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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

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7.63 ZŁ with VAT / pcs + price for transport

6.20 ZŁ net + 23% VAT / pcs

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Technical data 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

Engineering simulation of the assembly - data

The following data constitute the direct effect of a physical simulation. Values rely on models for the class Nd2Fe14B. Actual performance may differ. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
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 lbs
11350.0 g / 111.3 N
 dangerous!
1 mm 2306 Gs
230.6 mT
 9.73 kg / 21.45 lbs
9731.3 g / 95.5 N
 warning
2 mm 2095 Gs
209.5 mT
 8.03 kg / 17.70 lbs
8028.8 g / 78.8 N
 warning
3 mm 1877 Gs
187.7 mT
 6.45 kg / 14.21 lbs
6445.4 g / 63.2 N
 warning
5 mm 1472 Gs
147.2 mT
 3.97 kg / 8.74 lbs
3965.1 g / 38.9 N
 warning
10 mm 792 Gs
79.2 mT
 1.15 kg / 2.53 lbs
1147.1 g / 11.3 N
 weak grip
15 mm 454 Gs
45.4 mT
 0.38 kg / 0.83 lbs
376.9 g / 3.7 N
 weak grip
20 mm 278 Gs
27.8 mT
 0.14 kg / 0.31 lbs
141.4 g / 1.4 N
 weak grip
30 mm 122 Gs
12.2 mT
 0.03 kg / 0.06 lbs
27.0 g / 0.3 N
 weak grip
50 mm 35 Gs
3.5 mT
 0.00 kg / 0.01 lbs
2.3 g / 0.0 N
 weak grip
Grip strength decreases significantly with every mm of spacing. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Magnets operate strongest in perfect adhesion; distance kills the power. Observe how rapidly the parameters plummet, when the product does not adhere flatly to the metal substrate. When planning the assembly, discard redundant distances.

