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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

335.30 with VAT / pcs + price for transport

272.60 ZŁ net + 23% VAT / pcs

bulk discounts:

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Physical properties - 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 analysis of the magnet - technical parameters

Presented data constitute the direct effect of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (force 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 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
safe

Table 2: Sliding 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

Table 3: Wall mounting (shearing) - 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

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 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

Table 5: Working in heat (material behavior) - 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

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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

Table 7: Safety (HSE) (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
Phone / Smartphone 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

Table 8: Impact energy (cracking risk) - collision effects
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

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)

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

Parameter Value SI Unit / Description
Magnetic Flux 131 922 Mx 1319.2 µWb
Pc Coefficient 0.38 Low (Flat)

Table 11: Underwater work (magnet fishing)
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!
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*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) = 0.38

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 specification and ecology
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%
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
Quick Unit Converter
Pulling force

Field Strength

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 100x40x20 mm and a weight of 600 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 120.01 kg), this product is available immediately from our warehouse in Poland. Furthermore, 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 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. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 100x40x20 / N38 model is magnetized axially (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (100x40 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
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.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By using a reflective coating of silver, the element has an nice look,
  • Magnets are characterized by excellent magnetic induction on the outer side,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise shaping and optimizing to defined requirements,
  • Key role in modern technologies – they are commonly used in hard drives, drive modules, diagnostic systems, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Additionally, small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Holding force of 120.01 kg is a measurement result conducted under specific, ideal conditions:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness no less than 10 mm
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in temp. approx. 20°C

What influences lifting capacity in practice

Please note that the application force will differ influenced by the following factors, in order of importance:
  • Distance (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – 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.
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be wasted to the other side.
  • Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

H&S for magnets
Immense force

Handle with care. Neodymium magnets act from a distance and snap with massive power, often quicker than you can react.

Magnets are brittle

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Combustion hazard

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

Magnetic media

Very strong magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Bone fractures

Big blocks can crush fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

GPS Danger

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.

Implant safety

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Swallowing risk

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.

Avoid contact if allergic

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands and choose coated magnets.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.

Safety First! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98