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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

see parameters »

335.30 ZŁ with VAT / pcs + price for transport

272.60 ZŁ net + 23% VAT / pcs

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Technical details - 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 magnet - technical parameters

These data constitute the result of a engineering simulation. Results are based on models for the material Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - 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 LBS
120010.0 g / 1177.3 N
 critical level
1 mm 3268 Gs
326.8 mT
 112.70 kg / 248.45 LBS
112695.4 g / 1105.5 N
 critical level
2 mm 3158 Gs
315.8 mT
 105.27 kg / 232.09 LBS
105272.6 g / 1032.7 N
 critical level
3 mm 3046 Gs
304.6 mT
 97.92 kg / 215.88 LBS
97921.3 g / 960.6 N
 critical level
5 mm 2818 Gs
281.8 mT
 83.78 kg / 184.71 LBS
83783.3 g / 821.9 N
 critical level
10 mm 2266 Gs
226.6 mT
 54.17 kg / 119.43 LBS
54174.5 g / 531.5 N
 critical level
15 mm 1794 Gs
179.4 mT
 33.96 kg / 74.86 LBS
33955.7 g / 333.1 N
 critical level
20 mm 1419 Gs
141.9 mT
 21.25 kg / 46.84 LBS
21248.1 g / 208.4 N
 critical level
30 mm 908 Gs
90.8 mT
 8.70 kg / 19.17 LBS
8696.3 g / 85.3 N
 medium risk
50 mm 416 Gs
41.6 mT
 1.83 kg / 4.02 LBS
1825.4 g / 17.9 N
 weak grip
Pulling power weakens significantly with every subsequent millimeter of spacing. Note that even a very thin break (e.g., contamination, varnish, dust) strongly weakens the grip. Magnets work strongest at the point of direct contact; gap weakens the force. Notice how rapidly the parameters drop, when the magnet does not touch flatly to the steel surface. When planning the mounting, avoid additional spacers.

Table 2: Sliding hold (wall)
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 table below calculates the theoretical weight limit sufficient to start the shifting of the magnet downwards against a upright steel plate (assuming standard friction coefficient). This parameter is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 placing a holder on a vertical surface (e.g., a board), it will only hold only about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient influence the fact that products slip easier than they pull off. Designing a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slip down under a noticeably lighter load. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - 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 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 too thin steel cannot absorb the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel thickness 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 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
Standard neodymium magnets lose strength past the thermal threshold. Avoid high temperatures – heat can irreversibly destroy this magnet. With increasing heat, the magnet's force briefly drops. Refrain from using this product close to ovens exceeding its working range. Exceeding the critical threshold will cause destruction of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
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 strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a wider radius of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still large.
*Field value in repulsion mode drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Results show sliding force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 18.5 cm
Mobile device 40 Gs (4.0 mT) 14.5 cm
Car key 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 large risk to electronic devices as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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 delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
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)
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 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 for generator designers as well as sensors. Pc value defines the working geometry.

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely 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
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%
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: 020109-2026
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Magnet pull force
Magnetic Induction
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Model MPL 100x40x20 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular 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 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 120.01 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 100x40x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 120.01 kg), they are ideal as closers 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 two-component adhesives (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. 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.
This model is characterized by dimensions 100x40x20 mm, which, at a weight of 600 g, makes it an element with high energy density. 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under external field action,
  • By applying a smooth layer of gold, the element gains an modern look,
  • Magnets are distinguished by huge magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of exact modeling as well as modifying to complex conditions,
  • Key role in advanced technology sectors – they are commonly used in magnetic memories, drive modules, medical devices, also complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose their power 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 rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 120.01 kg is a result of laboratory testing conducted under standard conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • whose thickness equals approx. 10 mm
  • with an ground touching surface
  • without any clearance between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by specific conditions, mainly (from priority):
  • Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying 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. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Respect the power

Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and do not underestimate their power.

Heat warning

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

Warning for heart patients

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Material brittleness

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets will cause them shattering into small pieces.

Compass and GPS

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Physical harm

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Dust is flammable

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Electronic devices

Do not bring magnets near a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Nickel coating and allergies

Certain individuals have a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact can result in skin redness. It is best to wear safety gloves.

Choking Hazard

These products are not intended for children. Swallowing several magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Danger! Details about hazards in the article: Safety of working with magnets.