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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Detailed specification - 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 |
Physical simulation of the assembly - report
These values constitute the outcome of a physical analysis. Values rely on models for the material Nd2Fe14B. Real-world performance may differ. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - characteristics
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 lbs
58670.0 g / 575.6 N
|
dangerous! |
| 1 mm |
4338 Gs
433.8 mT
|
55.21 kg / 121.72 lbs
55213.2 g / 541.6 N
|
dangerous! |
| 2 mm |
4201 Gs
420.1 mT
|
51.77 kg / 114.13 lbs
51768.5 g / 507.8 N
|
dangerous! |
| 3 mm |
4061 Gs
406.1 mT
|
48.39 kg / 106.69 lbs
48394.9 g / 474.8 N
|
dangerous! |
| 5 mm |
3781 Gs
378.1 mT
|
41.94 kg / 92.47 lbs
41942.4 g / 411.5 N
|
dangerous! |
| 10 mm |
3097 Gs
309.7 mT
|
28.15 kg / 62.06 lbs
28148.0 g / 276.1 N
|
dangerous! |
| 15 mm |
2485 Gs
248.5 mT
|
18.12 kg / 39.94 lbs
18118.5 g / 177.7 N
|
dangerous! |
| 20 mm |
1972 Gs
197.2 mT
|
11.41 kg / 25.16 lbs
11412.7 g / 112.0 N
|
dangerous! |
| 30 mm |
1239 Gs
123.9 mT
|
4.51 kg / 9.93 lbs
4505.2 g / 44.2 N
|
medium risk |
| 50 mm |
533 Gs
53.3 mT
|
0.83 kg / 1.84 lbs
832.4 g / 8.2 N
|
weak grip |
Table 2: Shear force (wall)
MP 62x42x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
11.73 kg / 25.87 lbs
11734.0 g / 115.1 N
|
| 1 mm | Stal (~0.2) |
11.04 kg / 24.34 lbs
11042.0 g / 108.3 N
|
| 2 mm | Stal (~0.2) |
10.35 kg / 22.83 lbs
10354.0 g / 101.6 N
|
| 3 mm | Stal (~0.2) |
9.68 kg / 21.34 lbs
9678.0 g / 94.9 N
|
| 5 mm | Stal (~0.2) |
8.39 kg / 18.49 lbs
8388.0 g / 82.3 N
|
| 10 mm | Stal (~0.2) |
5.63 kg / 12.41 lbs
5630.0 g / 55.2 N
|
| 15 mm | Stal (~0.2) |
3.62 kg / 7.99 lbs
3624.0 g / 35.6 N
|
| 20 mm | Stal (~0.2) |
2.28 kg / 5.03 lbs
2282.0 g / 22.4 N
|
| 30 mm | Stal (~0.2) |
0.90 kg / 1.99 lbs
902.0 g / 8.8 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 0.37 lbs
166.0 g / 1.6 N
|
Table 3: Vertical assembly (shearing) - vertical pull
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 lbs
17601.0 g / 172.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
11.73 kg / 25.87 lbs
11734.0 g / 115.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
5.87 kg / 12.93 lbs
5867.0 g / 57.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
29.34 kg / 64.67 lbs
29335.0 g / 287.8 N
|
Table 4: Material efficiency (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 lbs
1955.7 g / 19.2 N
|
| 1 mm |
|
4.89 kg / 10.78 lbs
4889.2 g / 48.0 N
|
| 2 mm |
|
9.78 kg / 21.56 lbs
9778.3 g / 95.9 N
|
| 3 mm |
|
14.67 kg / 32.34 lbs
14667.5 g / 143.9 N
|
| 5 mm |
|
24.45 kg / 53.89 lbs
24445.8 g / 239.8 N
|
| 10 mm |
|
48.89 kg / 107.79 lbs
48891.7 g / 479.6 N
|
| 11 mm |
|
53.78 kg / 118.57 lbs
53780.8 g / 527.6 N
|
| 12 mm |
|
58.67 kg / 129.35 lbs
58670.0 g / 575.6 N
|
Table 5: Thermal resistance (stability) - thermal limit
MP 62x42x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
58.67 kg / 129.35 lbs
58670.0 g / 575.6 N
|
OK |
| 40 °C | -2.2% |
57.38 kg / 126.50 lbs
57379.3 g / 562.9 N
|
OK |
| 60 °C | -4.4% |
56.09 kg / 123.65 lbs
56088.5 g / 550.2 N
|
OK |
| 80 °C | -6.6% |
54.80 kg / 120.81 lbs
54797.8 g / 537.6 N
|
|
| 100 °C | -28.8% |
41.77 kg / 92.09 lbs
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) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
264.93 kg / 584.07 lbs
5 588 Gs
|
39.74 kg / 87.61 lbs
39740 g / 389.8 N
|
N/A |
| 1 mm |
257.19 kg / 567.00 lbs
8 812 Gs
|
38.58 kg / 85.05 lbs
38578 g / 378.4 N
|
231.47 kg / 510.30 lbs
~0 Gs
|
| 2 mm |
249.32 kg / 549.66 lbs
8 676 Gs
|
37.40 kg / 82.45 lbs
37398 g / 366.9 N
|
224.39 kg / 494.69 lbs
~0 Gs
|
| 3 mm |
241.51 kg / 532.44 lbs
8 539 Gs
|
36.23 kg / 79.87 lbs
36227 g / 355.4 N
|
217.36 kg / 479.19 lbs
~0 Gs
|
| 5 mm |
