MPL 40x18x10 SH / N38 - lamellar magnet
lamellar magnet
Catalog no 020157
GTIN/EAN: 5906301811633
length
40 mm [±0,1 mm]
Width
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
↑ axial
Load capacity
23.81 kg / 233.58 N
Magnetic Induction
366.66 mT / 3667 Gs
Coating
[NiCuNi] Nickel
36.29 ZŁ with VAT / pcs + price for transport
29.50 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical parameters of the product - MPL 40x18x10 SH / N38 - lamellar magnet
Specification / characteristics - MPL 40x18x10 SH / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020157 |
| GTIN/EAN | 5906301811633 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 18 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 54 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 23.81 kg / 233.58 N |
| Magnetic Induction ~ ? | 366.66 mT / 3667 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 |
Physical simulation of the assembly - report
These information constitute the outcome of a mathematical simulation. Values were calculated on models for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a reference point for designers.
Table 1: Static force (pull vs distance) - characteristics
MPL 40x18x10 SH / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3666 Gs
366.6 mT
|
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
|
dangerous! |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 45.14 LBS
20476.1 g / 200.9 N
|
dangerous! |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 38.02 LBS
17245.9 g / 169.2 N
|
dangerous! |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 31.54 LBS
14304.1 g / 140.3 N
|
dangerous! |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 21.05 LBS
9547.8 g / 93.7 N
|
medium risk |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 7.33 LBS
3324.4 g / 32.6 N
|
medium risk |
| 15 mm |
833 Gs
83.3 mT
|
1.23 kg / 2.71 LBS
1229.0 g / 12.1 N
|
weak grip |
| 20 mm |
530 Gs
53.0 mT
|
0.50 kg / 1.10 LBS
498.1 g / 4.9 N
|
weak grip |
| 30 mm |
244 Gs
24.4 mT
|
0.11 kg / 0.23 LBS
105.3 g / 1.0 N
|
weak grip |
| 50 mm |
75 Gs
7.5 mT
|
0.01 kg / 0.02 LBS
9.9 g / 0.1 N
|
weak grip |
Table 2: Sliding load (wall)
MPL 40x18x10 SH / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.76 kg / 10.50 LBS
4762.0 g / 46.7 N
|
| 1 mm | Stal (~0.2) |
4.10 kg / 9.03 LBS
4096.0 g / 40.2 N
|
| 2 mm | Stal (~0.2) |
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
| 3 mm | Stal (~0.2) |
2.86 kg / 6.31 LBS
2860.0 g / 28.1 N
|
| 5 mm | Stal (~0.2) |
1.91 kg / 4.21 LBS
1910.0 g / 18.7 N
|
| 10 mm | Stal (~0.2) |
0.66 kg / 1.46 LBS
664.0 g / 6.5 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 0.54 LBS
246.0 g / 2.4 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.22 LBS
100.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
22.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x18x10 SH / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
7.14 kg / 15.75 LBS
7143.0 g / 70.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.76 kg / 10.50 LBS
4762.0 g / 46.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.38 kg / 5.25 LBS
2381.0 g / 23.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
11.91 kg / 26.25 LBS
11905.0 g / 116.8 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x18x10 SH / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.19 kg / 2.62 LBS
1190.5 g / 11.7 N
|
| 1 mm |
|
2.98 kg / 6.56 LBS
2976.3 g / 29.2 N
|
| 2 mm |
|
5.95 kg / 13.12 LBS
5952.5 g / 58.4 N
|
| 3 mm |
|
8.93 kg / 19.68 LBS
8928.7 g / 87.6 N
|
| 5 mm |
|
14.88 kg / 32.81 LBS
14881.3 g / 146.0 N
|
| 10 mm |
|
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
|
| 11 mm |
|
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
|
| 12 mm |
|
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
|
Table 5: Thermal stability (stability) - resistance threshold
MPL 40x18x10 SH / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
|
OK |
| 40 °C | -2.2% |
23.29 kg / 51.34 LBS
23286.2 g / 228.4 N
|
OK |
| 60 °C | -4.4% |
22.76 kg / 50.18 LBS
22762.4 g / 223.3 N
|
|
| 80 °C | -6.6% |
22.24 kg / 49.03 LBS
22238.5 g / 218.2 N
|
|
| 100 °C | -28.8% |
16.95 kg / 37.37 LBS
16952.7 g / 166.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 40x18x10 SH / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.64 kg / 131.49 LBS
5 034 Gs
|
8.95 kg / 19.72 LBS
8947 g / 87.8 N
|
N/A |
| 1 mm |
55.50 kg / 122.35 LBS
7 072 Gs
|
8.32 kg / 18.35 LBS
8325 g / 81.7 N
|
49.95 kg / 110.12 LBS
~0 Gs
|
| 2 mm |
51.29 kg / 113.08 LBS
6 799 Gs
|
7.69 kg / 16.96 LBS
