MP 20x8x6 / N38 - ring magnet
ring magnet
Catalog no 030189
GTIN/EAN: 5906301812067
Diameter
20 mm [±0,1 mm]
internal diameter Ø
8 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
11.88 g
Magnetization Direction
↑ axial
Load capacity
7.22 kg / 70.81 N
Magnetic Induction
318.85 mT / 3188 Gs
Coating
[NiCuNi] Nickel
5.17 ZŁ with VAT / pcs + price for transport
4.20 ZŁ net + 23% VAT / pcs
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Technical parameters - MP 20x8x6 / N38 - ring magnet
Specification / characteristics - MP 20x8x6 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030189 |
| GTIN/EAN | 5906301812067 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 20 mm [±0,1 mm] |
| internal diameter Ø | 8 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 11.88 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 7.22 kg / 70.81 N |
| Magnetic Induction ~ ? | 318.85 mT / 3188 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 simulation of the product - report
Presented values constitute the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Actual parameters may deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs distance) - power drop
MP 20x8x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5917 Gs
591.7 mT
|
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
warning |
| 1 mm |
5321 Gs
532.1 mT
|
5.84 kg / 12.87 pounds
5839.8 g / 57.3 N
|
warning |
| 2 mm |
4736 Gs
473.6 mT
|
4.63 kg / 10.20 pounds
4626.6 g / 45.4 N
|
warning |
| 3 mm |
4184 Gs
418.4 mT
|
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
|
warning |
| 5 mm |
3216 Gs
321.6 mT
|
2.13 kg / 4.70 pounds
2132.9 g / 20.9 N
|
warning |
| 10 mm |
1650 Gs
165.0 mT
|
0.56 kg / 1.24 pounds
561.3 g / 5.5 N
|
low risk |
| 15 mm |
907 Gs
90.7 mT
|
0.17 kg / 0.37 pounds
169.7 g / 1.7 N
|
low risk |
| 20 mm |
544 Gs
54.4 mT
|
0.06 kg / 0.13 pounds
61.1 g / 0.6 N
|
low risk |
| 30 mm |
240 Gs
24.0 mT
|
0.01 kg / 0.03 pounds
11.9 g / 0.1 N
|
low risk |
| 50 mm |
75 Gs
7.5 mT
|
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
|
low risk |
Table 2: Slippage load (vertical surface)
MP 20x8x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.44 kg / 3.18 pounds
1444.0 g / 14.2 N
|
| 1 mm | Stal (~0.2) |
1.17 kg / 2.57 pounds
1168.0 g / 11.5 N
|
| 2 mm | Stal (~0.2) |
0.93 kg / 2.04 pounds
926.0 g / 9.1 N
|
| 3 mm | Stal (~0.2) |
0.72 kg / 1.59 pounds
722.0 g / 7.1 N
|
| 5 mm | Stal (~0.2) |
0.43 kg / 0.94 pounds
426.0 g / 4.2 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.25 pounds
112.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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) - behavior on slippery surfaces
MP 20x8x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.17 kg / 4.78 pounds
2166.0 g / 21.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.44 kg / 3.18 pounds
1444.0 g / 14.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.72 kg / 1.59 pounds
722.0 g / 7.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
|
Table 4: Material efficiency (saturation) - power losses
MP 20x8x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.72 kg / 1.59 pounds
722.0 g / 7.1 N
|
| 1 mm |
|
1.81 kg / 3.98 pounds
1805.0 g / 17.7 N
|
| 2 mm |
|
3.61 kg / 7.96 pounds
3610.0 g / 35.4 N
|
| 3 mm |
|
5.42 kg / 11.94 pounds
5415.0 g / 53.1 N
|
| 5 mm |
|
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
| 10 mm |
|
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
| 11 mm |
|
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
| 12 mm |
|
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
Table 5: Working in heat (material behavior) - thermal limit
MP 20x8x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.22 kg / 15.92 pounds
7220.0 g / 70.8 N
|
OK |
| 40 °C | -2.2% |
7.06 kg / 15.57 pounds
7061.2 g / 69.3 N
|
OK |
| 60 °C | -4.4% |
6.90 kg / 15.22 pounds
6902.3 g / 67.7 N
|
OK |
| 80 °C | -6.6% |
6.74 kg / 14.87 pounds
6743.5 g / 66.2 N
|
|
| 100 °C | -28.8% |
5.14 kg / 11.33 pounds
5140.6 g / 50.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 20x8x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
52.44 kg / 115.62 pounds
6 121 Gs
|
7.87 kg / 17.34 pounds
7867 g / 77.2 N
|
N/A |
| 1 mm |
47.33 kg / 104.35 pounds
11 242 Gs
|
7.10 kg / 15.65 pounds
7100 g / 69.6 N
|
42.60 kg / 93.91 pounds
~0 Gs
|
| 2 mm |
42.42 kg / 93.52 pounds
10 642 Gs
|
6.36 kg / 14.03 pounds
6363 g / 62.4 N
|
