MP 62x42x25 / N38 - ring magnet
ring magnet
Catalog no 030205
GTIN/EAN: 5906301812227
Diameter
62 mm [±0,1 mm]
internal diameter Ø
42 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
306.31 g
Magnetization Direction
↑ axial
Load capacity
58.67 kg / 575.60 N
Magnetic Induction
389.14 mT / 3891 Gs
Coating
[NiCuNi] Nickel
165.00 ZŁ with VAT / pcs + price for transport
134.15 ZŁ net + 23% VAT / pcs
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Technical details - MP 62x42x25 / N38 - ring magnet
Specification / characteristics - MP 62x42x25 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030205 |
| GTIN/EAN | 5906301812227 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 62 mm [±0,1 mm] |
| internal diameter Ø | 42 mm [±0,1 mm] |
| Height | 25 mm [±0,1 mm] |
| Weight | 306.31 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 58.67 kg / 575.60 N |
| Magnetic Induction ~ ? | 389.14 mT / 3891 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 - data
The following information represent the direct effect of a physical simulation. Values were calculated on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
MP 62x42x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4472 Gs
447.2 mT
|
58.67 kg / 129.35 pounds
58670.0 g / 575.6 N
|
dangerous! |
| 1 mm |
4338 Gs
433.8 mT
|
55.21 kg / 121.72 pounds
55213.2 g / 541.6 N
|
dangerous! |
| 2 mm |
4201 Gs
420.1 mT
|
51.77 kg / 114.13 pounds
51768.5 g / 507.8 N
|
dangerous! |
| 3 mm |
4061 Gs
406.1 mT
|
48.39 kg / 106.69 pounds
48394.9 g / 474.8 N
|
dangerous! |
| 5 mm |
3781 Gs
378.1 mT
|
41.94 kg / 92.47 pounds
41942.4 g / 411.5 N
|
dangerous! |
| 10 mm |
3097 Gs
309.7 mT
|
28.15 kg / 62.06 pounds
28148.0 g / 276.1 N
|
dangerous! |
| 15 mm |
2485 Gs
248.5 mT
|
18.12 kg / 39.94 pounds
18118.5 g / 177.7 N
|
dangerous! |
| 20 mm |
1972 Gs
197.2 mT
|
11.41 kg / 25.16 pounds
11412.7 g / 112.0 N
|
dangerous! |
| 30 mm |
1239 Gs
123.9 mT
|
4.51 kg / 9.93 pounds
4505.2 g / 44.2 N
|
warning |
| 50 mm |
533 Gs
53.3 mT
|
0.83 kg / 1.84 pounds
832.4 g / 8.2 N
|
low risk |
Table 2: Vertical hold (vertical surface)
MP 62x42x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
11.73 kg / 25.87 pounds
11734.0 g / 115.1 N
|
| 1 mm | Stal (~0.2) |
11.04 kg / 24.34 pounds
11042.0 g / 108.3 N
|
| 2 mm | Stal (~0.2) |
10.35 kg / 22.83 pounds
10354.0 g / 101.6 N
|
| 3 mm | Stal (~0.2) |
9.68 kg / 21.34 pounds
9678.0 g / 94.9 N
|
| 5 mm | Stal (~0.2) |
8.39 kg / 18.49 pounds
8388.0 g / 82.3 N
|
| 10 mm | Stal (~0.2) |
5.63 kg / 12.41 pounds
5630.0 g / 55.2 N
|
| 15 mm | Stal (~0.2) |
3.62 kg / 7.99 pounds
3624.0 g / 35.6 N
|
| 20 mm | Stal (~0.2) |
2.28 kg / 5.03 pounds
2282.0 g / 22.4 N
|
| 30 mm | Stal (~0.2) |
0.90 kg / 1.99 pounds
902.0 g / 8.8 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
166.0 g / 1.6 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 62x42x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
17.60 kg / 38.80 pounds
17601.0 g / 172.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
11.73 kg / 25.87 pounds
11734.0 g / 115.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
5.87 kg / 12.93 pounds
5867.0 g / 57.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
29.34 kg / 64.67 pounds
29335.0 g / 287.8 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MP 62x42x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.96 kg / 4.31 pounds
1955.7 g / 19.2 N
|
| 1 mm |
|
4.89 kg / 10.78 pounds
4889.2 g / 48.0 N
|
| 2 mm |
|
9.78 kg / 21.56 pounds
9778.3 g / 95.9 N
|
| 3 mm |
|
14.67 kg / 32.34 pounds
14667.5 g / 143.9 N
|
| 5 mm |
|
24.45 kg / 53.89 pounds
24445.8 g / 239.8 N
|
| 10 mm |
|
48.89 kg / 107.79 pounds
48891.7 g / 479.6 N
|
| 11 mm |
|
53.78 kg / 118.57 pounds
53780.8 g / 527.6 N
|
| 12 mm |
|
58.67 kg / 129.35 pounds
58670.0 g / 575.6 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MP 62x42x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
58.67 kg / 129.35 pounds
58670.0 g / 575.6 N
|
OK |
| 40 °C | -2.2% |
57.38 kg / 126.50 pounds
57379.3 g / 562.9 N
|
OK |
| 60 °C | -4.4% |
56.09 kg / 123.65 pounds
56088.5 g / 550.2 N
|
OK |
| 80 °C | -6.6% |
54.80 kg / 120.81 pounds
54797.8 g / 537.6 N
|
|
| 100 °C | -28.8% |
41.77 kg / 92.09 pounds
41773.0 g / 409.8 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 62x42x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
264.93 kg / 584.07 pounds
5 588 Gs
|
39.74 kg / 87.61 pounds
39740 g / 389.8 N
|
N/A |
| 1 mm |
257.19 kg / 567.00 pounds
8 812 Gs
|
38.58 kg / 85.05 pounds
38578 g / 378.4 N
|
231.47 kg / 510.30 pounds
~0 Gs
|
| 2 mm |
249.32 kg / 549.66 pounds
8 676 Gs
|
37.40 kg / 82.45 pounds
37398 g / 366.9 N
|
224.39 kg / 494.69 pounds
~0 Gs
|
| 3 mm |
241.51 kg / 532.44 pounds
8 539 Gs
|
36.23 kg / 79.87 pounds
36227 g / 355.4 N
|
217.36 kg / 479.19 pounds
~0 Gs
|
| 5 mm |
226.10 kg / 498.47 pounds
8 262 Gs
|
33.92 kg / 74.77 pounds
33915 g / 332.7 N
|
203.49 kg / 448.62 pounds
~0 Gs
|
| 10 mm |
189.40 kg / 417.55 pounds
