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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
0.920 zł net / pcs
1.132 zł with VAT (23% VAT) / pcs
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical - 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 |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 simulation of the assembly - technical parameters
Presented information constitute the outcome of a engineering simulation. Results were calculated on algorithms for the material Nd2Fe14B. Operational conditions may deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
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 LBS
1390.0 g / 13.6 N
|
safe |
| 1 mm |
1753 Gs
175.3 mT
|
1.11 kg / 2.45 LBS
1113.5 g / 10.9 N
|
safe |
| 2 mm |
1479 Gs
147.9 mT
|
0.79 kg / 1.75 LBS
791.7 g / 7.8 N
|
safe |
| 3 mm |
1196 Gs
119.6 mT
|
0.52 kg / 1.14 LBS
518.4 g / 5.1 N
|
safe |
| 5 mm |
738 Gs
73.8 mT
|
0.20 kg / 0.44 LBS
197.4 g / 1.9 N
|
safe |
| 10 mm |
229 Gs
22.9 mT
|
0.02 kg / 0.04 LBS
19.0 g / 0.2 N
|
safe |
| 15 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.01 LBS
2.9 g / 0.0 N
|
safe |
| 20 mm |
43 Gs
4.3 mT
|
0.00 kg / 0.00 LBS
0.7 g / 0.0 N
|
safe |
| 30 mm |
14 Gs
1.4 mT
|
0.00 kg / 0.00 LBS
0.1 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 load (vertical surface)
MW 12x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.28 kg / 0.61 LBS
278.0 g / 2.7 N
|
| 1 mm | Stal (~0.2) |
0.22 kg / 0.49 LBS
222.0 g / 2.2 N
|
| 2 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
158.0 g / 1.5 N
|
| 3 mm | Stal (~0.2) |
0.10 kg / 0.23 LBS
104.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.09 LBS
40.0 g / 0.4 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 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 (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 LBS
417.0 g / 4.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.28 kg / 0.61 LBS
278.0 g / 2.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.14 kg / 0.31 LBS
139.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.70 kg / 1.53 LBS
695.0 g / 6.8 N
|
Table 4: Material efficiency (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 LBS
139.0 g / 1.4 N
|
| 1 mm |
|
0.35 kg / 0.77 LBS
347.5 g / 3.4 N
|
| 2 mm |
|
0.70 kg / 1.53 LBS
695.0 g / 6.8 N
|
| 3 mm |
|
1.04 kg / 2.30 LBS
1042.5 g / 10.2 N
|
| 5 mm |
|
1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
|
| 10 mm |
|
1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
|
| 11 mm |
|
1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
|
| 12 mm |
|
1.39 kg / 3.06 LBS
1390.0 g / 13.6 N
|
Table 5: Thermal stability (material behavior) - 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 LBS
1390.0 g / 13.6 N
|
OK |
| 40 °C | -2.2% |
1.36 kg / 3.00 LBS
1359.4 g / 13.3 N
|
OK |
| 60 °C | -4.4% |
1.33 kg / 2.93 LBS
1328.8 g / 13.0 N
|
|
| 80 °C | -6.6% |
1.30 kg / 2.86 LBS
1298.3 g / 12.7 N
|
|
| 100 °C | -28.8% |
0.99 kg / 2.18 LBS
989.7 g / 9.7 N
|
Table 6: Magnet-Magnet interaction (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 LBS
3 435 Gs
|
0.40 kg / 0.88 LBS
401 g / 3.9 N
|
N/A |
| 1 mm |
2.44 kg / 5.37 LBS
3 739 Gs
|
0.37 kg / 0.81 LBS
366 g / 3.6 N
|
2.19 kg / 4.84 LBS
~0 Gs
|
| 2 mm |
2.14 kg / 4.73 LBS
3 507 Gs
|
0.32 kg / 0.71 LBS
322 g / 3.2 N
|
1.93 kg / 4.25 LBS
~0 Gs
|
| 3 mm |
1.83 kg / 4.04 LBS
3 241 Gs
|
0.27 kg / 0.61 LBS
275 g / 2.7 N
|
1.65 kg / 3.63 LBS
~0 Gs
|
| 5 mm |
1.24 kg / 2.74 LBS
2 671 Gs
|
0.19 kg / 0.41 LBS
187 g / 1.8 N
|
1.12 kg / 2.47 LBS
~0 Gs
|
| 10 mm |
0.38 kg / 0.84 LBS
1 476 Gs
|
0.06 kg / 0.13 LBS
57 g / 0.6 N
|
0.34 kg / 0.75 LBS
~0 Gs
|
| 20 mm |
0.04 kg / 0.08 LBS
458 Gs
|
0.01 kg / 0.01 LBS
5 g / 0.1 N
|
0.03 kg / 0.07 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
47 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
28 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
18 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
13 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
9 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
7 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~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 |
| 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 (kinetic energy) - warning
MW 12x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.16 km/h
(6.71 m/s)
|
0.04 J | |
| 30 mm |
24.32 km/h
(6.75 m/s)
|
0.04 J | |
| 50 mm |
24.32 km/h
(6.76 m/s)
|
0.04 J | |
| 100 mm |
24.32 km/h
(6.76 m/s)
|
0.04 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 (Pc)
MW 12x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 665 Mx | 26.7 µWb |
| Pc Coefficient | 0.25 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
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. Sliding resistance
*Note: On a vertical surface, the magnet holds merely ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*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) = 0.25
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.
Material specification
| 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros as well as cons of neodymium magnets.
Advantages
- They do not lose magnetism, even after nearly 10 years – the drop in power is only ~1% (theoretically),
- Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by external field sources,
- Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
- Magnets exhibit impressive magnetic induction on the working surface,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Possibility of individual creating as well as adapting to concrete requirements,
- Huge importance in high-tech industry – they serve a role in magnetic memories, motor assemblies, medical devices, also other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions
Limitations
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of creating nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what it depends on?
- using a sheet made of mild steel, acting as a circuit closing element
- possessing a thickness of minimum 10 mm to ensure full flux closure
- with a surface cleaned and smooth
- without any insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at temperature room level
Key elements affecting lifting force
- Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be escaped into the air.
- Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
- Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the holding force.
Warnings
Protective goggles
NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them cracking into shards.
Adults only
Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.
Crushing force
Large magnets can smash fingers in a fraction of a second. Never place your hand between two strong magnets.
Power loss in heat
Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.
Electronic devices
Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Metal Allergy
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop handling magnets and wear gloves.
Combustion hazard
Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.
Phone sensors
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
ICD Warning
Patients with a ICD should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.
Respect the power
Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.
