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:
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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 modeling of the product - data
These information are the result of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Actual performance may differ. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs gap) - 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
|
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
|
strong |
| 10 mm |
2404 Gs
240.4 mT
|
3.79 kg / 8.36 pounds
3791.3 g / 37.2 N
|
strong |
| 15 mm |
1526 Gs
152.6 mT
|
1.53 kg / 3.37 pounds
1527.0 g / 15.0 N
|
weak grip |
| 20 mm |
1000 Gs
100.0 mT
|
0.66 kg / 1.45 pounds
655.5 g / 6.4 N
|
weak grip |
| 30 mm |
482 Gs
48.2 mT
|
0.15 kg / 0.34 pounds
152.6 g / 1.5 N
|
weak grip |
| 50 mm |
161 Gs
16.1 mT
|
0.02 kg / 0.04 pounds
17.0 g / 0.2 N
|
weak grip |
Table 2: Shear capacity (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) - 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: 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 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: Two magnets (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: 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 |
| 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: Dynamics (cracking risk) - 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: 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: 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: Underwater work (magnet fishing)
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. Shear force
*Warning: On a vertical wall, the magnet retains merely ~20% of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) drastically limits 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
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% |
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 rare earth magnets.
Advantages
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
- They show high resistance to demagnetization induced by external magnetic fields,
- Thanks to the smooth finish, the layer of nickel, gold-plated, or silver-plated gives an visually attractive appearance,
- Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to the option of flexible forming and customization to specialized projects, magnetic components can be created in a broad palette of shapes and sizes, which makes them more universal,
- Huge importance in innovative solutions – they are utilized in hard drives, brushless drives, diagnostic systems, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Magnetic strength at its maximum – what affects it?
- with the application of a sheet made of special test steel, ensuring maximum field concentration
- possessing a thickness of minimum 10 mm to ensure full flux closure
- with a plane perfectly flat
- with direct contact (without impurities)
- under perpendicular application of breakaway force (90-degree angle)
- in temp. approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
- Plate thickness – too thin plate does not close the flux, causing part of the power to be wasted to the other side.
- Metal type – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
- Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Warnings
Risk of cracking
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
Adults only
Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of children and animals.
GPS Danger
GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.
Safe distance
Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).
Avoid contact if allergic
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.
Flammability
Powder produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Bone fractures
Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.
Immense force
Exercise caution. Neodymium magnets act from a long distance and connect with massive power, often faster than you can move away.
Medical interference
For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.
Maximum temperature
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
