MP 41x15x10 / N38 - ring magnet
ring magnet
Catalog no 030200
GTIN/EAN: 5906301812173
Diameter
41 mm [±0,1 mm]
internal diameter Ø
15 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
85.77 g
Magnetization Direction
↑ axial
Load capacity
24.44 kg / 239.78 N
Magnetic Induction
271.77 mT / 2718 Gs
Coating
[NiCuNi] Nickel
50.00 ZŁ with VAT / pcs + price for transport
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Technical details - MP 41x15x10 / N38 - ring magnet
Specification / characteristics - MP 41x15x10 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030200 |
| GTIN/EAN | 5906301812173 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 41 mm [±0,1 mm] |
| internal diameter Ø | 15 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 85.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 24.44 kg / 239.78 N |
| Magnetic Induction ~ ? | 271.77 mT / 2718 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 simulation of the product - data
The following data represent the direct effect of a physical analysis. Values rely on models for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.
Table 1: Static pull force (pull vs distance) - power drop
MP 41x15x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5232 Gs
523.2 mT
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
critical level |
| 1 mm |
4978 Gs
497.8 mT
|
22.12 kg / 48.77 LBS
22120.4 g / 217.0 N
|
critical level |
| 2 mm |
4720 Gs
472.0 mT
|
19.89 kg / 43.85 LBS
19888.8 g / 195.1 N
|
critical level |
| 3 mm |
4464 Gs
446.4 mT
|
17.79 kg / 39.22 LBS
17788.4 g / 174.5 N
|
critical level |
| 5 mm |
3964 Gs
396.4 mT
|
14.03 kg / 30.93 LBS
14030.8 g / 137.6 N
|
critical level |
| 10 mm |
2861 Gs
286.1 mT
|
7.31 kg / 16.11 LBS
7308.1 g / 71.7 N
|
warning |
| 15 mm |
2028 Gs
202.8 mT
|
3.67 kg / 8.09 LBS
3670.1 g / 36.0 N
|
warning |
| 20 mm |
1443 Gs
144.3 mT
|
1.86 kg / 4.10 LBS
1858.4 g / 18.2 N
|
low risk |
| 30 mm |
770 Gs
77.0 mT
|
0.53 kg / 1.17 LBS
529.8 g / 5.2 N
|
low risk |
| 50 mm |
280 Gs
28.0 mT
|
0.07 kg / 0.15 LBS
69.8 g / 0.7 N
|
low risk |
Table 2: Sliding hold (wall)
MP 41x15x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
|
| 1 mm | Stal (~0.2) |
4.42 kg / 9.75 LBS
4424.0 g / 43.4 N
|
| 2 mm | Stal (~0.2) |
3.98 kg / 8.77 LBS
3978.0 g / 39.0 N
|
| 3 mm | Stal (~0.2) |
3.56 kg / 7.84 LBS
3558.0 g / 34.9 N
|
| 5 mm | Stal (~0.2) |
2.81 kg / 6.19 LBS
2806.0 g / 27.5 N
|
| 10 mm | Stal (~0.2) |
1.46 kg / 3.22 LBS
1462.0 g / 14.3 N
|
| 15 mm | Stal (~0.2) |
0.73 kg / 1.62 LBS
734.0 g / 7.2 N
|
| 20 mm | Stal (~0.2) |
0.37 kg / 0.82 LBS
372.0 g / 3.6 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
14.0 g / 0.1 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 41x15x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.33 kg / 16.16 LBS
7332.0 g / 71.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.44 kg / 5.39 LBS
2444.0 g / 24.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.22 kg / 26.94 LBS
12220.0 g / 119.9 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MP 41x15x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.22 kg / 2.69 LBS
1222.0 g / 12.0 N
|
| 1 mm |
|
3.06 kg / 6.74 LBS
3055.0 g / 30.0 N
|
| 2 mm |
|
6.11 kg / 13.47 LBS
6110.0 g / 59.9 N
|
| 3 mm |
|
9.17 kg / 20.21 LBS
9165.0 g / 89.9 N
|
| 5 mm |
|
15.28 kg / 33.68 LBS
15275.0 g / 149.8 N
|
| 10 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
| 11 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
| 12 mm |
|
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MP 41x15x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
|
OK |
| 40 °C | -2.2% |
23.90 kg / 52.70 LBS
23902.3 g / 234.5 N
|
OK |
| 60 °C | -4.4% |
23.36 kg / 51.51 LBS
23364.6 g / 229.2 N
|
OK |
| 80 °C | -6.6% |
22.83 kg / 50.32 LBS
22827.0 g / 223.9 N
|
|
| 100 °C | -28.8% |
17.40 kg / 38.36 LBS
17401.3 g / 170.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 41x15x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
178.13 kg / 392.71 LBS
5 907 Gs
|
26.72 kg / 58.91 LBS
26719 g / 262.1 N
|
N/A |
| 1 mm |
169.67 kg / 374.06 LBS
10 213 Gs
|
25.45 kg / 56.11 LBS
25451 g / 249.7 N
|
152.70 kg / 336.65 LBS
~0 Gs
|
| 2 mm |
161.22 kg / 355.43 LBS
9 955 Gs
|
24.18 kg / 53.32 LBS
24183 g / 237.2 N
|
145.10 kg / 319.89 LBS
~0 Gs
|
| 3 mm |
152.98 kg / 337.26 LBS
9 697 Gs
|
22.95 kg / 50.59 LBS
22947 g / 225.1 N
|
137.68 kg / 303.53 LBS
~0 Gs
|
| 5 mm |
137.18 kg / 302.42 LBS
9 183 Gs
|
20.58 kg / 45.36 LBS
20577 g / 201.9 N
|
123.46 kg / 272.18 LBS
