MPL 12.5x12.5x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020117
GTIN/EAN: 5906301811237
length
12.5 mm [±0,1 mm]
Width
12.5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
5.86 g
Magnetization Direction
↑ axial
Load capacity
4.84 kg / 47.51 N
Magnetic Induction
360.91 mT / 3609 Gs
Coating
[NiCuNi] Nickel
2.83 ZŁ with VAT / pcs + price for transport
2.30 ZŁ net + 23% VAT / pcs
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Technical specification - MPL 12.5x12.5x5 / N38 - lamellar magnet
Specification / characteristics - MPL 12.5x12.5x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020117 |
| GTIN/EAN | 5906301811237 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 12.5 mm [±0,1 mm] |
| Width | 12.5 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 5.86 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.84 kg / 47.51 N |
| Magnetic Induction ~ ? | 360.91 mT / 3609 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 modeling of the product - report
These data are the direct effect of a mathematical analysis. Values rely on models for the class Nd2Fe14B. Actual performance may differ. Use these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs distance) - interaction chart
MPL 12.5x12.5x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3608 Gs
360.8 mT
|
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
medium risk |
| 1 mm |
3156 Gs
315.6 mT
|
3.70 kg / 8.17 LBS
3704.2 g / 36.3 N
|
medium risk |
| 2 mm |
2671 Gs
267.1 mT
|
2.65 kg / 5.85 LBS
2653.8 g / 26.0 N
|
medium risk |
| 3 mm |
2211 Gs
221.1 mT
|
1.82 kg / 4.01 LBS
1817.7 g / 17.8 N
|
low risk |
| 5 mm |
1464 Gs
146.4 mT
|
0.80 kg / 1.76 LBS
797.6 g / 7.8 N
|
low risk |
| 10 mm |
538 Gs
53.8 mT
|
0.11 kg / 0.24 LBS
107.6 g / 1.1 N
|
low risk |
| 15 mm |
234 Gs
23.4 mT
|
0.02 kg / 0.05 LBS
20.4 g / 0.2 N
|
low risk |
| 20 mm |
119 Gs
11.9 mT
|
0.01 kg / 0.01 LBS
5.3 g / 0.1 N
|
low risk |
| 30 mm |
42 Gs
4.2 mT
|
0.00 kg / 0.00 LBS
0.7 g / 0.0 N
|
low risk |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical capacity (wall)
MPL 12.5x12.5x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.97 kg / 2.13 LBS
968.0 g / 9.5 N
|
| 1 mm | Stal (~0.2) |
0.74 kg / 1.63 LBS
740.0 g / 7.3 N
|
| 2 mm | Stal (~0.2) |
0.53 kg / 1.17 LBS
530.0 g / 5.2 N
|
| 3 mm | Stal (~0.2) |
0.36 kg / 0.80 LBS
364.0 g / 3.6 N
|
| 5 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
160.0 g / 1.6 N
|
| 10 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
22.0 g / 0.2 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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: Vertical assembly (sliding) - vertical pull
MPL 12.5x12.5x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.45 kg / 3.20 LBS
1452.0 g / 14.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.97 kg / 2.13 LBS
968.0 g / 9.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.48 kg / 1.07 LBS
484.0 g / 4.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.42 kg / 5.34 LBS
2420.0 g / 23.7 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12.5x12.5x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.48 kg / 1.07 LBS
484.0 g / 4.7 N
|
| 1 mm |
|
1.21 kg / 2.67 LBS
1210.0 g / 11.9 N
|
| 2 mm |
|
2.42 kg / 5.34 LBS
2420.0 g / 23.7 N
|
| 3 mm |
|
3.63 kg / 8.00 LBS
3630.0 g / 35.6 N
|
| 5 mm |
|
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
| 10 mm |
|
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
| 11 mm |
|
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
| 12 mm |
|
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 12.5x12.5x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
|
OK |
| 40 °C | -2.2% |
4.73 kg / 10.44 LBS
4733.5 g / 46.4 N
|
OK |
| 60 °C | -4.4% |
4.63 kg / 10.20 LBS
4627.0 g / 45.4 N
|
|
| 80 °C | -6.6% |
4.52 kg / 9.97 LBS
4520.6 g / 44.3 N
|
|
| 100 °C | -28.8% |
3.45 kg / 7.60 LBS
3446.1 g / 33.8 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 12.5x12.5x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
12.54 kg / 27.64 LBS
5 069 Gs
|
1.88 kg / 4.15 LBS
1880 g / 18.4 N
|
N/A |
| 1 mm |
11.08 kg / 24.43 LBS
6 783 Gs
|
1.66 kg / 3.66 LBS
1662 g / 16.3 N
|
9.97 kg / 21.98 LBS
~0 Gs
|
| 2 mm |
9.59 kg / 21.15 LBS
6 312 Gs
|
1.44 kg / 3.17 LBS
