MW 15x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010032
GTIN/EAN: 5906301810315
Diameter Ø
15 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
10.6 g
Magnetization Direction
↑ axial
Load capacity
7.37 kg / 72.28 N
Magnetic Induction
451.96 mT / 4520 Gs
Coating
[NiCuNi] Nickel
4.92 ZŁ with VAT / pcs + price for transport
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Technical - MW 15x8 / N38 - cylindrical magnet
Specification / characteristics - MW 15x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010032 |
| GTIN/EAN | 5906301810315 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 15 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 10.6 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 7.37 kg / 72.28 N |
| Magnetic Induction ~ ? | 451.96 mT / 4520 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 - technical parameters
The following information constitute the direct effect of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational conditions may differ. Use these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs distance) - power drop
MW 15x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4518 Gs
451.8 mT
|
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
warning |
| 1 mm |
3944 Gs
394.4 mT
|
5.62 kg / 12.38 lbs
5616.2 g / 55.1 N
|
warning |
| 2 mm |
3362 Gs
336.2 mT
|
4.08 kg / 9.00 lbs
4083.1 g / 40.1 N
|
warning |
| 3 mm |
2820 Gs
282.0 mT
|
2.87 kg / 6.33 lbs
2871.9 g / 28.2 N
|
warning |
| 5 mm |
1931 Gs
193.1 mT
|
1.35 kg / 2.97 lbs
1346.9 g / 13.2 N
|
low risk |
| 10 mm |
763 Gs
76.3 mT
|
0.21 kg / 0.46 lbs
210.3 g / 2.1 N
|
low risk |
| 15 mm |
349 Gs
34.9 mT
|
0.04 kg / 0.10 lbs
44.0 g / 0.4 N
|
low risk |
| 20 mm |
184 Gs
18.4 mT
|
0.01 kg / 0.03 lbs
12.2 g / 0.1 N
|
low risk |
| 30 mm |
68 Gs
6.8 mT
|
0.00 kg / 0.00 lbs
1.7 g / 0.0 N
|
low risk |
| 50 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
Table 2: Shear hold (wall)
MW 15x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.47 kg / 3.25 lbs
1474.0 g / 14.5 N
|
| 1 mm | Stal (~0.2) |
1.12 kg / 2.48 lbs
1124.0 g / 11.0 N
|
| 2 mm | Stal (~0.2) |
0.82 kg / 1.80 lbs
816.0 g / 8.0 N
|
| 3 mm | Stal (~0.2) |
0.57 kg / 1.27 lbs
574.0 g / 5.6 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.60 lbs
270.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.04 kg / 0.09 lbs
42.0 g / 0.4 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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) - vertical pull
MW 15x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.21 kg / 4.87 lbs
2211.0 g / 21.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.47 kg / 3.25 lbs
1474.0 g / 14.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.74 kg / 1.62 lbs
737.0 g / 7.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.69 kg / 8.12 lbs
3685.0 g / 36.1 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 15x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.74 kg / 1.62 lbs
737.0 g / 7.2 N
|
| 1 mm |
|
1.84 kg / 4.06 lbs
1842.5 g / 18.1 N
|
| 2 mm |
|
3.69 kg / 8.12 lbs
3685.0 g / 36.1 N
|
| 3 mm |
|
5.53 kg / 12.19 lbs
5527.5 g / 54.2 N
|
| 5 mm |
|
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
| 10 mm |
|
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
| 11 mm |
|
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
| 12 mm |
|
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 15x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.37 kg / 16.25 lbs
7370.0 g / 72.3 N
|
OK |
| 40 °C | -2.2% |
7.21 kg / 15.89 lbs
7207.9 g / 70.7 N
|
OK |
| 60 °C | -4.4% |
7.05 kg / 15.53 lbs
7045.7 g / 69.1 N
|
OK |
| 80 °C | -6.6% |
6.88 kg / 15.18 lbs
6883.6 g / 67.5 N
|
|
| 100 °C | -28.8% |
5.25 kg / 11.57 lbs
5247.4 g / 51.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 15x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
22.23 kg / 49.02 lbs
5 606 Gs
|
3.34 kg / 7.35 lbs
3335 g / 32.7 N
|
N/A |
| 1 mm |
19.55 kg / 43.11 lbs
8 473 Gs
|
2.93 kg / 6.47 lbs
2933 g / 28.8 N
|
17.60 kg / 38.80 lbs
~0 Gs
|
| 2 mm |
16.94 kg / 37.35 lbs
7 887 Gs
|
2.54 kg / 5.60 lbs
2541 g / 24.9 N
|
15.25 kg / 33.62 lbs
~0 Gs
|
| 3 mm |
14.52 kg / 32.00 lbs
7 301 Gs
|
