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
How we measure these parameters — certificates and measurements
2.80 zł net / pcs
3.44 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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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Technical parameters of the product - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 analysis of the assembly - data
These data constitute the direct effect of a mathematical analysis. Values rely on algorithms for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs gap) - 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 pounds
1470.0 g / 14.4 N
|
safe |
| 1 mm |
4511 Gs
451.1 mT
|
0.84 kg / 1.85 pounds
837.8 g / 8.2 N
|
safe |
| 2 mm |
3262 Gs
326.2 mT
|
0.44 kg / 0.97 pounds
438.2 g / 4.3 N
|
safe |
| 3 mm |
2332 Gs
233.2 mT
|
0.22 kg / 0.49 pounds
224.0 g / 2.2 N
|
safe |
| 5 mm |
1238 Gs
123.8 mT
|
0.06 kg / 0.14 pounds
63.1 g / 0.6 N
|
safe |
| 10 mm |
366 Gs
36.6 mT
|
0.01 kg / 0.01 pounds
5.5 g / 0.1 N
|
safe |
| 15 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
safe |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
safe |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Vertical force (vertical surface)
MW 8x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.29 kg / 0.65 pounds
294.0 g / 2.9 N
|
| 1 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.09 kg / 0.19 pounds
88.0 g / 0.9 N
|
| 3 mm | Stal (~0.2) |
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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: Vertical assembly (sliding) - 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 pounds
441.0 g / 4.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.29 kg / 0.65 pounds
294.0 g / 2.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.15 kg / 0.32 pounds
147.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.74 kg / 1.62 pounds
735.0 g / 7.2 N
|
Table 4: Steel thickness (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 pounds
147.0 g / 1.4 N
|
| 1 mm |
|
0.37 kg / 0.81 pounds
367.5 g / 3.6 N
|
| 2 mm |
|
0.74 kg / 1.62 pounds
735.0 g / 7.2 N
|
| 3 mm |
|
1.10 kg / 2.43 pounds
1102.5 g / 10.8 N
|
| 5 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 10 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 11 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
| 12 mm |
|
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
Table 5: Thermal resistance (stability) - power drop
MW 8x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
|
OK |
| 40 °C | -2.2% |
1.44 kg / 3.17 pounds
1437.7 g / 14.1 N
|
OK |
| 60 °C | -4.4% |
1.41 kg / 3.10 pounds
1405.3 g / 13.8 N
|
OK |
| 80 °C | -6.6% |
1.37 kg / 3.03 pounds
1373.0 g / 13.5 N
|
|
| 100 °C | -28.8% |
1.05 kg / 2.31 pounds
1046.6 g / 10.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
11.06 kg / 24.39 pounds
6 130 Gs
|
1.66 kg / 3.66 pounds
1660 g / 16.3 N
|
N/A |
| 1 mm |
8.49 kg / 18.72 pounds
10 469 Gs
|
1.27 kg / 2.81 pounds
1274 g / 12.5 N
|
7.64 kg / 16.85 pounds
~0 Gs
|
| 2 mm |
6.31 kg / 13.90 pounds
9 022 Gs
|
0.95 kg / 2.09 pounds
946 g / 9.3 N
|
5.68 kg / 12.51 pounds
~0 Gs
|
| 3 mm |
4.59 kg / 10.12 pounds
7 697 Gs
|
0.69 kg / 1.52 pounds
688 g / 6.8 N
|
4.13 kg / 9.11 pounds
~0 Gs
|
| 5 mm |
2.36 kg / 5.20 pounds
5 516 Gs
|
0.35 kg / 0.78 pounds
354 g / 3.5 N
|
2.12 kg / 4.68 pounds
~0 Gs
|
| 10 mm |
0.48 kg / 1.05 pounds
2 476 Gs
|
0.07 kg / 0.16 pounds
71 g / 0.7 N
|
0.43 kg / 0.94 pounds
~0 Gs
|
| 20 mm |
0.04 kg / 0.09 pounds
731 Gs
|
0.01 kg / 0.01 pounds
6 g / 0.1 N
|
0.04 kg / 0.08 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
94 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
60 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
29 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
21 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
16 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) - precautionary measures
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 |
| Mobile device | 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: Corrosion resistance
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 (Pc)
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. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*For standard magnets, 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.
Material specification
| 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 |
View also deals
Pros and cons of rare earth magnets.
Strengths
- They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
- They are extremely resistant to demagnetization induced by external magnetic fields,
- In other words, due to the smooth layer of gold, the element becomes visually attractive,
- Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of exact creating as well as modifying to complex needs,
- Versatile presence in high-tech industry – they are commonly used in hard drives, electromotive mechanisms, precision medical tools, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems
Limitations
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in producing nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Magnetic strength at its maximum – what it depends on?
- on a plate made of structural steel, perfectly concentrating the magnetic field
- with a cross-section minimum 10 mm
- with a plane free of scratches
- with direct contact (without coatings)
- under vertical force vector (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Distance – existence of any layer (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Safe handling of neodymium magnets
Combustion hazard
Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Choking Hazard
Always keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.
Caution required
Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.
Impact on smartphones
Note: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.
Eye protection
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.
Allergic reactions
It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for versions in plastic housing.
Pinching danger
Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!
Threat to electronics
Avoid bringing magnets near a purse, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.
Permanent damage
Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
ICD Warning
For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.
