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MPL 100x40x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020109

GTIN/EAN: 5906301811152

5.00

length

100 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

600 g

Magnetization Direction

↑ axial

Load capacity

120.01 kg / 1177.33 N

Magnetic Induction

337.24 mT / 3372 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

335.30 ZŁ with VAT / pcs + price for transport

272.60 ZŁ net + 23% VAT / pcs

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Technical - MPL 100x40x20 / N38 - lamellar magnet

Specification / characteristics - MPL 100x40x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020109
GTIN/EAN 5906301811152
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 100 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 600 g
Magnetization Direction ↑ axial
Load capacity ~ ? 120.01 kg / 1177.33 N
Magnetic Induction ~ ? 337.24 mT / 3372 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 100x40x20 / 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 product - data

The following data are the direct effect of a engineering simulation. Values were calculated on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these data as a reference point when designing systems.

Table 1: Static force (pull vs gap) - power drop
MPL 100x40x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3372 Gs
337.2 mT
 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
 dangerous!
1 mm 3268 Gs
326.8 mT
 112.70 kg / 248.45 lbs
112695.4 g / 1105.5 N
 dangerous!
2 mm 3158 Gs
315.8 mT
 105.27 kg / 232.09 lbs
105272.6 g / 1032.7 N
 dangerous!
3 mm 3046 Gs
304.6 mT
 97.92 kg / 215.88 lbs
97921.3 g / 960.6 N
 dangerous!
5 mm 2818 Gs
281.8 mT
 83.78 kg / 184.71 lbs
83783.3 g / 821.9 N
 dangerous!
10 mm 2266 Gs
226.6 mT
 54.17 kg / 119.43 lbs
54174.5 g / 531.5 N
 dangerous!
15 mm 1794 Gs
179.4 mT
 33.96 kg / 74.86 lbs
33955.7 g / 333.1 N
 dangerous!
20 mm 1419 Gs
141.9 mT
 21.25 kg / 46.84 lbs
21248.1 g / 208.4 N
 dangerous!
30 mm 908 Gs
90.8 mT
 8.70 kg / 19.17 lbs
8696.3 g / 85.3 N
 warning
50 mm 416 Gs
41.6 mT
 1.83 kg / 4.02 lbs
1825.4 g / 17.9 N
 weak grip
Pulling power decreases drastically per each millimeter of spacing. Note that even a very thin break (e.g., dirt, varnish, rust) significantly weakens the grip. Neodymiums hold optimally during direct contact; distance nullifies the force. Observe how rapidly the parameters plummet, when the magnet does not adhere directly to the steel surface. When designing the assembly, discard redundant distances.

