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 - 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 |
Physical simulation of the magnet - data
These values represent the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Actual performance may differ. Treat these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - characteristics
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 pounds
1790.0 g / 17.6 N
|
safe |
| 1 mm |
4915 Gs
491.5 mT
|
1.16 kg / 2.55 pounds
1156.7 g / 11.3 N
|
safe |
| 2 mm |
3833 Gs
383.3 mT
|
0.70 kg / 1.55 pounds
703.2 g / 6.9 N
|
safe |
| 3 mm |
2949 Gs
294.9 mT
|
0.42 kg / 0.92 pounds
416.3 g / 4.1 N
|
safe |
| 5 mm |
1761 Gs
176.1 mT
|
0.15 kg / 0.33 pounds
148.5 g / 1.5 N
|
safe |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 0.04 pounds
17.9 g / 0.2 N
|
safe |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 0.01 pounds
3.9 g / 0.0 N
|
safe |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
|
safe |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Shear load (wall)
MP 10x6x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.36 kg / 0.79 pounds
358.0 g / 3.5 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 pounds
232.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.14 kg / 0.31 pounds
140.0 g / 1.4 N
|
| 3 mm | Stal (~0.2) |
0.08 kg / 0.19 pounds
84.0 g / 0.8 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
30.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
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 pounds
537.0 g / 5.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.36 kg / 0.79 pounds
358.0 g / 3.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.18 kg / 0.39 pounds
179.0 g / 1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.90 kg / 1.97 pounds
895.0 g / 8.8 N
|
Table 4: Material efficiency (substrate influence) - 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 pounds
179.0 g / 1.8 N
|
| 1 mm |
|
0.45 kg / 0.99 pounds
447.5 g / 4.4 N
|
| 2 mm |
|
0.90 kg / 1.97 pounds
895.0 g / 8.8 N
|
| 3 mm |
|
1.34 kg / 2.96 pounds
1342.5 g / 13.2 N
|
| 5 mm |
|
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
|
| 10 mm |
|
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
|
| 11 mm |
|
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
|
| 12 mm |
|
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
|
Table 5: Thermal stability (stability) - power drop
MP 10x6x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
|
OK |
| 40 °C | -2.2% |
1.75 kg / 3.86 pounds
1750.6 g / 17.2 N
|
OK |
| 60 °C | -4.4% |
1.71 kg / 3.77 pounds
1711.2 g / 16.8 N
|
OK |
| 80 °C | -6.6% |
1.67 kg / 3.69 pounds
1671.9 g / 16.4 N
|
|
| 100 °C | -28.8% |
1.27 kg / 2.81 pounds
1274.5 g / 12.5 N
|
Table 6: Two magnets (attraction) - field collision
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 pounds
6 169 Gs
|
1.94 kg / 4.27 pounds
1939 g / 19.0 N
|
N/A |
| 1 mm |
10.50 kg / 23.16 pounds
11 025 Gs
|
1.58 kg / 3.47 pounds
1576 g / 15.5 N
|
9.45 kg / 20.84 pounds
~0 Gs
|
| 2 mm |
8.35 kg / 18.41 pounds
9 831 Gs
|
1.25 kg / 2.76 pounds
1253 g / 12.3 N
|
7.52 kg / 16.57 pounds
~0 Gs
|
| 3 mm |
6.55 kg / 14.43 pounds
8 703 Gs
|
0.98 kg / 2.17 pounds
982 g / 9.6 N
|
5.89 kg / 12.99 pounds
~0 Gs
|
| 5 mm |
3.91 kg / 8.63 pounds
6 729 Gs
|
0.59 kg / 1.29 pounds
587 g / 5.8 N
|
3.52 kg / 7.76 pounds
~0 Gs
|
| 10 mm |
1.07 kg / 2.36 pounds
3 522 Gs
|
0.16 kg / 0.35 pounds
161 g / 1.6 N
|
0.96 kg / 2.13 pounds
~0 Gs
|
| 20 mm |
0.13 kg / 0.29 pounds
1 223 Gs
|
0.02 kg / 0.04 pounds
19 g / 0.2 N
|
0.12 kg / 0.26 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 pounds
194 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
129 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
91 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
66 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
50 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
39 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (implants) - 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: Impact energy (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: Anti-corrosion coating 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: Physics of underwater searching
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 wall, the magnet retains only a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely weakens 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% |
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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Strengths as well as weaknesses of rare earth magnets.
Strengths
- They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
- Magnets very well resist against loss of magnetization caused by foreign field sources,
- In other words, due to the aesthetic surface of silver, the element gains a professional look,
- The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- In view of the possibility of free molding and customization to specialized projects, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
- Versatile presence in innovative solutions – they find application in hard drives, brushless drives, diagnostic systems, also multitasking production systems.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. 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 advise 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 stable to moisture, in case of application outdoors
- Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
- Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
- With budget limitations the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum lifting capacity of the magnet – what contributes to it?
- on a block made of structural steel, optimally conducting the magnetic field
- whose transverse dimension equals approx. 10 mm
- characterized by even structure
- with direct contact (without paint)
- during detachment in a direction vertical to the mounting surface
- in neutral thermal conditions
What influences lifting capacity in practice
- Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
- Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
- Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.
Precautions when working with neodymium magnets
Do not drill into magnets
Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Physical harm
Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Skin irritation risks
Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop handling magnets and use protective gear.
Impact on smartphones
An intense magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.
Magnet fragility
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.
Permanent damage
Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.
Warning for heart patients
For implant holders: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.
Immense force
Use magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their force.
Choking Hazard
Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.
Keep away from computers
Do not bring magnets near a purse, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.
