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
bulk discounts:
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Detailed specification - 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 modeling of the magnet - data
These values constitute the outcome of a physical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world parameters may differ. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs distance) - power drop
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
|
low risk |
| 1 mm |
4915 Gs
491.5 mT
|
1.16 kg / 2.55 pounds
1156.7 g / 11.3 N
|
low risk |
| 2 mm |
3833 Gs
383.3 mT
|
0.70 kg / 1.55 pounds
703.2 g / 6.9 N
|
low risk |
| 3 mm |
2949 Gs
294.9 mT
|
0.42 kg / 0.92 pounds
416.3 g / 4.1 N
|
low risk |
| 5 mm |
1761 Gs
176.1 mT
|
0.15 kg / 0.33 pounds
148.5 g / 1.5 N
|
low risk |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 0.04 pounds
17.9 g / 0.2 N
|
low risk |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 0.01 pounds
3.9 g / 0.0 N
|
low risk |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 0.00 pounds
1.2 g / 0.0 N
|
low risk |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
low risk |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Sliding 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: Wall mounting (sliding) - 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 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 (saturation) - power losses
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) - resistance threshold
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 (repulsion) - forces in the system
MP 10x6x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: 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: Dynamics (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. Vertical hold
*Note: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Thermal stability
*For N38 material, the safety limit 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.
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% |
Environmental data
| 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.
Benefits
- They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- Neodymium magnets are extremely resistant to loss of magnetic properties caused by external field sources,
- The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the potential of free forming and adaptation to specialized projects, NdFeB magnets can be created in a broad palette of shapes and sizes, which makes them more universal,
- Significant place in advanced technology sectors – they find application in computer drives, electromotive mechanisms, medical equipment, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We recommend casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- on a block made of mild steel, perfectly concentrating the magnetic flux
- whose thickness equals approx. 10 mm
- characterized by smoothness
- under conditions of ideal adhesion (surface-to-surface)
- during detachment in a direction perpendicular to the plane
- at temperature approx. 20 degrees Celsius
Lifting capacity in real conditions – factors
- Air gap (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Steel type – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Warnings
Danger to the youngest
Product intended for adults. Small elements can be swallowed, leading to serious injuries. Keep out of reach of children and animals.
Medical interference
For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.
Dust is flammable
Dust generated during machining of magnets is combustible. Do not drill into magnets unless you are an expert.
Fragile material
Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Data carriers
Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Precision electronics
Navigation devices and smartphones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Physical harm
Danger of trauma: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Safe operation
Use magnets consciously. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.
Maximum temperature
Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).
Skin irritation risks
A percentage of the population experience a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause dermatitis. It is best to wear protective gloves.
