MW 12x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010017
GTIN/EAN: 5906301810162
Diameter Ø
12 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
1.7 g
Magnetization Direction
↑ axial
Load capacity
1.39 kg / 13.66 N
Magnetic Induction
195.97 mT / 1960 Gs
Coating
[NiCuNi] Nickel
1.132 ZŁ with VAT / pcs + price for transport
0.920 ZŁ net + 23% VAT / pcs
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Physical properties - MW 12x2 / N38 - cylindrical magnet
Specification / characteristics - MW 12x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010017 |
| GTIN/EAN | 5906301810162 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 1.7 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.39 kg / 13.66 N |
| Magnetic Induction ~ ? | 195.97 mT / 1960 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 |
Technical modeling of the assembly - technical parameters
The following values constitute the result of a physical simulation. Values rely on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs distance) - interaction chart
MW 12x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1959 Gs
195.9 mT
|
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
low risk |
| 1 mm |
1753 Gs
175.3 mT
|
1.11 kg / 2.45 pounds
1113.5 g / 10.9 N
|
low risk |
| 2 mm |
1479 Gs
147.9 mT
|
0.79 kg / 1.75 pounds
791.7 g / 7.8 N
|
low risk |
| 3 mm |
1196 Gs
119.6 mT
|
0.52 kg / 1.14 pounds
518.4 g / 5.1 N
|
low risk |
| 5 mm |
738 Gs
73.8 mT
|
0.20 kg / 0.44 pounds
197.4 g / 1.9 N
|
low risk |
| 10 mm |
229 Gs
22.9 mT
|
0.02 kg / 0.04 pounds
19.0 g / 0.2 N
|
low risk |
| 15 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.01 pounds
2.9 g / 0.0 N
|
low risk |
| 20 mm |
43 Gs
4.3 mT
|
0.00 kg / 0.00 pounds
0.7 g / 0.0 N
|
low risk |
| 30 mm |
14 Gs
1.4 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical load (wall)
MW 12x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.28 kg / 0.61 pounds
278.0 g / 2.7 N
|
| 1 mm | Stal (~0.2) |
0.22 kg / 0.49 pounds
222.0 g / 2.2 N
|
| 2 mm | Stal (~0.2) |
0.16 kg / 0.35 pounds
158.0 g / 1.5 N
|
| 3 mm | Stal (~0.2) |
0.10 kg / 0.23 pounds
104.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.09 pounds
40.0 g / 0.4 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 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 12x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.42 kg / 0.92 pounds
417.0 g / 4.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.28 kg / 0.61 pounds
278.0 g / 2.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.14 kg / 0.31 pounds
139.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.70 kg / 1.53 pounds
695.0 g / 6.8 N
|
Table 4: Steel thickness (saturation) - power losses
MW 12x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.14 kg / 0.31 pounds
139.0 g / 1.4 N
|
| 1 mm |
|
0.35 kg / 0.77 pounds
347.5 g / 3.4 N
|
| 2 mm |
|
0.70 kg / 1.53 pounds
695.0 g / 6.8 N
|
| 3 mm |
|
1.04 kg / 2.30 pounds
1042.5 g / 10.2 N
|
| 5 mm |
|
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
| 10 mm |
|
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
| 11 mm |
|
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
| 12 mm |
|
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
Table 5: Working in heat (stability) - power drop
MW 12x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.39 kg / 3.06 pounds
1390.0 g / 13.6 N
|
OK |
| 40 °C | -2.2% |
1.36 kg / 3.00 pounds
1359.4 g / 13.3 N
|
OK |
| 60 °C | -4.4% |
1.33 kg / 2.93 pounds
1328.8 g / 13.0 N
|
|
| 80 °C | -6.6% |
1.30 kg / 2.86 pounds
1298.3 g / 12.7 N
|
|
| 100 °C | -28.8% |
0.99 kg / 2.18 pounds
989.7 g / 9.7 N
|
Table 6: Two magnets (repulsion) - field collision
MW 12x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.68 kg / 5.90 pounds
3 435 Gs
|
0.40 kg / 0.88 pounds
401 g / 3.9 N
|
N/A |
| 1 mm |
2.44 kg / 5.37 pounds
3 739 Gs
|
0.37 kg / 0.81 pounds
366 g / 3.6 N
|
2.19 kg / 4.84 pounds
~0 Gs
|
| 2 mm |
2.14 kg / 4.73 pounds
3 507 Gs
|
0.32 kg / 0.71 pounds
322 g / 3.2 N
|
1.93 kg / 4.25 pounds
~0 Gs
|
| 3 mm |
1.83 kg / 4.04 pounds
3 241 Gs
|
0.27 kg / 0.61 pounds
275 g / 2.7 N
|
1.65 kg / 3.63 pounds
~0 Gs
|
| 5 mm |
1.24 kg / 2.74 pounds
2 671 Gs
|
0.19 kg / 0.41 pounds
187 g / 1.8 N
|
1.12 kg / 2.47 pounds
~0 Gs
|
| 10 mm |
0.38 kg / 0.84 pounds
1 476 Gs
|
0.06 kg / 0.13 pounds
57 g / 0.6 N
|
0.34 kg / 0.75 pounds
~0 Gs
|
| 20 mm |
0.04 kg / 0.08 pounds
458 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.1 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
47 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
28 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
18 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
13 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
9 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
7 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MW 12x2 / 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) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 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 12x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.08 km/h
(8.08 m/s)
|
0.06 J | |
| 30 mm |
49.95 km/h
(13.88 m/s)
|
0.16 J | |
| 50 mm |
64.48 km/h
(17.91 m/s)
|
0.27 J | |
| 100 mm |
91.19 km/h
(25.33 m/s)
|
0.55 J |
Table 9: Corrosion resistance
MW 12x2 / 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 12x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 665 Mx | 26.7 µWb |
| Pc Coefficient | 0.25 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 12x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.39 kg | Standard |
| Water (riverbed) |
1.59 kg
(+0.20 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just a fraction of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly weakens the holding force.
3. Heat tolerance
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages as well as disadvantages of Nd2Fe14B magnets.
Benefits
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- Neodymium magnets are characterized by extremely resistant to magnetic field loss caused by external magnetic fields,
- In other words, due to the glossy finish of nickel, the element looks attractive,
- Magnets exhibit impressive magnetic induction on the outer side,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to modularity in designing and the ability to modify to client solutions,
- Significant place in modern technologies – they find application in hard drives, electromotive mechanisms, precision medical tools, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects 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 power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these devices are able to be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Magnetic strength at its maximum – what it depends on?
- using a plate made of high-permeability steel, functioning as a magnetic yoke
- possessing a massiveness of at least 10 mm to avoid saturation
- with an ground touching surface
- under conditions of gap-free contact (metal-to-metal)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature room level
Practical aspects of lifting capacity – factors
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Safety rules for work with neodymium magnets
Sensitization to coating
It is widely known that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, prevent direct skin contact and opt for versions in plastic housing.
Life threat
People with a heart stimulator should maintain an safe separation from magnets. The magnetism can stop the operation of the life-saving device.
Electronic hazard
Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
Permanent damage
Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.
Keep away from electronics
A strong magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets close to a smartphone to avoid damaging the sensors.
Fragile material
NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them cracking into shards.
Fire risk
Machining of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Danger to the youngest
NdFeB magnets are not suitable for play. Accidental ingestion of several magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.
Do not underestimate power
Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and do not underestimate their power.
Hand protection
Pinching hazard: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
