MW 12x50 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010020
GTIN/EAN: 5906301810193
Diameter Ø
12 mm [±0,1 mm]
Height
50 mm [±0,1 mm]
Weight
42.41 g
Magnetization Direction
↑ axial
Load capacity
2.62 kg / 25.73 N
Magnetic Induction
614.94 mT / 6149 Gs
Coating
[NiCuNi] Nickel
28.29 ZŁ with VAT / pcs + price for transport
23.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MW 12x50 / N38 - cylindrical magnet
Specification / characteristics - MW 12x50 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010020 |
| GTIN/EAN | 5906301810193 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 50 mm [±0,1 mm] |
| Weight | 42.41 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.62 kg / 25.73 N |
| Magnetic Induction ~ ? | 614.94 mT / 6149 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 magnet - data
Presented information constitute the result of a engineering simulation. Values were calculated on models for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (force vs distance) - power drop
MW 12x50 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6146 Gs
614.6 mT
|
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
strong |
| 1 mm |
5138 Gs
513.8 mT
|
1.83 kg / 4.04 lbs
1831.5 g / 18.0 N
|
safe |
| 2 mm |
4199 Gs
419.9 mT
|
1.22 kg / 2.70 lbs
1222.9 g / 12.0 N
|
safe |
| 3 mm |
3388 Gs
338.8 mT
|
0.80 kg / 1.76 lbs
796.3 g / 7.8 N
|
safe |
| 5 mm |
2194 Gs
219.4 mT
|
0.33 kg / 0.74 lbs
334.0 g / 3.3 N
|
safe |
| 10 mm |
853 Gs
85.3 mT
|
0.05 kg / 0.11 lbs
50.4 g / 0.5 N
|
safe |
| 15 mm |
417 Gs
41.7 mT
|
0.01 kg / 0.03 lbs
12.1 g / 0.1 N
|
safe |
| 20 mm |
239 Gs
23.9 mT
|
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
safe |
| 30 mm |
103 Gs
10.3 mT
|
0.00 kg / 0.00 lbs
0.7 g / 0.0 N
|
safe |
| 50 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
Table 2: Vertical force (vertical surface)
MW 12x50 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.52 kg / 1.16 lbs
524.0 g / 5.1 N
|
| 1 mm | Stal (~0.2) |
0.37 kg / 0.81 lbs
366.0 g / 3.6 N
|
| 2 mm | Stal (~0.2) |
0.24 kg / 0.54 lbs
244.0 g / 2.4 N
|
| 3 mm | Stal (~0.2) |
0.16 kg / 0.35 lbs
160.0 g / 1.6 N
|
| 5 mm | Stal (~0.2) |
0.07 kg / 0.15 lbs
66.0 g / 0.6 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MW 12x50 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.79 kg / 1.73 lbs
786.0 g / 7.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.52 kg / 1.16 lbs
524.0 g / 5.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.26 kg / 0.58 lbs
262.0 g / 2.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.31 kg / 2.89 lbs
1310.0 g / 12.9 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 12x50 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.26 kg / 0.58 lbs
262.0 g / 2.6 N
|
| 1 mm |
|
0.66 kg / 1.44 lbs
655.0 g / 6.4 N
|
| 2 mm |
|
1.31 kg / 2.89 lbs
1310.0 g / 12.9 N
|
| 3 mm |
|
1.97 kg / 4.33 lbs
1965.0 g / 19.3 N
|
| 5 mm |
|
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
| 10 mm |
|
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
| 11 mm |
|
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
| 12 mm |
|
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
Table 5: Thermal stability (material behavior) - power drop
MW 12x50 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.62 kg / 5.78 lbs
2620.0 g / 25.7 N
|
OK |
| 40 °C | -2.2% |
2.56 kg / 5.65 lbs
2562.4 g / 25.1 N
|
OK |
| 60 °C | -4.4% |
2.50 kg / 5.52 lbs
2504.7 g / 24.6 N
|
OK |
| 80 °C | -6.6% |
2.45 kg / 5.39 lbs
2447.1 g / 24.0 N
|
|
| 100 °C | -28.8% |
1.87 kg / 4.11 lbs
1865.4 g / 18.3 N
|
Table 6: Two magnets (attraction) - field range
MW 12x50 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
26.33 kg / 58.05 lbs
6 179 Gs
|
3.95 kg / 8.71 lbs
3950 g / 38.7 N
|
N/A |
| 1 mm |
22.19 kg / 48.93 lbs
11 284 Gs
|
3.33 kg / 7.34 lbs
3329 g / 32.7 N
|
19.97 kg / 44.04 lbs
~0 Gs
|
| 2 mm |
18.41 kg / 40.58 lbs
10 277 Gs
|
2.76 kg / 6.09 lbs
2761 g / 27.1 N
|
16.57 kg / 36.53 lbs
~0 Gs
|
| 3 mm |
15.11 kg / 33.30 lbs
9 309 Gs
|
2.27 kg / 5.00 lbs
