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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Product card - 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 |
Technical simulation of the magnet - report
These data are the result of a physical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - power drop
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
|
crushing |
| 1 mm |
3399 Gs
339.9 mT
|
20.48 kg / 45.14 lbs
20476.1 g / 200.9 N
|
crushing |
| 2 mm |
3120 Gs
312.0 mT
|
17.25 kg / 38.02 lbs
17245.9 g / 169.2 N
|
crushing |
| 3 mm |
2841 Gs
284.1 mT
|
14.30 kg / 31.54 lbs
14304.1 g / 140.3 N
|
crushing |
| 5 mm |
2321 Gs
232.1 mT
|
9.55 kg / 21.05 lbs
9547.8 g / 93.7 N
|
warning |
| 10 mm |
1370 Gs
137.0 mT
|
3.32 kg / 7.33 lbs
3324.4 g / 32.6 N
|
warning |
| 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 capacity (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 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: Steel thickness (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 resistance (material behavior) - power drop
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 (attraction) - field collision
MPL 40x18x10 SH / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 8.5 cm |
| Phone / Smartphone | 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: 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: Coating parameters (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: 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: Underwater work (magnet fishing)
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
*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Thermal stability
*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 offers
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- Their power is durable, and after around ten years it decreases only by ~1% (according to research),
- They possess excellent resistance to weakening of magnetic properties when exposed to external fields,
- In other words, due to the smooth layer of nickel, the element gains a professional look,
- Magnetic induction on the working layer of the magnet remains strong,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to the possibility of precise forming and customization to custom solutions, neodymium magnets can be modeled in a variety of shapes and sizes, which expands the range of possible applications,
- Key role in electronics industry – they are utilized in data components, electric motors, medical devices, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in small systems
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
- Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- Due to complex production process, their price is higher than average,
Pull force analysis
Highest magnetic holding force – what it depends on?
- using a base made of high-permeability steel, acting as a ideal flux conductor
- possessing a thickness of min. 10 mm to ensure full flux closure
- with an ideally smooth contact surface
- with zero gap (without impurities)
- for force acting at a right angle (in the magnet axis)
- in temp. approx. 20°C
Practical lifting capacity: influencing factors
- Distance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
- Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.
H&S for magnets
Crushing force
Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Compass and GPS
Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your mobile, device, and navigation systems.
Protect data
Do not bring magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.
Nickel allergy
It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact or choose versions in plastic housing.
Danger to pacemakers
Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.
Fire warning
Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.
Thermal limits
Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
Adults only
Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.
Magnets are brittle
Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.
Caution required
Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
