MP 12x5x2 / N38 - ring magnet
ring magnet
Catalog no 030498
Diameter
12 mm [±0,1 mm]
internal diameter Ø
5 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
1.4 g
Magnetization Direction
↑ axial
Load capacity
1.15 kg / 11.29 N
Magnetic Induction
195.97 mT / 1960 Gs
Coating
[NiCuNi] Nickel
1.230 ZŁ with VAT / pcs + price for transport
1.000 ZŁ net + 23% VAT / pcs
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Technical of the product - MP 12x5x2 / N38 - ring magnet
Specification / characteristics - MP 12x5x2 / N38 - ring magnet
| properties | values |
|---|---|
| Cat. no. | 030498 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 12 mm [±0,1 mm] |
| internal diameter Ø | 5 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 1.4 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.15 kg / 11.29 N |
| Magnetic Induction ~ ? | 195.97 mT / 1960 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 simulation of the assembly - report
These information are the direct effect of a physical simulation. Values rely on algorithms for the material Nd2Fe14B. Operational conditions may differ. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs distance) - power drop
MP 12x5x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6085 Gs
608.5 mT
|
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
weak grip |
| 1 mm |
5082 Gs
508.2 mT
|
0.80 kg / 1.77 LBS
802.2 g / 7.9 N
|
weak grip |
| 2 mm |
4147 Gs
414.7 mT
|
0.53 kg / 1.18 LBS
534.0 g / 5.2 N
|
weak grip |
| 3 mm |
3340 Gs
334.0 mT
|
0.35 kg / 0.76 LBS
346.3 g / 3.4 N
|
weak grip |
| 5 mm |
2152 Gs
215.2 mT
|
0.14 kg / 0.32 LBS
143.8 g / 1.4 N
|
weak grip |
| 10 mm |
822 Gs
82.2 mT
|
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
|
weak grip |
| 15 mm |
394 Gs
39.4 mT
|
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
|
weak grip |
| 20 mm |
221 Gs
22.1 mT
|
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
|
weak grip |
| 30 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
weak grip |
| 50 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (wall)
MP 12x5x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.23 kg / 0.51 LBS
230.0 g / 2.3 N
|
| 1 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
160.0 g / 1.6 N
|
| 2 mm | Stal (~0.2) |
0.11 kg / 0.23 LBS
106.0 g / 1.0 N
|
| 3 mm | Stal (~0.2) |
0.07 kg / 0.15 LBS
70.0 g / 0.7 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.06 LBS
28.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 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 12x5x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.35 kg / 0.76 LBS
345.0 g / 3.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.23 kg / 0.51 LBS
230.0 g / 2.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.11 kg / 0.25 LBS
115.0 g / 1.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.58 kg / 1.27 LBS
575.0 g / 5.6 N
|
Table 4: Material efficiency (substrate influence) - power losses
MP 12x5x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.11 kg / 0.25 LBS
115.0 g / 1.1 N
|
| 1 mm |
|
0.29 kg / 0.63 LBS
287.5 g / 2.8 N
|
| 2 mm |
|
0.58 kg / 1.27 LBS
575.0 g / 5.6 N
|
| 3 mm |
|
0.86 kg / 1.90 LBS
862.5 g / 8.5 N
|
| 5 mm |
|
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
| 10 mm |
|
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
| 11 mm |
|
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
| 12 mm |
|
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
Table 5: Thermal resistance (material behavior) - power drop
MP 12x5x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.15 kg / 2.54 LBS
1150.0 g / 11.3 N
|
OK |
| 40 °C | -2.2% |
1.12 kg / 2.48 LBS
1124.7 g / 11.0 N
|
OK |
| 60 °C | -4.4% |
1.10 kg / 2.42 LBS
1099.4 g / 10.8 N
|
OK |
| 80 °C | -6.6% |
1.07 kg / 2.37 LBS
1074.1 g / 10.5 N
|
|
| 100 °C | -28.8% |
0.82 kg / 1.81 LBS
818.8 g / 8.0 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MP 12x5x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
21.34 kg / 47.04 LBS
6 163 Gs
|
3.20 kg / 7.06 LBS
3201 g / 31.4 N
|
N/A |
| 1 mm |
17.97 kg / 39.61 LBS
11 168 Gs
|
2.69 kg / 5.94 LBS
2695 g / 26.4 N
|
16.17 kg / 35.65 LBS
~0 Gs
|
| 2 mm |
14.88 kg / 32.81 LBS
10 165 Gs
|
2.23 kg / 4.92 LBS
2233 g / 21.9 N
|
13.40 kg / 29.53 LBS
~0 Gs
|
| 3 mm |
12.20 kg / 26.89 LBS
9 202 Gs
|
1.83 kg / 4.03 LBS
1830 g / 17.9 N
|
10.98 kg / 24.20 LBS
~0 Gs
|
| 5 mm |
8.00 kg / 17.63 LBS
7 450 Gs
|
1.20 kg / 2.64 LBS
