MP 30x6x10 / N38 - ring magnet
ring magnet
Catalog no 030197
GTIN/EAN: 5906301812142
Diameter
30 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
50.89 g
Magnetization Direction
↑ axial
Load capacity
20.71 kg / 203.16 N
Magnetic Induction
343.81 mT / 3438 Gs
Coating
[NiCuNi] Nickel
16.00 ZŁ with VAT / pcs + price for transport
13.01 ZŁ net + 23% VAT / pcs
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Product card - MP 30x6x10 / N38 - ring magnet
Specification / characteristics - MP 30x6x10 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030197 |
| GTIN/EAN | 5906301812142 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 30 mm [±0,1 mm] |
| internal diameter Ø | 6 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 50.89 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 20.71 kg / 203.16 N |
| Magnetic Induction ~ ? | 343.81 mT / 3438 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 modeling of the assembly - report
The following values constitute the result of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs gap) - characteristics
MP 30x6x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5619 Gs
561.9 mT
|
20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
|
critical level |
| 1 mm |
5241 Gs
524.1 mT
|
18.01 kg / 39.71 LBS
18011.7 g / 176.7 N
|
critical level |
| 2 mm |
4861 Gs
486.1 mT
|
15.50 kg / 34.17 LBS
15498.1 g / 152.0 N
|
critical level |
| 3 mm |
4490 Gs
449.0 mT
|
13.22 kg / 29.15 LBS
13223.5 g / 129.7 N
|
critical level |
| 5 mm |
3792 Gs
379.2 mT
|
9.43 kg / 20.79 LBS
9429.0 g / 92.5 N
|
strong |
| 10 mm |
2404 Gs
240.4 mT
|
3.79 kg / 8.36 LBS
3791.3 g / 37.2 N
|
strong |
| 15 mm |
1526 Gs
152.6 mT
|
1.53 kg / 3.37 LBS
1527.0 g / 15.0 N
|
weak grip |
| 20 mm |
1000 Gs
100.0 mT
|
0.66 kg / 1.45 LBS
655.5 g / 6.4 N
|
weak grip |
| 30 mm |
482 Gs
48.2 mT
|
0.15 kg / 0.34 LBS
152.6 g / 1.5 N
|
weak grip |
| 50 mm |
161 Gs
16.1 mT
|
0.02 kg / 0.04 LBS
17.0 g / 0.2 N
|
weak grip |
Table 2: Vertical hold (wall)
MP 30x6x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.14 kg / 9.13 LBS
4142.0 g / 40.6 N
|
| 1 mm | Stal (~0.2) |
3.60 kg / 7.94 LBS
3602.0 g / 35.3 N
|
| 2 mm | Stal (~0.2) |
3.10 kg / 6.83 LBS
3100.0 g / 30.4 N
|
| 3 mm | Stal (~0.2) |
2.64 kg / 5.83 LBS
2644.0 g / 25.9 N
|
| 5 mm | Stal (~0.2) |
1.89 kg / 4.16 LBS
1886.0 g / 18.5 N
|
| 10 mm | Stal (~0.2) |
0.76 kg / 1.67 LBS
758.0 g / 7.4 N
|
| 15 mm | Stal (~0.2) |
0.31 kg / 0.67 LBS
306.0 g / 3.0 N
|
| 20 mm | Stal (~0.2) |
0.13 kg / 0.29 LBS
132.0 g / 1.3 N
|
| 30 mm | Stal (~0.2) |
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 30x6x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
6.21 kg / 13.70 LBS
6213.0 g / 60.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.14 kg / 9.13 LBS
4142.0 g / 40.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.07 kg / 4.57 LBS
2071.0 g / 20.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.36 kg / 22.83 LBS
10355.0 g / 101.6 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 30x6x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.04 kg / 2.28 LBS
1035.5 g / 10.2 N
|
| 1 mm |
|
2.59 kg / 5.71 LBS
2588.8 g / 25.4 N
|
| 2 mm |
|
5.18 kg / 11.41 LBS
5177.5 g / 50.8 N
|
| 3 mm |
|
7.77 kg / 17.12 LBS
7766.3 g / 76.2 N
|
| 5 mm |
|
12.94 kg / 28.54 LBS
12943.8 g / 127.0 N
|
| 10 mm |
|
20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
|
| 11 mm |
|
20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
|
| 12 mm |
|
20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
|
Table 5: Working in heat (stability) - thermal limit
MP 30x6x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
20.71 kg / 45.66 LBS
20710.0 g / 203.2 N
|
OK |
| 40 °C | -2.2% |
20.25 kg / 44.65 LBS
20254.4 g / 198.7 N
|
OK |
| 60 °C | -4.4% |
19.80 kg / 43.65 LBS
19798.8 g / 194.2 N
|
OK |
| 80 °C | -6.6% |
19.34 kg / 42.64 LBS
19343.1 g / 189.8 N
|
|
| 100 °C | -28.8% |
14.75 kg / 32.51 LBS
14745.5 g / 144.7 N
|
Table 6: Two magnets (attraction) - forces in the system
MP 30x6x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
103.97 kg / 229.22 LBS
6 035 Gs
|
15.60 kg / 34.38 LBS
15596 g / 153.0 N
|
N/A |
| 1 mm |
97.15 kg / 214.17 LBS
10 864 Gs
|
14.57 kg / 32.13 LBS
14572 g / 143.0 N
|
87.43 kg / 192.75 LBS
~0 Gs
|
| 2 mm |
90.42 kg / 199.35 LBS
10 481 Gs
|
13.56 kg / 29.90 LBS
13564 g / 133.1 N
|
81.38 kg / 179.42 LBS
~0 Gs
|
| 3 mm |
83.97 kg / 185.13 LBS
10 100 Gs
|
12.60 kg / 27.77 LBS
12596 g / 123.6 N
|
75.57 kg / 166.61 LBS
~0 Gs
|
| 5 mm |
71.94 kg / 158.60 LBS
9 349 Gs
|
10.79 kg / 23.79 LBS
10791 g / 105.9 N
|
64.75 kg / 142.74 LBS
~0 Gs
|
| 10 mm |
47.34 kg / 104.36 LBS
7 583 Gs
|
7.10 kg / 15.65 LBS
