MW 8x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010102
GTIN/EAN: 5906301811015
- Diameter Ø
- 8 mm [±0,1 mm]
- Height
- 15 mm [±0,1 mm]
- Weight
- 5.65 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
3.44 zł with VAT / pcs + price for transport
2.80 zł net + 23% VAT / pcs
bulk discounts:
Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Product card - MW 8x15 / N38 - cylindrical magnet
Specification / characteristics - MW 8x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010102 |
| GTIN/EAN | 5906301811015 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 5.65 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.47 kg / 14.45 N |
| Magnetic Induction ~ ? | 598.12 mT / 5981 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 simulation of the magnet - technical parameters
Presented information are the direct effect of a physical analysis. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these calculations as a reference point for designers.
Table 1: Static force (pull vs distance) - power drop
MW 8x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5975 Gs
597.5 mT
|
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
weak grip |
| 1 mm |
4511 Gs
451.1 mT
|
0.84 kg / 1.85 LBS
837.8 g / 8.2 N
|
weak grip |
| 2 mm |
3262 Gs
326.2 mT
|
0.44 kg / 0.97 LBS
438.2 g / 4.3 N
|
weak grip |
| 3 mm |
2332 Gs
233.2 mT
|
0.22 kg / 0.49 LBS
224.0 g / 2.2 N
|
weak grip |
| 5 mm |
1238 Gs
123.8 mT
|
0.06 kg / 0.14 LBS
63.1 g / 0.6 N
|
weak grip |
| 10 mm |
366 Gs
36.6 mT
|
0.01 kg / 0.01 LBS
5.5 g / 0.1 N
|
weak grip |
| 15 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
|
weak grip |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
weak grip |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding load (wall)
MW 8x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.29 kg / 0.65 LBS
294.0 g / 2.9 N
|
| 1 mm | Stal (~0.2) |
0.17 kg / 0.37 LBS
168.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.19 LBS
88.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 LBS
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 8x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.44 kg / 0.97 LBS
441.0 g / 4.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.29 kg / 0.65 LBS
294.0 g / 2.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.15 kg / 0.32 LBS
147.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.74 kg / 1.62 LBS
735.0 g / 7.2 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 8x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.15 kg / 0.32 LBS
147.0 g / 1.4 N
|
| 1 mm |
|
0.37 kg / 0.81 LBS
367.5 g / 3.6 N
|
| 2 mm |
|
0.74 kg / 1.62 LBS
735.0 g / 7.2 N
|
| 3 mm |
|
1.10 kg / 2.43 LBS
1102.5 g / 10.8 N
|
| 5 mm |
|
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
| 10 mm |
|
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
| 11 mm |
|
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
| 12 mm |
|
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MW 8x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.47 kg / 3.24 LBS
1470.0 g / 14.4 N
|
OK |
| 40 °C | -2.2% |
1.44 kg / 3.17 LBS
1437.7 g / 14.1 N
|
OK |
| 60 °C | -4.4% |
1.41 kg / 3.10 LBS
1405.3 g / 13.8 N
|
OK |
| 80 °C | -6.6% |
1.37 kg / 3.03 LBS
1373.0 g / 13.5 N
|
|
| 100 °C | -28.8% |
1.05 kg / 2.31 LBS
1046.6 g / 10.3 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 8x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
11.06 kg / 24.39 LBS
6 130 Gs
|
1.66 kg / 3.66 LBS
1660 g / 16.3 N
|
N/A |
| 1 mm |
8.49 kg / 18.72 LBS
10 469 Gs
|
1.27 kg / 2.81 LBS
1274 g / 12.5 N
|
7.64 kg / 16.85 LBS
~0 Gs
|
| 2 mm |
6.31 kg / 13.90 LBS
9 022 Gs
|
0.95 kg / 2.09 LBS
946 g / 9.3 N
|
5.68 kg / 12.51 LBS
~0 Gs
|
| 3 mm |
4.59 kg / 10.12 LBS
7 697 Gs
|
0.69 kg / 1.52 LBS
688 g / 6.8 N
|
4.13 kg / 9.11 LBS
~0 Gs
|
| 5 mm |
2.36 kg / 5.20 LBS
5 516 Gs
|
0.35 kg / 0.78 LBS
354 g / 3.5 N
|
2.12 kg / 4.68 LBS
~0 Gs
|
| 10 mm |
0.48 kg / 1.05 LBS
2 476 Gs
|
0.07 kg / 0.16 LBS
71 g / 0.7 N
|
0.43 kg / 0.94 LBS
~0 Gs
|
| 20 mm |
0.04 kg / 0.09 LBS
731 Gs
|
0.01 kg / 0.01 LBS
6 g / 0.1 N
|
0.04 kg / 0.08 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
94 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
60 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
41 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
29 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
21 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
16 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 8x15 / 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 |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 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: Dynamics (kinetic energy) - warning
MW 8x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
10.47 km/h
(2.91 m/s)
|
0.02 J | |
| 30 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J | |
| 50 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J | |
| 100 mm |
10.51 km/h
(2.92 m/s)
|
0.02 J |
Table 9: Surface protection spec
MW 8x15 / 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 8x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 306 Mx | 33.1 µWb |
| Pc Coefficient | 1.19 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 8x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.47 kg | Standard |
| Water (riverbed) |
1.68 kg
(+0.21 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely limits the holding force.
3. Heat tolerance
*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) = 1.19
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 deals
Advantages as well as disadvantages of neodymium magnets.
Strengths
- They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
- They are extremely resistant to demagnetization induced by external field influence,
- A magnet with a smooth silver surface has an effective appearance,
- Magnetic induction on the surface of the magnet turns out to be impressive,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to versatility in designing and the ability to customize to complex applications,
- Universal use in modern industrial fields – they find application in hard drives, brushless drives, diagnostic systems, also technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Limitations
- At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum lifting capacity of the magnet – what it depends on?
- using a plate made of mild steel, serving as a magnetic yoke
- with a thickness no less than 10 mm
- characterized by even structure
- under conditions of gap-free contact (surface-to-surface)
- for force acting at a right angle (in the magnet axis)
- at ambient temperature approx. 20 degrees Celsius
Practical lifting capacity: influencing factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
- Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. 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 checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the load capacity.
Warnings
This is not a toy
Strictly store magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are very dangerous.
Magnetic media
Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Dust explosion hazard
Dust generated during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Nickel coating and allergies
Medical facts indicate that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and choose coated magnets.
Crushing risk
Pinching hazard: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.
ICD Warning
Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.
Demagnetization risk
Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).
Powerful field
Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can move away.
Keep away from electronics
Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Material brittleness
Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them breaking into small pieces.
