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
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Technical specification 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 |
Engineering analysis of the magnet - data
These data are the direct effect of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Please consider these data as a preliminary roadmap 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 pounds
23810.0 g / 233.6 N
|
dangerous! |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
|
dangerous! |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
|
dangerous! |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
|
dangerous! |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 21.05 pounds
9547.8 g / 93.7 N
|
warning |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 7.33 pounds
3324.4 g / 32.6 N
|
warning |
| 15 mm |
833 Gs
83.3 mT
|
1.23 kg / 2.71 pounds
1229.0 g / 12.1 N
|
low risk |
| 20 mm |
530 Gs
53.0 mT
|
0.50 kg / 1.10 pounds
498.1 g / 4.9 N
|
low risk |
| 30 mm |
244 Gs
24.4 mT
|
0.11 kg / 0.23 pounds
105.3 g / 1.0 N
|
low risk |
| 50 mm |
75 Gs
7.5 mT
|
0.01 kg / 0.02 pounds
9.9 g / 0.1 N
|
low risk |
Table 2: Vertical load (vertical surface)
MPL 40x18x10 SH / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
|
| 1 mm | Stal (~0.2) |
4.10 kg / 9.03 pounds
4096.0 g / 40.2 N
|
| 2 mm | Stal (~0.2) |
3.45 kg / 7.61 pounds
3450.0 g / 33.8 N
|
| 3 mm | Stal (~0.2) |
2.86 kg / 6.31 pounds
2860.0 g / 28.1 N
|
| 5 mm | Stal (~0.2) |
1.91 kg / 4.21 pounds
1910.0 g / 18.7 N
|
| 10 mm | Stal (~0.2) |
0.66 kg / 1.46 pounds
664.0 g / 6.5 N
|
| 15 mm | Stal (~0.2) |
0.25 kg / 0.54 pounds
246.0 g / 2.4 N
|
| 20 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
100.0 g / 1.0 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 pounds
7143.0 g / 70.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.38 kg / 5.25 pounds
2381.0 g / 23.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
11.91 kg / 26.25 pounds
11905.0 g / 116.8 N
|
Table 4: Material efficiency (saturation) - 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 pounds
1190.5 g / 11.7 N
|
| 1 mm |
|
2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
|
| 2 mm |
|
5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
|
| 3 mm |
|
8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
|
| 5 mm |
|
14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
|
| 10 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
| 11 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
| 12 mm |
|
23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
|
Table 5: Working in heat (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 pounds
23810.0 g / 233.6 N
|
OK |
| 40 °C | -2.2% |
23.29 kg / 51.34 pounds
23286.2 g / 228.4 N
|
OK |
| 60 °C | -4.4% |
22.76 kg / 50.18 pounds
22762.4 g / 223.3 N
|
|
| 80 °C | -6.6% |
22.24 kg / 49.03 pounds
22238.5 g / 218.2 N
|
|
| 100 °C | -28.8% |
16.95 kg / 37.37 pounds
16952.7 g / 166.3 N
|
Table 6: Two magnets (repulsion) - field collision
MPL 40x18x10 SH / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.64 kg / 131.49 pounds
5 034 Gs
|
8.95 kg / 19.72 pounds
8947 g / 87.8 N
|
N/A |
| 1 mm |
55.50 kg / 122.35 pounds
7 072 Gs
|
8.32 kg / 18.35 pounds
8325 g / 81.7 N
|
49.95 kg / 110.12 pounds
~0 Gs
|
| 2 mm |
51.29 kg / 113.08 pounds
6 799 Gs
|
7.69 kg / 16.96 pounds
7694 g / 75.5 N
|
46.16 kg / 101.77 pounds
~0 Gs
|
| 3 mm |
47.18 kg / 104.01 pounds
6 520 Gs
|
7.08 kg / 15.60 pounds
7076 g / 69.4 N
|
42.46 kg / 93.61 pounds
~0 Gs
|
| 5 mm |
39.41 kg / 86.88 pounds
5 959 Gs
|
5.91 kg / 13.03 pounds
5912 g / 58.0 N
|
35.47 kg / 78.20 pounds
~0 Gs
|
| 10 mm |
23.92 kg / 52.73 pounds
4 643 Gs
|
3.59 kg / 7.91 pounds
3588 g / 35.2 N
|
21.53 kg / 47.46 pounds
~0 Gs
|
| 20 mm |
8.33 kg / 18.36 pounds
2 739 Gs
|
1.25 kg / 2.75 pounds
1249 g / 12.3 N
|
7.49 kg / 16.52 pounds
~0 Gs
|
| 50 mm |
0.55 kg / 1.22 pounds
705 Gs
|
0.08 kg / 0.18 pounds
83 g / 0.8 N
|
0.50 kg / 1.09 pounds
~0 Gs
|
| 60 mm |
0.26 kg / 0.58 pounds
487 Gs
|
0.04 kg / 0.09 pounds
40 g / 0.4 N
|
0.24 kg / 0.52 pounds
~0 Gs
|
| 70 mm |
0.13 kg / 0.30 pounds
348 Gs
|
0.02 kg / 0.04 pounds
20 g / 0.2 N
|
0.12 kg / 0.27 pounds
~0 Gs
|
| 80 mm |
0.07 kg / 0.16 pounds
256 Gs
|
0.01 kg / 0.02 pounds
11 g / 0.1 N
|
0.07 kg / 0.14 pounds
~0 Gs
|
| 90 mm |
0.04 kg / 0.09 pounds
194 Gs
|
0.01 kg / 0.01 pounds
6 g / 0.1 N
|
0.04 kg / 0.08 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.05 pounds
149 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 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: Impact energy (kinetic energy) - 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: Anti-corrosion coating durability
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: Construction 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: Submerged application
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. Vertical hold
*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*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) = 0.43
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.
Chemical composition
| 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
Strengths as well as weaknesses of rare earth magnets.
Strengths
- Their strength remains stable, and after around 10 years it decreases only by ~1% (theoretically),
- Magnets effectively protect themselves against demagnetization caused by external fields,
- A magnet with a smooth gold surface has better aesthetics,
- Magnetic induction on the top side of the magnet turns out to be extremely intense,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to modularity in designing and the ability to adapt to unusual requirements,
- Universal use in advanced technology sectors – they serve a role in mass storage devices, motor assemblies, diagnostic systems, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in miniature devices
Limitations
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We recommend cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
- Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to complicate diagnosis medical after entering the body.
- Due to expensive raw materials, their price exceeds standard values,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the use of a yoke made of special test steel, ensuring maximum field concentration
- with a thickness minimum 10 mm
- with an ground touching surface
- without any clearance between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at temperature room level
Practical aspects of lifting capacity – factors
- Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel type – mild steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
- Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
- Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was measured using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.
Precautions when working with NdFeB magnets
Threat to navigation
Be aware: neodymium magnets produce a field that interferes with precision electronics. Keep a separation from your phone, tablet, and GPS.
Medical implants
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Permanent damage
Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Immense force
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Magnets are brittle
NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them shattering into shards.
Metal Allergy
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, cease handling magnets and use protective gear.
Flammability
Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Crushing risk
Protect your hands. Two large magnets will snap together immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Product not for children
Neodymium magnets are not toys. Eating several magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.
Keep away from computers
Device Safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).
