MW 12x6 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010021
GTIN/EAN: 5906301810209
Diameter Ø
12 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
5.09 g
Magnetization Direction
↑ axial
Load capacity
4.60 kg / 45.09 N
Magnetic Induction
437.99 mT / 4380 Gs
Coating
[NiCuNi] Nickel
1.882 ZŁ with VAT / pcs + price for transport
1.530 ZŁ net + 23% VAT / pcs
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Technical parameters of the product - MW 12x6 / N38 - cylindrical magnet
Specification / characteristics - MW 12x6 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010021 |
| GTIN/EAN | 5906301810209 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 5.09 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.60 kg / 45.09 N |
| Magnetic Induction ~ ? | 437.99 mT / 4380 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 modeling of the product - report
The following information constitute the outcome of a engineering simulation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these calculations as a reference point when designing systems.
Table 1: Static force (force vs gap) - interaction chart
MW 12x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4377 Gs
437.7 mT
|
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
warning |
| 1 mm |
3688 Gs
368.8 mT
|
3.27 kg / 7.20 lbs
3265.4 g / 32.0 N
|
warning |
| 2 mm |
2999 Gs
299.9 mT
|
2.16 kg / 4.76 lbs
2159.7 g / 21.2 N
|
warning |
| 3 mm |
2386 Gs
238.6 mT
|
1.37 kg / 3.01 lbs
1366.7 g / 13.4 N
|
weak grip |
| 5 mm |
1474 Gs
147.4 mT
|
0.52 kg / 1.15 lbs
521.4 g / 5.1 N
|
weak grip |
| 10 mm |
489 Gs
48.9 mT
|
0.06 kg / 0.13 lbs
57.4 g / 0.6 N
|
weak grip |
| 15 mm |
205 Gs
20.5 mT
|
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
|
weak grip |
| 20 mm |
103 Gs
10.3 mT
|
0.00 kg / 0.01 lbs
2.5 g / 0.0 N
|
weak grip |
| 30 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
weak grip |
| 50 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage capacity (wall)
MW 12x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.92 kg / 2.03 lbs
920.0 g / 9.0 N
|
| 1 mm | Stal (~0.2) |
0.65 kg / 1.44 lbs
654.0 g / 6.4 N
|
| 2 mm | Stal (~0.2) |
0.43 kg / 0.95 lbs
432.0 g / 4.2 N
|
| 3 mm | Stal (~0.2) |
0.27 kg / 0.60 lbs
274.0 g / 2.7 N
|
| 5 mm | Stal (~0.2) |
0.10 kg / 0.23 lbs
104.0 g / 1.0 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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: Vertical assembly (shearing) - behavior on slippery surfaces
MW 12x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.38 kg / 3.04 lbs
1380.0 g / 13.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.92 kg / 2.03 lbs
920.0 g / 9.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.46 kg / 1.01 lbs
460.0 g / 4.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.30 kg / 5.07 lbs
2300.0 g / 22.6 N
|
Table 4: Steel thickness (saturation) - power losses
MW 12x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.46 kg / 1.01 lbs
460.0 g / 4.5 N
|
| 1 mm |
|
1.15 kg / 2.54 lbs
1150.0 g / 11.3 N
|
| 2 mm |
|
2.30 kg / 5.07 lbs
2300.0 g / 22.6 N
|
| 3 mm |
|
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
|
| 5 mm |
|
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
| 10 mm |
|
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
| 11 mm |
|
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
| 12 mm |
|
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
Table 5: Thermal resistance (stability) - power drop
MW 12x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
|
OK |
| 40 °C | -2.2% |
4.50 kg / 9.92 lbs
4498.8 g / 44.1 N
|
OK |
| 60 °C | -4.4% |
4.40 kg / 9.70 lbs
4397.6 g / 43.1 N
|
|
| 80 °C | -6.6% |
4.30 kg / 9.47 lbs
4296.4 g / 42.1 N
|
|
| 100 °C | -28.8% |
3.28 kg / 7.22 lbs
3275.2 g / 32.1 N
|
Table 6: Two magnets (attraction) - forces in the system
MW 12x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
13.36 kg / 29.45 lbs
5 536 Gs
|
2.00 kg / 4.42 lbs
2004 g / 19.7 N
|
N/A |
| 1 mm |
11.39 kg / 25.10 lbs
8 082 Gs
|
1.71 kg / 3.77 lbs
1708 g / 16.8 N
|
10.25 kg / 22.59 lbs
~0 Gs
|
| 2 mm |
9.48 kg / 20.91 lbs
7 376 Gs
|
1.42 kg / 3.14 lbs
1423 g / 14.0 N
|
8.54 kg / 18.82 lbs
~0 Gs
|
| 3 mm |
7.77 kg / 17.12 lbs
6 675 Gs
|
1.17 kg / 2.57 lbs
1165 g / 11.4 N
|
