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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN/EAN: 5906301811633

5.00

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 with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

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Technical parameters of the product - 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

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
5%
1.19 kg / 2.62 LBS
1190.5 g / 11.7 N
1 mm
13%
2.98 kg / 6.56 LBS
2976.3 g / 29.2 N
2 mm
25%
5.95 kg / 13.12 LBS
5952.5 g / 58.4 N
3 mm
38%
8.93 kg / 19.68 LBS
8928.7 g / 87.6 N
5 mm
63%
14.88 kg / 32.81 LBS
14881.3 g / 146.0 N
10 mm
100%
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
11 mm
100%
23.81 kg / 52.49 LBS
23810.0 g / 233.6 N
12 mm
100%
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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.

Technical specification and ecology
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
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
Measurement Calculator
Pulling force

Field Strength

Other proposals

Model MPL 40x18x10 SH / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 23.81 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 23.81 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x18x10 SH / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (40x18 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following 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

Cons of neodymium magnets: tips and applications.
  • 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 parameterswhat it depends on?

Magnet power is the result of a measurement for optimal configuration, taking into account:
  • 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

In real-world applications, the actual holding force depends on several key aspects, ranked from most significant:
  • 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.

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?