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MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

→ diametrical

Load capacity

16.72 kg / 164.01 N

Magnetic Induction

540.48 mT / 5405 Gs

Coating

[NiCuNi] Nickel

view parameters »

18.45 ZŁ with VAT / pcs + price for transport

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Parameters along with structure of neodymium magnets can be analyzed using our modular calculator.

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Technical parameters - MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet

properties
properties values
Cat. no. 020149
GTIN/EAN 5906301811558
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 10 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 54 g
Magnetization Direction → diametrical
Load capacity ~ ? 16.72 kg / 164.01 N
Magnetic Induction ~ ? 540.48 mT / 5405 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / 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

Engineering modeling of the magnet - data

The following information constitute the direct effect of a mathematical simulation. Values are based on models for the material Nd2Fe14B. Actual conditions may differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MPL 40x10x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5402 Gs
540.2 mT
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 critical level
1 mm 4664 Gs
466.4 mT
 12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
 critical level
2 mm 3970 Gs
397.0 mT
 9.03 kg / 19.90 lbs
9028.7 g / 88.6 N
 strong
3 mm 3362 Gs
336.2 mT
 6.48 kg / 14.28 lbs
6476.4 g / 63.5 N
 strong
5 mm 2432 Gs
243.2 mT
 3.39 kg / 7.47 lbs
3388.5 g / 33.2 N
 strong
10 mm 1220 Gs
122.0 mT
 0.85 kg / 1.88 lbs
853.2 g / 8.4 N
 weak grip
15 mm 703 Gs
70.3 mT
 0.28 kg / 0.62 lbs
282.9 g / 2.8 N
 weak grip
20 mm 440 Gs
44.0 mT
 0.11 kg / 0.24 lbs
111.1 g / 1.1 N
 weak grip
30 mm 203 Gs
20.3 mT
 0.02 kg / 0.05 lbs
23.6 g / 0.2 N
 weak grip
50 mm 64 Gs
6.4 mT
 0.00 kg / 0.01 lbs
2.4 g / 0.0 N
 weak grip
Magnetic force decreases significantly per each millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, rust) significantly diminishes the holding power. Magnetic products work optimally in perfect adhesion; air break drastically cuts the force. Analyze how rapidly the parameters fall, when the magnet does not adhere directly to the steel surface. When designing the assembly, eliminate redundant distances.