6.99 kg / 15.41 lbs
~0 Gs
|
| 5 mm |
5.01 kg / 11.05 lbs
5 361 Gs
|
0.75 kg / 1.66 lbs
752 g / 7.4 N
|
4.51 kg / 9.94 lbs
~0 Gs
|
| 10 mm |
1.51 kg / 3.34 lbs
2 948 Gs
|
0.23 kg / 0.50 lbs
227 g / 2.2 N
|
1.36 kg / 3.01 lbs
~0 Gs
|
| 20 mm |
0.17 kg / 0.37 lbs
978 Gs
|
0.02 kg / 0.06 lbs
25 g / 0.2 N
|
0.15 kg / 0.33 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
116 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
72 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
48 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
33 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
24 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
18 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 12x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.0 cm |
| Remote | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 12x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
30.55 km/h
(8.49 m/s)
|
0.18 J | |
| 30 mm |
52.51 km/h
(14.59 m/s)
|
0.54 J | |
| 50 mm |
67.79 km/h
(18.83 m/s)
|
0.90 J | |
| 100 mm |
95.87 km/h
(26.63 m/s)
|
1.81 J |
Table 9: Corrosion resistance
MW 12x6 / 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 12x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 024 Mx | 50.2 µWb |
| Pc Coefficient | 0.59 | Low (Flat) |
Table 11: Physics of underwater searching
MW 12x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.60 kg | Standard |
| Water (riverbed) |
5.27 kg
(+0.67 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical surface, the magnet holds just a fraction of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Heat tolerance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.59
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths and weaknesses of Nd2Fe14B magnets.
Strengths
- They retain attractive force for almost 10 years – the loss is just ~1% (based on simulations),
- Magnets effectively resist against loss of magnetization caused by foreign field sources,
- Thanks to the shimmering finish, the layer of nickel, gold-plated, or silver gives an elegant appearance,
- Magnets have excellent 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...
- Considering the possibility of flexible shaping and adaptation to specialized needs, neodymium magnets can be manufactured in a wide range of shapes and sizes, which increases their versatility,
- Wide application in advanced technology sectors – they are utilized in HDD drives, electric motors, medical equipment, and multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their power 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
- They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Pull force analysis
Maximum holding power of the magnet – what contributes to it?
- on a block made of structural steel, perfectly concentrating the magnetic field
- possessing a massiveness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- with total lack of distance (no paint)
- for force acting at a right angle (pull-off, not shear)
- in temp. approx. 20°C
What influences lifting capacity in practice
- Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Load vector – maximum parameter is obtained 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).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
- Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
- Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
Warnings
Bodily injuries
Large magnets can break fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.
ICD Warning
Individuals with a ICD have to keep an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.
Keep away from children
Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of kids and pets.
Demagnetization risk
Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.
Mechanical processing
Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Nickel coating and allergies
Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.
Electronic hazard
Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).
Fragile material
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.
Respect the power
Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
GPS and phone interference
Note: rare earth magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and navigation systems.
