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
40.65 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical parameters of the product - 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 |
Physical simulation of the product - technical parameters
These values are the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs gap) - interaction chart
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 pounds
24440.0 g / 239.8 N
|
crushing |
| 1 mm |
4978 Gs
497.8 mT
|
22.12 kg / 48.77 pounds
22120.4 g / 217.0 N
|
crushing |
| 2 mm |
4720 Gs
472.0 mT
|
19.89 kg / 43.85 pounds
19888.8 g / 195.1 N
|
crushing |
| 3 mm |
4464 Gs
446.4 mT
|
17.79 kg / 39.22 pounds
17788.4 g / 174.5 N
|
crushing |
| 5 mm |
3964 Gs
396.4 mT
|
14.03 kg / 30.93 pounds
14030.8 g / 137.6 N
|
crushing |
| 10 mm |
2861 Gs
286.1 mT
|
7.31 kg / 16.11 pounds
7308.1 g / 71.7 N
|
warning |
| 15 mm |
2028 Gs
202.8 mT
|
3.67 kg / 8.09 pounds
3670.1 g / 36.0 N
|
warning |
| 20 mm |
1443 Gs
144.3 mT
|
1.86 kg / 4.10 pounds
1858.4 g / 18.2 N
|
safe |
| 30 mm |
770 Gs
77.0 mT
|
0.53 kg / 1.17 pounds
529.8 g / 5.2 N
|
safe |
| 50 mm |
280 Gs
28.0 mT
|
0.07 kg / 0.15 pounds
69.8 g / 0.7 N
|
safe |
Table 2: Vertical load (vertical surface)
MP 41x15x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.89 kg / 10.78 pounds
4888.0 g / 48.0 N
|
| 1 mm | Stal (~0.2) |
4.42 kg / 9.75 pounds
4424.0 g / 43.4 N
|
| 2 mm | Stal (~0.2) |
3.98 kg / 8.77 pounds
3978.0 g / 39.0 N
|
| 3 mm | Stal (~0.2) |
3.56 kg / 7.84 pounds
3558.0 g / 34.9 N
|
| 5 mm | Stal (~0.2) |
2.81 kg / 6.19 pounds
2806.0 g / 27.5 N
|
| 10 mm | Stal (~0.2) |
1.46 kg / 3.22 pounds
1462.0 g / 14.3 N
|
| 15 mm | Stal (~0.2) |
0.73 kg / 1.62 pounds
734.0 g / 7.2 N
|
| 20 mm | Stal (~0.2) |
0.37 kg / 0.82 pounds
372.0 g / 3.6 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.23 pounds
106.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - vertical pull
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 pounds
7332.0 g / 71.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.89 kg / 10.78 pounds
4888.0 g / 48.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.44 kg / 5.39 pounds
2444.0 g / 24.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
12.22 kg / 26.94 pounds
12220.0 g / 119.9 N
|
Table 4: Material efficiency (saturation) - power losses
MP 41x15x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.22 kg / 2.69 pounds
1222.0 g / 12.0 N
|
| 1 mm |
|
3.06 kg / 6.74 pounds
3055.0 g / 30.0 N
|
| 2 mm |
|
6.11 kg / 13.47 pounds
6110.0 g / 59.9 N
|
| 3 mm |
|
9.17 kg / 20.21 pounds
9165.0 g / 89.9 N
|
| 5 mm |
|
15.28 kg / 33.68 pounds
15275.0 g / 149.8 N
|
| 10 mm |
|
24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
|
| 11 mm |
|
24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
|
| 12 mm |
|
24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MP 41x15x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
24.44 kg / 53.88 pounds
24440.0 g / 239.8 N
|
OK |
| 40 °C | -2.2% |
23.90 kg / 52.70 pounds
23902.3 g / 234.5 N
|
OK |
| 60 °C | -4.4% |
23.36 kg / 51.51 pounds
23364.6 g / 229.2 N
|
OK |
| 80 °C | -6.6% |
22.83 kg / 50.32 pounds
22827.0 g / 223.9 N
|
|
| 100 °C | -28.8% |
17.40 kg / 38.36 pounds
17401.3 g / 170.7 N
|
Table 6: Two magnets (attraction) - field collision
MP 41x15x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
178.13 kg / 392.71 pounds
5 907 Gs
|
26.72 kg / 58.91 pounds
26719 g / 262.1 N
|
N/A |
| 1 mm |
169.67 kg / 374.06 pounds
10 213 Gs
|
25.45 kg / 56.11 pounds
25451 g / 249.7 N
|
152.70 kg / 336.65 pounds
~0 Gs
|
| 2 mm |
161.22 kg / 355.43 pounds
9 955 Gs
|
24.18 kg / 53.32 pounds
24183 g / 237.2 N
|
145.10 kg / 319.89 pounds
~0 Gs
|
| 3 mm |
152.98 kg / 337.26 pounds
9 697 Gs
|
22.95 kg / 50.59 pounds
22947 g / 225.1 N
|
137.68 kg / 303.53 pounds
~0 Gs
|
| 5 mm |
137.18 kg / 302.42 pounds
9 183 Gs
|
20.58 kg / 45.36 pounds
20577 g / 201.9 N
|
123.46 kg / 272.18 pounds
~0 Gs
