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
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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 |
Physical modeling of the assembly - report
Presented information are the direct effect of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (pull vs distance) - 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 lbs
24440.0 g / 239.8 N
|
dangerous! |
| 1 mm |
4978 Gs
497.8 mT
|
22.12 kg / 48.77 lbs
22120.4 g / 217.0 N
|
dangerous! |
| 2 mm |
4720 Gs
472.0 mT
|
19.89 kg / 43.85 lbs
19888.8 g / 195.1 N
|
dangerous! |
| 3 mm |
4464 Gs
446.4 mT
|
17.79 kg / 39.22 lbs
17788.4 g / 174.5 N
|
dangerous! |
| 5 mm |
3964 Gs
396.4 mT
|
14.03 kg / 30.93 lbs
14030.8 g / 137.6 N
|
dangerous! |
| 10 mm |
2861 Gs
286.1 mT
|
7.31 kg / 16.11 lbs
7308.1 g / 71.7 N
|
strong |
| 15 mm |
2028 Gs
202.8 mT
|
3.67 kg / 8.09 lbs
3670.1 g / 36.0 N
|
strong |
| 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: Slippage capacity (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 (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 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: Steel thickness (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 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: Working in heat (stability) - power drop
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 (repulsion) - field range
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: Protective zones (implants) - 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 |
| Mobile device | 40 Gs (4.0 mT) | 11.5 cm |
| Remote | 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: Impact energy (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: Surface protection spec
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. Vertical hold
*Note: On a vertical wall, the magnet holds only ~20% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Temperature resistance
*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) = 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also deals
Pros as well as cons of rare earth magnets.
Advantages
- They do not lose power, even over nearly ten years – the decrease in power is only ~1% (theoretically),
- They show high resistance to demagnetization induced by external magnetic fields,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- They are known for high magnetic induction at the operating surface, which affects their effectiveness,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of exact forming and adjusting to atypical conditions,
- Universal use in electronics industry – they serve a role in mass storage devices, electric drive systems, medical devices, also industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Maximum lifting force for a neodymium magnet – what contributes to it?
- on a plate made of structural steel, optimally conducting the magnetic flux
- whose thickness reaches at least 10 mm
- with a surface perfectly flat
- with total lack of distance (no coatings)
- during pulling in a direction vertical to the plane
- in temp. approx. 20°C
Practical lifting capacity: influencing factors
- Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
- Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate decreases the load capacity.
Safety rules for work with neodymium magnets
Dust is flammable
Mechanical processing of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Warning for heart patients
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
Immense force
Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.
Eye protection
Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Demagnetization risk
Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.
Threat to navigation
Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.
Avoid contact if allergic
Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching might lead to skin redness. It is best to wear safety gloves.
Keep away from computers
Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).
Do not give to children
Strictly store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are life-threatening.
Bodily injuries
Big blocks can crush fingers instantly. Do not put your hand between two attracting surfaces.
