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MPL 100x40x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020109

GTIN/EAN: 5906301811152

5.00
Load capacity 120.01 kg / 1177.33 N Magnetic Induction 337.24 mT / 3372 Gs
length
100 mm [±0,1 mm]
Width
40 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
600 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check technical specifications »

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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.

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Technical of the product - 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

Technical modeling of the product - report

Presented information are the result of a physical simulation. Values rely on models for the material Nd2Fe14B. Actual performance may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
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 pounds
120010.0 g / 1177.3 N
 critical level
1 mm 3268 Gs
326.8 mT
 112.70 kg / 248.45 pounds
112695.4 g / 1105.5 N
 critical level
2 mm 3158 Gs
315.8 mT
 105.27 kg / 232.09 pounds
105272.6 g / 1032.7 N
 critical level
3 mm 3046 Gs
304.6 mT
 97.92 kg / 215.88 pounds
97921.3 g / 960.6 N
 critical level
5 mm 2818 Gs
281.8 mT
 83.78 kg / 184.71 pounds
83783.3 g / 821.9 N
 critical level
10 mm 2266 Gs
226.6 mT
 54.17 kg / 119.43 pounds
54174.5 g / 531.5 N
 critical level
15 mm 1794 Gs
179.4 mT
 33.96 kg / 74.86 pounds
33955.7 g / 333.1 N
 critical level
20 mm 1419 Gs
141.9 mT
 21.25 kg / 46.84 pounds
21248.1 g / 208.4 N
 critical level
30 mm 908 Gs
90.8 mT
 8.70 kg / 19.17 pounds
8696.3 g / 85.3 N
 warning
50 mm 416 Gs
41.6 mT
 1.83 kg / 4.02 pounds
1825.4 g / 17.9 N
 safe
Grip strength weakens sharply with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnets work optimally during direct contact; distance weakens the power. See how quickly the parameters plummet, when the product does not adhere directly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Shear load (wall)
MPL 100x40x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 24.00 kg / 52.92 pounds
24002.0 g / 235.5 N
1 mm Stal (~0.2) 22.54 kg / 49.69 pounds
22540.0 g / 221.1 N
2 mm Stal (~0.2) 21.05 kg / 46.42 pounds
21054.0 g / 206.5 N
3 mm Stal (~0.2) 19.58 kg / 43.18 pounds
19584.0 g / 192.1 N
5 mm Stal (~0.2) 16.76 kg / 36.94 pounds
16756.0 g / 164.4 N
10 mm Stal (~0.2) 10.83 kg / 23.88 pounds
10834.0 g / 106.3 N
15 mm Stal (~0.2) 6.79 kg / 14.97 pounds
6792.0 g / 66.6 N
20 mm Stal (~0.2) 4.25 kg / 9.37 pounds
4250.0 g / 41.7 N
30 mm Stal (~0.2) 1.74 kg / 3.84 pounds
1740.0 g / 17.1 N
50 mm Stal (~0.2) 0.37 kg / 0.81 pounds
366.0 g / 3.6 N
The following data calculates the estimated weight limit sufficient to start the shifting of the magnet down along a vertical steel wall (assuming typical friction). This parameter is relative to the air gap 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 pounds
36003.0 g / 353.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
24.00 kg / 52.92 pounds
24002.0 g / 235.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
12.00 kg / 26.46 pounds
12001.0 g / 117.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
60.01 kg / 132.29 pounds
60005.0 g / 588.6 N
When hanging a magnet on a vertical surface (e.g., a fridge), it you can count on only about 1/5 of its nominal power. Gravity and a low friction coefficient influence the fact that holders slide down easier than they pop off the substrate. Want to create a wall mount? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will slide down under a significantly smaller cargo. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 100x40x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 4.00 kg / 8.82 pounds
4000.3 g / 39.2 N
1 mm
8%
 10.00 kg / 22.05 pounds
10000.8 g / 98.1 N
2 mm
17%
 20.00 kg / 44.10 pounds
20001.7 g / 196.2 N
3 mm
25%
 30.00 kg / 66.14 pounds
30002.5 g / 294.3 N
5 mm
42%
 50.00 kg / 110.24 pounds
50004.2 g / 490.5 N
10 mm
83%
 100.01 kg / 220.48 pounds
100008.3 g / 981.1 N
11 mm
92%
 110.01 kg / 242.53 pounds
110009.2 g / 1079.2 N
12 mm
100%
 120.01 kg / 264.58 pounds
120010.0 g / 1177.3 N
A thin metal plate is unable to focus the full magnetic flux, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize the maximum of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet works worse. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MPL 100x40x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 120.01 kg / 264.58 pounds
120010.0 g / 1177.3 N
 OK
40 °C -2.2% 117.37 kg / 258.76 pounds
117369.8 g / 1151.4 N
 OK
60 °C -4.4% 114.73 kg / 252.94 pounds
114729.6 g / 1125.5 N
80 °C -6.6% 112.09 kg / 247.11 pounds
112089.3 g / 1099.6 N
100 °C -28.8% 85.45 kg / 188.38 pounds
85447.1 g / 838.2 N
Standard neodymium magnets change their properties parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently demagnetize this magnet. With increasing heat, the magnet's force momentarily lowers. Avoid using this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will result in permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 100x40x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 280.40 kg / 618.18 pounds
4 790 Gs
42.06 kg / 92.73 pounds
42060 g / 412.6 N
 N/A
1 mm 271.97 kg / 599.59 pounds
6 642 Gs
40.80 kg / 89.94 pounds
40796 g / 400.2 N
 244.77 kg / 539.63 pounds
~0 Gs
2 mm 263.31 kg / 580.50 pounds
6 535 Gs
39.50 kg / 87.08 pounds
39497 g / 387.5 N
 236.98 kg / 522.45 pounds
~0 Gs
3 mm 254.63 kg / 561.37 pounds
6 427 Gs
38.20 kg / 84.21 pounds
38195 g / 374.7 N
 229.17 kg / 505.24 pounds
~0 Gs
5 mm 237.35 kg / 523.26 pounds
6 205 Gs
35.60 kg / 78.49 pounds
35602 g / 349.3 N
 213.61 kg / 470.93 pounds
~0 Gs
10 mm 195.76 kg / 431.58 pounds
5 635 Gs
29.36 kg / 64.74 pounds
29364 g / 288.1 N
 176.18 kg / 388.42 pounds
~0 Gs
20 mm 126.58 kg / 279.06 pounds
4 531 Gs
18.99 kg / 41.86 pounds
18987 g / 186.3 N
 113.92 kg / 251.15 pounds
~0 Gs
50 mm 31.47 kg / 69.38 pounds
2 259 Gs
4.72 kg / 10.41 pounds
4721 g / 46.3 N
 28.32 kg / 62.44 pounds
~0 Gs
60 mm 20.32 kg / 44.80 pounds
1 815 Gs
3.05 kg / 6.72 pounds
3048 g / 29.9 N
 18.29 kg / 40.32 pounds
~0 Gs
70 mm 13.38 kg / 29.50 pounds
1 473 Gs
2.01 kg / 4.42 pounds
2007 g / 19.7 N
 12.04 kg / 26.55 pounds
~0 Gs
80 mm 8.98 kg / 19.80 pounds
1 207 Gs
1.35 kg / 2.97 pounds
1347 g / 13.2 N
 8.08 kg / 17.82 pounds
~0 Gs
90 mm 6.14 kg / 13.53 pounds
998 Gs
0.92 kg / 2.03 pounds
920 g / 9.0 N
 5.52 kg / 12.18 pounds
~0 Gs
100 mm 4.27 kg / 9.40 pounds
832 Gs
0.64 kg / 1.41 pounds
640 g / 6.3 N
 3.84 kg / 8.46 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a larger range of operation. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Figures apply to friction force of two identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
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
Mobile device 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
Powerful magnet radiation is a real danger to electronics as well as pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MPL 100x40x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.98 km/h
(5.27 m/s)
 8.34 J
30 mm 23.84 km/h
(6.62 m/s)
 13.16 J
50 mm 24.60 km/h
(6.83 m/s)
 14.00 J
100 mm 24.83 km/h
(6.90 m/s)
 14.27 J
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly 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 magnet. Wear safety glasses when playing with large magnets.