Table 2: Shear capacity (vertical surface)
MPL 100x40x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 24.00 kg / 52.92 lbs
24002.0 g / 235.5 N
1 mm Stal (~0.2) 22.54 kg / 49.69 lbs
22540.0 g / 221.1 N
2 mm Stal (~0.2) 21.05 kg / 46.42 lbs
21054.0 g / 206.5 N
3 mm Stal (~0.2) 19.58 kg / 43.18 lbs
19584.0 g / 192.1 N
5 mm Stal (~0.2) 16.76 kg / 36.94 lbs
16756.0 g / 164.4 N
10 mm Stal (~0.2) 10.83 kg / 23.88 lbs
10834.0 g / 106.3 N
15 mm Stal (~0.2) 6.79 kg / 14.97 lbs
6792.0 g / 66.6 N
20 mm Stal (~0.2) 4.25 kg / 9.37 lbs
4250.0 g / 41.7 N
30 mm Stal (~0.2) 1.74 kg / 3.84 lbs
1740.0 g / 17.1 N
50 mm Stal (~0.2) 0.37 kg / 0.81 lbs
366.0 g / 3.6 N
The following data presents the theoretical force needed to initiate the sliding of the magnet vertically against a upright steel plate (considering typical friction coefficient). This value varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 100x40x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
36.00 kg / 79.37 lbs
36003.0 g / 353.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
24.00 kg / 52.92 lbs
24002.0 g / 235.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
12.00 kg / 26.46 lbs
12001.0 g / 117.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
60.01 kg / 132.29 lbs
60005.0 g / 588.6 N
When mounting a element on a upright wall (e.g., a car body), it will maintain only approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip cause that products slide down faster than they pull off. Want to create a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller weight. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 100x40x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 4.00 kg / 8.82 lbs
4000.3 g / 39.2 N
1 mm
8%
 10.00 kg / 22.05 lbs
10000.8 g / 98.1 N
2 mm
17%
 20.00 kg / 44.10 lbs
20001.7 g / 196.2 N
3 mm
25%
 30.00 kg / 66.14 lbs
30002.5 g / 294.3 N
5 mm
42%
 50.00 kg / 110.24 lbs
50004.2 g / 490.5 N
10 mm
83%
 100.01 kg / 220.48 lbs
100008.3 g / 981.1 N
11 mm
92%
 110.01 kg / 242.53 lbs
110009.2 g / 1079.2 N
12 mm
100%
 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
A thin metal plate is unable to focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the product works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Working in heat (stability) - power drop
MPL 100x40x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
 OK
40 °C -2.2% 117.37 kg / 258.76 lbs
117369.8 g / 1151.4 N
 OK
60 °C -4.4% 114.73 kg / 252.94 lbs
114729.6 g / 1125.5 N
80 °C -6.6% 112.09 kg / 247.11 lbs
112089.3 g / 1099.6 N
100 °C -28.8% 85.45 kg / 188.38 lbs
85447.1 g / 838.2 N
Ordinary NdFeB products lose parameters past the thermal threshold. Avoid high temperatures – high temperature can irreversibly destroy this magnet. With increasing heat, the magnet's force momentarily drops. Refrain from using this product near heat sources exceeding its safe range. Ignoring the limit will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 100x40x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 280.40 kg / 618.18 lbs
4 790 Gs
42.06 kg / 92.73 lbs
42060 g / 412.6 N
 N/A
1 mm 271.97 kg / 599.59 lbs
6 642 Gs
40.80 kg / 89.94 lbs
40796 g / 400.2 N
 244.77 kg / 539.63 lbs
~0 Gs
2 mm 263.31 kg / 580.50 lbs
6 535 Gs
39.50 kg / 87.08 lbs
39497 g / 387.5 N
 236.98 kg / 522.45 lbs
~0 Gs
3 mm 254.63 kg / 561.37 lbs
6 427 Gs
38.20 kg / 84.21 lbs
38195 g / 374.7 N
 229.17 kg / 505.24 lbs
~0 Gs
5 mm 237.35 kg / 523.26 lbs
6 205 Gs
35.60 kg / 78.49 lbs
35602 g / 349.3 N
 213.61 kg / 470.93 lbs
~0 Gs
10 mm 195.76 kg / 431.58 lbs
5 635 Gs
29.36 kg / 64.74 lbs
29364 g / 288.1 N
 176.18 kg / 388.42 lbs
~0 Gs
20 mm 126.58 kg / 279.06 lbs
4 531 Gs
18.99 kg / 41.86 lbs
18987 g / 186.3 N
 113.92 kg / 251.15 lbs
~0 Gs
50 mm 31.47 kg / 69.38 lbs
2 259 Gs
4.72 kg / 10.41 lbs
4721 g / 46.3 N
 28.32 kg / 62.44 lbs
~0 Gs
60 mm 20.32 kg / 44.80 lbs
1 815 Gs
3.05 kg / 6.72 lbs
3048 g / 29.9 N
 18.29 kg / 40.32 lbs
~0 Gs
70 mm 13.38 kg / 29.50 lbs
1 473 Gs
2.01 kg / 4.42 lbs
2007 g / 19.7 N
 12.04 kg / 26.55 lbs
~0 Gs
80 mm 8.98 kg / 19.80 lbs
1 207 Gs
1.35 kg / 2.97 lbs
1347 g / 13.2 N
 8.08 kg / 17.82 lbs
~0 Gs
90 mm 6.14 kg / 13.53 lbs
998 Gs
0.92 kg / 2.03 lbs
920 g / 9.0 N
 5.52 kg / 12.18 lbs
~0 Gs
100 mm 4.27 kg / 9.40 lbs
832 Gs
0.64 kg / 1.41 lbs
640 g / 6.3 N
 3.84 kg / 8.46 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 action. Designing a strong closure? Use a pair of magnets instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the pinch force is massive. The levitation is marginally weaker than the connection force, but still impressive.
*Field value between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Figures show friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MPL 100x40x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 30.5 cm
Hearing aid 10 Gs (1.0 mT) 24.0 cm
Timepiece 20 Gs (2.0 mT) 18.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 14.5 cm
Remote 50 Gs (5.0 mT) 13.5 cm
Payment card 400 Gs (40.0 mT) 5.5 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm
Extremely neodym field poses a real danger to IT equipment and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 100x40x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.84 km/h
(4.96 m/s)
 7.37 J
30 mm 25.80 km/h
(7.17 m/s)
 15.41 J
50 mm 32.20 km/h
(8.94 m/s)
 23.99 J
100 mm 45.13 km/h
(12.54 m/s)
 47.14 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can cause material chips or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MPL 100x40x20 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MPL 100x40x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 131 922 Mx 1319.2 µWb
Pc Coefficient 0.38 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 100x40x20 / N38

Environment Effective steel pull Effect
Air (land) 120.01 kg Standard
Water (riverbed) 137.41 kg
(+17.40 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

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
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: 020109-2026
Magnet Unit Converter
Force (pull)
Field Strength
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 100x40x20 mm and a weight of 600 g, guarantees premium class connection. This magnetic block with a force of 1177.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, 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. Watch your fingers! Magnets with a force of 120.01 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. 120.01 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 100x40x20 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 100 mm (length), 40 mm (width), and 20 mm (thickness). It is a magnetic block with dimensions 100x40x20 mm and a self-weight of 600 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their notable power, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • In other words, due to the aesthetic surface of silver, the element becomes visually attractive,
  • Magnetic induction on the working layer of the magnet turns out to be very high,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of custom shaping as well as optimizing to atypical requirements,
  • Fundamental importance in high-tech industry – they are utilized in HDD drives, brushless drives, medical equipment, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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 mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

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

The lifting capacity listed is a result of laboratory testing conducted under standard conditions:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Key elements affecting lifting force

In practice, the real power is determined by many variables, presented from most significant:
  • Gap (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

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 lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Machining danger

Powder created during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Eye protection

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop working with magnets and use protective gear.

Handling rules

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Stay alert and respect their power.

Bone fractures

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Power loss in heat

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and strength.

Choking Hazard

Always store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are tragic.

ICD Warning

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

GPS and phone interference

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Threat to electronics

Intense magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Safety First! More info about risks in the article: Safety of working with magnets.