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MPL 40x15x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020153

GTIN/EAN: 5906301811596

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

11.35 kg / 111.37 N

Magnetic Induction

249.11 mT / 2491 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

7.63 ZŁ with VAT / pcs + price for transport

6.20 ZŁ net + 23% VAT / pcs

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Give us a call +48 22 499 98 98 if you prefer send us a note through inquiry form the contact form page.
Specifications and shape of neodymium magnets can be analyzed using our force calculator.

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Technical parameters of the product - MPL 40x15x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020153
GTIN/EAN 5906301811596
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 15 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.35 kg / 111.37 N
Magnetic Induction ~ ? 249.11 mT / 2491 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x5 / 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 simulation of the product - data

These values constitute the direct effect of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 40x15x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2490 Gs
249.0 mT
 11.35 kg / 25.02 pounds
11350.0 g / 111.3 N
 crushing
1 mm 2306 Gs
230.6 mT
 9.73 kg / 21.45 pounds
9731.3 g / 95.5 N
 strong
2 mm 2095 Gs
209.5 mT
 8.03 kg / 17.70 pounds
8028.8 g / 78.8 N
 strong
3 mm 1877 Gs
187.7 mT
 6.45 kg / 14.21 pounds
6445.4 g / 63.2 N
 strong
5 mm 1472 Gs
147.2 mT
 3.97 kg / 8.74 pounds
3965.1 g / 38.9 N
 strong
10 mm 792 Gs
79.2 mT
 1.15 kg / 2.53 pounds
1147.1 g / 11.3 N
 safe
15 mm 454 Gs
45.4 mT
 0.38 kg / 0.83 pounds
376.9 g / 3.7 N
 safe
20 mm 278 Gs
27.8 mT
 0.14 kg / 0.31 pounds
141.4 g / 1.4 N
 safe
30 mm 122 Gs
12.2 mT
 0.03 kg / 0.06 pounds
27.0 g / 0.3 N
 safe
50 mm 35 Gs
3.5 mT
 0.00 kg / 0.01 pounds
2.3 g / 0.0 N
 safe
Pulling power drops sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, paint, rust) significantly diminishes the holding power. Magnets operate most effectively in perfect adhesion; air break weakens the force. See how flashily the pull force fall, when the product does not adhere flatly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Sliding load (wall)
MPL 40x15x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.27 kg / 5.00 pounds
2270.0 g / 22.3 N
1 mm Stal (~0.2) 1.95 kg / 4.29 pounds
1946.0 g / 19.1 N
2 mm Stal (~0.2) 1.61 kg / 3.54 pounds
1606.0 g / 15.8 N
3 mm Stal (~0.2) 1.29 kg / 2.84 pounds
1290.0 g / 12.7 N
5 mm Stal (~0.2) 0.79 kg / 1.75 pounds
794.0 g / 7.8 N
10 mm Stal (~0.2) 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
15 mm Stal (~0.2) 0.08 kg / 0.17 pounds
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data presents the estimated force sufficient to start the downward movement of the magnet vertically along a upright metal surface (considering standard friction). This value is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x15x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.41 kg / 7.51 pounds
3405.0 g / 33.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.27 kg / 5.00 pounds
2270.0 g / 22.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.14 kg / 2.50 pounds
1135.0 g / 11.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.68 kg / 12.51 pounds
5675.0 g / 55.7 N
When placing a holder on a vertical wall (e.g., a car body), it will maintain only approx. 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip cause that magnets move down faster than they pop off the substrate. Designing a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter load. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x15x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.57 kg / 1.25 pounds
567.5 g / 5.6 N
1 mm
13%
 1.42 kg / 3.13 pounds
1418.8 g / 13.9 N
2 mm
25%
 2.84 kg / 6.26 pounds
2837.5 g / 27.8 N
3 mm
38%
 4.26 kg / 9.38 pounds
4256.3 g / 41.8 N
5 mm
63%
 7.09 kg / 15.64 pounds
7093.8 g / 69.6 N
10 mm
100%
 11.35 kg / 25.02 pounds
11350.0 g / 111.3 N
11 mm
100%
 11.35 kg / 25.02 pounds
11350.0 g / 111.3 N
12 mm
100%
 11.35 kg / 25.02 pounds
11350.0 g / 111.3 N
A thin sheet is unable to conduct the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To utilize the maximum of this magnet's power, you need a suitably thick backing of steel. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MPL 40x15x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.35 kg / 25.02 pounds
11350.0 g / 111.3 N
 OK
40 °C -2.2% 11.10 kg / 24.47 pounds
11100.3 g / 108.9 N
 OK
60 °C -4.4% 10.85 kg / 23.92 pounds
10850.6 g / 106.4 N
80 °C -6.6% 10.60 kg / 23.37 pounds
10600.9 g / 104.0 N
100 °C -28.8% 8.08 kg / 17.82 pounds
8081.2 g / 79.3 N
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this product. With increasing heat, the neodymium's power momentarily decreases. Refrain from using this product near heat sources exceeding its safe range. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 40x15x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.94 kg / 50.58 pounds
3 961 Gs
3.44 kg / 7.59 pounds
3441 g / 33.8 N
 N/A
1 mm 21.37 kg / 47.11 pounds
4 807 Gs
3.21 kg / 7.07 pounds
3205 g / 31.4 N
 19.23 kg / 42.40 pounds
~0 Gs
2 mm 19.67 kg / 43.37 pounds
4 612 Gs
2.95 kg / 6.50 pounds
2951 g / 28.9 N
 17.70 kg / 39.03 pounds
~0 Gs
3 mm 17.94 kg / 39.55 pounds
4 404 Gs
2.69 kg / 5.93 pounds
2691 g / 26.4 N
 16.15 kg / 35.59 pounds
~0 Gs
5 mm 14.58 kg / 32.15 pounds
3 971 Gs
2.19 kg / 4.82 pounds
2187 g / 21.5 N
 13.12 kg / 28.93 pounds
~0 Gs
10 mm 8.01 kg / 17.67 pounds
2 944 Gs
1.20 kg / 2.65 pounds
1202 g / 11.8 N
 7.21 kg / 15.90 pounds
~0 Gs
20 mm 2.32 kg / 5.11 pounds
1 583 Gs
0.35 kg / 0.77 pounds
348 g / 3.4 N
 2.09 kg / 4.60 pounds
~0 Gs
50 mm 0.12 kg / 0.26 pounds
359 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
60 mm 0.05 kg / 0.12 pounds
243 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
70 mm 0.03 kg / 0.06 pounds
171 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
80 mm 0.01 kg / 0.03 pounds
124 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
92 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
70 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The repulsion force is marginally weaker than the connection force, but still large.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
* Calculations refer to friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MPL 40x15x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Timepiece 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a serious hazard to electronic devices and medical implants. These magnets produce a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MPL 40x15x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.04 km/h
(6.68 m/s)
 0.50 J
30 mm 39.29 km/h
(10.91 m/s)
 1.34 J
50 mm 50.66 km/h
(14.07 m/s)
 2.23 J
100 mm 71.63 km/h
(19.90 m/s)
 4.45 J
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Surface protection spec
MPL 40x15x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 40x15x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 40x15x5 / N38