Table 9: Surface protection spec
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux passing through the magnet pole. Key data when building generators as well as sensors. Pc value 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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains only ~20% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

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

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.

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: 020109-2026
Measurement Calculator

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Model MPL 100x40x20 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 1177.33 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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.
Plate magnets MPL 100x40x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners 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 100x40x20 / N38, we recommend utilizing strong epoxy glues (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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (100x40 mm), which is ideal for flat mounting. 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). The key parameter here is the holding force amounting to approximately 120.01 kg (force ~1177.33 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain attractive force for nearly ten years – the drop is just ~1% (in theory),
  • They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to the option of accurate forming and customization to custom solutions, magnetic components can be manufactured in a wide range of geometric configurations, which amplifies use scope,
  • Significant place in electronics industry – they are commonly used in mass storage devices, electric motors, advanced medical instruments, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of making nuts in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Holding force of 120.01 kg is a measurement result performed under specific, ideal conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • without any insulating layer between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Key elements affecting lifting force

In real-world applications, the actual lifting capacity depends on a number of factors, ranked from crucial:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
  • 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 – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Keep away from children

Only for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.

Allergic reactions

It is widely known that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.

Safe operation

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Bodily injuries

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Demagnetization risk

Keep cool. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Fire warning

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Shattering risk

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Precision electronics

GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Electronic devices

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Implant safety

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

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