MP 5x2.7/1.2x5 C / N38 - ring magnet
ring magnet
Catalog no 030201
GTIN/EAN: 5906301812180
Diameter
5 mm [±0,1 mm]
internal diameter Ø
2.7/1.2 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
0.69 g
Magnetization Direction
↑ axial
Load capacity
0.75 kg / 7.31 N
Magnetic Induction
553.14 mT / 5531 Gs
Coating
[NiCuNi] Nickel
0.836 ZŁ with VAT / pcs + price for transport
0.680 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical data of the product - MP 5x2.7/1.2x5 C / N38 - ring magnet
Specification / characteristics - MP 5x2.7/1.2x5 C / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030201 |
| GTIN/EAN | 5906301812180 |
| 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 | 2.7/1.2 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 0.69 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.75 kg / 7.31 N |
| Magnetic Induction ~ ? | 553.14 mT / 5531 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 |
Technical analysis of the magnet - data
Presented values represent the result of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point for designers.
Table 1: Static force (pull vs gap) - power drop
MP 5x2.7/1.2x5 C / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5322 Gs
532.2 mT
|
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
weak grip |
| 1 mm |
3295 Gs
329.5 mT
|
0.29 kg / 0.63 lbs
287.5 g / 2.8 N
|
weak grip |
| 2 mm |
1883 Gs
188.3 mT
|
0.09 kg / 0.21 lbs
93.9 g / 0.9 N
|
weak grip |
| 3 mm |
1098 Gs
109.8 mT
|
0.03 kg / 0.07 lbs
31.9 g / 0.3 N
|
weak grip |
| 5 mm |
440 Gs
44.0 mT
|
0.01 kg / 0.01 lbs
5.1 g / 0.1 N
|
weak grip |
| 10 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
weak grip |
| 15 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding force (vertical surface)
MP 5x2.7/1.2x5 C / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.13 lbs
58.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 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 (shearing) - vertical pull
MP 5x2.7/1.2x5 C / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.22 kg / 0.50 lbs
225.0 g / 2.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 lbs
75.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.38 kg / 0.83 lbs
375.0 g / 3.7 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 5x2.7/1.2x5 C / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.17 lbs
75.0 g / 0.7 N
|
| 1 mm |
|
0.19 kg / 0.41 lbs
187.5 g / 1.8 N
|
| 2 mm |
|
0.38 kg / 0.83 lbs
375.0 g / 3.7 N
|
| 3 mm |
|
0.56 kg / 1.24 lbs
562.5 g / 5.5 N
|
| 5 mm |
|
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
| 10 mm |
|
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
| 11 mm |
|
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
| 12 mm |
|
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
Table 5: Working in heat (material behavior) - power drop
MP 5x2.7/1.2x5 C / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.75 kg / 1.65 lbs
750.0 g / 7.4 N
|
OK |
| 40 °C | -2.2% |
0.73 kg / 1.62 lbs
733.5 g / 7.2 N
|
OK |
| 60 °C | -4.4% |
0.72 kg / 1.58 lbs
717.0 g / 7.0 N
|
OK |
| 80 °C | -6.6% |
0.70 kg / 1.54 lbs
700.5 g / 6.9 N
|
|
| 100 °C | -28.8% |
0.53 kg / 1.18 lbs
534.0 g / 5.2 N
|
Table 6: Two magnets (attraction) - field range
MP 5x2.7/1.2x5 C / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.75 kg / 6.06 lbs
5 924 Gs
|
0.41 kg / 0.91 lbs
412 g / 4.0 N
|
N/A |
| 1 mm |
1.77 kg / 3.90 lbs
8 541 Gs
|
0.27 kg / 0.58 lbs
265 g / 2.6 N
|
1.59 kg / 3.51 lbs
~0 Gs
|
| 2 mm |
1.05 kg / 2.32 lbs
6 590 Gs
|
0.16 kg / 0.35 lbs
158 g / 1.5 N
|
0.95 kg / 2.09 lbs
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 lbs
4 992 Gs
|
0.09 kg / 0.20 lbs
91 g / 0.9 N
|
0.54 kg / 1.20 lbs
~0 Gs
|
| 5 mm |
0.20 kg / 0.44 lbs
2 860 Gs
|
0.03 kg / 0.07 lbs
30 g / 0.3 N
|
0.18 kg / 0.39 lbs
~0 Gs
|
| 10 mm |
0.02 kg / 0.04 lbs
880 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.04 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 lbs
184 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
16 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
10 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
6 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
4 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
3 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
2 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MP 5x2.7/1.2x5 C / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.5 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Collisions (kinetic energy) - warning
MP 5x2.7/1.2x5 C / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
33.26 km/h
(9.24 m/s)
|
0.03 J | |
| 30 mm |
57.59 km/h
(16.00 m/s)
|
0.09 J | |
| 50 mm |
74.35 km/h
(20.65 m/s)
|
0.15 J | |
| 100 mm |
105.14 km/h
(29.21 m/s)
|
0.29 J |
Table 9: Anti-corrosion coating durability
MP 5x2.7/1.2x5 C / 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 (Pc)
MP 5x2.7/1.2x5 C / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 862 Mx | 8.6 µWb |
| Pc Coefficient | 0.83 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MP 5x2.7/1.2x5 C / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.75 kg | Standard |
| Water (riverbed) |
0.86 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.83
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.
Material specification
| 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 |
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Strengths as well as weaknesses of rare earth magnets.
Strengths
- They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
- Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
- A magnet with a shiny gold surface is more attractive,
- Magnets have impressive magnetic induction on the outer layer,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to modularity in shaping and the ability to adapt to individual projects,
- Huge importance in modern industrial fields – they find application in HDD drives, motor assemblies, advanced medical instruments, also other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- using a plate made of mild steel, functioning as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- characterized by lack of roughness
- with direct contact (no paint)
- during detachment in a direction vertical to the mounting surface
- in neutral thermal conditions
What influences lifting capacity in practice
- Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
- Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.
Precautions when working with neodymium magnets
Impact on smartphones
Note: rare earth magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.
Fire warning
Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.
Health Danger
For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to handle the magnets.
Electronic devices
Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Do not give to children
Only for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of kids and pets.
Risk of cracking
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Immense force
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Nickel allergy
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact or choose encased magnets.
Demagnetization risk
Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.
Bodily injuries
Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