2.18 kg / 4.80 lbs
2178 g / 21.4 N
|
13.07 kg / 28.80 lbs
~0 Gs
|
| 5 mm |
10.37 kg / 22.85 lbs
6 169 Gs
|
1.55 kg / 3.43 lbs
1555 g / 15.3 N
|
9.33 kg / 20.57 lbs
~0 Gs
|
| 10 mm |
4.06 kg / 8.96 lbs
3 862 Gs
|
0.61 kg / 1.34 lbs
609 g / 6.0 N
|
3.66 kg / 8.06 lbs
~0 Gs
|
| 20 mm |
0.63 kg / 1.40 lbs
1 526 Gs
|
0.10 kg / 0.21 lbs
95 g / 0.9 N
|
0.57 kg / 1.26 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 lbs
215 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 lbs
136 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 / 0.00 lbs
91 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
64 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
46 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
35 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MW 15x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 5.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.0 cm |
| Remote | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - warning
MW 15x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.06 km/h
(7.52 m/s)
|
0.30 J | |
| 30 mm |
46.07 km/h
(12.80 m/s)
|
0.87 J | |
| 50 mm |
59.46 km/h
(16.52 m/s)
|
1.45 J | |
| 100 mm |
84.09 km/h
(23.36 m/s)
|
2.89 J |
Table 9: Corrosion resistance
MW 15x8 / 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 15x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 074 Mx | 80.7 µWb |
| Pc Coefficient | 0.61 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 15x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 7.37 kg | Standard |
| Water (riverbed) |
8.44 kg
(+1.07 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Thermal stability
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths as well as weaknesses of Nd2Fe14B magnets.
Pros
- They retain full power for nearly 10 years – the drop is just ~1% (based on simulations),
- They retain their magnetic properties even under strong external field,
- Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
- Magnetic induction on the top side of the magnet remains extremely intense,
- 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...
- Due to the ability of flexible shaping and customization to individualized solutions, NdFeB magnets can be modeled in a variety of shapes and sizes, which increases their versatility,
- Fundamental importance in innovative solutions – they serve a role in HDD drives, brushless drives, diagnostic systems, as well as multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Limited ability of making threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum magnetic pulling force – what affects it?
- with the use of a sheet made of special test steel, ensuring full magnetic saturation
- whose thickness reaches at least 10 mm
- with a surface cleaned and smooth
- without the slightest insulating layer between the magnet and steel
- under axial application of breakaway force (90-degree angle)
- in stable room temperature
What influences lifting capacity in practice
- Air gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Metal 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.
- Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
- Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
- Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.
Safe handling of NdFeB magnets
Fire risk
Machining of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Do not underestimate power
Use magnets consciously. Their huge power can surprise even experienced users. Be vigilant and respect their force.
Impact on smartphones
GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Implant safety
For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.
Magnets are brittle
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Sensitization to coating
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop handling magnets and use protective gear.
Data carriers
Data protection: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Pinching danger
Mind your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Swallowing risk
Adult use only. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.
Demagnetization risk
Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
