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MPL 40x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020152

GTIN/EAN: 5906301811589

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

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6.03 ZŁ with VAT / pcs + price for transport

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Physical properties - MPL 40x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020152
GTIN/EAN 5906301811589
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 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5 / 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 analysis of the magnet - data

Presented information constitute the outcome of a engineering analysis. Values are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Please consider these data as a reference point for designers.

Table 1: Static force (force vs gap) - interaction chart
MPL 40x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 dangerous!
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
 medium risk
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 pounds
6384.9 g / 62.6 N
 medium risk
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 pounds
4432.4 g / 43.5 N
 medium risk
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 pounds
2122.9 g / 20.8 N
 medium risk
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 pounds
434.1 g / 4.3 N
 low risk
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 pounds
124.5 g / 1.2 N
 low risk
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 pounds
43.9 g / 0.4 N
 low risk
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
 low risk
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 low risk
Magnetic force drops sharply with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) strongly reduces the pull force. Magnets work most effectively at the point of direct contact; gap weakens the force. See how quickly the pull force drop, when the magnet does not touch flatly to the metal substrate. When designing the assembly, avoid unnecessary gaps.

Table 2: Shear load (wall)
MPL 40x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 pounds
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 pounds
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below shows the estimated shear load necessary to initiate the downward movement of the magnet down on a upright metal surface (assuming typical friction). This parameter is relative to the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 40x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 pounds
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 pounds
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 pounds
5925.0 g / 58.1 N
When mounting a element on a upright surface (e.g., a fridge), it will only hold only about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip cause that holders slip easier than they detach. Designing a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slip down under a much lighter load. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 pounds
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 pounds
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 pounds
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 pounds
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 pounds
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
A thin sheet is not enough to conduct the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the product works worse. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 pounds
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 pounds
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 pounds
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 pounds
8437.2 g / 82.8 N
Ordinary NdFeB products lose strength above the temperature limit. Protect against heat – excessive heat can permanently damage this magnet. With increasing heat, the magnet's force temporarily drops. Refrain from using this product close to ovens exceeding its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 40x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 pounds
4 569 Gs
3.82 kg / 8.41 pounds
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 pounds
6 018 Gs
3.35 kg / 7.38 pounds
3349 g / 32.9 N
 20.09 kg / 44.30 pounds
~0 Gs
2 mm 19.21 kg / 42.36 pounds
5 582 Gs
2.88 kg / 6.35 pounds
2882 g / 28.3 N
 17.29 kg / 38.12 pounds
~0 Gs
3 mm 16.31 kg / 35.96 pounds
5 144 Gs
2.45 kg / 5.39 pounds
2447 g / 24.0 N
 14.68 kg / 32.36 pounds
~0 Gs
5 mm 11.45 kg / 25.23 pounds
4 309 Gs
1.72 kg / 3.78 pounds
1717 g / 16.8 N
 10.30 kg / 22.71 pounds
~0 Gs
10 mm 4.56 kg / 10.05 pounds
2 719 Gs
0.68 kg / 1.51 pounds
684 g / 6.7 N
 4.10 kg / 9.04 pounds
~0 Gs
20 mm 0.93 kg / 2.05 pounds
1 230 Gs
0.14 kg / 0.31 pounds
140 g / 1.4 N
 0.84 kg / 1.85 pounds
~0 Gs
50 mm 0.04 kg / 0.08 pounds
249 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.08 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
167 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
48 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets attract each other from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a powerful holder? Apply two magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
* Calculations show friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MPL 40x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a large risk to IT equipment as well as pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and housings. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MPL 40x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.49 J
30 mm 49.12 km/h
(13.64 m/s)
 1.40 J
50 mm 63.39 km/h
(17.61 m/s)
 2.33 J
100 mm 89.64 km/h
(24.90 m/s)
 4.65 J
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or injury to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Corrosion resistance
MPL 40x10x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 40x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MPL 40x10x5 / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 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. 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 just ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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: 020152-2026
Magnet Unit Converter
Magnet pull force
Field Strength
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Component MPL 40x10x5 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 11.85 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 11.85 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. They work great as invisible mounts under tiles, wood, or glass. 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 40x10x5 / N38, we recommend utilizing two-component adhesives (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.
Standardly, the MPL 40x10x5 / N38 model is magnetized axially (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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x10x5 mm, which, at a weight of 15 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 11.85 kg (force ~116.27 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength is durable, and after around 10 years it drops only by ~1% (according to research),
  • Neodymium magnets are highly resistant to demagnetization caused by external magnetic fields,
  • Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
  • Magnetic induction on the top side of the magnet remains impressive,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the ability to customize to complex applications,
  • Key role in advanced technology sectors – they find application in data components, drive modules, medical equipment, as well as modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices can disrupt the diagnostic process 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

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

The specified lifting capacity concerns the maximum value, recorded under optimal environment, meaning:
  • with the application of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an polished contact surface
  • with zero gap (no paint)
  • under perpendicular application of breakaway force (90-degree angle)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Please note that the application force may be lower depending on the following factors, in order of importance:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Risk of cracking

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Serious injuries

Big blocks can break fingers instantly. Do not place your hand between two attracting surfaces.

Heat warning

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Allergy Warning

It is widely known that nickel (the usual finish) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and choose versions in plastic housing.

Warning for heart patients

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

Electronic hazard

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

Machining danger

Powder created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Compass and GPS

Navigation devices and smartphones are extremely susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

No play value

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are fatal.

Handling guide

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

Caution! Need more info? Check our post: Why are neodymium magnets dangerous?