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 |
Engineering simulation of the assembly - report
The following information are the direct effect of a physical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Actual conditions may differ. Please consider these calculations as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - power drop
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
|
safe |
| 30 mm |
1202 Gs
120.2 mT
|
0.66 kg / 1.45 LBS
659.2 g / 6.5 N
|
safe |
| 50 mm |
509 Gs
50.9 mT
|
0.12 kg / 0.26 LBS
118.0 g / 1.2 N
|
safe |
Table 2: Shear load (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: Wall mounting (sliding) - behavior on slippery surfaces
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: Material efficiency (saturation) - 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: Thermal resistance (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 (attraction) - forces in the system
MP 60x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Protective zones (electronics) - warnings
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 |
| Timepiece | 20 Gs (2.0 mT) | 19.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 15.0 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: Collisions (cracking risk) - collision effects
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: Corrosion resistance
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: Construction data (Pc)
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. Wall mount (shear)
*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Heat tolerance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.62
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 |
View also proposals
Strengths and weaknesses of rare earth magnets.
Advantages
- They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets are extremely resistant to demagnetization caused by external magnetic fields,
- Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver gives an modern appearance,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to freedom in designing and the ability to modify to specific needs,
- Versatile presence in future technologies – they find application in HDD drives, electric motors, medical equipment, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions
Disadvantages
- To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price exceeds standard values,
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- using a plate made of high-permeability steel, functioning as a ideal flux conductor
- whose transverse dimension reaches at least 10 mm
- characterized by even structure
- with direct contact (no impurities)
- under vertical force vector (90-degree angle)
- at standard ambient temperature
Impact of factors on magnetic holding capacity in practice
- Air gap (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
- Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
- Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
Allergy Warning
Certain individuals experience a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause dermatitis. We suggest wear safety gloves.
GPS Danger
GPS units and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can ruin the internal compass in your phone.
Conscious usage
Exercise caution. Neodymium magnets attract from a distance and snap with huge force, often faster than you can move away.
Warning for heart patients
Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Do not drill into magnets
Dust generated during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Heat sensitivity
Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.
Hand protection
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!
Keep away from children
Neodymium magnets are not suitable for play. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.
Threat to electronics
Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Beware of splinters
NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them cracking into small pieces.