|
| 10 mm |
102.26 kg / 225.45 pounds
7 929 Gs
|
15.34 kg / 33.82 pounds
15339 g / 150.5 N
|
92.04 kg / 202.90 pounds
~0 Gs
|
| 20 mm |
53.26 kg / 117.43 pounds
5 722 Gs
|
7.99 kg / 17.61 pounds
7990 g / 78.4 N
|
47.94 kg / 105.69 pounds
~0 Gs
|
| 50 mm |
7.08 kg / 15.62 pounds
2 087 Gs
|
1.06 kg / 2.34 pounds
1063 g / 10.4 N
|
6.38 kg / 14.06 pounds
~0 Gs
|
| 60 mm |
3.86 kg / 8.51 pounds
1 541 Gs
|
0.58 kg / 1.28 pounds
579 g / 5.7 N
|
3.48 kg / 7.66 pounds
~0 Gs
|
| 70 mm |
2.20 kg / 4.84 pounds
1 162 Gs
|
0.33 kg / 0.73 pounds
330 g / 3.2 N
|
1.98 kg / 4.36 pounds
~0 Gs
|
| 80 mm |
1.30 kg / 2.87 pounds
895 Gs
|
0.20 kg / 0.43 pounds
195 g / 1.9 N
|
1.17 kg / 2.58 pounds
~0 Gs
|
| 90 mm |
0.80 kg / 1.76 pounds
701 Gs
|
0.12 kg / 0.26 pounds
120 g / 1.2 N
|
0.72 kg / 1.59 pounds
~0 Gs
|
| 100 mm |
0.51 kg / 1.12 pounds
559 Gs
|
0.08 kg / 0.17 pounds
76 g / 0.7 N
|
0.46 kg / 1.01 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
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 |
| Mobile device | 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) - collision effects
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: Coating parameters (durability)
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 (Flux)
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. Shear force
*Warning: On a vertical wall, the magnet retains only ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) drastically limits the holding force.
3. Heat tolerance
*For standard magnets, 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
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.
Material specification
| 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 deals
Advantages as well as disadvantages of Nd2Fe14B magnets.
Pros
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- Neodymium magnets remain exceptionally resistant to demagnetization caused by external magnetic fields,
- In other words, due to the metallic layer of silver, the element gains visual value,
- Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to versatility in designing and the capacity to modify to unusual requirements,
- Significant place in innovative solutions – they are used in mass storage devices, electric drive systems, precision medical tools, and complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Disadvantages
- At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- We suggest cover - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
- Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Maximum holding power of the magnet – what it depends on?
- on a base made of structural steel, perfectly concentrating the magnetic field
- whose thickness is min. 10 mm
- characterized by lack of roughness
- without any insulating layer between the magnet and steel
- under perpendicular force direction (90-degree angle)
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Clearance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be lost into the air.
- Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.
Safe handling of neodymium magnets
Magnetic media
Do not bring magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
Dust explosion hazard
Powder created during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Handling rules
Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.
Beware of splinters
Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Danger to pacemakers
Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Keep away from children
Neodymium magnets are not intended for children. Swallowing a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.
Allergy Warning
It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and choose encased magnets.
Phone sensors
Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.
Bone fractures
Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.
Thermal limits
Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.