7694 g / 75.5 N
|
46.16 kg / 101.77 LBS
~0 Gs
|
| 3 mm |
47.18 kg / 104.01 LBS
6 520 Gs
|
7.08 kg / 15.60 LBS
7076 g / 69.4 N
|
42.46 kg / 93.61 LBS
~0 Gs
|
| 5 mm |
39.41 kg / 86.88 LBS
5 959 Gs
|
5.91 kg / 13.03 LBS
5912 g / 58.0 N
|
35.47 kg / 78.20 LBS
~0 Gs
|
| 10 mm |
23.92 kg / 52.73 LBS
4 643 Gs
|
3.59 kg / 7.91 LBS
3588 g / 35.2 N
|
21.53 kg / 47.46 LBS
~0 Gs
|
| 20 mm |
8.33 kg / 18.36 LBS
2 739 Gs
|
1.25 kg / 2.75 LBS
1249 g / 12.3 N
|
7.49 kg / 16.52 LBS
~0 Gs
|
| 50 mm |
0.55 kg / 1.22 LBS
705 Gs
|
0.08 kg / 0.18 LBS
83 g / 0.8 N
|
0.50 kg / 1.09 LBS
~0 Gs
|
| 60 mm |
0.26 kg / 0.58 LBS
487 Gs
|
0.04 kg / 0.09 LBS
40 g / 0.4 N
|
0.24 kg / 0.52 LBS
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 LBS
348 Gs
|
0.02 kg / 0.04 LBS
20 g / 0.2 N
|
0.12 kg / 0.27 LBS
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 LBS
256 Gs
|
0.01 kg / 0.02 LBS
11 g / 0.1 N
|
0.07 kg / 0.14 LBS
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 LBS
194 Gs
|
0.01 kg / 0.01 LBS
6 g / 0.1 N
|
0.04 kg / 0.08 LBS
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 LBS
149 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MPL 40x18x10 SH / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 14.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 11.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 8.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MPL 40x18x10 SH / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.95 km/h
(6.38 m/s)
|
1.10 J | |
| 30 mm |
36.78 km/h
(10.22 m/s)
|
2.82 J | |
| 50 mm |
47.37 km/h
(13.16 m/s)
|
4.67 J | |
| 100 mm |
66.97 km/h
(18.60 m/s)
|
9.34 J |
Table 9: Surface protection spec
MPL 40x18x10 SH / 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 40x18x10 SH / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 26 060 Mx | 260.6 µWb |
| Pc Coefficient | 0.43 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 40x18x10 SH / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 23.81 kg | Standard |
| Water (riverbed) |
27.26 kg
(+3.45 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds only ~20% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces 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) = 0.43
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 |
Other proposals
Pros as well as cons of neodymium magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- They retain their magnetic properties even under close interference source,
- In other words, due to the metallic finish of nickel, the element gains a professional look,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
- Possibility of custom forming and adjusting to concrete applications,
- Fundamental importance in modern industrial fields – they find application in magnetic memories, electric drive systems, precision medical tools, and modern systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- We suggest a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small components of these products can disrupt the diagnostic process medical when they are in 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
Best holding force of the magnet in ideal parameters – what it depends on?
- on a plate made of mild steel, perfectly concentrating the magnetic flux
- with a cross-section minimum 10 mm
- characterized by even structure
- without the slightest air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Air gap (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
- Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
- Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Precautions when working with NdFeB magnets
Life threat
Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Nickel allergy
Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.
Dust is flammable
Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.
Electronic devices
Do not bring magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Swallowing risk
Adult use only. Small elements can be swallowed, causing serious injuries. Keep away from children and animals.
Do not underestimate power
Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.
Beware of splinters
Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them shattering into shards.
Finger safety
Danger of trauma: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Phone sensors
An intense magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets near a smartphone to avoid breaking the sensors.
Heat sensitivity
Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.
