0 g
4.8 N
|
| 2 mm |
|
0.97 kg / 970.0 g
9.5 N
|
| 5 mm |
|
1.94 kg / 1940.0 g
19.0 N
|
| 10 mm |
|
1.94 kg / 1940.0 g
19.0 N
|
Table 5: Thermal stability (stability) - 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
|
Table 6: Magnet-Magnet interaction (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
|
Table 7: Hazards (implants) - 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 |
| Timepiece | 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: Construction 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: 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% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains only ~20% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Heat tolerance
*For standard magnets, 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of neodymium magnets.
Strengths
- They retain full power for around 10 years – the drop is just ~1% (according to analyses),
- Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
- Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver gives an clean appearance,
- Magnets are characterized by impressive magnetic induction on the outer layer,
- 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...
- Possibility of accurate forming and adapting to complex needs,
- Versatile presence in future technologies – they serve a role in magnetic memories, drive modules, medical devices, as well as multitasking production systems.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
- They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Limited possibility of creating threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what it depends on?
- with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
- with a thickness no less than 10 mm
- with an polished contact surface
- with zero gap (without coatings)
- during pulling in a direction vertical to the plane
- in neutral thermal conditions
Lifting capacity in practice – influencing factors
- Clearance – existence of any layer (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
- Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the load capacity.
Precautions when working with NdFeB magnets
Nickel allergy
It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select versions in plastic housing.
Hand protection
Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Health Danger
For implant holders: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.
Beware of splinters
Neodymium magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.
Choking Hazard
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are fatal.
Respect the power
Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.
Heat warning
Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.
Safe distance
Data protection: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, timepieces).
Threat to navigation
Remember: neodymium magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.
Do not drill into magnets
Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.
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