MPL 30x10x8 / N38 - lamellar magnet
lamellar magnet
Catalog no 020139
GTIN/EAN: 5906301811459
length
30 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
18 g
Magnetization Direction
↑ axial
Load capacity
12.13 kg / 119.04 N
Magnetic Induction
427.56 mT / 4276 Gs
Coating
[NiCuNi] Nickel
10.71 ZŁ with VAT / pcs + price for transport
8.71 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical details - MPL 30x10x8 / N38 - lamellar magnet
Specification / characteristics - MPL 30x10x8 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020139 |
| GTIN/EAN | 5906301811459 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 30 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 18 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 12.13 kg / 119.04 N |
| Magnetic Induction ~ ? | 427.56 mT / 4276 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 - technical parameters
The following values represent the outcome of a physical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (force vs distance) - characteristics
MPL 30x10x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4273 Gs
427.3 mT
|
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
crushing |
| 1 mm |
3683 Gs
368.3 mT
|
9.01 kg / 19.86 pounds
9009.7 g / 88.4 N
|
strong |
| 2 mm |
3109 Gs
310.9 mT
|
6.42 kg / 14.15 pounds
6419.9 g / 63.0 N
|
strong |
| 3 mm |
2600 Gs
260.0 mT
|
4.49 kg / 9.90 pounds
4488.7 g / 44.0 N
|
strong |
| 5 mm |
1818 Gs
181.8 mT
|
2.20 kg / 4.84 pounds
2195.3 g / 21.5 N
|
strong |
| 10 mm |
825 Gs
82.5 mT
|
0.45 kg / 1.00 pounds
452.4 g / 4.4 N
|
weak grip |
| 15 mm |
431 Gs
43.1 mT
|
0.12 kg / 0.27 pounds
123.4 g / 1.2 N
|
weak grip |
| 20 mm |
248 Gs
24.8 mT
|
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
|
weak grip |
| 30 mm |
101 Gs
10.1 mT
|
0.01 kg / 0.02 pounds
6.8 g / 0.1 N
|
weak grip |
| 50 mm |
28 Gs
2.8 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
weak grip |
Table 2: Slippage load (vertical surface)
MPL 30x10x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.43 kg / 5.35 pounds
2426.0 g / 23.8 N
|
| 1 mm | Stal (~0.2) |
1.80 kg / 3.97 pounds
1802.0 g / 17.7 N
|
| 2 mm | Stal (~0.2) |
1.28 kg / 2.83 pounds
1284.0 g / 12.6 N
|
| 3 mm | Stal (~0.2) |
0.90 kg / 1.98 pounds
898.0 g / 8.8 N
|
| 5 mm | Stal (~0.2) |
0.44 kg / 0.97 pounds
440.0 g / 4.3 N
|
| 10 mm | Stal (~0.2) |
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
24.0 g / 0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x10x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.64 kg / 8.02 pounds
3639.0 g / 35.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.43 kg / 5.35 pounds
2426.0 g / 23.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.21 kg / 2.67 pounds
1213.0 g / 11.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
6.07 kg / 13.37 pounds
6065.0 g / 59.5 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 30x10x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.61 kg / 1.34 pounds
606.5 g / 5.9 N
|
| 1 mm |
|
1.52 kg / 3.34 pounds
1516.3 g / 14.9 N
|
| 2 mm |
|
3.03 kg / 6.69 pounds
3032.5 g / 29.7 N
|
| 3 mm |
|
4.55 kg / 10.03 pounds
4548.8 g / 44.6 N
|
| 5 mm |
|
7.58 kg / 16.71 pounds
7581.3 g / 74.4 N
|
| 10 mm |
|
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
| 11 mm |
|
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
| 12 mm |
|
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MPL 30x10x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
12.13 kg / 26.74 pounds
12130.0 g / 119.0 N
|
OK |
| 40 °C | -2.2% |
11.86 kg / 26.15 pounds
11863.1 g / 116.4 N
|
OK |
| 60 °C | -4.4% |
11.60 kg / 25.57 pounds
11596.3 g / 113.8 N
|
|
| 80 °C | -6.6% |
11.33 kg / 24.98 pounds
11329.4 g / 111.1 N
|
|
| 100 °C | -28.8% |
8.64 kg / 19.04 pounds
8636.6 g / 84.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x10x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
33.78 kg / 74.46 pounds
5 382 Gs
|
5.07 kg / 11.17 pounds
5066 g / 49.7 N
|
N/A |
| 1 mm |
29.33 kg / 64.66 pounds
7 964 Gs
|
4.40 kg / 9.70 pounds
4399 g / 43.2 N
|
26.39 kg / 58.19 pounds
~0 Gs
|
| 2 mm |
25.09 kg / 55.31 pounds
7 366 Gs
|
3.76 kg / 8.30 pounds
3763 g / 36.9 N
|
22.58 kg / 49.78 pounds
~0 Gs
|
| 3 mm |
21.25 kg / 46.85 pounds
6 780 Gs
|
3.19 kg / 7.03 pounds
3188 g / 31.3 N
|
19.13 kg / 42.17 pounds
~0 Gs
|
| 5 mm |
14.97 kg / 32.99 pounds
5 689 Gs
|
2.24 kg / 4.95 pounds
2245 g / 22.0 N
|
13.47 kg / 29.70 pounds
~0 Gs
|
| 10 mm |
6.11 kg / 13.48 pounds
3 636 Gs
