MP 10x6x4 / N38 - ring magnet
ring magnet
Catalog no 030179
GTIN/EAN: 5906301811961
Diameter
10 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
1.51 g
Magnetization Direction
↑ axial
Load capacity
1.79 kg / 17.55 N
Magnetic Induction
386.91 mT / 3869 Gs
Coating
[NiCuNi] Nickel
0.898 ZŁ with VAT / pcs + price for transport
0.730 ZŁ net + 23% VAT / pcs
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Technical parameters of the product - MP 10x6x4 / N38 - ring magnet
Specification / characteristics - MP 10x6x4 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030179 |
| GTIN/EAN | 5906301811961 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 10 mm [±0,1 mm] |
| internal diameter Ø | 6 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 1.51 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.79 kg / 17.55 N |
| Magnetic Induction ~ ? | 386.91 mT / 3869 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
Presented information represent the direct effect of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - interaction chart
MP 10x6x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6115 Gs
611.5 mT
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
weak grip |
| 1 mm |
4915 Gs
491.5 mT
|
1.16 kg / 2.55 lbs
1156.7 g / 11.3 N
|
weak grip |
| 2 mm |
3833 Gs
383.3 mT
|
0.70 kg / 1.55 lbs
703.2 g / 6.9 N
|
weak grip |
| 3 mm |
2949 Gs
294.9 mT
|
0.42 kg / 0.92 lbs
416.3 g / 4.1 N
|
weak grip |
| 5 mm |
1761 Gs
176.1 mT
|
0.15 kg / 0.33 lbs
148.5 g / 1.5 N
|
weak grip |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 0.04 lbs
17.9 g / 0.2 N
|
weak grip |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 0.01 lbs
3.9 g / 0.0 N
|
weak grip |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 0.00 lbs
1.2 g / 0.0 N
|
weak grip |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
weak grip |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding force (wall)
MP 10x6x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.36 kg / 0.79 lbs
358.0 g / 3.5 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 lbs
232.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.31 lbs
140.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
30.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 10x6x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.54 kg / 1.18 lbs
537.0 g / 5.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.36 kg / 0.79 lbs
358.0 g / 3.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.18 kg / 0.39 lbs
179.0 g / 1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.90 kg / 1.97 lbs
895.0 g / 8.8 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x6x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.18 kg / 0.39 lbs
179.0 g / 1.8 N
|
| 1 mm |
|
0.45 kg / 0.99 lbs
447.5 g / 4.4 N
|
| 2 mm |
|
0.90 kg / 1.97 lbs
895.0 g / 8.8 N
|
| 3 mm |
|
1.34 kg / 2.96 lbs
1342.5 g / 13.2 N
|
| 5 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 10 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 11 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 12 mm |
|
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MP 10x6x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
OK |
| 40 °C | -2.2% |
1.75 kg / 3.86 lbs
1750.6 g / 17.2 N
|
OK |
| 60 °C | -4.4% |
1.71 kg / 3.77 lbs
1711.2 g / 16.8 N
|
OK |
| 80 °C | -6.6% |
1.67 kg / 3.69 lbs
1671.9 g / 16.4 N
|
|
| 100 °C | -28.8% |
1.27 kg / 2.81 lbs
1274.5 g / 12.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MP 10x6x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.93 kg / 28.50 lbs
6 169 Gs
|
1.94 kg / 4.27 lbs
1939 g / 19.0 N
|
N/A |
| 1 mm |
10.50 kg / 23.16 lbs
11 025 Gs
|
1.58 kg / 3.47 lbs
1576 g / 15.5 N
|
9.45 kg / 20.84 lbs
~0 Gs
|
| 2 mm |
8.35 kg / 18.41 lbs
9 831 Gs
|
1.25 kg / 2.76 lbs
1253 g / 12.3 N
|
7.52 kg / 16.57 lbs
~0 Gs
|
| 3 mm |
6.55 kg / 14.43 lbs
8 703 Gs
|
0.98 kg / 2.17 lbs
982 g / 9.6 N
|
5.89 kg / 12.99 lbs
~0 Gs
|
| 5 mm |
3.91 kg / 8.63 lbs
6 729 Gs
|
0.59 kg / 1.29 lbs
587 g / 5.8 N
|
3.52 kg / 7.76 lbs
~0 Gs
|
| 10 mm |
1.07 kg / 2.36 lbs
3 522 Gs
|
0.16 kg / 0.35 lbs
161 g / 1.6 N
|
0.96 kg / 2.13 lbs
~0 Gs
|
| 20 mm |
0.13 kg / 0.29 lbs
1 223 Gs
|
0.02 kg / 0.04 lbs
19 g / 0.2 N
|
0.12 kg / 0.26 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
194 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
129 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
91 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
66 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
50 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
39 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MP 10x6x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 9.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 7.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - warning
MP 10x6x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.94 km/h
(9.71 m/s)
|
0.07 J | |
| 30 mm |
60.15 km/h
(16.71 m/s)
|
0.21 J | |
| 50 mm |
77.64 km/h
(21.57 m/s)
|
0.35 J | |
| 100 mm |
109.80 km/h
(30.50 m/s)
|
0.70 J |
Table 9: Coating parameters (durability)
MP 10x6x4 / 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 10x6x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 017 Mx | 40.2 µWb |
| Pc Coefficient | 1.44 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MP 10x6x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.79 kg | Standard |
| Water (riverbed) |
2.05 kg
(+0.26 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros as well as cons of rare earth magnets.
Advantages
- They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
- Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
- A magnet with a shiny gold surface has better aesthetics,
- The surface of neodymium magnets generates a unique 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 modeling as well as modifying to concrete conditions,
- Key role in high-tech industry – they are used in data components, drive modules, advanced medical instruments, also complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
- Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Detachment force of the magnet in optimal conditions – what it depends on?
- using a plate made of low-carbon steel, acting as a ideal flux conductor
- possessing a thickness of at least 10 mm to ensure full flux closure
- characterized by smoothness
- with total lack of distance (no paint)
- under perpendicular force direction (90-degree angle)
- at ambient temperature room level
What influences lifting capacity in practice
- Distance – the presence of any layer (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
- Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Thermal conditions – NdFeB sinters 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).
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the holding force.
Safe handling of neodymium magnets
Keep away from electronics
Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.
Do not overheat magnets
Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.
Magnets are brittle
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them cracking into shards.
Immense force
Use magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and respect their force.
Swallowing risk
These products are not suitable for play. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.
Bodily injuries
Big blocks can smash fingers instantly. Under no circumstances place your hand between two attracting surfaces.
Fire risk
Powder produced during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Nickel coating and allergies
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.
Danger to pacemakers
Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.
Data carriers
Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
