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 details - 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 |
Physical modeling of the product - report
Presented information represent the outcome of a engineering analysis. Values are based on models for the material Nd2Fe14B. Real-world conditions may differ. Please consider these calculations as a reference point for designers.
Table 1: Static pull 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 pounds
1940.0 g / 19.0 N
|
safe |
| 1 mm |
2774 Gs
277.4 mT
|
1.27 kg / 2.79 pounds
1266.5 g / 12.4 N
|
safe |
| 2 mm |
2090 Gs
209.0 mT
|
0.72 kg / 1.59 pounds
719.2 g / 7.1 N
|
safe |
| 3 mm |
1521 Gs
152.1 mT
|
0.38 kg / 0.84 pounds
380.7 g / 3.7 N
|
safe |
| 5 mm |
795 Gs
79.5 mT
|
0.10 kg / 0.23 pounds
104.1 g / 1.0 N
|
safe |
| 10 mm |
205 Gs
20.5 mT
|
0.01 kg / 0.02 pounds
6.9 g / 0.1 N
|
safe |
| 15 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
safe |
| 20 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
| 30 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Sliding capacity (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 pounds
388.0 g / 3.8 N
|
| 1 mm | Stal (~0.2) |
0.25 kg / 0.56 pounds
254.0 g / 2.5 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.32 pounds
144.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.17 pounds
76.0 g / 0.7 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
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 pounds
582.0 g / 5.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.39 kg / 0.86 pounds
388.0 g / 3.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.43 pounds
194.0 g / 1.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.97 kg / 2.14 pounds
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/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.43 pounds
194.0 g / 1.9 N
|
| 1 mm |
|
0.49 kg / 1.07 pounds
485.0 g / 4.8 N
|
| 2 mm |
|
0.97 kg / 2.14 pounds
970.0 g / 9.5 N
|
| 3 mm |
|
1.46 kg / 3.21 pounds
1455.0 g / 14.3 N
|
| 5 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 10 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 11 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
| 12 mm |
|
1.94 kg / 4.28 pounds
1940.0 g / 19.0 N
|
Table 5: Thermal stability (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 pounds
1940.0 g / 19.0 N
|
OK |
| 40 °C | -2.2% |
1.90 kg / 4.18 pounds
1897.3 g / 18.6 N
|
OK |
| 60 °C | -4.4% |
1.85 kg / 4.09 pounds
1854.6 g / 18.2 N
|
|
| 80 °C | -6.6% |
1.81 kg / 3.99 pounds
1812.0 g / 17.8 N
|
|
| 100 °C | -28.8% |
1.38 kg / 3.05 pounds
1381.3 g / 13.6 N
|
Table 6: Two magnets (attraction) - field collision
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 pounds
4 949 Gs
|
0.69 kg / 1.53 pounds
693 g / 6.8 N
|
N/A |
| 1 mm |
3.82 kg / 8.43 pounds
6 244 Gs
|
0.57 kg / 1.26 pounds
573 g / 5.6 N
|
3.44 kg / 7.58 pounds
~0 Gs
|
| 2 mm |
3.02 kg / 6.65 pounds
5 548 Gs
|
0.45 kg / 1.00 pounds
453 g / 4.4 N
|
2.72 kg / 5.99 pounds
~0 Gs
|
| 3 mm |
2.30 kg / 5.08 pounds
4 847 Gs
|
0.35 kg / 0.76 pounds
346 g / 3.4 N
|
2.07 kg / 4.57 pounds
~0 Gs
|
| 5 mm |
1.25 kg / 2.76 pounds
3 575 Gs
|
0.19 kg / 0.41 pounds
188 g / 1.8 N
|
1.13 kg / 2.49 pounds
~0 Gs
|
| 10 mm |
0.25 kg / 0.55 pounds
1 591 Gs
|
0.04 kg / 0.08 pounds
37 g / 0.4 N
|
0.22 kg / 0.49 pounds
~0 Gs
|
| 20 mm |
0.02 kg / 0.04 pounds
410 Gs
|
0.00 kg / 0.01 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
39 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
23 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
15 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
7 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
5 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~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 |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 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: Collisions (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: 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: 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% |
1. Sliding resistance
*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin steel (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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Advantages and disadvantages of rare earth magnets.
Pros
- They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- They possess excellent resistance to magnetism drop due to opposing magnetic fields,
- The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of precise forming and optimizing to complex conditions,
- Wide application in modern industrial fields – they find application in magnetic memories, electromotive mechanisms, diagnostic systems, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in small systems
Cons
- At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We recommend casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
- Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Highest magnetic holding force – what contributes to it?
- using a base made of low-carbon steel, acting as a magnetic yoke
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with a plane free of scratches
- without the slightest clearance between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at room temperature
Impact of factors on magnetic holding capacity in practice
- Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Base massiveness – insufficiently thick plate causes magnetic saturation, causing part of the power to be lost to the other side.
- Steel grade – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
- Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.
Precautions when working with NdFeB magnets
Demagnetization risk
Avoid heat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Physical harm
Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Fire warning
Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.
Fragile material
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.
Electronic devices
Do not bring magnets near a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.
Nickel coating and allergies
Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and opt for coated magnets.
No play value
Always store magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.
Impact on smartphones
A powerful magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets near a device to avoid breaking the sensors.
Medical interference
Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.
Conscious usage
Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can react.
