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 |
Technical modeling of the assembly - data
The following values are the outcome of a engineering simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull 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 lbs
7370.0 g / 72.3 N
|
medium risk |
| 1 mm |
3944 Gs
394.4 mT
|
5.62 kg / 12.38 lbs
5616.2 g / 55.1 N
|
medium risk |
| 2 mm |
3362 Gs
336.2 mT
|
4.08 kg / 9.00 lbs
4083.1 g / 40.1 N
|
medium risk |
| 3 mm |
2820 Gs
282.0 mT
|
2.87 kg / 6.33 lbs
2871.9 g / 28.2 N
|
medium risk |
| 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: Vertical 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: Vertical assembly (shearing) - 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 (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 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) - resistance threshold
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) - field collision
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 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 |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 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: Dynamics (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: Coating parameters (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 (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. Shear force
*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Temperature resistance
*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) = 0.61
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 |
Other offers
Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- Magnets effectively protect themselves against demagnetization caused by foreign field sources,
- In other words, due to the reflective surface of silver, the element looks attractive,
- Magnetic induction on the top side of the magnet remains very high,
- 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...
- Possibility of exact modeling and adapting to defined conditions,
- Wide application in modern technologies – they are used in magnetic memories, electric drive systems, medical devices, as well as other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices are able to complicate diagnosis medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Pull force analysis
Maximum lifting force for a neodymium magnet – what contributes to it?
- with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose thickness reaches at least 10 mm
- with a surface perfectly flat
- under conditions of no distance (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
What influences lifting capacity in practice
- Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
- Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Safety rules for work with NdFeB magnets
Protective goggles
Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
GPS Danger
An intense magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.
Physical harm
Mind your fingers. Two large magnets will join instantly with a force of massive weight, destroying anything in their path. Be careful!
Demagnetization risk
Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Conscious usage
Handle with care. Rare earth magnets act from a long distance and connect with massive power, often faster than you can move away.
Health Danger
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
No play value
Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Store away from children and animals.
Fire warning
Dust generated during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Cards and drives
Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Avoid contact if allergic
A percentage of the population have a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling might lead to skin redness. It is best to use safety gloves.
