MW 5x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010084
GTIN/EAN: 5906301810834
Diameter Ø
5 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
2.21 g
Magnetization Direction
↑ axial
Load capacity
0.48 kg / 4.68 N
Magnetic Induction
610.03 mT / 6100 Gs
Coating
[NiCuNi] Nickel
1.107 ZŁ with VAT / pcs + price for transport
0.900 ZŁ net + 23% VAT / pcs
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Technical - MW 5x15 / N38 - cylindrical magnet
Specification / characteristics - MW 5x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010084 |
| GTIN/EAN | 5906301810834 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 2.21 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.48 kg / 4.68 N |
| Magnetic Induction ~ ? | 610.03 mT / 6100 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 analysis of the product - report
Presented values constitute the direct effect of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Treat these data as a supplementary guide when designing systems.
Table 1: Static pull force (force vs distance) - characteristics
MW 5x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6091 Gs
609.1 mT
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
safe |
| 1 mm |
3823 Gs
382.3 mT
|
0.19 kg / 0.42 pounds
189.1 g / 1.9 N
|
safe |
| 2 mm |
2261 Gs
226.1 mT
|
0.07 kg / 0.15 pounds
66.1 g / 0.6 N
|
safe |
| 3 mm |
1378 Gs
137.8 mT
|
0.02 kg / 0.05 pounds
24.6 g / 0.2 N
|
safe |
| 5 mm |
607 Gs
60.7 mT
|
0.00 kg / 0.01 pounds
4.8 g / 0.0 N
|
safe |
| 10 mm |
154 Gs
15.4 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
safe |
| 15 mm |
63 Gs
6.3 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
| 20 mm |
32 Gs
3.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 30 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear load (vertical surface)
MW 5x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
|
| 1 mm | Stal (~0.2) |
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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 5x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.14 kg / 0.32 pounds
144.0 g / 1.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.24 kg / 0.53 pounds
240.0 g / 2.4 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 5x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| 1 mm |
|
0.12 kg / 0.26 pounds
120.0 g / 1.2 N
|
| 2 mm |
|
0.24 kg / 0.53 pounds
240.0 g / 2.4 N
|
| 3 mm |
|
0.36 kg / 0.79 pounds
360.0 g / 3.5 N
|
| 5 mm |
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
| 10 mm |
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
| 11 mm |
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
| 12 mm |
|
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 5x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
|
OK |
| 40 °C | -2.2% |
0.47 kg / 1.03 pounds
469.4 g / 4.6 N
|
OK |
| 60 °C | -4.4% |
0.46 kg / 1.01 pounds
458.9 g / 4.5 N
|
OK |
| 80 °C | -6.6% |
0.45 kg / 0.99 pounds
448.3 g / 4.4 N
|
|
| 100 °C | -28.8% |
0.34 kg / 0.75 pounds
341.8 g / 3.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 5x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.49 kg / 9.90 pounds
6 154 Gs
|
0.67 kg / 1.49 pounds
674 g / 6.6 N
|
N/A |
| 1 mm |
2.91 kg / 6.42 pounds
9 810 Gs
|
0.44 kg / 0.96 pounds
437 g / 4.3 N
|
2.62 kg / 5.78 pounds
~0 Gs
|
| 2 mm |
1.77 kg / 3.90 pounds
7 646 Gs
|
0.27 kg / 0.59 pounds
265 g / 2.6 N
|
1.59 kg / 3.51 pounds
~0 Gs
|
| 3 mm |
1.05 kg / 2.31 pounds
5 880 Gs
|
0.16 kg / 0.35 pounds
157 g / 1.5 N
|
0.94 kg / 2.08 pounds
~0 Gs
|
| 5 mm |
0.37 kg / 0.82 pounds
3 507 Gs
|
0.06 kg / 0.12 pounds
56 g / 0.5 N
|
0.34 kg / 0.74 pounds
~0 Gs
|
| 10 mm |
0.04 kg / 0.10 pounds
1 213 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
309 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
37 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
16 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
11 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
8 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
6 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MW 5x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 4.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 5x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
14.87 km/h
(4.13 m/s)
|
0.02 J | |
| 30 mm |
25.74 km/h
(7.15 m/s)
|
0.06 J | |
| 50 mm |
33.23 km/h
(9.23 m/s)
|
0.09 J | |
| 100 mm |
47.00 km/h
(13.06 m/s)
|
0.19 J |
Table 9: Coating parameters (durability)
MW 5x15 / 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 5x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 382 Mx | 13.8 µWb |
| Pc Coefficient | 1.38 | High (Stable) |
Table 11: Physics of underwater searching
MW 5x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.48 kg | Standard |
| Water (riverbed) |
0.55 kg
(+0.07 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical wall, the magnet retains only a fraction of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically 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) = 1.38
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.
Chemical composition
| 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 products
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
- Neodymium magnets are characterized by remarkably resistant to demagnetization caused by magnetic disturbances,
- By using a shiny coating of silver, the element presents an professional look,
- Magnets are characterized by excellent magnetic induction on the active area,
- 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...
- Possibility of precise forming and modifying to concrete needs,
- Versatile presence in modern technologies – they find application in computer drives, electric drive systems, precision medical tools, also other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- 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 and corrosion.
- Limited possibility of making threads in the magnet and complex shapes - preferred is a housing - magnetic holder.
- Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Maximum lifting capacity of the magnet – what it depends on?
- on a base made of mild steel, optimally conducting the magnetic field
- possessing a massiveness of min. 10 mm to ensure full flux closure
- with a plane perfectly flat
- without the slightest air gap between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at ambient temperature room level
Key elements affecting lifting force
- Clearance – the presence of any layer (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel type – mild steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of neodymium magnets
Power loss in heat
Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.
Finger safety
Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
Do not give to children
NdFeB magnets are not intended for children. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.
GPS Danger
Remember: rare earth magnets produce a field that interferes with sensitive sensors. Keep a separation from your mobile, tablet, and GPS.
Metal Allergy
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and choose versions in plastic housing.
ICD Warning
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Machining danger
Drilling and cutting of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Magnets are brittle
Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Handling rules
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Safe distance
Intense magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.
