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 |
Engineering simulation of the assembly - report
These values represent the direct effect of a engineering analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these data as a supplementary guide during assembly planning.
Table 1: Static pull force (pull vs gap) - characteristics
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
|
safe |
| 1 mm |
5082 Gs
508.2 mT
|
0.80 kg / 1.77 LBS
802.2 g / 7.9 N
|
safe |
| 2 mm |
4147 Gs
414.7 mT
|
0.53 kg / 1.18 LBS
534.0 g / 5.2 N
|
safe |
| 3 mm |
3340 Gs
334.0 mT
|
0.35 kg / 0.76 LBS
346.3 g / 3.4 N
|
safe |
| 5 mm |
2152 Gs
215.2 mT
|
0.14 kg / 0.32 LBS
143.8 g / 1.4 N
|
safe |
| 10 mm |
822 Gs
82.2 mT
|
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
|
safe |
| 15 mm |
394 Gs
39.4 mT
|
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
|
safe |
| 20 mm |
221 Gs
22.1 mT
|
0.00 kg / 0.00 LBS
1.5 g / 0.0 N
|
safe |
| 30 mm |
92 Gs
9.2 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
safe |
| 50 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Shear capacity (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 (shearing) - vertical pull
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: Steel thickness (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 (stability) - thermal limit
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 collision
MP 12x5x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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: Safety (HSE) (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 |
| Timepiece | 20 Gs (2.0 mT) | 6.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.5 cm |
| Remote | 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: Impact energy (kinetic energy) - collision effects
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: Surface protection spec
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 (Pc)
MP 12x5x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 503 Mx | 65.0 µWb |
| Pc Coefficient | 1.34 | High (Stable) |
Table 11: Underwater work (magnet fishing)
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. Shear force
*Caution: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Heat tolerance
*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) = 1.34
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also proposals
Advantages and disadvantages of Nd2Fe14B magnets.
Pros
- They do not lose strength, even after around ten years – the decrease in lifting capacity is only ~1% (theoretically),
- They maintain their magnetic properties even under external field action,
- A magnet with a smooth gold surface looks better,
- The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
- Thanks to modularity in forming and the ability to modify to individual projects,
- Universal use in future technologies – they are utilized in mass storage devices, electric drive systems, medical devices, also modern systems.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets decrease their force 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 durability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- whose thickness reaches at least 10 mm
- with an ground touching surface
- under conditions of gap-free contact (surface-to-surface)
- during detachment in a direction perpendicular to the mounting surface
- in temp. approx. 20°C
Practical lifting capacity: influencing factors
- Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
- Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.
Safe handling of neodymium magnets
Safe operation
Handle with care. Rare earth magnets act from a distance and connect with huge force, often quicker than you can react.
Avoid contact if allergic
Studies show that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact or opt for encased magnets.
Keep away from computers
Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and erase data from cards.
Fire warning
Powder generated during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
GPS and phone interference
A strong magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.
Operating temperature
Avoid heat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).
Risk of cracking
Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Bodily injuries
Large magnets can break fingers instantly. Never put your hand between two strong magnets.
Adults only
Always store magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.
Medical interference
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