|
0.92 kg / 2.02 pounds
917 g / 9.0 N
|
5.50 kg / 12.13 pounds
~0 Gs
|
| 20 mm |
1.26 kg / 2.78 pounds
1 651 Gs
|
0.19 kg / 0.42 pounds
189 g / 1.9 N
|
1.13 kg / 2.50 pounds
~0 Gs
|
| 50 mm |
0.04 kg / 0.10 pounds
308 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 60 mm |
0.02 kg / 0.04 pounds
203 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
| 70 mm |
0.01 kg / 0.02 pounds
140 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 pounds
100 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 pounds
74 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
56 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MPL 30x10x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 9.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 7.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 6.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.5 cm |
| Remote | 50 Gs (5.0 mT) | 4.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 30x10x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
26.78 km/h
(7.44 m/s)
|
0.50 J | |
| 30 mm |
45.36 km/h
(12.60 m/s)
|
1.43 J | |
| 50 mm |
58.54 km/h
(16.26 m/s)
|
2.38 J | |
| 100 mm |
82.79 km/h
(23.00 m/s)
|
4.76 J |
Table 9: Surface protection spec
MPL 30x10x8 / 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 (Flux)
MPL 30x10x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 12 138 Mx | 121.4 µWb |
| Pc Coefficient | 0.51 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 30x10x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 12.13 kg | Standard |
| Water (riverbed) |
13.89 kg
(+1.76 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. Steel saturation
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.51
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of Nd2Fe14B magnets.
Pros
- Their strength remains stable, and after approximately 10 years it drops only by ~1% (according to research),
- They possess excellent resistance to magnetic field loss as a result of external magnetic sources,
- Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
- They feature high magnetic induction at the operating surface, which increases their power,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
- Possibility of individual machining as well as optimizing to specific applications,
- Versatile presence in modern technologies – they are utilized in hard drives, electromotive mechanisms, medical devices, as well as multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in small systems
Cons
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of producing nuts in the magnet and complex shapes - preferred is casing - magnetic holder.
- Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
- Due to expensive raw materials, their price is higher than average,
Pull force analysis
Maximum magnetic pulling force – what it depends on?
- using a plate made of low-carbon steel, serving as a magnetic yoke
- possessing a thickness of at least 10 mm to ensure full flux closure
- with an polished touching surface
- under conditions of no distance (surface-to-surface)
- during pulling in a direction perpendicular to the mounting surface
- in temp. approx. 20°C
What influences lifting capacity in practice
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
- Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
- Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the holding force.
Warnings
Bone fractures
Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.
Demagnetization risk
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.
Keep away from children
These products are not suitable for play. Swallowing several magnets can lead to them attracting across intestines, which constitutes a direct threat to life and requires urgent medical intervention.
Data carriers
Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and erase data from cards.
Fire risk
Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Immense force
Handle with care. Rare earth magnets attract from a long distance and snap with huge force, often quicker than you can react.
Protective goggles
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into small pieces.
Compass and GPS
GPS units and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
Avoid contact if allergic
Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and use protective gear.
Life threat
People with a pacemaker must keep an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.