38.18 kg / 84.16 pounds
~0 Gs
|
| 3 mm |
37.84 kg / 83.42 pounds
10 051 Gs
|
5.68 kg / 12.51 pounds
5675 g / 55.7 N
|
34.05 kg / 75.07 pounds
~0 Gs
|
| 5 mm |
29.73 kg / 65.55 pounds
8 910 Gs
|
4.46 kg / 9.83 pounds
4460 g / 43.8 N
|
26.76 kg / 59.00 pounds
~0 Gs
|
| 10 mm |
15.49 kg / 34.16 pounds
6 432 Gs
|
2.32 kg / 5.12 pounds
2324 g / 22.8 N
|
13.94 kg / 30.74 pounds
~0 Gs
|
| 20 mm |
4.08 kg / 8.99 pounds
3 299 Gs
|
0.61 kg / 1.35 pounds
612 g / 6.0 N
|
3.67 kg / 8.09 pounds
~0 Gs
|
| 50 mm |
0.18 kg / 0.41 pounds
702 Gs
|
0.03 kg / 0.06 pounds
28 g / 0.3 N
|
0.17 kg / 0.37 pounds
~0 Gs
|
| 60 mm |
0.09 kg / 0.19 pounds
480 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
| 70 mm |
0.04 kg / 0.10 pounds
342 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 80 mm |
0.02 kg / 0.05 pounds
253 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 90 mm |
0.01 kg / 0.03 pounds
193 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 100 mm |
0.01 kg / 0.02 pounds
150 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 9.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MP 20x8x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
26.04 km/h
(7.23 m/s)
|
0.31 J | |
| 30 mm |
43.11 km/h
(11.97 m/s)
|
0.85 J | |
| 50 mm |
55.60 km/h
(15.44 m/s)
|
1.42 J | |
| 100 mm |
78.62 km/h
(21.84 m/s)
|
2.83 J |
Table 9: Surface protection spec
MP 20x8x6 / 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)
MP 20x8x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 15 688 Mx | 156.9 µWb |
| Pc Coefficient | 1.14 | High (Stable) |
Table 11: Submerged application
MP 20x8x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 7.22 kg | Standard |
| Water (riverbed) |
8.27 kg
(+1.05 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.14
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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Advantages and disadvantages of neodymium magnets.
Benefits
- They do not lose strength, even during approximately 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
- They are noted for resistance to demagnetization induced by external magnetic fields,
- In other words, due to the glossy layer of nickel, the element gains a professional look,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- In view of the potential of free molding and adaptation to specialized projects, magnetic components can be created in a wide range of geometric configurations, which amplifies use scope,
- Versatile presence in high-tech industry – they serve a role in data components, motor assemblies, medical devices, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
- 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, when using outdoors
- Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
- Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- using a sheet made of mild steel, acting as a circuit closing element
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with an polished touching surface
- under conditions of gap-free contact (metal-to-metal)
- for force applied at a right angle (pull-off, not shear)
- at room temperature
Key elements affecting lifting force
- Gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
- Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be wasted to the other side.
- Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
- Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.
Warnings
Respect the power
Use magnets consciously. Their immense force can shock even professionals. Plan your moves and do not underestimate their force.
Maximum temperature
Control the heat. Exposing the magnet to high heat will permanently weaken its properties and pulling force.
Precision electronics
Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Data carriers
Do not bring magnets near a wallet, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Flammability
Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Nickel coating and allergies
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease handling magnets and use protective gear.
Risk of cracking
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.
Implant safety
Individuals with a heart stimulator must keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.
Finger safety
Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
Swallowing risk
NdFeB magnets are not toys. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.