2266 g / 22.2 N
|
13.60 kg / 29.97 lbs
~0 Gs
|
| 5 mm |
9.94 kg / 21.91 lbs
7 551 Gs
|
1.49 kg / 3.29 lbs
1491 g / 14.6 N
|
8.94 kg / 19.72 lbs
~0 Gs
|
| 10 mm |
3.36 kg / 7.40 lbs
4 389 Gs
|
0.50 kg / 1.11 lbs
504 g / 4.9 N
|
3.02 kg / 6.66 lbs
~0 Gs
|
| 20 mm |
0.51 kg / 1.12 lbs
1 706 Gs
|
0.08 kg / 0.17 lbs
76 g / 0.7 N
|
0.46 kg / 1.01 lbs
~0 Gs
|
| 50 mm |
0.02 kg / 0.04 lbs
303 Gs
|
0.00 kg / 0.01 lbs
2 g / 0.0 N
|
0.01 kg / 0.03 lbs
~0 Gs
|
| 60 mm |
0.01 kg / 0.02 lbs
206 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 lbs
148 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
110 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
84 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
66 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MW 12x50 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 6.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.0 cm |
| Car key | 50 Gs (5.0 mT) | 4.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MW 12x50 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
8.02 km/h
(2.23 m/s)
|
0.11 J | |
| 30 mm |
13.73 km/h
(3.81 m/s)
|
0.31 J | |
| 50 mm |
17.73 km/h
(4.92 m/s)
|
0.51 J | |
| 100 mm |
25.07 km/h
(6.96 m/s)
|
1.03 J |
Table 9: Surface protection spec
MW 12x50 / 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 12x50 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 230 Mx | 82.3 µWb |
| Pc Coefficient | 1.49 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 12x50 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.62 kg | Standard |
| Water (riverbed) |
3.00 kg
(+0.38 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet holds merely a fraction of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Thermal stability
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.49
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 |
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Advantages and disadvantages of Nd2Fe14B magnets.
Strengths
- Their power remains stable, and after around 10 years it decreases only by ~1% (theoretically),
- Neodymium magnets are characterized by extremely resistant to magnetic field loss caused by external field sources,
- In other words, due to the aesthetic layer of gold, the element gains visual value,
- Magnetic induction on the working part of the magnet is very high,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of accurate machining and adjusting to precise conditions,
- Wide application in modern industrial fields – they are used in computer drives, electromotive mechanisms, diagnostic systems, as well as other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
- Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- using a sheet made of mild steel, acting as a magnetic yoke
- possessing a thickness of min. 10 mm to avoid saturation
- with an ground contact surface
- without any air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature room level
Impact of factors on magnetic holding capacity in practice
- Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Safe handling of NdFeB magnets
Flammability
Powder created during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Data carriers
Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Caution required
Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.
Danger to the youngest
Neodymium magnets are not suitable for play. Swallowing a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.
Pinching danger
Big blocks can crush fingers in a fraction of a second. Do not place your hand between two strong magnets.
Compass and GPS
GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Heat sensitivity
Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.
Beware of splinters
Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.
Health Danger
People with a heart stimulator have to keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.
Allergic reactions
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation appears, cease working with magnets and use protective gear.
