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
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Physical properties - 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 |
Engineering analysis of the assembly - technical parameters
The following values constitute the result of a engineering simulation. Values are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Use these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
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 pounds
20710.0 g / 203.2 N
|
critical level |
| 1 mm |
5241 Gs
524.1 mT
|
18.01 kg / 39.71 pounds
18011.7 g / 176.7 N
|
critical level |
| 2 mm |
4861 Gs
486.1 mT
|
15.50 kg / 34.17 pounds
15498.1 g / 152.0 N
|
critical level |
| 3 mm |
4490 Gs
449.0 mT
|
13.22 kg / 29.15 pounds
13223.5 g / 129.7 N
|
critical level |
| 5 mm |
3792 Gs
379.2 mT
|
9.43 kg / 20.79 pounds
9429.0 g / 92.5 N
|
warning |
| 10 mm |
2404 Gs
240.4 mT
|
3.79 kg / 8.36 pounds
3791.3 g / 37.2 N
|
warning |
| 15 mm |
1526 Gs
152.6 mT
|
1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
|
low risk |
| 20 mm |
1000 Gs
100.0 mT
|
0.66 kg / 1.45 pounds
655.5 g / 6.4 N
|
low risk |
| 30 mm |
482 Gs
48.2 mT
|
0.15 kg / 0.34 pounds
152.6 g / 1.5 N
|
low risk |
| 50 mm |
161 Gs
16.1 mT
|
0.02 kg / 0.04 pounds
17.0 g / 0.2 N
|
low risk |
Table 2: Sliding force (vertical surface)
MP 30x6x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.14 kg / 9.13 pounds
4142.0 g / 40.6 N
|
| 1 mm | Stal (~0.2) |
3.60 kg / 7.94 pounds
3602.0 g / 35.3 N
|
| 2 mm | Stal (~0.2) |
3.10 kg / 6.83 pounds
3100.0 g / 30.4 N
|
| 3 mm | Stal (~0.2) |
2.64 kg / 5.83 pounds
2644.0 g / 25.9 N
|
| 5 mm | Stal (~0.2) |
1.89 kg / 4.16 pounds
1886.0 g / 18.5 N
|
| 10 mm | Stal (~0.2) |
0.76 kg / 1.67 pounds
758.0 g / 7.4 N
|
| 15 mm | Stal (~0.2) |
0.31 kg / 0.67 pounds
306.0 g / 3.0 N
|
| 20 mm | Stal (~0.2) |
0.13 kg / 0.29 pounds
132.0 g / 1.3 N
|
| 30 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
30.0 g / 0.3 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
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 pounds
6213.0 g / 60.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.14 kg / 9.13 pounds
4142.0 g / 40.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.07 kg / 4.57 pounds
2071.0 g / 20.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
10.36 kg / 22.83 pounds
10355.0 g / 101.6 N
|
Table 4: Steel thickness (saturation) - 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 pounds
1035.5 g / 10.2 N
|
| 1 mm |
|
2.59 kg / 5.71 pounds
2588.8 g / 25.4 N
|
| 2 mm |
|
5.18 kg / 11.41 pounds
5177.5 g / 50.8 N
|
| 3 mm |
|
7.77 kg / 17.12 pounds
7766.3 g / 76.2 N
|
| 5 mm |
|
12.94 kg / 28.54 pounds
12943.8 g / 127.0 N
|
| 10 mm |
|
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
|
| 11 mm |
|
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
|
| 12 mm |
|
20.71 kg / 45.66 pounds
20710.0 g / 203.2 N
|
Table 5: Thermal resistance (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 pounds
20710.0 g / 203.2 N
|
OK |
| 40 °C | -2.2% |
20.25 kg / 44.65 pounds
20254.4 g / 198.7 N
|
OK |
| 60 °C | -4.4% |
19.80 kg / 43.65 pounds
19798.8 g / 194.2 N
|
OK |
| 80 °C | -6.6% |
19.34 kg / 42.64 pounds
19343.1 g / 189.8 N
|
|
| 100 °C | -28.8% |
14.75 kg / 32.51 pounds
14745.5 g / 144.7 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 30x6x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
103.97 kg / 229.22 pounds
6 035 Gs
|
15.60 kg / 34.38 pounds
15596 g / 153.0 N
|
N/A |
| 1 mm |
97.15 kg / 214.17 pounds
10 864 Gs
|
14.57 kg / 32.13 pounds
14572 g / 143.0 N
|
87.43 kg / 192.75 pounds
~0 Gs
|
| 2 mm |
90.42 kg / 199.35 pounds
10 481 Gs
|
13.56 kg / 29.90 pounds
13564 g / 133.1 N
|
81.38 kg / 179.42 pounds
~0 Gs
|
| 3 mm |
83.97 kg / 185.13 pounds
10 100 Gs
|
12.60 kg / 27.77 pounds
12596 g / 123.6 N
|
75.57 kg / 166.61 pounds
~0 Gs
|
| 5 mm |
71.94 kg / 158.60 pounds
