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MPL 30x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020142

GTIN/EAN: 5906301811480

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

90 g

Magnetization Direction

↑ axial

Load capacity

24.27 kg / 238.07 N

Magnetic Induction

512.53 mT / 5125 Gs

Coating

[NiCuNi] Nickel

check properties »

43.22 ZŁ with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

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Specifications and form of a magnet can be tested with our modular calculator.

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Technical specification of the product - MPL 30x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020142
GTIN/EAN 5906301811480
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 30 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 90 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.27 kg / 238.07 N
Magnetic Induction ~ ? 512.53 mT / 5125 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x20 / 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 modeling of the magnet - report

These values are the result of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Real-world conditions may deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 30x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5124 Gs
512.4 mT
 24.27 kg / 53.51 LBS
24270.0 g / 238.1 N
 critical level
1 mm 4730 Gs
473.0 mT
 20.68 kg / 45.60 LBS
20685.0 g / 202.9 N
 critical level
2 mm 4335 Gs
433.5 mT
 17.37 kg / 38.30 LBS
17370.7 g / 170.4 N
 critical level
3 mm 3950 Gs
395.0 mT
 14.43 kg / 31.80 LBS
14425.2 g / 141.5 N
 critical level
5 mm 3240 Gs
324.0 mT
 9.71 kg / 21.40 LBS
9706.2 g / 95.2 N
 warning
10 mm 1923 Gs
192.3 mT
 3.42 kg / 7.53 LBS
3417.4 g / 33.5 N
 warning
15 mm 1163 Gs
116.3 mT
 1.25 kg / 2.76 LBS
1250.2 g / 12.3 N
 weak grip
20 mm 736 Gs
73.6 mT
 0.50 kg / 1.10 LBS
500.4 g / 4.9 N
 weak grip
30 mm 338 Gs
33.8 mT
 0.11 kg / 0.23 LBS
105.3 g / 1.0 N
 weak grip
50 mm 106 Gs
10.6 mT
 0.01 kg / 0.02 LBS
10.3 g / 0.1 N
 weak grip
Magnetic force drops sharply per each millimeter of gap. Note that even the smallest gap (e.g., contamination, varnish, dust) significantly weakens the grip. Neodymiums operate strongest during direct contact; gap kills the power. Analyze how rapidly the parameters drop, when the magnet does not adhere tightly to the steel surface. When calculating the mounting, avoid redundant distances.

