MW 15x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010028
GTIN/EAN: 5906301810278
Diameter Ø
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
2.65 g
Magnetization Direction
↑ axial
Load capacity
1.51 kg / 14.84 N
Magnetic Induction
159.70 mT / 1597 Gs
Coating
[NiCuNi] Nickel
1.218 ZŁ with VAT / pcs + price for transport
0.990 ZŁ net + 23% VAT / pcs
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Physical properties - MW 15x2 / N38 - cylindrical magnet
Specification / characteristics - MW 15x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010028 |
| GTIN/EAN | 5906301810278 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 15 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 2.65 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.51 kg / 14.84 N |
| Magnetic Induction ~ ? | 159.70 mT / 1597 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 magnet - report
The following data represent the direct effect of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.
Table 1: Static force (pull vs gap) - power drop
MW 15x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1597 Gs
159.7 mT
|
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
safe |
| 1 mm |
1483 Gs
148.3 mT
|
1.30 kg / 2.87 lbs
1303.0 g / 12.8 N
|
safe |
| 2 mm |
1320 Gs
132.0 mT
|
1.03 kg / 2.28 lbs
1032.2 g / 10.1 N
|
safe |
| 3 mm |
1137 Gs
113.7 mT
|
0.77 kg / 1.69 lbs
765.0 g / 7.5 N
|
safe |
| 5 mm |
791 Gs
79.1 mT
|
0.37 kg / 0.82 lbs
370.8 g / 3.6 N
|
safe |
| 10 mm |
298 Gs
29.8 mT
|
0.05 kg / 0.12 lbs
52.5 g / 0.5 N
|
safe |
| 15 mm |
127 Gs
12.7 mT
|
0.01 kg / 0.02 lbs
9.6 g / 0.1 N
|
safe |
| 20 mm |
63 Gs
6.3 mT
|
0.00 kg / 0.01 lbs
2.4 g / 0.0 N
|
safe |
| 30 mm |
22 Gs
2.2 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding load (vertical surface)
MW 15x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.30 kg / 0.67 lbs
302.0 g / 3.0 N
|
| 1 mm | Stal (~0.2) |
0.26 kg / 0.57 lbs
260.0 g / 2.6 N
|
| 2 mm | Stal (~0.2) |
0.21 kg / 0.45 lbs
206.0 g / 2.0 N
|
| 3 mm | Stal (~0.2) |
0.15 kg / 0.34 lbs
154.0 g / 1.5 N
|
| 5 mm | Stal (~0.2) |
0.07 kg / 0.16 lbs
74.0 g / 0.7 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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 (shearing) - vertical pull
MW 15x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.45 kg / 1.00 lbs
453.0 g / 4.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.30 kg / 0.67 lbs
302.0 g / 3.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.15 kg / 0.33 lbs
151.0 g / 1.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.76 kg / 1.66 lbs
755.0 g / 7.4 N
|
Table 4: Material efficiency (saturation) - power losses
MW 15x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.15 kg / 0.33 lbs
151.0 g / 1.5 N
|
| 1 mm |
|
0.38 kg / 0.83 lbs
377.5 g / 3.7 N
|
| 2 mm |
|
0.76 kg / 1.66 lbs
755.0 g / 7.4 N
|
| 3 mm |
|
1.13 kg / 2.50 lbs
1132.5 g / 11.1 N
|
| 5 mm |
|
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
| 10 mm |
|
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
| 11 mm |
|
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
| 12 mm |
|
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
Table 5: Working in heat (stability) - resistance threshold
MW 15x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.51 kg / 3.33 lbs
1510.0 g / 14.8 N
|
OK |
| 40 °C | -2.2% |
1.48 kg / 3.26 lbs
1476.8 g / 14.5 N
|
OK |
| 60 °C | -4.4% |
1.44 kg / 3.18 lbs
1443.6 g / 14.2 N
|
|
| 80 °C | -6.6% |
1.41 kg / 3.11 lbs
1410.3 g / 13.8 N
|
|
| 100 °C | -28.8% |
1.08 kg / 2.37 lbs
1075.1 g / 10.5 N
|
Table 6: Two magnets (attraction) - field collision
MW 15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.78 kg / 6.12 lbs
2 915 Gs
|
0.42 kg / 0.92 lbs
417 g / 4.1 N
|
N/A |
| 1 mm |
2.61 kg / 5.76 lbs
3 096 Gs
|
0.39 kg / 0.86 lbs
392 g / 3.8 N
|
2.35 kg / 5.18 lbs
~0 Gs
|
| 2 mm |
2.40 kg / 5.28 lbs
2 966 Gs
|
0.36 kg / 0.79 lbs
360 g / 3.5 N
|
2.16 kg / 4.76 lbs
~0 Gs
|
| 3 mm |
2.15 kg / 4.75 lbs
2 812 Gs
|
0.32 kg / 0.71 lbs
323 g / 3.2 N
|
1.94 kg / 4.27 lbs
~0 Gs
|
| 5 mm |
1.65 kg / 3.63 lbs
2 459 Gs
|
0.25 kg / 0.54 lbs
247 g / 2.4 N
|
1.48 kg / 3.27 lbs
~0 Gs
|
| 10 mm |
0.68 kg / 1.50 lbs
1 582 Gs
|
0.10 kg / 0.23 lbs
102 g / 1.0 N
|
0.61 kg / 1.35 lbs
~0 Gs
|
| 20 mm |
0.10 kg / 0.21 lbs
595 Gs
|
0.01 kg / 0.03 lbs
14 g / 0.1 N
|
0.09 kg / 0.19 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
71 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
43 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
28 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
19 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
14 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
10 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 15x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MW 15x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.59 km/h
(6.83 m/s)
|
0.06 J | |
| 30 mm |
41.70 km/h
(11.58 m/s)
|
0.18 J | |
| 50 mm |
53.83 km/h
(14.95 m/s)
|
0.30 J | |
| 100 mm |
76.13 km/h
(21.15 m/s)
|
0.59 J |
Table 9: Corrosion resistance
MW 15x2 / 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 15x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 541 Mx | 35.4 µWb |
| Pc Coefficient | 0.20 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 15x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.51 kg | Standard |
| Water (riverbed) |
1.73 kg
(+0.22 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.20
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 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Strengths
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
- Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by external magnetic fields,
- Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold, or silver gives an visually attractive appearance,
- Magnetic induction on the working part of the magnet remains maximum,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
- Possibility of exact modeling and modifying to complex applications,
- Fundamental importance in future technologies – they find application in hard drives, electric drive systems, medical devices, and technologically advanced constructions.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in creating threads and complex forms in magnets, we propose using cover - magnetic mechanism.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum lifting force for a neodymium magnet – what contributes to it?
- on a block made of mild steel, perfectly concentrating the magnetic field
- whose thickness equals approx. 10 mm
- with an polished touching surface
- without any insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the plane
- at standard ambient temperature
Practical aspects of lifting capacity – factors
- Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Stainless steels may attract less.
- Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
Serious injuries
Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Do not overheat magnets
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Safe distance
Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Risk of cracking
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets will cause them cracking into shards.
Do not give to children
NdFeB magnets are not intended for children. Accidental ingestion of a few magnets may result in them attracting across intestines, which poses a critical condition and requires immediate surgery.
Impact on smartphones
A powerful magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Keep magnets close to a smartphone to prevent breaking the sensors.
Warning for heart patients
Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.
Powerful field
Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Dust is flammable
Dust produced during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Skin irritation risks
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and wear gloves.
