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
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Technical details - 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 |
Technical analysis of the magnet - technical parameters
These information are the outcome of a engineering calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.
Table 1: Static 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 pounds
20710.0 g / 203.2 N
|
crushing |
| 1 mm |
5241 Gs
524.1 mT
|
18.01 kg / 39.71 pounds
18011.7 g / 176.7 N
|
crushing |
| 2 mm |
4861 Gs
486.1 mT
|
15.50 kg / 34.17 pounds
15498.1 g / 152.0 N
|
crushing |
| 3 mm |
4490 Gs
449.0 mT
|
13.22 kg / 29.15 pounds
13223.5 g / 129.7 N
|
crushing |
| 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: Vertical 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: 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 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: Material efficiency (saturation) - power losses
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) - resistance threshold
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) - forces in the system
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: Hazards (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 |
| Phone / Smartphone | 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: Collisions (kinetic energy) - 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 (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: Submerged application
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. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds only a fraction of its max power.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For N38 material, the max working temp 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.
Material specification
| 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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Pros and cons of neodymium magnets.
Benefits
- Their strength remains stable, and after around 10 years it drops only by ~1% (theoretically),
- They have excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Due to the possibility of flexible forming and customization to custom requirements, NdFeB magnets can be modeled in a wide range of forms and dimensions, which amplifies use scope,
- Key role in modern technologies – they find application in data components, brushless drives, diagnostic systems, and technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Cons
- At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their strength 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
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of making threads in the magnet and complex shapes - recommended is cover - magnetic holder.
- Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can disrupt the diagnostic process medical in case of swallowing.
- Due to complex production process, their price is higher than average,
Pull force analysis
Maximum lifting force for a neodymium magnet – what it depends on?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- whose transverse dimension is min. 10 mm
- with an polished contact surface
- under conditions of ideal adhesion (metal-to-metal)
- during pulling in a direction vertical to the plane
- in stable room temperature
Magnet lifting force in use – key factors
- Distance (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
- Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity was determined using 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. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Dust is flammable
Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Swallowing risk
NdFeB magnets are not toys. Eating multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.
Metal Allergy
Certain individuals suffer from a sensitization to nickel, which is the common plating for neodymium magnets. Extended handling may cause dermatitis. We strongly advise wear protective gloves.
Material brittleness
Neodymium magnets are sintered ceramics, which means they are very brittle. Collision of two magnets will cause them shattering into small pieces.
Threat to navigation
Be aware: rare earth magnets produce a field that disrupts precision electronics. Keep a separation from your mobile, tablet, and GPS.
ICD Warning
Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Maximum temperature
Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).
Finger safety
Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!
Handling rules
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Magnetic media
Very strong magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
