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
4.00 ZŁ net + 23% VAT / pcs
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Technical details - 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 - report
Presented values are the outcome of a engineering analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - interaction chart
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 pounds
7370.0 g / 72.3 N
|
strong |
| 1 mm |
3944 Gs
394.4 mT
|
5.62 kg / 12.38 pounds
5616.2 g / 55.1 N
|
strong |
| 2 mm |
3362 Gs
336.2 mT
|
4.08 kg / 9.00 pounds
4083.1 g / 40.1 N
|
strong |
| 3 mm |
2820 Gs
282.0 mT
|
2.87 kg / 6.33 pounds
2871.9 g / 28.2 N
|
strong |
| 5 mm |
1931 Gs
193.1 mT
|
1.35 kg / 2.97 pounds
1346.9 g / 13.2 N
|
weak grip |
| 10 mm |
763 Gs
76.3 mT
|
0.21 kg / 0.46 pounds
210.3 g / 2.1 N
|
weak grip |
| 15 mm |
349 Gs
34.9 mT
|
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
|
weak grip |
| 20 mm |
184 Gs
18.4 mT
|
0.01 kg / 0.03 pounds
12.2 g / 0.1 N
|
weak grip |
| 30 mm |
68 Gs
6.8 mT
|
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
|
weak grip |
| 50 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
weak grip |
Table 2: Shear load (wall)
MW 15x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
|
| 1 mm | Stal (~0.2) |
1.12 kg / 2.48 pounds
1124.0 g / 11.0 N
|
| 2 mm | Stal (~0.2) |
0.82 kg / 1.80 pounds
816.0 g / 8.0 N
|
| 3 mm | Stal (~0.2) |
0.57 kg / 1.27 pounds
574.0 g / 5.6 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.60 pounds
270.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.04 kg / 0.09 pounds
42.0 g / 0.4 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (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 pounds
2211.0 g / 21.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.74 kg / 1.62 pounds
737.0 g / 7.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 15x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.74 kg / 1.62 pounds
737.0 g / 7.2 N
|
| 1 mm |
|
1.84 kg / 4.06 pounds
1842.5 g / 18.1 N
|
| 2 mm |
|
3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
|
| 3 mm |
|
5.53 kg / 12.19 pounds
5527.5 g / 54.2 N
|
| 5 mm |
|
7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
|
| 10 mm |
|
7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
|
| 11 mm |
|
7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
|
| 12 mm |
|
7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
|
Table 5: Working in heat (material behavior) - power drop
MW 15x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
|
OK |
| 40 °C | -2.2% |
7.21 kg / 15.89 pounds
7207.9 g / 70.7 N
|
OK |
| 60 °C | -4.4% |
7.05 kg / 15.53 pounds
7045.7 g / 69.1 N
|
OK |
| 80 °C | -6.6% |
6.88 kg / 15.18 pounds
6883.6 g / 67.5 N
|
|
| 100 °C | -28.8% |
5.25 kg / 11.57 pounds
5247.4 g / 51.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 15x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
22.23 kg / 49.02 pounds
5 606 Gs
|
3.34 kg / 7.35 pounds
3335 g / 32.7 N
|
N/A |
| 1 mm |
19.55 kg / 43.11 pounds
8 473 Gs
|
2.93 kg / 6.47 pounds
2933 g / 28.8 N
|
17.60 kg / 38.80 pounds
~0 Gs
|
| 2 mm |
16.94 kg / 37.35 pounds
7 887 Gs
|
2.54 kg / 5.60 pounds
2541 g / 24.9 N
|
15.25 kg / 33.62 pounds
~0 Gs
|
| 3 mm |
14.52 kg / 32.00 pounds
7 301 Gs
|
2.18 kg / 4.80 pounds
2178 g / 21.4 N
|
13.07 kg / 28.80 pounds
~0 Gs
|
| 5 mm |
10.37 kg / 22.85 pounds
6 169 Gs
|
1.55 kg / 3.43 pounds
1555 g / 15.3 N
|
9.33 kg / 20.57 pounds
~0 Gs
|
| 10 mm |
4.06 kg / 8.96 pounds
3 862 Gs
|
0.61 kg / 1.34 pounds
609 g / 6.0 N
|
3.66 kg / 8.06 pounds
~0 Gs
|
| 20 mm |
0.63 kg / 1.40 pounds
1 526 Gs
|
0.10 kg / 0.21 pounds
95 g / 0.9 N
|
0.57 kg / 1.26 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 pounds
215 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 pounds
136 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
91 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
64 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
46 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
35 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (electronics) - warnings
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 |
| Car key | 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: Impact energy (cracking risk) - collision effects
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: Surface protection spec
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: Electrical 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: Physics of underwater searching
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. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*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.
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% |
Ecology and recycling (GPSR)
| 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 neodymium magnets.
Advantages
- They have constant strength, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- They are noted for resistance to demagnetization induced by external field influence,
- A magnet with a shiny silver surface has better aesthetics,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to modularity in designing and the capacity to customize to unusual requirements,
- Huge importance in modern technologies – they serve a role in magnetic memories, motor assemblies, precision medical tools, as well as complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- We recommend cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
- Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what it depends on?
- on a base made of mild steel, effectively closing the magnetic field
- with a cross-section of at least 10 mm
- characterized by even structure
- with zero gap (no coatings)
- during detachment in a direction vertical to the mounting surface
- at room temperature
What influences lifting capacity in practice
- Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
- Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.
Safety rules for work with neodymium magnets
Hand protection
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Product not for children
Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.
Shattering risk
Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.
Nickel coating and allergies
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.
Dust explosion hazard
Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.
Immense force
Handle magnets consciously. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.
Do not overheat magnets
Avoid heat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
Pacemakers
Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Data carriers
Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Precision electronics
An intense magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.