7100 g / 69.7 N
|
42.60 kg / 93.92 LBS
~0 Gs
|
| 20 mm |
19.03 kg / 41.96 LBS
4 809 Gs
|
2.86 kg / 6.29 LBS
2855 g / 28.0 N
|
17.13 kg / 37.77 LBS
~0 Gs
|
| 50 mm |
1.53 kg / 3.37 LBS
1 363 Gs
|
0.23 kg / 0.51 LBS
229 g / 2.2 N
|
1.38 kg / 3.03 LBS
~0 Gs
|
| 60 mm |
0.77 kg / 1.69 LBS
965 Gs
|
0.11 kg / 0.25 LBS
115 g / 1.1 N
|
0.69 kg / 1.52 LBS
~0 Gs
|
| 70 mm |
0.41 kg / 0.90 LBS
706 Gs
|
0.06 kg / 0.14 LBS
61 g / 0.6 N
|
0.37 kg / 0.81 LBS
~0 Gs
|
| 80 mm |
0.23 kg / 0.51 LBS
531 Gs
|
0.03 kg / 0.08 LBS
35 g / 0.3 N
|
0.21 kg / 0.46 LBS
~0 Gs
|
| 90 mm |
0.14 kg / 0.30 LBS
409 Gs
|
0.02 kg / 0.05 LBS
21 g / 0.2 N
|
0.12 kg / 0.27 LBS
~0 Gs
|
| 100 mm |
0.09 kg / 0.19 LBS
322 Gs
|
0.01 kg / 0.03 LBS
13 g / 0.1 N
|
0.08 kg / 0.17 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MP 30x6x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 19.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 15.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 12.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.0 cm |
| Car key | 50 Gs (5.0 mT) | 8.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Collisions (kinetic energy) - collision effects
MP 30x6x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.55 km/h
(6.26 m/s)
|
1.00 J | |
| 30 mm |
35.40 km/h
(9.83 m/s)
|
2.46 J | |
| 50 mm |
45.52 km/h
(12.64 m/s)
|
4.07 J | |
| 100 mm |
64.34 km/h
(17.87 m/s)
|
8.13 J |
Table 9: Coating parameters (durability)
MP 30x6x10 / 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 30x6x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 31 585 Mx | 315.8 µWb |
| Pc Coefficient | 0.96 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MP 30x6x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 20.71 kg | Standard |
| Water (riverbed) |
23.71 kg
(+3.00 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet holds just a fraction of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.96
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 |
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Advantages as well as disadvantages of neodymium magnets.
Benefits
- They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- Neodymium magnets are exceptionally resistant to demagnetization caused by magnetic disturbances,
- In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
- Magnets have impressive magnetic induction on the outer side,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
- In view of the possibility of precise shaping and adaptation to individualized solutions, magnetic components can be modeled in a variety of shapes and sizes, which amplifies use scope,
- Significant place in high-tech industry – they are commonly used in computer drives, brushless drives, precision medical tools, also modern systems.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We suggest casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
- Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is a challenge,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- on a block made of mild steel, effectively closing the magnetic flux
- whose transverse dimension is min. 10 mm
- with a surface perfectly flat
- without the slightest air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at temperature room level
Practical aspects of lifting capacity – factors
- Gap 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.
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
- Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
- Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.
Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Safety rules for work with neodymium magnets
Dust is flammable
Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Crushing force
Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Magnetic media
Powerful magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Health Danger
People with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.
Allergic reactions
Some people have a hypersensitivity to nickel, which is the common plating for neodymium magnets. Extended handling might lead to a rash. We suggest use safety gloves.
This is not a toy
Only for adults. Small elements can be swallowed, leading to severe trauma. Store out of reach of children and animals.
Protective goggles
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Threat to navigation
Note: rare earth magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.
Caution required
Exercise caution. Rare earth magnets act from a distance and connect with massive power, often faster than you can move away.
Do not overheat magnets
Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).
