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
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Technical parameters of the product - 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 simulation of the assembly - data
Presented values constitute the direct effect of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Treat these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - interaction chart
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
|
medium risk |
| 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: Sliding hold (wall)
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 (shearing) - 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 resistance (stability) - thermal limit
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: Magnet-Magnet interaction (attraction) - forces in the system
MW 12x50 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (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 (implants) - precautionary measures
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 (kinetic energy) - 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: Corrosion resistance
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 (Pc)
MW 12x50 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 230 Mx | 82.3 µWb |
| Pc Coefficient | 1.49 | High (Stable) |
Table 11: Physics of underwater searching
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. Sliding resistance
*Note: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Power loss vs temp
*For N38 material, the max working temp 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.
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
Pros as well as cons of neodymium magnets.
Pros
- They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- Neodymium magnets are exceptionally resistant to magnetic field loss caused by magnetic disturbances,
- Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- 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...
- Thanks to the option of accurate molding and adaptation to unique projects, NdFeB magnets can be created in a variety of forms and dimensions, which amplifies use scope,
- Significant place in electronics industry – they are utilized in magnetic memories, brushless drives, advanced medical instruments, as well as technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as 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 oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - magnet mounting.
- Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is a challenge,
Pull force analysis
Maximum magnetic pulling force – what affects it?
- on a plate made of mild steel, effectively closing the magnetic field
- with a cross-section minimum 10 mm
- characterized by lack of roughness
- under conditions of gap-free contact (metal-to-metal)
- for force applied at a right angle (in the magnet axis)
- at room temperature
Magnet lifting force in use – key factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
- Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Do not overheat magnets
Do not overheat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Safe distance
Intense magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.
Choking Hazard
Always keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.
Nickel coating and allergies
Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling may cause a rash. We recommend use safety gloves.
Serious injuries
Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
Protective goggles
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Handling rules
Handle with care. Rare earth magnets act from a distance and snap with massive power, often quicker than you can move away.
Medical implants
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Impact on smartphones
Navigation devices and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
Machining danger
Powder generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
