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 of the product - 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 |
Technical modeling of the magnet - report
The following information represent the outcome of a engineering simulation. Results are based on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these data as a reference point when designing systems.
Table 1: Static force (force vs gap) - 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 pounds
7370.0 g / 72.3 N
|
medium risk |
| 1 mm |
3944 Gs
394.4 mT
|
5.62 kg / 12.38 pounds
5616.2 g / 55.1 N
|
medium risk |
| 2 mm |
3362 Gs
336.2 mT
|
4.08 kg / 9.00 pounds
4083.1 g / 40.1 N
|
medium risk |
| 3 mm |
2820 Gs
282.0 mT
|
2.87 kg / 6.33 pounds
2871.9 g / 28.2 N
|
medium risk |
| 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: Vertical 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: Wall mounting (shearing) - behavior on slippery surfaces
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 (saturation) - 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: 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 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: Two magnets (repulsion) - forces in the system
MW 15x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Safety (HSE) (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 |
| Timepiece | 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: 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: Anti-corrosion coating durability
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 (Pc)
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 wall, the magnet holds merely a fraction of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Temperature resistance
*For standard magnets, the max working temp 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 products
Advantages as well as disadvantages of neodymium magnets.
Advantages
- They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They are extremely resistant to demagnetization induced by external magnetic fields,
- In other words, due to the aesthetic layer of gold, the element gains a professional look,
- Magnetic induction on the top side of the magnet turns out to be maximum,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Due to the option of accurate forming and customization to custom needs, NdFeB magnets can be modeled in a variety of forms and dimensions, which increases their versatility,
- Significant place in advanced technology sectors – they find application in computer drives, electric drive systems, medical equipment, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of producing nuts in the magnet and complicated shapes - preferred is casing - magnetic holder.
- Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, 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.
- With mass production the cost of neodymium magnets is a challenge,
Pull force analysis
Maximum holding power of the magnet – what contributes to it?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a massiveness of min. 10 mm to ensure full flux closure
- with an ideally smooth contact surface
- without the slightest insulating layer between the magnet and steel
- during pulling in a direction vertical to the plane
- at ambient temperature room level
Key elements affecting lifting force
- Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
- Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
- Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Conscious usage
Handle with care. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.
Physical harm
Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.
Danger to the youngest
Strictly store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.
Cards and drives
Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Thermal limits
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
GPS and phone interference
Note: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and navigation systems.
Shattering risk
Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.
Avoid contact if allergic
It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.
Implant safety
Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Mechanical processing
Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
