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MPL 40x18x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020156

GTIN/EAN: 5906301811626

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

30.75 with VAT / pcs + price for transport

25.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Parameters along with form of a neodymium magnet can be tested with our magnetic calculator.

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Technical of the product - MPL 40x18x10 / N38 - lamellar magnet

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

properties
properties values
Cat. no. 020156
GTIN/EAN 5906301811626
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 / 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 modeling of the magnet - data

Presented data represent the direct effect of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - power drop
MPL 40x18x10 / 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
strong
10 mm 1370 Gs
137.0 mT
3.32 kg / 7.33 LBS
3324.4 g / 32.6 N
strong
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: Slippage capacity (wall)
MPL 40x18x10 / 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: Wall mounting (sliding) - vertical pull
MPL 40x18x10 / 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 (saturation) - sheet metal selection
MPL 40x18x10 / 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 (material behavior) - power drop
MPL 40x18x10 / 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 range
MPL 40x18x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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: Safety (HSE) (implants) - precautionary measures
MPL 40x18x10 / 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

Table 8: Impact energy (kinetic energy) - warning
MPL 40x18x10 / 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: Corrosion resistance
MPL 40x18x10 / 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 (Flux)
MPL 40x18x10 / 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 / N38

Environment Effective steel pull Effect
Air (land) 23.81 kg Standard
Water (riverbed) 27.26 kg
(+3.45 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Warning: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

*For N38 material, 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
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%
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: 020156-2026
Measurement Calculator
Force (pull)

Magnetic Field

Other offers

Component MPL 40x18x10 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 233.58 N is ready for shipment in 24h, allowing for rapid realization of your project. 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. Watch your fingers! Magnets with a force of 23.81 kg can pinch very hard and cause hematomas. 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 wind generators and material handling systems. Thanks to the flat surface and high force (approx. 23.81 kg), they are ideal as hidden locks 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 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 18 mm (width), and 10 mm (thickness). 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.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even during around ten years – the drop in lifting capacity is only ~1% (according to tests),
  • They show high resistance to demagnetization induced by external field influence,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed machining as well as adapting to specific needs,
  • Wide application in advanced technology sectors – they are commonly used in magnetic memories, drive modules, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Cons of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameterswhat it depends on?

The specified lifting capacity represents the maximum value, measured under ideal test conditions, meaning:
  • with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a surface free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Magnet lifting force in use – key factors

Real force is affected by working environment parameters, such as (from most important):
  • Clearance – existence of foreign body (paint, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost into the air.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Allergic reactions

Certain individuals have a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Extended handling can result in skin redness. It is best to wear protective gloves.

Physical harm

Big blocks can break fingers in a fraction of a second. Never put your hand between two attracting surfaces.

Precision electronics

An intense magnetic field negatively affects the operation of magnetometers in smartphones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.

Mechanical processing

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Magnet fragility

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Respect the power

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Swallowing risk

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

Electronic devices

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Maximum temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Medical interference

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98