Table 2: Slippage force (wall)
MPL 30x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.85 kg / 10.70 LBS
4854.0 g / 47.6 N
1 mm Stal (~0.2) 4.14 kg / 9.12 LBS
4136.0 g / 40.6 N
2 mm Stal (~0.2) 3.47 kg / 7.66 LBS
3474.0 g / 34.1 N
3 mm Stal (~0.2) 2.89 kg / 6.36 LBS
2886.0 g / 28.3 N
5 mm Stal (~0.2) 1.94 kg / 4.28 LBS
1942.0 g / 19.1 N
10 mm Stal (~0.2) 0.68 kg / 1.51 LBS
684.0 g / 6.7 N
15 mm Stal (~0.2) 0.25 kg / 0.55 LBS
250.0 g / 2.5 N
20 mm Stal (~0.2) 0.10 kg / 0.22 LBS
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
This section presents the approximate holding capacity needed to start the slippage of the magnet down against a upright steel plate (considering standard friction coefficient). This value depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 30x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.28 kg / 16.05 LBS
7281.0 g / 71.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.85 kg / 10.70 LBS
4854.0 g / 47.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.43 kg / 5.35 LBS
2427.0 g / 23.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.14 kg / 26.75 LBS
12135.0 g / 119.0 N
When mounting a element on a upright wall (e.g., a car body), it will maintain only approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that products slide down faster than they detach. Planning a hanger? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slide down under a noticeably lighter weight. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 30x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.21 kg / 2.68 LBS
1213.5 g / 11.9 N
1 mm
13%
 3.03 kg / 6.69 LBS
3033.8 g / 29.8 N
2 mm
25%
 6.07 kg / 13.38 LBS
6067.5 g / 59.5 N
3 mm
38%
 9.10 kg / 20.06 LBS
9101.3 g / 89.3 N
5 mm
63%
 15.17 kg / 33.44 LBS
15168.8 g / 148.8 N
10 mm
100%
 24.27 kg / 53.51 LBS
24270.0 g / 238.1 N
11 mm
100%
 24.27 kg / 53.51 LBS
24270.0 g / 238.1 N
12 mm
100%
 24.27 kg / 53.51 LBS
24270.0 g / 238.1 N
A thin sheet cannot take in the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a weak sheet, the flux will pass right through and the attraction force will be weaker. To utilize full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the product works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 30x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.27 kg / 53.51 LBS
24270.0 g / 238.1 N
 OK
40 °C -2.2% 23.74 kg / 52.33 LBS
23736.1 g / 232.9 N
 OK
60 °C -4.4% 23.20 kg / 51.15 LBS
23202.1 g / 227.6 N
 OK
80 °C -6.6% 22.67 kg / 49.97 LBS
22668.2 g / 222.4 N
100 °C -28.8% 17.28 kg / 38.10 LBS
17280.2 g / 169.5 N
Classic neodymiums change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently destroy this magnet. With increasing heat, the magnet's force briefly drops. Avoid using this product in hot environments higher than its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 30x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 97.11 kg / 214.09 LBS
5 859 Gs
14.57 kg / 32.11 LBS
14567 g / 142.9 N
 N/A
1 mm 89.88 kg / 198.15 LBS
9 859 Gs
13.48 kg / 29.72 LBS
13482 g / 132.3 N
 80.89 kg / 178.34 LBS
~0 Gs
2 mm 82.77 kg / 182.47 LBS
9 461 Gs
12.42 kg / 27.37 LBS
12415 g / 121.8 N
 74.49 kg / 164.22 LBS
~0 Gs
3 mm 75.96 kg / 167.47 LBS
9 063 Gs
11.39 kg / 25.12 LBS
11394 g / 111.8 N
 68.37 kg / 150.72 LBS
~0 Gs
5 mm 63.42 kg / 139.81 LBS
8 281 Gs
9.51 kg / 20.97 LBS
9513 g / 93.3 N
 57.08 kg / 125.83 LBS
~0 Gs
10 mm 38.84 kg / 85.62 LBS
6 481 Gs
5.83 kg / 12.84 LBS
5826 g / 57.1 N
 34.95 kg / 77.06 LBS
~0 Gs
20 mm 13.67 kg / 30.15 LBS
3 845 Gs
2.05 kg / 4.52 LBS
2051 g / 20.1 N
 12.31 kg / 27.13 LBS
~0 Gs
50 mm 0.88 kg / 1.94 LBS
976 Gs
0.13 kg / 0.29 LBS
132 g / 1.3 N
 0.79 kg / 1.75 LBS
~0 Gs
60 mm 0.42 kg / 0.93 LBS
675 Gs
0.06 kg / 0.14 LBS
63 g / 0.6 N
 0.38 kg / 0.84 LBS
~0 Gs
70 mm 0.22 kg / 0.48 LBS
484 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.43 LBS
~0 Gs
80 mm 0.12 kg / 0.26 LBS
358 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.24 LBS
~0 Gs
90 mm 0.07 kg / 0.15 LBS
272 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
100 mm 0.04 kg / 0.09 LBS
211 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
Two magnetic products interact from a wider radius than a magnet and steel setup. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Estimates demonstrate shear force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 30x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.0 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Mechanical watch 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation poses a real danger to IT equipment and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MPL 30x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.96 km/h
(4.99 m/s)
 1.12 J
30 mm 28.76 km/h
(7.99 m/s)
 2.87 J
50 mm 37.04 km/h
(10.29 m/s)
 4.76 J
100 mm 52.37 km/h
(14.55 m/s)
 9.52 J
Magnetic elements are delicate – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when playing with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x20 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MPL 30x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 30 878 Mx 308.8 µWb
Pc Coefficient 0.74 High (Stable)
Flux value emitted by the pole surface. Key data for generator designers as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 30x20x20 / N38

Environment Effective steel pull Effect
Air (land) 24.27 kg Standard
Water (riverbed) 27.79 kg
(+3.52 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*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) = 0.74

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
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%
Ecology and recycling (GPSR)
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: 020142-2026
Measurement Calculator
Pulling force
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x20x20 mm and a weight of 90 g, guarantees premium class connection. This rectangular block with a force of 238.07 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. Watch your fingers! Magnets with a force of 24.27 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 30x20x20 / 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. 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. 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 30x20x20 mm, which, at a weight of 90 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 24.27 kg (force ~238.07 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of neodymium magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They do not lose magnetism, even during around 10 years – the reduction in power is only ~1% (based on measurements),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • A magnet with a smooth gold surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • 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 accurate machining and adapting to concrete applications,
  • Fundamental importance in innovative solutions – they are commonly used in hard drives, electric drive systems, diagnostic systems, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in small systems

Limitations

Cons of neodymium magnets and proposals for their use:
  • At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these products are able to 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 increases costs of application in large quantities

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Holding force of 24.27 kg is a result of laboratory testing performed under standard conditions:
  • using a sheet made of mild steel, serving as a circuit closing element
  • whose transverse dimension reaches at least 10 mm
  • with an ground contact surface
  • with zero gap (no impurities)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Safe distance

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

Heat sensitivity

Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Magnets are brittle

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

Adults only

Neodymium magnets are not intended for children. Eating a few magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates urgent medical intervention.

Physical harm

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

Metal Allergy

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

GPS and phone interference

Note: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Do not underestimate power

Handle magnets with awareness. Their immense force can shock even experienced users. Plan your moves and do not underestimate their power.

Fire warning

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Medical implants

People with a ICD should maintain an large gap from magnets. The magnetism can stop the operation of the life-saving device.

Important! Learn more about risks in the article: Safety of working with magnets.