MP 5x1.5x3 / N38 - ring magnet
ring magnet
Catalog no 030451
GTIN/EAN: 5906301812357
Diameter
5 mm [±0,1 mm]
internal diameter Ø
1.5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.4 g
Magnetization Direction
↑ axial
Load capacity
0.77 kg / 7.50 N
Magnetic Induction
475.16 mT / 4752 Gs
Coating
[NiCuNi] Nickel
0.344 ZŁ with VAT / pcs + price for transport
0.280 ZŁ net + 23% VAT / pcs
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Technical details - MP 5x1.5x3 / N38 - ring magnet
Specification / characteristics - MP 5x1.5x3 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030451 |
| GTIN/EAN | 5906301812357 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 5 mm [±0,1 mm] |
| internal diameter Ø | 1.5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.4 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.77 kg / 7.50 N |
| Magnetic Induction ~ ? | 475.16 mT / 4752 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 - technical parameters
Presented values are the result of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational performance may differ. Use these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull vs distance) - characteristics
MP 5x1.5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6157 Gs
615.7 mT
|
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
safe |
| 1 mm |
3880 Gs
388.0 mT
|
0.31 kg / 0.67 LBS
305.8 g / 3.0 N
|
safe |
| 2 mm |
2310 Gs
231.0 mT
|
0.11 kg / 0.24 LBS
108.4 g / 1.1 N
|
safe |
| 3 mm |
1422 Gs
142.2 mT
|
0.04 kg / 0.09 LBS
41.0 g / 0.4 N
|
safe |
| 5 mm |
641 Gs
64.1 mT
|
0.01 kg / 0.02 LBS
8.3 g / 0.1 N
|
safe |
| 10 mm |
174 Gs
17.4 mT
|
0.00 kg / 0.00 LBS
0.6 g / 0.0 N
|
safe |
| 15 mm |
76 Gs
7.6 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
safe |
| 20 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 30 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage force (wall)
MP 5x1.5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.34 LBS
154.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.14 LBS
62.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
22.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
8.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 5x1.5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.23 kg / 0.51 LBS
231.0 g / 2.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.34 LBS
154.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 LBS
77.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.39 kg / 0.85 LBS
385.0 g / 3.8 N
|
Table 4: Steel thickness (substrate influence) - power losses
MP 5x1.5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.17 LBS
77.0 g / 0.8 N
|
| 1 mm |
|
0.19 kg / 0.42 LBS
192.5 g / 1.9 N
|
| 2 mm |
|
0.39 kg / 0.85 LBS
385.0 g / 3.8 N
|
| 3 mm |
|
0.58 kg / 1.27 LBS
577.5 g / 5.7 N
|
| 5 mm |
|
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
| 10 mm |
|
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
| 11 mm |
|
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
| 12 mm |
|
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
Table 5: Thermal stability (material behavior) - power drop
MP 5x1.5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.77 kg / 1.70 LBS
770.0 g / 7.6 N
|
OK |
| 40 °C | -2.2% |
0.75 kg / 1.66 LBS
753.1 g / 7.4 N
|
OK |
| 60 °C | -4.4% |
0.74 kg / 1.62 LBS
736.1 g / 7.2 N
|
OK |
| 80 °C | -6.6% |
0.72 kg / 1.59 LBS
719.2 g / 7.1 N
|
|
| 100 °C | -28.8% |
0.55 kg / 1.21 LBS
548.2 g / 5.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 5x1.5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.50 kg / 5.50 LBS
6 171 Gs
|
0.37 kg / 0.83 LBS
374 g / 3.7 N
|
N/A |
| 1 mm |
1.62 kg / 3.58 LBS
9 932 Gs
|
0.24 kg / 0.54 LBS
244 g / 2.4 N
|
1.46 kg / 3.22 LBS
~0 Gs
|
| 2 mm |
0.99 kg / 2.19 LBS
7 760 Gs
|
0.15 kg / 0.33 LBS
149 g / 1.5 N
|
0.89 kg / 1.97 LBS
~0 Gs
|
| 3 mm |
0.59 kg / 1.30 LBS
5 986 Gs
|
0.09 kg / 0.20 LBS
88 g / 0.9 N
|
0.53 kg / 1.17 LBS
~0 Gs
|
| 5 mm |
0.21 kg / 0.47 LBS
3 600 Gs
|
0.03 kg / 0.07 LBS
32 g / 0.3 N
|
0.19 kg / 0.42 LBS
~0 Gs
|
| 10 mm |
0.03 kg / 0.06 LBS
1 281 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
349 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
50 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
33 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 LBS
23 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
17 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
13 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
10 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (electronics) - precautionary measures
MP 5x1.5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MP 5x1.5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
44.27 km/h
(12.30 m/s)
|
0.03 J | |
| 30 mm |
76.64 km/h
(21.29 m/s)
|
0.09 J | |
| 50 mm |
98.94 km/h
(27.48 m/s)
|
0.15 J | |
| 100 mm |
139.93 km/h
(38.87 m/s)
|
0.30 J |
Table 9: Corrosion resistance
MP 5x1.5x3 / 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 5x1.5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 811 Mx | 8.1 µWb |
| Pc Coefficient | 1.66 | High (Stable) |
Table 11: Submerged application
MP 5x1.5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.77 kg | Standard |
| Water (riverbed) |
0.88 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.66
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of rare earth magnets.
Advantages
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They are noted for resistance to demagnetization induced by external field influence,
- The use of an refined layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Magnetic induction on the surface of the magnet remains strong,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Possibility of custom modeling and optimizing to concrete requirements,
- Huge importance in modern industrial fields – they are used in HDD drives, motor assemblies, medical equipment, as well as industrial machines.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- At strong impacts they can break, therefore we recommend 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 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 durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited ability of producing threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
- Health risk resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Magnetic strength at its maximum – what contributes to it?
- on a block made of structural steel, perfectly concentrating the magnetic flux
- possessing a massiveness of minimum 10 mm to avoid saturation
- with a surface perfectly flat
- with total lack of distance (no paint)
- during detachment in a direction perpendicular to the mounting surface
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
- Distance – the presence of any layer (rust, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin plate causes magnetic saturation, causing part of the power to be wasted to the other side.
- Plate material – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Warnings
Crushing force
Large magnets can smash fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.
Risk of cracking
Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.
Danger to pacemakers
Individuals with a pacemaker must maintain an large gap from magnets. The magnetism can disrupt the operation of the implant.
Thermal limits
Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
GPS Danger
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
Protect data
Do not bring magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.
This is not a toy
Always store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.
Immense force
Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and respect their force.
Machining danger
Powder created during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Skin irritation risks
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.
