MP 60x20x5 / N38 - ring magnet
ring magnet
Catalog no 030204
GTIN/EAN: 5906301812210
Diameter
60 mm [±0,1 mm]
internal diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
94.25 g
Magnetization Direction
↑ axial
Load capacity
9.41 kg / 92.27 N
Magnetic Induction
101.92 mT / 1019 Gs
Coating
[NiCuNi] Nickel
47.99 ZŁ with VAT / pcs + price for transport
39.02 ZŁ net + 23% VAT / pcs
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Technical of the product - MP 60x20x5 / N38 - ring magnet
Specification / characteristics - MP 60x20x5 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030204 |
| GTIN/EAN | 5906301812210 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 60 mm [±0,1 mm] |
| internal diameter Ø | 20 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 94.25 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 9.41 kg / 92.27 N |
| Magnetic Induction ~ ? | 101.92 mT / 1019 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 values are the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
MP 60x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4541 Gs
454.1 mT
|
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
warning |
| 1 mm |
4400 Gs
440.0 mT
|
8.83 kg / 19.47 lbs
8832.4 g / 86.6 N
|
warning |
| 2 mm |
4254 Gs
425.4 mT
|
8.26 kg / 18.21 lbs
8258.2 g / 81.0 N
|
warning |
| 3 mm |
4107 Gs
410.7 mT
|
7.70 kg / 16.97 lbs
7697.5 g / 75.5 N
|
warning |
| 5 mm |
3812 Gs
381.2 mT
|
6.63 kg / 14.62 lbs
6630.0 g / 65.0 N
|
warning |
| 10 mm |
3097 Gs
309.7 mT
|
4.38 kg / 9.65 lbs
4375.1 g / 42.9 N
|
warning |
| 15 mm |
2463 Gs
246.3 mT
|
2.77 kg / 6.10 lbs
2767.8 g / 27.2 N
|
warning |
| 20 mm |
1939 Gs
193.9 mT
|
1.72 kg / 3.78 lbs
1715.2 g / 16.8 N
|
weak grip |
| 30 mm |
1202 Gs
120.2 mT
|
0.66 kg / 1.45 lbs
659.2 g / 6.5 N
|
weak grip |
| 50 mm |
509 Gs
50.9 mT
|
0.12 kg / 0.26 lbs
118.0 g / 1.2 N
|
weak grip |
Table 2: Sliding hold (vertical surface)
MP 60x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.88 kg / 4.15 lbs
1882.0 g / 18.5 N
|
| 1 mm | Stal (~0.2) |
1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
|
| 2 mm | Stal (~0.2) |
1.65 kg / 3.64 lbs
1652.0 g / 16.2 N
|
| 3 mm | Stal (~0.2) |
1.54 kg / 3.40 lbs
1540.0 g / 15.1 N
|
| 5 mm | Stal (~0.2) |
1.33 kg / 2.92 lbs
1326.0 g / 13.0 N
|
| 10 mm | Stal (~0.2) |
0.88 kg / 1.93 lbs
876.0 g / 8.6 N
|
| 15 mm | Stal (~0.2) |
0.55 kg / 1.22 lbs
554.0 g / 5.4 N
|
| 20 mm | Stal (~0.2) |
0.34 kg / 0.76 lbs
344.0 g / 3.4 N
|
| 30 mm | Stal (~0.2) |
0.13 kg / 0.29 lbs
132.0 g / 1.3 N
|
| 50 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
24.0 g / 0.2 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MP 60x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.82 kg / 6.22 lbs
2823.0 g / 27.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.88 kg / 4.15 lbs
1882.0 g / 18.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.94 kg / 2.07 lbs
941.0 g / 9.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
4.71 kg / 10.37 lbs
4705.0 g / 46.2 N
|
Table 4: Steel thickness (substrate influence) - power losses
MP 60x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.94 kg / 2.07 lbs
941.0 g / 9.2 N
|
| 1 mm |
|
2.35 kg / 5.19 lbs
2352.5 g / 23.1 N
|
| 2 mm |
|
4.71 kg / 10.37 lbs
4705.0 g / 46.2 N
|
| 3 mm |
|
7.06 kg / 15.56 lbs
7057.5 g / 69.2 N
|
| 5 mm |
|
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
| 10 mm |
|
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
| 11 mm |
|
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
| 12 mm |
|
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
Table 5: Working in heat (stability) - resistance threshold
MP 60x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
9.41 kg / 20.75 lbs
9410.0 g / 92.3 N
|
OK |
| 40 °C | -2.2% |
9.20 kg / 20.29 lbs
9203.0 g / 90.3 N
|
OK |
| 60 °C | -4.4% |
9.00 kg / 19.83 lbs
8996.0 g / 88.3 N
|
OK |
| 80 °C | -6.6% |
8.79 kg / 19.38 lbs
8788.9 g / 86.2 N
|
|
| 100 °C | -28.8% |
6.70 kg / 14.77 lbs
6699.9 g / 65.7 N
|
Table 6: Two magnets (repulsion) - field collision
MP 60x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
303.46 kg / 669.01 lbs
5 621 Gs
|
45.52 kg / 100.35 lbs
45519 g / 446.5 N
|
N/A |
| 1 mm |
294.21 kg / 648.62 lbs
8 943 Gs
|
44.13 kg / 97.29 lbs
44132 g / 432.9 N
|
264.79 kg / 583.76 lbs
~0 Gs
|
| 2 mm |
284.83 kg / 627.94 lbs
8 800 Gs
|
42.72 kg / 94.19 lbs
42725 g / 419.1 N
|
256.35 kg / 565.15 lbs
~0 Gs
|
| 3 mm |
275.53 kg / 607.43 lbs
8 655 Gs
|
41.33 kg / 91.11 lbs
41329 g / 405.4 N
|
247.97 kg / 546.69 lbs
~0 Gs
|
| 5 mm |
