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MPL 40x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020158

GTIN/EAN: 5906301811640

Load capacity 24.62 kg / 241.53 N Magnetic Induction 349.60 mT / 3496 Gs
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
60 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical specifications »

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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical specification - MPL 40x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020158
GTIN/EAN 5906301811640
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 20 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 60 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.62 kg / 241.53 N
Magnetic Induction ~ ? 349.60 mT / 3496 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x10 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 modeling of the product - report

The following information constitute the result of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 40x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3495 Gs
349.5 mT
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
 crushing
1 mm 3272 Gs
327.2 mT
 21.58 kg / 47.57 lbs
21578.0 g / 211.7 N
 crushing
2 mm 3035 Gs
303.5 mT
 18.56 kg / 40.92 lbs
18559.3 g / 182.1 N
 crushing
3 mm 2794 Gs
279.4 mT
 15.73 kg / 34.69 lbs
15733.0 g / 154.3 N
 crushing
5 mm 2332 Gs
233.2 mT
 10.96 kg / 24.16 lbs
10959.2 g / 107.5 N
 crushing
10 mm 1433 Gs
143.3 mT
 4.14 kg / 9.12 lbs
4136.4 g / 40.6 N
 strong
15 mm 891 Gs
89.1 mT
 1.60 kg / 3.52 lbs
1598.7 g / 15.7 N
 low risk
20 mm 574 Gs
57.4 mT
 0.66 kg / 1.46 lbs
664.0 g / 6.5 N
 low risk
30 mm 267 Gs
26.7 mT
 0.14 kg / 0.32 lbs
143.7 g / 1.4 N
 low risk
50 mm 82 Gs
8.2 mT
 0.01 kg / 0.03 lbs
13.7 g / 0.1 N
 low risk
Pulling power decreases sharply with every subsequent millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) noticeably reduces the pull force. Magnets hold most effectively during direct contact; air break drastically cuts the power. Analyze how flashily the parameters fall, when the product does not adhere directly to the steel surface. When calculating the assembly, discard additional spacers.