7 562 Gs
|
28.41 kg / 62.63 pounds
28409 g / 278.7 N
|
170.46 kg / 375.79 pounds
~0 Gs
|
| 20 mm |
127.11 kg / 280.22 pounds
6 195 Gs
|
19.07 kg / 42.03 pounds
19066 g / 187.0 N
|
114.40 kg / 252.20 pounds
~0 Gs
|
| 50 mm |
32.28 kg / 71.17 pounds
3 122 Gs
|
4.84 kg / 10.68 pounds
4843 g / 47.5 N
|
29.06 kg / 64.06 pounds
~0 Gs
|
| 60 mm |
20.34 kg / 44.85 pounds
2 478 Gs
|
3.05 kg / 6.73 pounds
3052 g / 29.9 N
|
18.31 kg / 40.36 pounds
~0 Gs
|
| 70 mm |
12.99 kg / 28.63 pounds
1 980 Gs
|
1.95 kg / 4.29 pounds
1948 g / 19.1 N
|
11.69 kg / 25.77 pounds
~0 Gs
|
| 80 mm |
8.43 kg / 18.59 pounds
1 595 Gs
|
1.26 kg / 2.79 pounds
1265 g / 12.4 N
|
7.59 kg / 16.73 pounds
~0 Gs
|
| 90 mm |
5.58 kg / 12.29 pounds
1 298 Gs
|
0.84 kg / 1.84 pounds
836 g / 8.2 N
|
5.02 kg / 11.06 pounds
~0 Gs
|
| 100 mm |
3.76 kg / 8.29 pounds
1 065 Gs
|
0.56 kg / 1.24 pounds
564 g / 5.5 N
|
3.38 kg / 7.46 pounds
~0 Gs
|
Table 7: Hazards (implants) - warnings
MP 62x42x25 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 32.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 25.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 20.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 15.5 cm |
| Remote | 50 Gs (5.0 mT) | 14.0 cm |
| Payment card | 400 Gs (40.0 mT) | 6.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 5.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MP 62x42x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.65 km/h
(4.90 m/s)
|
3.68 J | |
| 30 mm |
25.31 km/h
(7.03 m/s)
|
7.57 J | |
| 50 mm |
31.49 km/h
(8.75 m/s)
|
11.72 J | |
| 100 mm |
44.16 km/h
(12.27 m/s)
|
23.04 J |
Table 9: Anti-corrosion coating durability
MP 62x42x25 / 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 62x42x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 100 906 Mx | 1009.1 µWb |
| Pc Coefficient | 0.64 | High (Stable) |
Table 11: Submerged application
MP 62x42x25 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 58.67 kg | Standard |
| Water (riverbed) |
67.18 kg
(+8.51 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet retains just a fraction of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Power loss vs temp
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.64
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Advantages as well as disadvantages of rare earth magnets.
Strengths
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They feature excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- 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...
- Thanks to freedom in forming and the capacity to customize to unusual requirements,
- Versatile presence in future technologies – they find application in hard drives, motor assemblies, advanced medical instruments, and industrial machines.
- 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 using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
- Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price is relatively high,
Lifting parameters
Highest magnetic holding force – what it depends on?
- with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
- whose thickness is min. 10 mm
- characterized by lack of roughness
- without the slightest clearance between the magnet and steel
- under perpendicular force vector (90-degree angle)
- at temperature room level
Determinants of lifting force in real conditions
- Distance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Pull-off angle – remember 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.
- Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be wasted to the other side.
- Material type – the best choice is pure iron steel. Stainless steels may attract less.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Thermal environment – heating the magnet results in weakening of force. Check the thermal limit for a given model.
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Beware of splinters
NdFeB magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets leads to them shattering into small pieces.
Respect the power
Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Mechanical processing
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Product not for children
Adult use only. Tiny parts pose a choking risk, causing serious injuries. Store out of reach of kids and pets.
Phone sensors
An intense magnetic field interferes with the operation of magnetometers in phones and navigation systems. Maintain magnets close to a device to prevent breaking the sensors.
Heat sensitivity
Keep cool. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Cards and drives
Avoid bringing magnets near a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.
Health Danger
People with a heart stimulator have to maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.
Hand protection
Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
Sensitization to coating
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact or opt for versions in plastic housing.
