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
Load capacity
1.47 kg / 14.45 N
Magnetic Induction
598.12 mT / 5981 Gs
Coating
[NiCuNi] Nickel
3.44 ZŁ with VAT / pcs + price for transport
2.80 ZŁ net + 23% VAT / pcs
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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 |
Physical simulation of the magnet - technical parameters
These values constitute the result of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational performance might slightly differ. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull 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 LBS
1470.0 g / 14.4 N
|
low risk |
| 1 mm |
4511 Gs
451.1 mT
|
0.84 kg / 1.85 LBS
837.8 g / 8.2 N
|
low risk |
| 2 mm |
3262 Gs
326.2 mT
|
0.44 kg / 0.97 LBS
438.2 g / 4.3 N
|
low risk |
| 3 mm |
2332 Gs
233.2 mT
|
0.22 kg / 0.49 LBS
224.0 g / 2.2 N
|
low risk |
| 5 mm |
1238 Gs
123.8 mT
|
0.06 kg / 0.14 LBS
63.1 g / 0.6 N
|
low risk |
| 10 mm |
366 Gs
36.6 mT
|
0.01 kg / 0.01 LBS
5.5 g / 0.1 N
|
low risk |
| 15 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
|
low risk |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
low risk |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
8 Gs
0.8 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Shear 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: Vertical assembly (sliding) - behavior on slippery surfaces
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: Steel thickness (saturation) - sheet metal selection
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) - 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 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 (attraction) - forces in the system
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 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: Hazards (electronics) - 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Remote | 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: Collisions (cracking risk) - collision effects
MW 8x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.31 km/h
(4.53 m/s)
|
0.06 J | |
| 30 mm |
28.18 km/h
(7.83 m/s)
|
0.17 J | |
| 50 mm |
36.37 km/h
(10.10 m/s)
|
0.29 J | |
| 100 mm |
51.44 km/h
(14.29 m/s)
|
0.58 J |
Table 9: Coating parameters (durability)
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: Electrical 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: Underwater work (magnet fishing)
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
*Note: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.19
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 neodymium magnets.
Pros
- They retain attractive force for almost 10 years – the loss is just ~1% (in theory),
- Neodymium magnets prove to be remarkably resistant to demagnetization caused by external field sources,
- In other words, due to the metallic surface of gold, the element gains visual value,
- Magnets exhibit very high magnetic induction on the outer side,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Thanks to modularity in forming and the capacity to customize to unusual requirements,
- Fundamental importance in future technologies – they serve a role in computer drives, drive modules, diagnostic systems, also complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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
- Limited ability of producing nuts in the magnet and complicated shapes - recommended is casing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- using a sheet made of low-carbon steel, serving as a ideal flux conductor
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by smoothness
- with direct contact (no paint)
- for force acting at a right angle (pull-off, not shear)
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Clearance – the presence of any layer (rust, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
- Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.
Precautions when working with NdFeB magnets
Hand protection
Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
ICD Warning
Patients with a pacemaker must keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Electronic devices
Data protection: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).
Product not for children
Strictly store magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.
GPS and phone interference
Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your mobile, device, and GPS.
Permanent damage
Control the heat. Heating the magnet to high heat will ruin its magnetic structure and pulling force.
Skin irritation risks
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid direct skin contact and choose coated magnets.
Fire risk
Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Caution required
Handle with care. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can move away.
Material brittleness
Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