Table 2: Slippage capacity (vertical surface)
MPL 40x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
1 mm Stal (~0.2) 4.32 kg / 9.52 lbs
4316.0 g / 42.3 N
2 mm Stal (~0.2) 3.71 kg / 8.18 lbs
3712.0 g / 36.4 N
3 mm Stal (~0.2) 3.15 kg / 6.94 lbs
3146.0 g / 30.9 N
5 mm Stal (~0.2) 2.19 kg / 4.83 lbs
2192.0 g / 21.5 N
10 mm Stal (~0.2) 0.83 kg / 1.83 lbs
828.0 g / 8.1 N
15 mm Stal (~0.2) 0.32 kg / 0.71 lbs
320.0 g / 3.1 N
20 mm Stal (~0.2) 0.13 kg / 0.29 lbs
132.0 g / 1.3 N
30 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The following data indicates the approximate weight limit required to start the slippage of the magnet downwards against a upright steel wall (assuming standard friction coefficient). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.39 kg / 16.28 lbs
7386.0 g / 72.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.92 kg / 10.86 lbs
4924.0 g / 48.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.46 kg / 5.43 lbs
2462.0 g / 24.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.31 kg / 27.14 lbs
12310.0 g / 120.8 N
When placing a holder on a upright surface (e.g., a fridge), it will maintain only approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that holders slide down easier than they detach. Want to create a vertical fastening? Consider that the shear force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slip down under a much lighter cargo. Application of an anti-slip coating can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.23 kg / 2.71 lbs
1231.0 g / 12.1 N
1 mm
13%
 3.08 kg / 6.78 lbs
3077.5 g / 30.2 N
2 mm
25%
 6.16 kg / 13.57 lbs
6155.0 g / 60.4 N
3 mm
38%
 9.23 kg / 20.35 lbs
9232.5 g / 90.6 N
5 mm
63%
 15.39 kg / 33.92 lbs
15387.5 g / 151.0 N
10 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
11 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
12 mm
100%
 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
A too thin steel is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal stability (stability) - power drop
MPL 40x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.62 kg / 54.28 lbs
24620.0 g / 241.5 N
 OK
40 °C -2.2% 24.08 kg / 53.08 lbs
24078.4 g / 236.2 N
 OK
60 °C -4.4% 23.54 kg / 51.89 lbs
23536.7 g / 230.9 N
80 °C -6.6% 23.00 kg / 50.70 lbs
22995.1 g / 225.6 N
100 °C -28.8% 17.53 kg / 38.65 lbs
17529.4 g / 172.0 N
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly destroy this product. With every degree above norm, the neodymium's force briefly lowers. Do not use this product close to ovens higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 60.25 kg / 132.83 lbs
4 926 Gs
9.04 kg / 19.93 lbs
9038 g / 88.7 N
 N/A
1 mm 56.58 kg / 124.73 lbs
6 774 Gs
8.49 kg / 18.71 lbs
8487 g / 83.3 N
 50.92 kg / 112.26 lbs
~0 Gs
2 mm 52.81 kg / 116.42 lbs
6 544 Gs
7.92 kg / 17.46 lbs
7921 g / 77.7 N
 47.53 kg / 104.78 lbs
~0 Gs
3 mm 49.07 kg / 108.19 lbs
6 309 Gs
7.36 kg / 16.23 lbs
7361 g / 72.2 N
 44.17 kg / 97.37 lbs
~0 Gs
5 mm 41.89 kg / 92.34 lbs
5 828 Gs
6.28 kg / 13.85 lbs
6283 g / 61.6 N
 37.70 kg / 83.11 lbs
~0 Gs
10 mm 26.82 kg / 59.13 lbs
4 664 Gs
4.02 kg / 8.87 lbs
4023 g / 39.5 N
 24.14 kg / 53.22 lbs
~0 Gs
20 mm 10.12 kg / 22.32 lbs
2 865 Gs
1.52 kg / 3.35 lbs
1518 g / 14.9 N
 9.11 kg / 20.09 lbs
~0 Gs
50 mm 0.73 kg / 1.61 lbs
769 Gs
0.11 kg / 0.24 lbs
109 g / 1.1 N
 0.66 kg / 1.45 lbs
~0 Gs
60 mm 0.35 kg / 0.78 lbs
534 Gs
0.05 kg / 0.12 lbs
53 g / 0.5 N
 0.32 kg / 0.70 lbs
~0 Gs
70 mm 0.18 kg / 0.40 lbs
383 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
 0.16 kg / 0.36 lbs
~0 Gs
80 mm 0.10 kg / 0.22 lbs
282 Gs
0.01 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
90 mm 0.06 kg / 0.12 lbs
214 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
165 Gs
0.01 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.07 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and steel setup. Such a system of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Important: Estimates refer to shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MPL 40x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Timepiece 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Car key 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation poses a serious hazard to IT equipment as well as pacemakers. These magnets produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.73 km/h
(6.32 m/s)
 1.20 J
30 mm 24.69 km/h
(6.86 m/s)
 1.41 J
50 mm 24.78 km/h
(6.88 m/s)
 1.42 J
100 mm 24.79 km/h
(6.89 m/s)
 1.42 J
Magnetic elements are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Corrosion resistance
MPL 40x20x10 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 40x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 28 125 Mx 281.2 µWb
Pc Coefficient 0.42 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 40x20x10 / N38

Environment Effective steel pull Effect
Air (land) 24.62 kg Standard
Water (riverbed) 28.19 kg
(+3.57 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!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Shear force

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

2. Steel thickness impact

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Material specification

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

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: 020158-2026
Measurement Calculator

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even after around 10 years – the decrease in lifting capacity is only ~1% (theoretically),
  • They have excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • By covering with a smooth coating of silver, the element acquires an proper look,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed machining as well as adjusting to specific conditions,
  • Universal use in modern industrial fields – they are utilized in HDD drives, motor assemblies, precision medical tools, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making nuts in the magnet and complex forms - recommended is cover - magnet mounting.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small elements of these products can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • on a base made of mild steel, optimally conducting the magnetic field
  • whose transverse dimension is min. 10 mm
  • with a surface perfectly flat
  • with zero gap (no paint)
  • under axial force vector (90-degree angle)
  • in stable room temperature

Determinants of practical lifting force of a magnet

In practice, the actual holding force is determined by a number of factors, ranked from the most important:
  • Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may attract less.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Warning for heart patients

People with a heart stimulator should maintain an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.

Phone sensors

A strong magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Do not bring magnets near a smartphone to prevent damaging the sensors.

Permanent damage

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Product not for children

These products are not intended for children. Eating a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Finger safety

Big blocks can crush fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, avoid direct skin contact and choose encased magnets.

Combustion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Beware of splinters

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Handling rules

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Electronic hazard

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

Important! Learn more about hazards in the article: Magnet Safety Guide.