MW 15x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010029
GTIN/EAN: 5906301810285
Diameter Ø
15 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
3.98 g
Magnetization Direction
↑ axial
Load capacity
2.87 kg / 28.14 N
Magnetic Induction
230.16 mT / 2302 Gs
Coating
[NiCuNi] Nickel
1.624 ZŁ with VAT / pcs + price for transport
1.320 ZŁ net + 23% VAT / pcs
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Physical properties - MW 15x3 / N38 - cylindrical magnet
Specification / characteristics - MW 15x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010029 |
| GTIN/EAN | 5906301810285 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 15 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 3.98 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.87 kg / 28.14 N |
| Magnetic Induction ~ ? | 230.16 mT / 2302 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 magnet - data
Presented values are the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these calculations as a reference point for designers.
Table 1: Static pull force (force vs gap) - power drop
MW 15x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2301 Gs
230.1 mT
|
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
medium risk |
| 1 mm |
2098 Gs
209.8 mT
|
2.39 kg / 5.26 pounds
2386.5 g / 23.4 N
|
medium risk |
| 2 mm |
1842 Gs
184.2 mT
|
1.84 kg / 4.05 pounds
1838.5 g / 18.0 N
|
weak grip |
| 3 mm |
1570 Gs
157.0 mT
|
1.34 kg / 2.95 pounds
1337.0 g / 13.1 N
|
weak grip |
| 5 mm |
1084 Gs
108.4 mT
|
0.64 kg / 1.40 pounds
637.0 g / 6.2 N
|
weak grip |
| 10 mm |
410 Gs
41.0 mT
|
0.09 kg / 0.20 pounds
91.3 g / 0.9 N
|
weak grip |
| 15 mm |
178 Gs
17.8 mT
|
0.02 kg / 0.04 pounds
17.1 g / 0.2 N
|
weak grip |
| 20 mm |
89 Gs
8.9 mT
|
0.00 kg / 0.01 pounds
4.3 g / 0.0 N
|
weak grip |
| 30 mm |
31 Gs
3.1 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
weak grip |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical load (vertical surface)
MW 15x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.57 kg / 1.27 pounds
574.0 g / 5.6 N
|
| 1 mm | Stal (~0.2) |
0.48 kg / 1.05 pounds
478.0 g / 4.7 N
|
| 2 mm | Stal (~0.2) |
0.37 kg / 0.81 pounds
368.0 g / 3.6 N
|
| 3 mm | Stal (~0.2) |
0.27 kg / 0.59 pounds
268.0 g / 2.6 N
|
| 5 mm | Stal (~0.2) |
0.13 kg / 0.28 pounds
128.0 g / 1.3 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 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 (sliding) - vertical pull
MW 15x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.86 kg / 1.90 pounds
861.0 g / 8.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.57 kg / 1.27 pounds
574.0 g / 5.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.29 kg / 0.63 pounds
287.0 g / 2.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.44 kg / 3.16 pounds
1435.0 g / 14.1 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 15x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.29 kg / 0.63 pounds
287.0 g / 2.8 N
|
| 1 mm |
|
0.72 kg / 1.58 pounds
717.5 g / 7.0 N
|
| 2 mm |
|
1.44 kg / 3.16 pounds
1435.0 g / 14.1 N
|
| 3 mm |
|
2.15 kg / 4.75 pounds
2152.5 g / 21.1 N
|
| 5 mm |
|
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
| 10 mm |
|
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
| 11 mm |
|
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
| 12 mm |
|
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MW 15x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
|
OK |
| 40 °C | -2.2% |
2.81 kg / 6.19 pounds
2806.9 g / 27.5 N
|
OK |
| 60 °C | -4.4% |
2.74 kg / 6.05 pounds
2743.7 g / 26.9 N
|
|
| 80 °C | -6.6% |
2.68 kg / 5.91 pounds
2680.6 g / 26.3 N
|
|
| 100 °C | -28.8% |
2.04 kg / 4.51 pounds
2043.4 g / 20.0 N
|
Table 6: Two magnets (attraction) - field collision
MW 15x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.77 kg / 12.72 pounds
3 869 Gs
|
0.87 kg / 1.91 pounds
865 g / 8.5 N
|
N/A |
| 1 mm |
5.32 kg / 11.73 pounds
4 419 Gs
|
0.80 kg / 1.76 pounds
798 g / 7.8 N
|
4.79 kg / 10.55 pounds
~0 Gs
|
| 2 mm |
4.80 kg / 10.57 pounds
4 196 Gs
|
0.72 kg / 1.59 pounds
719 g / 7.1 N
|
4.32 kg / 9.52 pounds
~0 Gs
|
| 3 mm |
4.25 kg / 9.36 pounds
3 948 Gs
|
0.64 kg / 1.40 pounds
637 g / 6.2 N
|
3.82 kg / 8.42 pounds
~0 Gs
|
| 5 mm |
3.17 kg / 6.99 pounds
3 412 Gs
|
0.48 kg / 1.05 pounds
476 g / 4.7 N
|
2.85 kg / 6.29 pounds
~0 Gs
|
| 10 mm |
1.28 kg / 2.82 pounds
2 168 Gs
|
0.19 kg / 0.42 pounds
192 g / 1.9 N
|
1.15 kg / 2.54 pounds
~0 Gs
|
| 20 mm |
0.18 kg / 0.40 pounds
821 Gs
|
0.03 kg / 0.06 pounds
28 g / 0.3 N
|
0.17 kg / 0.36 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 pounds
101 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
62 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
41 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
28 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
20 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
15 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MW 15x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MW 15x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.62 km/h
(7.67 m/s)
|
0.12 J | |
| 30 mm |
46.91 km/h
(13.03 m/s)
|
0.34 J | |
| 50 mm |
60.56 km/h
(16.82 m/s)
|
0.56 J | |
| 100 mm |
85.64 km/h
(23.79 m/s)
|
1.13 J |
Table 9: Coating parameters (durability)
MW 15x3 / 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 15x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 718 Mx | 47.2 µWb |
| Pc Coefficient | 0.29 | Low (Flat) |
Table 11: Submerged application
MW 15x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.87 kg | Standard |
| Water (riverbed) |
3.29 kg
(+0.42 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet holds just a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Power loss vs temp
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros and cons of neodymium magnets.
Benefits
- They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
- Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
- By applying a reflective layer of nickel, the element has an professional look,
- Magnetic induction on the surface of the magnet is maximum,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of precise forming and optimizing to concrete needs,
- Versatile presence in modern technologies – they are commonly used in magnetic memories, drive modules, advanced medical instruments, as well as modern systems.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Limitations
- To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets suffer 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic mount.
- Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components 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
Best holding force of the magnet in ideal parameters – what affects it?
- with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- with a thickness of at least 10 mm
- with an polished contact surface
- under conditions of ideal adhesion (metal-to-metal)
- under perpendicular force vector (90-degree angle)
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Cast iron may attract less.
- Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Precautions when working with neodymium magnets
Protect data
Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Metal Allergy
Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact or choose encased magnets.
Keep away from children
Always store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.
Medical implants
Individuals with a ICD should keep an large gap from magnets. The magnetism can stop the operation of the implant.
Crushing force
Risk of injury: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.
Impact on smartphones
GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Do not overheat magnets
Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and strength.
Protective goggles
Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Do not underestimate power
Use magnets consciously. Their immense force can shock even professionals. Be vigilant and respect their force.
Combustion hazard
Dust created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