~0 Gs
|
| 10 mm |
102.26 kg / 225.45 LBS
7 929 Gs
|
15.34 kg / 33.82 LBS
15339 g / 150.5 N
|
92.04 kg / 202.90 LBS
~0 Gs
|
| 20 mm |
53.26 kg / 117.43 LBS
5 722 Gs
|
7.99 kg / 17.61 LBS
7990 g / 78.4 N
|
47.94 kg / 105.69 LBS
~0 Gs
|
| 50 mm |
7.08 kg / 15.62 LBS
2 087 Gs
|
1.06 kg / 2.34 LBS
1063 g / 10.4 N
|
6.38 kg / 14.06 LBS
~0 Gs
|
| 60 mm |
3.86 kg / 8.51 LBS
1 541 Gs
|
0.58 kg / 1.28 LBS
579 g / 5.7 N
|
3.48 kg / 7.66 LBS
~0 Gs
|
| 70 mm |
2.20 kg / 4.84 LBS
1 162 Gs
|
0.33 kg / 0.73 LBS
330 g / 3.2 N
|
1.98 kg / 4.36 LBS
~0 Gs
|
| 80 mm |
1.30 kg / 2.87 LBS
895 Gs
|
0.20 kg / 0.43 LBS
195 g / 1.9 N
|
1.17 kg / 2.58 LBS
~0 Gs
|
| 90 mm |
0.80 kg / 1.76 LBS
701 Gs
|
0.12 kg / 0.26 LBS
120 g / 1.2 N
|
0.72 kg / 1.59 LBS
~0 Gs
|
| 100 mm |
0.51 kg / 1.12 LBS
559 Gs
|
0.08 kg / 0.17 LBS
76 g / 0.7 N
|
0.46 kg / 1.01 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MP 41x15x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 24.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 19.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 15.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 11.5 cm |
| Car key | 50 Gs (5.0 mT) | 10.5 cm |
| Payment card | 400 Gs (40.0 mT) | 4.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.5 cm |
Table 8: Dynamics (kinetic energy) - warning
MP 41x15x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.95 km/h
(5.54 m/s)
|
1.32 J | |
| 30 mm |
29.88 km/h
(8.30 m/s)
|
2.96 J | |
| 50 mm |
38.13 km/h
(10.59 m/s)
|
4.81 J | |
| 100 mm |
53.84 km/h
(14.96 m/s)
|
9.59 J |
Table 9: Corrosion resistance
MP 41x15x10 / 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 41x15x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 56 505 Mx | 565.0 µWb |
| Pc Coefficient | 0.80 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MP 41x15x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 24.44 kg | Standard |
| Water (riverbed) |
27.98 kg
(+3.54 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Thermal stability
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.80
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 |
View also proposals
Strengths and weaknesses of rare earth magnets.
Pros
- They retain full power for around ten years – the loss is just ~1% (according to analyses),
- Neodymium magnets prove to be extremely resistant to demagnetization caused by external field sources,
- A magnet with a shiny silver surface is more attractive,
- Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
- 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 individual machining and adapting to individual needs,
- Key role in electronics industry – they are commonly used in HDD drives, drive modules, diagnostic systems, also other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Cons
- To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets decrease their force 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
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a block made of mild steel, optimally conducting the magnetic field
- with a thickness no less than 10 mm
- with an ground touching surface
- without any clearance between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at ambient temperature room level
Lifting capacity in practice – influencing factors
- Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped to the other side.
- Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
- Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate decreases the holding force.
Precautions when working with neodymium magnets
Heat sensitivity
Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.
Allergic reactions
It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent direct skin contact and choose encased magnets.
Crushing risk
Large magnets can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.
Fire risk
Powder created during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Data carriers
Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
GPS Danger
Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Danger to pacemakers
For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.
Shattering risk
Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Do not underestimate power
Use magnets consciously. Their powerful strength can surprise even professionals. Stay alert and do not underestimate their power.
Danger to the youngest
These products are not intended for children. Swallowing several magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.