1199 g / 11.8 N
|
7.20 kg / 15.87 LBS
~0 Gs
|
| 10 mm |
2.67 kg / 5.88 LBS
4 304 Gs
|
0.40 kg / 0.88 LBS
400 g / 3.9 N
|
2.40 kg / 5.30 LBS
~0 Gs
|
| 20 mm |
0.39 kg / 0.86 LBS
1 644 Gs
|
0.06 kg / 0.13 LBS
58 g / 0.6 N
|
0.35 kg / 0.77 LBS
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 LBS
275 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.02 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.01 LBS
184 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 LBS
129 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
95 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
72 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
56 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MP 12x5x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 10.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 6.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.5 cm |
| Car key | 50 Gs (5.0 mT) | 4.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (cracking risk) - warning
MP 12x5x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.23 km/h
(8.12 m/s)
|
0.05 J | |
| 30 mm |
50.07 km/h
(13.91 m/s)
|
0.14 J | |
| 50 mm |
64.63 km/h
(17.95 m/s)
|
0.23 J | |
| 100 mm |
91.40 km/h
(25.39 m/s)
|
0.45 J |
Table 9: Coating parameters (durability)
MP 12x5x2 / 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 12x5x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 503 Mx | 65.0 µWb |
| Pc Coefficient | 1.34 | High (Stable) |
Table 11: Submerged application
MP 12x5x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.15 kg | Standard |
| Water (riverbed) |
1.32 kg
(+0.17 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely reduces 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) = 1.34
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 and weaknesses of Nd2Fe14B magnets.
Advantages
- Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (according to research),
- They retain their magnetic properties even under external field action,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
- Magnets are distinguished by exceptionally strong magnetic induction on the outer side,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- In view of the ability of accurate forming and adaptation to unique projects, NdFeB magnets can be modeled in a variety of forms and dimensions, which amplifies use scope,
- Wide application in modern technologies – they are used in mass storage devices, brushless drives, advanced medical instruments, and modern systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of producing nuts in the magnet and complex forms - recommended is cover - mounting mechanism.
- Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these devices are able to complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities
Pull force analysis
Magnetic strength at its maximum – what affects it?
- on a block made of structural steel, effectively closing the magnetic field
- whose thickness equals approx. 10 mm
- characterized by lack of roughness
- under conditions of no distance (surface-to-surface)
- during pulling in a direction perpendicular to the mounting surface
- at room temperature
Magnet lifting force in use – key factors
- Gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be lost to the other side.
- Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
- Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate decreases the holding force.
Precautions when working with NdFeB magnets
ICD Warning
People with a pacemaker should maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.
Powerful field
Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.
Threat to electronics
Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
Do not overheat magnets
Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and strength.
Nickel allergy
Certain individuals have a sensitization to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact can result in a rash. We suggest wear protective gloves.
Dust explosion hazard
Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Serious injuries
Big blocks can crush fingers instantly. Never put your hand betwixt two strong magnets.
Swallowing risk
These products are not intended for children. Swallowing a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires immediate surgery.
Compass and GPS
Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.
