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.
Contact us by phone
+48 22 499 98 98
otherwise drop us a message using
contact form
through our site.
Weight and form of a neodymium magnet can be checked using our
our magnetic calculator.
Orders submitted before 14:00 will be dispatched today!
Technical 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 modeling of the magnet - technical parameters
The following values represent the outcome of a mathematical calculation. Values were calculated on models for the class Nd2Fe14B. Real-world parameters may differ. Use these data as a supplementary guide during assembly planning.
Table 1: Static pull 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
|
low risk |
| 1 mm |
3295 Gs
329.5 mT
|
0.29 kg / 0.63 LBS
287.5 g / 2.8 N
|
low risk |
| 2 mm |
1883 Gs
188.3 mT
|
0.09 kg / 0.21 LBS
93.9 g / 0.9 N
|
low risk |
| 3 mm |
1098 Gs
109.8 mT
|
0.03 kg / 0.07 LBS
31.9 g / 0.3 N
|
low risk |
| 5 mm |
440 Gs
44.0 mT
|
0.01 kg / 0.01 LBS
5.1 g / 0.1 N
|
low risk |
| 10 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 15 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
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) - behavior on slippery surfaces
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 (saturation) - power losses
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: Magnet-Magnet interaction (attraction) - field collision
MP 5x2.7/1.2x5 C / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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: Hazards (electronics) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 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: Impact energy (kinetic energy) - warning
MP 5x2.7/1.2x5 C / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.76 km/h
(4.65 m/s)
|
0.01 J | |
| 30 mm |
16.76 km/h
(4.66 m/s)
|
0.01 J | |
| 50 mm |
16.76 km/h
(4.66 m/s)
|
0.01 J | |
| 100 mm |
16.76 km/h
(4.66 m/s)
|
0.01 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: Construction 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. Sliding resistance
*Caution: On a vertical surface, the magnet retains just a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) severely limits the holding force.
3. Power loss vs temp
*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) = 0.83
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also offers
Pros and cons of neodymium magnets.
Advantages
- They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
- They do not lose their magnetic properties even under close interference source,
- In other words, due to the shiny layer of gold, the element gains visual value,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- In view of the ability of precise forming and customization to specialized projects, magnetic components can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
- Fundamental importance in future technologies – they are commonly used in magnetic memories, electric motors, medical devices, and complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions
Disadvantages
- At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Due to limitations in creating nuts and complex forms in magnets, we propose using a housing - magnetic mount.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these devices can be problematic in diagnostics medical in case of swallowing.
- Due to expensive raw materials, their price exceeds standard values,
Pull force analysis
Detachment force of the magnet in optimal conditions – what it depends on?
- with the use of a yoke made of special test steel, ensuring maximum field concentration
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with a plane cleaned and smooth
- with total lack of distance (no impurities)
- during detachment in a direction vertical to the plane
- in temp. approx. 20°C
Determinants of lifting force in real conditions
- Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
- Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
- Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.
H&S for magnets
Magnets are brittle
Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Adults only
These products are not toys. Swallowing several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Serious injuries
Danger of trauma: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.
Fire warning
Powder produced during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Heat warning
Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).
Handling guide
Handle magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their power.
Warning for allergy sufferers
Some people suffer from a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact might lead to dermatitis. We strongly advise use safety gloves.
Danger to pacemakers
Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.
Electronic hazard
Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).
Precision electronics
GPS units and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