Environment Effective steel pull Effect
Air (land) 11.35 kg Standard
Water (riverbed) 13.00 kg
(+1.65 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.
Water displaces steel, making heavy objects slightly lighter. 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 a fraction of its max power.

2. Steel thickness impact

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

3. Power loss vs temp

*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) = 0.26

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
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: 020153-2026
Quick Unit Converter
Pulling force
Magnetic Induction
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Model MPL 40x15x5 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 111.37 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 11.35 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 11.35 kg), they are ideal as closers 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. 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 (40x15 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x15x5 mm, which, at a weight of 22.5 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x15x5 mm and a self-weight of 22.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for almost 10 years – the drop is just ~1% (according to analyses),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • By using a reflective layer of gold, the element acquires an professional look,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • 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 modularity in forming and the ability to customize to individual projects,
  • Versatile presence in modern technologies – they are commonly used in mass storage devices, brushless drives, medical equipment, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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 corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Holding efficiency impacted by working environment parameters, such as (from most important):
  • Air gap (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Base massiveness – too thin sheet does not close the flux, causing part of the flux to be escaped into the air.
  • Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Do not overheat magnets

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Bodily injuries

Mind your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Be careful!

Immense force

Use magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their force.

Keep away from electronics

Be aware: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and GPS.

Magnet fragility

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Danger to pacemakers

For implant holders: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Swallowing risk

Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Store away from children and animals.

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose encased magnets.

Combustion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Data carriers

Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?