Table 2: Sliding capacity (wall)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 lbs
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 lbs
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 lbs
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 lbs
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 lbs
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 lbs
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the approximate shear load required to start the downward movement of the magnet down against a upright steel wall (assuming standard friction coefficient). This parameter is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x10x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.02 kg / 11.06 lbs
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 lbs
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 lbs
8360.0 g / 82.0 N
When mounting a element on a upright surface (e.g., a car body), it will only hold just about 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that products move down faster than they pop off the substrate. Want to create a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will give way down under a noticeably lighter weight. Utilizing a rubberized coating can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.84 lbs
836.0 g / 8.2 N
1 mm
13%
 2.09 kg / 4.61 lbs
2090.0 g / 20.5 N
2 mm
25%
 4.18 kg / 9.22 lbs
4180.0 g / 41.0 N
3 mm
38%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
5 mm
63%
 10.45 kg / 23.04 lbs
10450.0 g / 102.5 N
10 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
11 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
12 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
A thin metal plate is unable to take in the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the field will pass right through and the pull force will drop sharply. To squeeze 100% of this neodymium's potential, you require a sufficiently solid piece of steel. The saturation phenomenon means that on thin elements (e.g., appliance housings), the magnet works worse. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x10x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 OK
40 °C -2.2% 16.35 kg / 36.05 lbs
16352.2 g / 160.4 N
 OK
60 °C -4.4% 15.98 kg / 35.24 lbs
15984.3 g / 156.8 N
 OK
80 °C -6.6% 15.62 kg / 34.43 lbs
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 lbs
11904.6 g / 116.8 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently damage this product. With increasing heat, the magnet's force briefly decreases. Do not use this magnet in hot environments higher than its safe range. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.96 kg / 158.65 lbs
5 928 Gs
10.79 kg / 23.80 lbs
10794 g / 105.9 N
 N/A
1 mm 62.49 kg / 137.76 lbs
10 068 Gs
9.37 kg / 20.66 lbs
9373 g / 91.9 N
 56.24 kg / 123.98 lbs
~0 Gs
2 mm 53.65 kg / 118.27 lbs
9 328 Gs
8.05 kg / 17.74 lbs
8047 g / 78.9 N
 48.28 kg / 106.44 lbs
~0 Gs
3 mm 45.76 kg / 100.88 lbs
8 615 Gs
6.86 kg / 15.13 lbs
6864 g / 67.3 N
 41.18 kg / 90.79 lbs
~0 Gs
5 mm 32.92 kg / 72.58 lbs
7 308 Gs
4.94 kg / 10.89 lbs
4938 g / 48.4 N
 29.63 kg / 65.32 lbs
~0 Gs
10 mm 14.58 kg / 32.15 lbs
4 864 Gs
2.19 kg / 4.82 lbs
2188 g / 21.5 N
 13.13 kg / 28.94 lbs
~0 Gs
20 mm 3.67 kg / 8.10 lbs
2 441 Gs
0.55 kg / 1.21 lbs
551 g / 5.4 N
 3.30 kg / 7.29 lbs
~0 Gs
50 mm 0.21 kg / 0.46 lbs
585 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
60 mm 0.10 kg / 0.22 lbs
406 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
70 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.10 lbs
~0 Gs
80 mm 0.03 kg / 0.06 lbs
217 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
165 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.03 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
128 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a larger range of operation. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the pinch force is huge. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Figures show shear force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 40x10x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 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 poses a large risk to IT equipment as well as pacemakers. These magnets produce a flux that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.30 km/h
(5.08 m/s)
 0.70 J
30 mm 30.76 km/h
(8.55 m/s)
 1.97 J
50 mm 39.69 km/h
(11.02 m/s)
 3.28 J
100 mm 56.12 km/h
(15.59 m/s)
 6.56 J
NdFeB products are delicate – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or painful pinches to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 40x10x18 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MPL 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 40x10x18 / N38

Environment Effective steel pull Effect
Air (land) 16.72 kg Standard
Water (riverbed) 19.14 kg
(+2.42 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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.

Technical specification and ecology
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: 020149-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x18 mm and a weight of 54 g, guarantees premium class connection. This magnetic block with a force of 164.01 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 40x10x18 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x10x18 mm, which, at a weight of 54 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x10x18 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 and cons of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
  • Neodymium magnets remain extremely resistant to demagnetization caused by external field sources,
  • Thanks to the elegant finish, the coating of nickel, gold, or silver-plated gives an visually attractive appearance,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in constructing and the capacity to modify to individual projects,
  • Wide application in modern technologies – they serve a role in hard drives, brushless drives, diagnostic systems, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its 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.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend casing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The declared magnet strength concerns the maximum value, measured under laboratory conditions, meaning:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by working environment parameters, such as (from most important):
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • 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.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Do not give to children

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.

Bone fractures

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Magnetic interference

Remember: neodymium magnets produce a field that confuses precision electronics. Keep a separation from your phone, device, and GPS.

Do not drill into magnets

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Implant safety

Patients with a pacemaker must keep an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Maximum temperature

Keep cool. Neodymium magnets are sensitive to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Risk of cracking

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them cracking into small pieces.

Caution required

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

Avoid contact if allergic

Some people experience a sensitization to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to dermatitis. We strongly advise wear safety gloves.

Electronic hazard

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can permanently damage these devices and erase data from cards.

Security! More info about hazards in the article: Magnet Safety Guide.