MW 8x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010101
GTIN/EAN: 5906301811008
Diameter Ø
8 mm [±0,1 mm]
Height
1.5 mm [±0,1 mm]
Weight
0.57 g
Magnetization Direction
↑ axial
Load capacity
0.74 kg / 7.27 N
Magnetic Induction
217.52 mT / 2175 Gs
Coating
[NiCuNi] Nickel
0.455 ZŁ with VAT / pcs + price for transport
0.370 ZŁ net + 23% VAT / pcs
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Physical properties - MW 8x1.5 / N38 - cylindrical magnet
Specification / characteristics - MW 8x1.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010101 |
| GTIN/EAN | 5906301811008 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 1.5 mm [±0,1 mm] |
| Weight | 0.57 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.74 kg / 7.27 N |
| Magnetic Induction ~ ? | 217.52 mT / 2175 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 product - technical parameters
These data are the result of a mathematical simulation. Values are based on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a reference point when designing systems.
Table 1: Static force (force vs distance) - interaction chart
MW 8x1.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2174 Gs
217.4 mT
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
weak grip |
| 1 mm |
1782 Gs
178.2 mT
|
0.50 kg / 1.10 pounds
497.3 g / 4.9 N
|
weak grip |
| 2 mm |
1310 Gs
131.0 mT
|
0.27 kg / 0.59 pounds
268.7 g / 2.6 N
|
weak grip |
| 3 mm |
914 Gs
91.4 mT
|
0.13 kg / 0.29 pounds
130.8 g / 1.3 N
|
weak grip |
| 5 mm |
439 Gs
43.9 mT
|
0.03 kg / 0.07 pounds
30.2 g / 0.3 N
|
weak grip |
| 10 mm |
99 Gs
9.9 mT
|
0.00 kg / 0.00 pounds
1.5 g / 0.0 N
|
weak grip |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
weak grip |
| 20 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical capacity (vertical surface)
MW 8x1.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.33 pounds
148.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
100.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.12 pounds
54.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.03 kg / 0.06 pounds
26.0 g / 0.3 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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: Wall mounting (sliding) - vertical pull
MW 8x1.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.22 kg / 0.49 pounds
222.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 pounds
148.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.16 pounds
74.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.37 kg / 0.82 pounds
370.0 g / 3.6 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x1.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.16 pounds
74.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 pounds
185.0 g / 1.8 N
|
| 2 mm |
|
0.37 kg / 0.82 pounds
370.0 g / 3.6 N
|
| 3 mm |
|
0.55 kg / 1.22 pounds
555.0 g / 5.4 N
|
| 5 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 10 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 11 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
| 12 mm |
|
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
Table 5: Thermal stability (material behavior) - power drop
MW 8x1.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.74 kg / 1.63 pounds
740.0 g / 7.3 N
|
OK |
| 40 °C | -2.2% |
0.72 kg / 1.60 pounds
723.7 g / 7.1 N
|
OK |
| 60 °C | -4.4% |
0.71 kg / 1.56 pounds
707.4 g / 6.9 N
|
|
| 80 °C | -6.6% |
0.69 kg / 1.52 pounds
691.2 g / 6.8 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.16 pounds
526.9 g / 5.2 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 8x1.5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.46 kg / 3.23 pounds
3 712 Gs
|
0.22 kg / 0.48 pounds
220 g / 2.2 N
|
N/A |
| 1 mm |
1.24 kg / 2.74 pounds
4 007 Gs
|
0.19 kg / 0.41 pounds
187 g / 1.8 N
|
1.12 kg / 2.47 pounds
~0 Gs
|
| 2 mm |
0.98 kg / 2.17 pounds
3 565 Gs
|
0.15 kg / 0.33 pounds
148 g / 1.4 N
|
0.89 kg / 1.95 pounds
~0 Gs
|
| 3 mm |
0.74 kg / 1.63 pounds
3 086 Gs
|
0.11 kg / 0.24 pounds
111 g / 1.1 N
|
0.66 kg / 1.46 pounds
~0 Gs
|
| 5 mm |
0.37 kg / 0.82 pounds
2 196 Gs
|
0.06 kg / 0.12 pounds
56 g / 0.5 N
|
0.34 kg / 0.74 pounds
~0 Gs
|
| 10 mm |
0.06 kg / 0.13 pounds
878 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.05 kg / 0.12 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
199 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
17 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
10 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
6 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
4 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
3 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
2 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 8x1.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (cracking risk) - warning
MW 8x1.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
36.39 km/h
(10.11 m/s)
|
0.03 J | |
| 30 mm |
62.94 km/h
(17.48 m/s)
|
0.09 J | |
| 50 mm |
81.25 km/h
(22.57 m/s)
|
0.15 J | |
| 100 mm |
114.91 km/h
(31.92 m/s)
|
0.29 J |
Table 9: Surface protection spec
MW 8x1.5 / 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 8x1.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 285 Mx | 12.9 µWb |
| Pc Coefficient | 0.27 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 8x1.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.74 kg | Standard |
| Water (riverbed) |
0.85 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains only ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.27
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 |
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Strengths as well as weaknesses of rare earth magnets.
Advantages
- They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
- Neodymium magnets prove to be extremely resistant to magnetic field loss caused by magnetic disturbances,
- The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnets possess maximum magnetic induction on the outer side,
- 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...
- In view of the possibility of free molding and customization to specialized solutions, NdFeB magnets can be produced in a broad palette of geometric configurations, which makes them more universal,
- Huge importance in modern industrial fields – they find application in hard drives, electric motors, precision medical tools, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices
Limitations
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
- We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
- Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Best holding force of the magnet in ideal parameters – what affects it?
- on a plate made of mild steel, effectively closing the magnetic flux
- whose thickness is min. 10 mm
- characterized by even structure
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Lifting capacity in real conditions – factors
- Air gap (between the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with neodymium magnets
Implant safety
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Adults only
These products are not intended for children. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which poses a severe health hazard and requires immediate surgery.
Threat to electronics
Equipment safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Caution required
Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their force.
Pinching danger
Protect your hands. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!
Dust is flammable
Mechanical processing of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Impact on smartphones
Navigation devices and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Sensitization to coating
Certain individuals have a sensitization to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause an allergic reaction. It is best to use protective gloves.
Thermal limits
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Fragile material
Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
