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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

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Technical of the product - 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 analysis of the assembly - technical parameters

The following information constitute the direct effect of a mathematical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these calculations as a reference point for designers.

Table 1: Static pull force (force vs distance) - 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 pounds
16720.0 g / 164.0 N
 dangerous!
1 mm 4664 Gs
466.4 mT
 12.46 kg / 27.48 pounds
12464.6 g / 122.3 N
 dangerous!
2 mm 3970 Gs
397.0 mT
 9.03 kg / 19.90 pounds
9028.7 g / 88.6 N
 medium risk
3 mm 3362 Gs
336.2 mT
 6.48 kg / 14.28 pounds
6476.4 g / 63.5 N
 medium risk
5 mm 2432 Gs
243.2 mT
 3.39 kg / 7.47 pounds
3388.5 g / 33.2 N
 medium risk
10 mm 1220 Gs
122.0 mT
 0.85 kg / 1.88 pounds
853.2 g / 8.4 N
 low risk
15 mm 703 Gs
70.3 mT
 0.28 kg / 0.62 pounds
282.9 g / 2.8 N
 low risk
20 mm 440 Gs
44.0 mT
 0.11 kg / 0.24 pounds
111.1 g / 1.1 N
 low risk
30 mm 203 Gs
20.3 mT
 0.02 kg / 0.05 pounds
23.6 g / 0.2 N
 low risk
50 mm 64 Gs
6.4 mT
 0.00 kg / 0.01 pounds
2.4 g / 0.0 N
 low risk
Pulling power weakens drastically with every subsequent millimeter of distance. Remember that even a very thin break (e.g., contamination, paint, rust) strongly weakens the grip. Magnets hold most effectively during direct contact; air break nullifies the force. Analyze how rapidly the parameters plummet, when the magnet does not touch directly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Slippage load (vertical surface)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 pounds
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 pounds
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 pounds
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 pounds
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 pounds
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 pounds
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 pounds
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the theoretical holding capacity necessary to start the downward movement of the magnet downwards against a upright metal surface (considering standard friction). This parameter varies with the air gap between the magnet and the surface.

Table 3: Vertical assembly (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 pounds
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 pounds
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 pounds
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 pounds
8360.0 g / 82.0 N
When mounting a element on a upright surface (e.g., a board), it will maintain barely approx. 1/5 of its nominal power. Gravity as well as a low friction coefficient mean that magnets slip easier than they pop off the substrate. Planning a hanger? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a noticeably lighter cargo. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (saturation) - 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 pounds
836.0 g / 8.2 N
1 mm
13%
 2.09 kg / 4.61 pounds
2090.0 g / 20.5 N
2 mm
25%
 4.18 kg / 9.22 pounds
4180.0 g / 41.0 N
3 mm
38%
 6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
5 mm
63%
 10.45 kg / 23.04 pounds
10450.0 g / 102.5 N
10 mm
100%
 16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
11 mm
100%
 16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
12 mm
100%
 16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
A thin sheet is unable to focus the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick piece of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the magnet holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (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 pounds
16720.0 g / 164.0 N
 OK
40 °C -2.2% 16.35 kg / 36.05 pounds
16352.2 g / 160.4 N
 OK
60 °C -4.4% 15.98 kg / 35.24 pounds
15984.3 g / 156.8 N
 OK
80 °C -6.6% 15.62 kg / 34.43 pounds
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 pounds
11904.6 g / 116.8 N
Standard neodymium magnets lose strength past the thermal threshold. Avoid high temperatures – high temperature can permanently destroy this product. With every degree above norm, the neodymium's power momentarily drops. Refrain from using this product in hot environments exceeding its safe range. Exceeding the critical threshold will lead to destruction of magnetism.
*Important note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
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 pounds
5 928 Gs
10.79 kg / 23.80 pounds
10794 g / 105.9 N
 N/A
1 mm 62.49 kg / 137.76 pounds
10 068 Gs
9.37 kg / 20.66 pounds
9373 g / 91.9 N
 56.24 kg / 123.98 pounds
~0 Gs
2 mm 53.65 kg / 118.27 pounds
9 328 Gs
8.05 kg / 17.74 pounds
8047 g / 78.9 N
 48.28 kg / 106.44 pounds
~0 Gs
3 mm 45.76 kg / 100.88 pounds
8 615 Gs
6.86 kg / 15.13 pounds
6864 g / 67.3 N
 41.18 kg / 90.79 pounds
~0 Gs
5 mm 32.92 kg / 72.58 pounds
7 308 Gs
4.94 kg / 10.89 pounds
4938 g / 48.4 N
 29.63 kg / 65.32 pounds
~0 Gs
10 mm 14.58 kg / 32.15 pounds
4 864 Gs
2.19 kg / 4.82 pounds
2188 g / 21.5 N
 13.13 kg / 28.94 pounds
~0 Gs
20 mm 3.67 kg / 8.10 pounds
2 441 Gs
0.55 kg / 1.21 pounds
551 g / 5.4 N
 3.30 kg / 7.29 pounds
~0 Gs
50 mm 0.21 kg / 0.46 pounds
585 Gs
0.03 kg / 0.07 pounds
32 g / 0.3 N
 0.19 kg / 0.42 pounds
~0 Gs
60 mm 0.10 kg / 0.22 pounds
406 Gs
0.02 kg / 0.03 pounds
15 g / 0.1 N
 0.09 kg / 0.20 pounds
~0 Gs
70 mm 0.05 kg / 0.12 pounds
293 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.10 pounds
~0 Gs
80 mm 0.03 kg / 0.06 pounds
217 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
165 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
128 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a larger range of operation. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Estimates demonstrate sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
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
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 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 serious hazard to IT equipment as well as medical implants. These neodymiums generate a field that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
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 prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Thermal stability

*For N38 grade, the max working temp 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.

Engineering data and GPSR
Chemical composition
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: 020149-2026
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Component MPL 40x10x18 / 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 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.
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 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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 18 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 16.72 kg (force ~164.01 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain attractive force for nearly ten years – the loss is just ~1% (in theory),
  • They feature excellent resistance to magnetism drop when exposed to external magnetic sources,
  • In other words, due to the reflective finish of gold, the element becomes visually attractive,
  • Magnetic induction on the surface of the magnet is impressive,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in constructing and the ability to modify to specific needs,
  • Versatile presence in electronics industry – they are commonly used in HDD drives, motor assemblies, advanced medical instruments, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • 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 protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making threads in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Pull force analysis

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

Breakaway force was defined for ideal contact conditions, including:
  • with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Please note that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Respect the power

Use magnets with awareness. Their immense force can surprise even experienced users. Stay alert and respect their power.

Finger safety

Danger of trauma: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Protect data

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Precision electronics

A strong magnetic field disrupts the operation of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent damaging the sensors.

Operating temperature

Control the heat. Heating the magnet to high heat will destroy its properties and strength.

Do not give to children

Adult use only. Small elements can be swallowed, causing severe trauma. Keep away from kids and pets.

Medical implants

Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Fire warning

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Material brittleness

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them shattering into shards.

Sensitization to coating

Certain individuals experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Prolonged contact may cause an allergic reaction. We suggest wear safety gloves.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?