MP 10x4.3x4 / N38 - ring magnet
ring magnet
Catalog no 030178
GTIN/EAN: 5906301811954
Diameter
10 mm [±0,1 mm]
internal diameter Ø
4.3 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
1.92 g
Magnetization Direction
↑ axial
Load capacity
2.28 kg / 22.35 N
Magnetic Induction
386.91 mT / 3869 Gs
Coating
[NiCuNi] Nickel
1.045 ZŁ with VAT / pcs + price for transport
0.850 ZŁ net + 23% VAT / pcs
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Technical - MP 10x4.3x4 / N38 - ring magnet
Specification / characteristics - MP 10x4.3x4 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030178 |
| GTIN/EAN | 5906301811954 |
| 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 | 4.3 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 1.92 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.28 kg / 22.35 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 |
Engineering modeling of the assembly - report
The following data constitute the direct effect of a mathematical calculation. Values are based on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.
Table 1: Static force (pull vs gap) - characteristics
MP 10x4.3x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6115 Gs
611.5 mT
|
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
warning |
| 1 mm |
4915 Gs
491.5 mT
|
1.47 kg / 3.25 LBS
1473.3 g / 14.5 N
|
weak grip |
| 2 mm |
3833 Gs
383.3 mT
|
0.90 kg / 1.97 LBS
895.7 g / 8.8 N
|
weak grip |
| 3 mm |
2949 Gs
294.9 mT
|
0.53 kg / 1.17 LBS
530.3 g / 5.2 N
|
weak grip |
| 5 mm |
1761 Gs
176.1 mT
|
0.19 kg / 0.42 LBS
189.1 g / 1.9 N
|
weak grip |
| 10 mm |
612 Gs
61.2 mT
|
0.02 kg / 0.05 LBS
22.8 g / 0.2 N
|
weak grip |
| 15 mm |
284 Gs
28.4 mT
|
0.00 kg / 0.01 LBS
4.9 g / 0.0 N
|
weak grip |
| 20 mm |
157 Gs
15.7 mT
|
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
|
weak grip |
| 30 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.00 LBS
0.3 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: Shear force (vertical surface)
MP 10x4.3x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.46 kg / 1.01 LBS
456.0 g / 4.5 N
|
| 1 mm | Stal (~0.2) |
0.29 kg / 0.65 LBS
294.0 g / 2.9 N
|
| 2 mm | Stal (~0.2) |
0.18 kg / 0.40 LBS
180.0 g / 1.8 N
|
| 3 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 5 mm | Stal (~0.2) |
0.04 kg / 0.08 LBS
38.0 g / 0.4 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: Wall mounting (shearing) - behavior on slippery surfaces
MP 10x4.3x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.68 kg / 1.51 LBS
684.0 g / 6.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.46 kg / 1.01 LBS
456.0 g / 4.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.50 LBS
228.0 g / 2.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 10x4.3x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.50 LBS
228.0 g / 2.2 N
|
| 1 mm |
|
0.57 kg / 1.26 LBS
570.0 g / 5.6 N
|
| 2 mm |
|
1.14 kg / 2.51 LBS
1140.0 g / 11.2 N
|
| 3 mm |
|
1.71 kg / 3.77 LBS
1710.0 g / 16.8 N
|
| 5 mm |
|
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
| 10 mm |
|
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
| 11 mm |
|
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
| 12 mm |
|
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MP 10x4.3x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.28 kg / 5.03 LBS
2280.0 g / 22.4 N
|
OK |
| 40 °C | -2.2% |
2.23 kg / 4.92 LBS
2229.8 g / 21.9 N
|
OK |
| 60 °C | -4.4% |
2.18 kg / 4.81 LBS
2179.7 g / 21.4 N
|
OK |
| 80 °C | -6.6% |
2.13 kg / 4.69 LBS
2129.5 g / 20.9 N
|
|
| 100 °C | -28.8% |
1.62 kg / 3.58 LBS
1623.4 g / 15.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 10x4.3x4 / 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 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: Protective zones (electronics) - precautionary measures
MP 10x4.3x4 / 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 (kinetic energy) - collision effects
MP 10x4.3x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
34.97 km/h
(9.71 m/s)
|
0.09 J | |
| 30 mm |
60.20 km/h
(16.72 m/s)
|
0.27 J | |
| 50 mm |
77.71 km/h
(21.59 m/s)
|
0.45 J | |
| 100 mm |
109.90 km/h
(30.53 m/s)
|
0.89 J |
Table 9: Corrosion resistance
MP 10x4.3x4 / 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 10x4.3x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 017 Mx | 40.2 µWb |
| Pc Coefficient | 1.44 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MP 10x4.3x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.28 kg | Standard |
| Water (riverbed) |
2.61 kg
(+0.33 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds merely a fraction of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For standard magnets, 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.
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 |
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Strengths and weaknesses of neodymium magnets.
Advantages
- Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
- They do not lose their magnetic properties even under close interference source,
- A magnet with a metallic gold surface is more attractive,
- Magnets have impressive magnetic induction on the working surface,
- 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 forming and the capacity to customize to individual projects,
- Universal use in modern industrial fields – they are commonly used in HDD drives, drive modules, medical devices, as well as modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- 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
- Limited ability of producing threads in the magnet and complex shapes - recommended is casing - magnetic holder.
- Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
- Due to complex production process, their price is higher than average,
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- using a plate made of low-carbon steel, acting as a magnetic yoke
- with a cross-section of at least 10 mm
- with a surface cleaned and smooth
- without any insulating layer between the magnet and steel
- under axial application of breakaway force (90-degree angle)
- at standard ambient temperature
Magnet lifting force in use – key factors
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be lost into the air.
- Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
- Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.
Safety rules for work with NdFeB magnets
Magnetic media
Do not bring magnets close to a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.
Warning for heart patients
For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.
Fragile material
Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.
Crushing force
Large magnets can smash fingers in a fraction of a second. Never place your hand betwixt two attracting surfaces.
Maximum temperature
Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).
Safe operation
Handle magnets consciously. Their immense force can surprise even professionals. Plan your moves and do not underestimate their force.
Do not drill into magnets
Powder produced during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Product not for children
Always keep magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.
Magnetic interference
An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid breaking the sensors.
Warning for allergy sufferers
A percentage of the population suffer from a sensitization to Ni, which is the common plating for neodymium magnets. Prolonged contact can result in a rash. We suggest use protective gloves.
