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
bulk discounts:
Need more?
Pick up the phone and ask
+48 888 99 98 98
otherwise drop us a message through
our online form
through our site.
Strength as well as shape of neodymium magnets can be analyzed with our
modular calculator.
Orders placed before 14:00 will be shipped the same business day.
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 |
Technical modeling of the assembly - technical parameters
The following information are the result of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these calculations as a reference point for designers.
Table 1: Static 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 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
|
medium risk |
| 10 mm |
2404 Gs
240.4 mT
|
3.79 kg / 8.36 LBS
3791.3 g / 37.2 N
|
medium risk |
| 15 mm |
1526 Gs
152.6 mT
|
1.53 kg / 3.37 LBS
1527.0 g / 15.0 N
|
low risk |
| 20 mm |
1000 Gs
100.0 mT
|
0.66 kg / 1.45 LBS
655.5 g / 6.4 N
|
low risk |
| 30 mm |
482 Gs
48.2 mT
|
0.15 kg / 0.34 LBS
152.6 g / 1.5 N
|
low risk |
| 50 mm |
161 Gs
16.1 mT
|
0.02 kg / 0.04 LBS
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 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: Wall mounting (sliding) - 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 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: Steel thickness (substrate influence) - power losses
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 (repulsion) - forces in the system
MP 30x6x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Hazards (implants) - 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 |
| Mechanical watch | 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) - 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: Surface protection spec
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. Vertical hold
*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Thermal stability
*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.
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 |
See also products
Advantages and disadvantages of neodymium magnets.
Pros
- They retain full power for almost 10 years – the loss is just ~1% (in theory),
- They feature excellent resistance to magnetic field loss when exposed to external magnetic sources,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to look better,
- The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of accurate shaping as well as adjusting to individual requirements,
- Universal use in innovative solutions – they are used in data components, electric motors, diagnostic systems, and modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in power. 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We recommend casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex forms.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price is higher than average,
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- on a plate made of structural steel, perfectly concentrating the magnetic flux
- with a thickness no less than 10 mm
- with a surface free of scratches
- with direct contact (without impurities)
- for force acting at a right angle (in the magnet axis)
- in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, 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 – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.
H&S for magnets
Danger to the youngest
Neodymium magnets are not intended for children. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.
Warning for allergy sufferers
Certain individuals experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to skin redness. We recommend wear protective gloves.
Fire warning
Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
Demagnetization risk
Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).
Protect data
Data protection: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Magnets are brittle
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Phone sensors
Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.
Immense force
Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Life threat
Warning for patients: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.
Bone fractures
Big blocks can break fingers instantly. Do not put your hand betwixt two strong magnets.