226.10 kg / 498.47 lbs
8 262 Gs
|
33.92 kg / 74.77 lbs
33915 g / 332.7 N
|
203.49 kg / 448.62 lbs
~0 Gs
|
| 10 mm |
189.40 kg / 417.55 lbs
7 562 Gs
|
28.41 kg / 62.63 lbs
28409 g / 278.7 N
|
170.46 kg / 375.79 lbs
~0 Gs
|
| 20 mm |
127.11 kg / 280.22 lbs
6 195 Gs
|
19.07 kg / 42.03 lbs
19066 g / 187.0 N
|
114.40 kg / 252.20 lbs
~0 Gs
|
| 50 mm |
32.28 kg / 71.17 lbs
3 122 Gs
|
4.84 kg / 10.68 lbs
4843 g / 47.5 N
|
29.06 kg / 64.06 lbs
~0 Gs
|
| 60 mm |
20.34 kg / 44.85 lbs
2 478 Gs
|
3.05 kg / 6.73 lbs
3052 g / 29.9 N
|
18.31 kg / 40.36 lbs
~0 Gs
|
| 70 mm |
12.99 kg / 28.63 lbs
1 980 Gs
|
1.95 kg / 4.29 lbs
1948 g / 19.1 N
|
11.69 kg / 25.77 lbs
~0 Gs
|
| 80 mm |
8.43 kg / 18.59 lbs
1 595 Gs
|
1.26 kg / 2.79 lbs
1265 g / 12.4 N
|
7.59 kg / 16.73 lbs
~0 Gs
|
| 90 mm |
5.58 kg / 12.29 lbs
1 298 Gs
|
0.84 kg / 1.84 lbs
836 g / 8.2 N
|
5.02 kg / 11.06 lbs
~0 Gs
|
| 100 mm |
3.76 kg / 8.29 lbs
1 065 Gs
|
0.56 kg / 1.24 lbs
564 g / 5.5 N
|
3.38 kg / 7.46 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
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 |
| Car key | 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 (kinetic energy) - warning
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: Electrical 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. Vertical hold
*Warning: On a vertical wall, the magnet holds merely a fraction of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Thermal stability
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.64
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 offers
Advantages and disadvantages of neodymium magnets.
Pros
- They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- They do not lose their magnetic properties even under external field action,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
- In view of the option of accurate molding and adaptation to unique solutions, magnetic components can be manufactured in a wide range of geometric configurations, which amplifies use scope,
- Universal use in future technologies – they find application in data components, electromotive mechanisms, medical devices, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in small systems
Cons
- At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices can be problematic in diagnostics medical when they are in the body.
- With mass production the cost of neodymium magnets is economically unviable,
Lifting parameters
Detachment force of the magnet in optimal conditions – what it depends on?
- using a sheet made of mild steel, functioning as a ideal flux conductor
- possessing a thickness of at least 10 mm to ensure full flux closure
- characterized by lack of roughness
- under conditions of gap-free contact (metal-to-metal)
- under axial application of breakaway force (90-degree angle)
- in stable room temperature
Lifting capacity in practice – influencing factors
- Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
- Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
Data carriers
Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).
Dust is flammable
Dust generated during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Bone fractures
Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Pacemakers
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Compass and GPS
A powerful magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.
Heat sensitivity
Avoid heat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Magnet fragility
Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.
Handling rules
Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.
Keep away from children
Adult use only. Small elements pose a choking risk, causing serious injuries. Store away from children and animals.
Sensitization to coating
It is widely known that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select versions in plastic housing.
