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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN/EAN: 5906301811633

5.00
Load capacity 23.81 kg / 233.58 N Magnetic Induction 366.66 mT / 3667 Gs
length
40 mm [±0,1 mm]
Width
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see properties »

36.29 zł with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data - MPL 40x18x10 SH / N38 - lamellar magnet

Specification / characteristics - MPL 40x18x10 SH / N38 - lamellar magnet

properties
properties values
Cat. no. 020157
GTIN/EAN 5906301811633
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MPL 40x18x10 SH / N38 - lamellar magnet
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

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 modeling of the assembly - data

The following data constitute the result of a mathematical simulation. Values are based on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap during assembly planning.

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
 critical level
1 mm 3399 Gs
339.9 mT
 20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
 critical level
2 mm 3120 Gs
312.0 mT
 17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
 critical level
3 mm 2841 Gs
284.1 mT
 14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
 critical level
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
 safe
20 mm 530 Gs
53.0 mT
 0.50 kg / 1.10 pounds
498.1 g / 4.9 N
 safe
30 mm 244 Gs
24.4 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 safe
50 mm 75 Gs
7.5 mT
 0.01 kg / 0.02 pounds
9.9 g / 0.1 N
 safe
Grip strength decreases drastically with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) strongly diminishes the holding power. Magnets hold optimally during direct contact; air break weakens the force. Analyze how rapidly the parameters drop, when the magnet does not touch flatly to the metal substrate. When planning the arrangement, avoid redundant distances.

Table 2: Slippage force (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 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
The table below shows the estimated holding capacity necessary to cause the shifting of the magnet vertically against a vertical metal surface (assuming typical friction coefficient). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 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
When hanging a holder on a vertical plane (e.g., a fridge), it you can count on just about 1/5 of its nominal power. Gravitational force and a low friction coefficient cause that holders move down easier than they pull off. Planning a hanger? Note that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter load. Using a rubber pad can effectively increase the grip.

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
5%
 1.19 kg / 2.62 pounds
1190.5 g / 11.7 N
1 mm
13%
 2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
2 mm
25%
 5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
3 mm
38%
 8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
5 mm
63%
 14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
10 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
11 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
12 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
A too thin steel is not enough to conduct the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the field will pass right through and the attraction force will be weaker. To achieve the maximum of this magnet's potential, you need a suitably thick backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly destroy this magnet. With every degree above norm, the magnet's force briefly drops. Do not use this magnet near heat sources exceeding its working range. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties sooner than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (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
Two magnets attract each other from a wider radius than a magnet and steel setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density between like poles drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Attention: Results show sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (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
Timepiece 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
Extremely neodym field is a serious hazard to IT equipment and pacemakers. These magnets produce a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - collision effects
MPL 40x18x10 SH / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.75 km/h
(6.32 m/s)
 1.08 J
30 mm 24.44 km/h
(6.79 m/s)
 1.24 J
50 mm 24.51 km/h
(6.81 m/s)
 1.25 J
100 mm 24.52 km/h
(6.81 m/s)
 1.25 J
NdFeB products are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with large magnets.

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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient determines the magnet's operating point.

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*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.

Engineering data and GPSR

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%

Sustainability

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020157-2026
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Component MPL 40x18x10 SH / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 23.81 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x18x10 SH / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x18x10 mm, which, at a weight of 54 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x18x10 mm and a self-weight of 54 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a smooth silver surface looks better,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the potential of precise shaping and adaptation to specialized requirements, NdFeB magnets can be manufactured in a broad palette of forms and dimensions, which increases their versatility,
  • Fundamental importance in advanced technology sectors – they are utilized in magnetic memories, electromotive mechanisms, medical equipment, and industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise 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 a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity represents the maximum value, recorded under ideal test conditions, meaning:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • whose thickness is min. 10 mm
  • with a surface cleaned and smooth
  • with direct contact (without coatings)
  • under vertical application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Real force is affected by working environment parameters, mainly (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Magnet fragility

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Bodily injuries

Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Pacemakers

For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Operating temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Flammability

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Sensitization to coating

A percentage of the population suffer from a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause an allergic reaction. We suggest wear protective gloves.

Do not underestimate power

Handle magnets with awareness. Their immense force can surprise even professionals. Stay alert and respect their power.

Product not for children

Always keep magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are tragic.

Electronic hazard

Data protection: Strong magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Compass and GPS

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?