Table 2: Vertical force (wall)
MPL 40x15x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.27 kg / 5.00 lbs
2270.0 g / 22.3 N
1 mm Stal (~0.2) 1.95 kg / 4.29 lbs
1946.0 g / 19.1 N
2 mm Stal (~0.2) 1.61 kg / 3.54 lbs
1606.0 g / 15.8 N
3 mm Stal (~0.2) 1.29 kg / 2.84 lbs
1290.0 g / 12.7 N
5 mm Stal (~0.2) 0.79 kg / 1.75 lbs
794.0 g / 7.8 N
10 mm Stal (~0.2) 0.23 kg / 0.51 lbs
230.0 g / 2.3 N
15 mm Stal (~0.2) 0.08 kg / 0.17 lbs
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data indicates the estimated weight limit needed to start the sliding of the magnet down against a vertical steel wall (considering standard friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 lbs
3405.0 g / 33.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.27 kg / 5.00 lbs
2270.0 g / 22.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.14 kg / 2.50 lbs
1135.0 g / 11.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.68 kg / 12.51 lbs
5675.0 g / 55.7 N
When hanging a magnet on a upright wall (e.g., a fridge), it you can count on only about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that products slip faster than they detach. Want to create a vertical fastening? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slide down under a much lighter load. Using a rubber pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - 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 lbs
567.5 g / 5.6 N
1 mm
13%
 1.42 kg / 3.13 lbs
1418.8 g / 13.9 N
2 mm
25%
 2.84 kg / 6.26 lbs
2837.5 g / 27.8 N
3 mm
38%
 4.26 kg / 9.38 lbs
4256.3 g / 41.8 N
5 mm
63%
 7.09 kg / 15.64 lbs
7093.8 g / 69.6 N
10 mm
100%
 11.35 kg / 25.02 lbs
11350.0 g / 111.3 N
11 mm
100%
 11.35 kg / 25.02 lbs
11350.0 g / 111.3 N
12 mm
100%
 11.35 kg / 25.02 lbs
11350.0 g / 111.3 N
A thin metal plate is not enough to conduct the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect causes that on delicate walls (e.g., appliance housings), the magnet works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 40x15x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.35 kg / 25.02 lbs
11350.0 g / 111.3 N
 OK
40 °C -2.2% 11.10 kg / 24.47 lbs
11100.3 g / 108.9 N
 OK
60 °C -4.4% 10.85 kg / 23.92 lbs
10850.6 g / 106.4 N
80 °C -6.6% 10.60 kg / 23.37 lbs
10600.9 g / 104.0 N
100 °C -28.8% 8.08 kg / 17.82 lbs
8081.2 g / 79.3 N
Ordinary NdFeB products lose strength past the thermal threshold. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the neodymium's power briefly lowers. Refrain from using this magnet in hot environments higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.94 kg / 50.58 lbs
3 961 Gs
3.44 kg / 7.59 lbs
3441 g / 33.8 N
 N/A
1 mm 21.37 kg / 47.11 lbs
4 807 Gs
3.21 kg / 7.07 lbs
3205 g / 31.4 N
 19.23 kg / 42.40 lbs
~0 Gs
2 mm 19.67 kg / 43.37 lbs
4 612 Gs
2.95 kg / 6.50 lbs
2951 g / 28.9 N
 17.70 kg / 39.03 lbs
~0 Gs
3 mm 17.94 kg / 39.55 lbs
4 404 Gs
2.69 kg / 5.93 lbs
2691 g / 26.4 N
 16.15 kg / 35.59 lbs
~0 Gs
5 mm 14.58 kg / 32.15 lbs
3 971 Gs
2.19 kg / 4.82 lbs
2187 g / 21.5 N
 13.12 kg / 28.93 lbs
~0 Gs
10 mm 8.01 kg / 17.67 lbs
2 944 Gs
1.20 kg / 2.65 lbs
1202 g / 11.8 N
 7.21 kg / 15.90 lbs
~0 Gs
20 mm 2.32 kg / 5.11 lbs
1 583 Gs
0.35 kg / 0.77 lbs
348 g / 3.4 N
 2.09 kg / 4.60 lbs
~0 Gs
50 mm 0.12 kg / 0.26 lbs
359 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
60 mm 0.05 kg / 0.12 lbs
243 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
70 mm 0.03 kg / 0.06 lbs
171 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
80 mm 0.01 kg / 0.03 lbs
124 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
92 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
70 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and sheet combination. The setup of two magnets produces a massive flux and a further horizon of operation. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Estimates refer to friction force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Remote 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
Extremely neodym field is a serious hazard to IT equipment and medical implants. These magnets produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
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 very brittle – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Warning: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.26

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 and environmental data
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%
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: 020153-2026
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Model MPL 40x15x5 / N38 features a flat shape and industrial 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 secures 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 40x15x5 / 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. 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. 11.35 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x15x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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 high energy density. The key parameter here is the lifting capacity amounting to approximately 11.35 kg (force ~111.37 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose strength, even after nearly 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by external interference,
  • Thanks to the smooth finish, the plating of nickel, gold, or silver-plated gives an visually attractive appearance,
  • Magnets have maximum magnetic induction on the active area,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in forming and the ability to customize to specific needs,
  • Key role in modern technologies – they are used in HDD drives, electromotive mechanisms, diagnostic systems, as well as modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these products can disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown concerns the peak performance, recorded under laboratory conditions, namely:
  • using a base made of high-permeability steel, functioning as a magnetic yoke
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without paint)
  • during pulling in a direction vertical to the mounting surface
  • in stable room temperature

Lifting capacity in real conditions – factors

Please note that the application force may be lower subject to the following factors, starting with the most relevant:
  • Gap (betwixt the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Load vector – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

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

Warnings
Conscious usage

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

Pacemakers

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, prevent direct skin contact or opt for coated magnets.

Magnet fragility

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

GPS and phone interference

A strong magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Mechanical processing

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

Adults only

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.

Electronic hazard

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Hand protection

Mind your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying anything in their path. Be careful!

Maximum temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?