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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Technical specification of the product - 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 |
Physical analysis of the magnet - data
The following data are the outcome of a physical calculation. Values are based on models for the class Nd2Fe14B. Operational performance may differ from theoretical values. Use these data as a reference point during assembly planning.
Table 1: Static pull force (pull 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: Shear capacity (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: Vertical assembly (sliding) - behavior on slippery surfaces
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 (substrate influence) - 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) - resistance threshold
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) | Shear 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) (implants) - 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 |
| Mobile device | 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 (kinetic energy) - collision effects
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: Coating parameters (durability)
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: Electrical 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: Submerged application
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. Shear force
*Note: On a vertical surface, the magnet holds only a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*For N38 material, the safety 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.
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 |
Other offers
Advantages as well as disadvantages of rare earth magnets.
Pros
- They do not lose strength, even over nearly 10 years – the drop in strength is only ~1% (theoretically),
- Magnets perfectly protect themselves against demagnetization caused by external fields,
- Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
- Possibility of precise creating as well as adjusting to concrete conditions,
- Significant place in modern industrial fields – they find application in data components, drive modules, diagnostic systems, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in creating threads and complex forms in magnets, we propose using cover - magnetic mechanism.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, small components of these devices can complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum magnetic pulling force – what contributes to it?
- using a plate made of high-permeability steel, functioning as a ideal flux conductor
- possessing a thickness of min. 10 mm to ensure full flux closure
- with a plane free of scratches
- under conditions of no distance (metal-to-metal)
- during detachment in a direction perpendicular to the plane
- in neutral thermal conditions
Determinants of practical lifting force of a magnet
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
- Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, 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, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of neodymium magnets
Hand protection
Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.
Danger to the youngest
Neodymium magnets are not intended for children. Eating multiple magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.
Allergic reactions
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.
Implant safety
People with a heart stimulator should maintain an large gap from magnets. The magnetism can disrupt the functioning of the life-saving device.
Respect the power
Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can move away.
Impact on smartphones
An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.
Protective goggles
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Do not drill into magnets
Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Do not overheat magnets
Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).
Safe distance
Avoid bringing magnets near a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.
