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 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 product - technical parameters
The following information constitute the outcome of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Operational parameters may differ. Treat these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - characteristics
MP 10x6x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
6115 Gs
611.5 mT
|
1.79 kg / 1790.0 g
17.6 N
|
low risk |
| 1 mm |
4915 Gs
491.5 mT
|
1.16 kg / 1156.7 g
11.3 N
|
low risk |
| 2 mm |
3833 Gs
383.3 mT
|
0.70 kg / 703.2 g
6.9 N
|
low risk |
| 3 mm |
2949 Gs
294.9 mT
|
0.42 kg / 416.3 g
4.1 N
|
low risk |
| 5 mm |
1761 Gs
176.1 mT
|
0.15 kg / 148.5 g
1.5 N
|
low risk |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 17.9 g
0.2 N
|
low risk |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 3.9 g
0.0 N
|
low risk |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 1.2 g
0.0 N
|
low risk |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.2 g
0.0 N
|
low risk |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.0 g
0.0 N
|
low risk |
Table 2: Slippage force (wall)
MP 10x6x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.36 kg / 358.0 g
3.5 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 232.0 g
2.3 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 140.0 g
1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 84.0 g
0.8 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 30.0 g
0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 4.0 g
0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 10x6x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.54 kg / 537.0 g
5.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.36 kg / 358.0 g
3.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.18 kg / 179.0 g
1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.90 kg / 895.0 g
8.8 N
|
Table 4: Material efficiency (substrate influence) - power losses
MP 10x6x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.18 kg / 179.0 g
1.8 N
|
| 1 mm |
|
0.45 kg / 447.5 g
4.4 N
|
| 2 mm |
|
0.90 kg / 895.0 g
8.8 N
|
| 5 mm |
|
1.79 kg / 1790.0 g
17.6 N
|
| 10 mm |
|
1.79 kg / 1790.0 g
17.6 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MP 10x6x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.79 kg / 1790.0 g
17.6 N
|
OK |
| 40 °C | -2.2% |
1.75 kg / 1750.6 g
17.2 N
|
OK |
| 60 °C | -4.4% |
1.71 kg / 1711.2 g
16.8 N
|
OK |
| 80 °C | -6.6% |
1.67 kg / 1671.9 g
16.4 N
|
|
| 100 °C | -28.8% |
1.27 kg / 1274.5 g
12.5 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 10x6x4 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
12.93 kg / 12926 g
126.8 N
6 169 Gs
|
N/A |
| 1 mm |
10.50 kg / 10505 g
103.1 N
11 025 Gs
|
9.45 kg / 9454 g
92.7 N
~0 Gs
|
| 2 mm |
8.35 kg / 8353 g
81.9 N
9 831 Gs
|
7.52 kg / 7518 g
73.7 N
~0 Gs
|
| 3 mm |
6.55 kg / 6547 g
64.2 N
8 703 Gs
|
5.89 kg / 5892 g
57.8 N
~0 Gs
|
| 5 mm |
3.91 kg / 3913 g
38.4 N
6 729 Gs
|
3.52 kg / 3522 g
34.5 N
~0 Gs
|
| 10 mm |
1.07 kg / 1072 g
10.5 N
3 522 Gs
|
0.96 kg / 965 g
9.5 N
~0 Gs
|
| 20 mm |
0.13 kg / 129 g
1.3 N
1 223 Gs
|
0.12 kg / 116 g
1.1 N
~0 Gs
|
| 50 mm |
0.00 kg / 3 g
0.0 N
194 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 5.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.0 cm |
| Remote | 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: Corrosion resistance
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 (Pc)
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. Shear force
*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) drastically reduces the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.44
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros and cons of neodymium magnets.
Advantages
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- Neodymium magnets remain extremely resistant to demagnetization caused by external field sources,
- A magnet with a shiny nickel surface is more attractive,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to freedom in constructing and the ability to customize to client solutions,
- Universal use in high-tech industry – they are used in HDD drives, motor assemblies, advanced medical instruments, and other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Limitations
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of creating threads in the magnet and complicated shapes - preferred is cover - magnetic holder.
- Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what affects it?
- on a base made of mild steel, effectively closing the magnetic flux
- with a cross-section minimum 10 mm
- characterized by lack of roughness
- with total lack of distance (no paint)
- for force applied at a right angle (in the magnet axis)
- at ambient temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
- Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
- Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.
Safety rules for work with neodymium magnets
Crushing force
Large magnets can break fingers in a fraction of a second. Do not put your hand between two strong magnets.
Protect data
Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Metal Allergy
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.
Heat warning
Do not overheat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
GPS Danger
Remember: neodymium magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.
Mechanical processing
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Caution required
Handle magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and respect their power.
Eye protection
Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them shattering into shards.
Pacemakers
Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Danger to the youngest
NdFeB magnets are not toys. Eating several magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.