1439 g / 14.1 N
|
8.63 kg / 19.04 LBS
~0 Gs
|
| 3 mm |
8.18 kg / 18.03 LBS
5 827 Gs
|
1.23 kg / 2.70 LBS
1226 g / 12.0 N
|
7.36 kg / 16.22 LBS
~0 Gs
|
| 5 mm |
5.71 kg / 12.60 LBS
4 871 Gs
|
0.86 kg / 1.89 LBS
857 g / 8.4 N
|
5.14 kg / 11.34 LBS
~0 Gs
|
| 10 mm |
2.07 kg / 4.55 LBS
2 929 Gs
|
0.31 kg / 0.68 LBS
310 g / 3.0 N
|
1.86 kg / 4.10 LBS
~0 Gs
|
| 20 mm |
0.28 kg / 0.61 LBS
1 076 Gs
|
0.04 kg / 0.09 LBS
42 g / 0.4 N
|
0.25 kg / 0.55 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 LBS
136 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
84 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
56 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
39 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
28 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
21 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) - warnings
MPL 12.5x12.5x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MPL 12.5x12.5x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.38 km/h
(8.16 m/s)
|
0.20 J | |
| 30 mm |
50.21 km/h
(13.95 m/s)
|
0.57 J | |
| 50 mm |
64.81 km/h
(18.00 m/s)
|
0.95 J | |
| 100 mm |
91.65 km/h
(25.46 m/s)
|
1.90 J |
Table 9: Coating parameters (durability)
MPL 12.5x12.5x5 / 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)
MPL 12.5x12.5x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 874 Mx | 58.7 µWb |
| Pc Coefficient | 0.46 | Low (Flat) |
Table 11: Submerged application
MPL 12.5x12.5x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.84 kg | Standard |
| Water (riverbed) |
5.54 kg
(+0.70 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens 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) = 0.46
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also deals
Strengths as well as weaknesses of neodymium magnets.
Benefits
- Their power is maintained, and after around ten years it decreases only by ~1% (theoretically),
- Neodymium magnets are characterized by highly resistant to magnetic field loss caused by external interference,
- Thanks to the reflective finish, the coating of nickel, gold, or silver-plated gives an aesthetic appearance,
- Magnetic induction on the surface of the magnet is extremely intense,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of precise creating and adjusting to individual requirements,
- Significant place in electronics industry – they are commonly used in mass storage devices, electromotive mechanisms, medical equipment, also other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices
Cons
- At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Limited possibility of making nuts in the magnet and complicated shapes - recommended is a housing - magnet mounting.
- Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what it depends on?
- with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by even structure
- under conditions of no distance (metal-to-metal)
- during detachment in a direction perpendicular to the mounting surface
- in temp. approx. 20°C
Lifting capacity in practice – influencing factors
- Space between magnet and steel – even a fraction of a 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 – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.
Precautions when working with NdFeB magnets
Safe distance
Avoid bringing magnets near a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Shattering risk
Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
Dust is flammable
Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.
Keep away from children
Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.
Conscious usage
Handle with care. Neodymium magnets act from a long distance and snap with huge force, often faster than you can react.
Magnetic interference
Remember: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.
Bodily injuries
Big blocks can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.
Do not overheat magnets
Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
Avoid contact if allergic
Certain individuals experience a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to a rash. We recommend use protective gloves.
Life threat
Individuals with a pacemaker have to maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.