9 349 Gs
|
10.79 kg / 23.79 pounds
10791 g / 105.9 N
|
64.75 kg / 142.74 pounds
~0 Gs
|
| 10 mm |
47.34 kg / 104.36 pounds
7 583 Gs
|
7.10 kg / 15.65 pounds
7100 g / 69.7 N
|
42.60 kg / 93.92 pounds
~0 Gs
|
| 20 mm |
19.03 kg / 41.96 pounds
4 809 Gs
|
2.86 kg / 6.29 pounds
2855 g / 28.0 N
|
17.13 kg / 37.77 pounds
~0 Gs
|
| 50 mm |
1.53 kg / 3.37 pounds
1 363 Gs
|
0.23 kg / 0.51 pounds
229 g / 2.2 N
|
1.38 kg / 3.03 pounds
~0 Gs
|
| 60 mm |
0.77 kg / 1.69 pounds
965 Gs
|
0.11 kg / 0.25 pounds
115 g / 1.1 N
|
0.69 kg / 1.52 pounds
~0 Gs
|
| 70 mm |
0.41 kg / 0.90 pounds
706 Gs
|
0.06 kg / 0.14 pounds
61 g / 0.6 N
|
0.37 kg / 0.81 pounds
~0 Gs
|
| 80 mm |
0.23 kg / 0.51 pounds
531 Gs
|
0.03 kg / 0.08 pounds
35 g / 0.3 N
|
0.21 kg / 0.46 pounds
~0 Gs
|
| 90 mm |
0.14 kg / 0.30 pounds
409 Gs
|
0.02 kg / 0.05 pounds
21 g / 0.2 N
|
0.12 kg / 0.27 pounds
~0 Gs
|
| 100 mm |
0.09 kg / 0.19 pounds
322 Gs
|
0.01 kg / 0.03 pounds
13 g / 0.1 N
|
0.08 kg / 0.17 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
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 |
| Mobile device | 40 Gs (4.0 mT) | 9.0 cm |
| Remote | 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: Impact energy (cracking risk) - warning
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: Electrical data (Pc)
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. Vertical hold
*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.
3. Temperature resistance
*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) = 0.96
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 |
Other deals
Advantages as well as disadvantages of neodymium magnets.
Pros
- They do not lose magnetism, even after nearly 10 years – the reduction in strength is only ~1% (according to tests),
- They have excellent resistance to magnetic field loss due to external magnetic sources,
- In other words, due to the smooth finish of nickel, the element is aesthetically pleasing,
- Magnetic induction on the working layer of the magnet turns out to be exceptional,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of precise machining as well as modifying to defined needs,
- Fundamental importance in modern industrial fields – they find application in mass storage devices, drive modules, advanced medical instruments, as well as other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Cons
- At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Limited possibility of making nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical when they are in the body.
- Due to expensive raw materials, their price is relatively high,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- on a base made of mild steel, optimally conducting the magnetic field
- whose thickness equals approx. 10 mm
- with an polished touching surface
- with total lack of distance (no coatings)
- during detachment in a direction perpendicular to the plane
- at room temperature
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
This is not a toy
Adult use only. Tiny parts pose a choking risk, causing severe trauma. Keep out of reach of kids and pets.
Conscious usage
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Electronic devices
Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Eye protection
Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.
Combustion hazard
Machining of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Keep away from electronics
Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
ICD Warning
Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.
Heat sensitivity
Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.
Allergy Warning
Some people experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in dermatitis. It is best to use safety gloves.
Hand protection
Large magnets can smash fingers in a fraction of a second. Do not place your hand between two strong magnets.