257.21 kg / 567.06 lbs
8 362 Gs
|
38.58 kg / 85.06 lbs
38582 g / 378.5 N
|
231.49 kg / 510.35 lbs
~0 Gs
|
| 10 mm |
213.81 kg / 471.36 lbs
7 624 Gs
|
32.07 kg / 70.70 lbs
32071 g / 314.6 N
|
192.43 kg / 424.23 lbs
~0 Gs
|
| 20 mm |
141.09 kg / 311.05 lbs
6 193 Gs
|
21.16 kg / 46.66 lbs
21164 g / 207.6 N
|
126.98 kg / 279.95 lbs
~0 Gs
|
| 50 mm |
34.15 kg / 75.30 lbs
3 047 Gs
|
5.12 kg / 11.29 lbs
5123 g / 50.3 N
|
30.74 kg / 67.77 lbs
~0 Gs
|
| 60 mm |
21.26 kg / 46.87 lbs
2 404 Gs
|
3.19 kg / 7.03 lbs
3189 g / 31.3 N
|
19.13 kg / 42.18 lbs
~0 Gs
|
| 70 mm |
13.43 kg / 29.61 lbs
1 911 Gs
|
2.01 kg / 4.44 lbs
2015 g / 19.8 N
|
12.09 kg / 26.65 lbs
~0 Gs
|
| 80 mm |
8.65 kg / 19.06 lbs
1 533 Gs
|
1.30 kg / 2.86 lbs
1297 g / 12.7 N
|
7.78 kg / 17.16 lbs
~0 Gs
|
| 90 mm |
5.68 kg / 12.52 lbs
1 243 Gs
|
0.85 kg / 1.88 lbs
852 g / 8.4 N
|
5.11 kg / 11.27 lbs
~0 Gs
|
| 100 mm |
3.81 kg / 8.39 lbs
1 017 Gs
|
0.57 kg / 1.26 lbs
571 g / 5.6 N
|
3.43 kg / 7.55 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MP 60x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 31.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 24.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 19.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 15.0 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: Collisions (cracking risk) - warning
MP 60x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
12.67 km/h
(3.52 m/s)
|
0.58 J | |
| 30 mm |
18.20 km/h
(5.06 m/s)
|
1.20 J | |
| 50 mm |
22.71 km/h
(6.31 m/s)
|
1.88 J | |
| 100 mm |
31.88 km/h
(8.85 m/s)
|
3.70 J |
Table 9: Anti-corrosion coating durability
MP 60x20x5 / 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 60x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 109 640 Mx | 1096.4 µWb |
| Pc Coefficient | 0.62 | High (Stable) |
Table 11: Submerged application
MP 60x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 9.41 kg | Standard |
| Water (riverbed) |
10.77 kg
(+1.36 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*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) = 0.62
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
- They have excellent resistance to magnetic field loss when exposed to external fields,
- A magnet with a shiny nickel surface has an effective appearance,
- Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
- In view of the potential of flexible molding and adaptation to specialized projects, magnetic components can be produced in a variety of forms and dimensions, which amplifies use scope,
- Wide application in future technologies – they are used in magnetic memories, electric drive systems, medical equipment, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices
Weaknesses
- 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
- Neodymium magnets decrease their strength 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 magnets in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic mount.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
- Due to neodymium price, their price exceeds standard values,
Pull force analysis
Maximum lifting capacity of the magnet – what affects it?
- using a base made of high-permeability steel, serving as a ideal flux conductor
- whose transverse dimension equals approx. 10 mm
- with a surface free of scratches
- under conditions of gap-free contact (surface-to-surface)
- under perpendicular force direction (90-degree angle)
- at temperature room level
Lifting capacity in real conditions – factors
- Distance (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
- Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.
Warnings
Do not drill into magnets
Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.
Precision electronics
A powerful magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to prevent breaking the sensors.
Magnet fragility
NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.
Avoid contact if allergic
Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or opt for versions in plastic housing.
Finger safety
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Permanent damage
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Cards and drives
Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.
Product not for children
These products are not suitable for play. Eating a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.
Safe operation
Use magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their force.
Pacemakers
People with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.
