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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

see properties »

43.22 ZŁ with VAT / pcs + price for transport

35.14 ZŁ net + 23% VAT / pcs

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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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Specifications as well as appearance of a neodymium magnet can be tested with our magnetic calculator.

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Product card - 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

Physical analysis of the product - data

The following values constitute the result of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual parameters may differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static 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 pounds
24270.0 g / 238.1 N
 dangerous!
1 mm 4730 Gs
473.0 mT
 20.68 kg / 45.60 pounds
20685.0 g / 202.9 N
 dangerous!
2 mm 4335 Gs
433.5 mT
 17.37 kg / 38.30 pounds
17370.7 g / 170.4 N
 dangerous!
3 mm 3950 Gs
395.0 mT
 14.43 kg / 31.80 pounds
14425.2 g / 141.5 N
 dangerous!
5 mm 3240 Gs
324.0 mT
 9.71 kg / 21.40 pounds
9706.2 g / 95.2 N
 strong
10 mm 1923 Gs
192.3 mT
 3.42 kg / 7.53 pounds
3417.4 g / 33.5 N
 strong
15 mm 1163 Gs
116.3 mT
 1.25 kg / 2.76 pounds
1250.2 g / 12.3 N
 weak grip
20 mm 736 Gs
73.6 mT
 0.50 kg / 1.10 pounds
500.4 g / 4.9 N
 weak grip
30 mm 338 Gs
33.8 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 weak grip
50 mm 106 Gs
10.6 mT
 0.01 kg / 0.02 pounds
10.3 g / 0.1 N
 weak grip
Magnetic force decreases drastically per each millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, varnish, rust) significantly weakens the grip. Magnetic products work optimally during direct contact; distance drastically cuts the force. Notice how flashily the parameters fall, when the product does not touch directly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Shear 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 pounds
4854.0 g / 47.6 N
1 mm Stal (~0.2) 4.14 kg / 9.12 pounds
4136.0 g / 40.6 N
2 mm Stal (~0.2) 3.47 kg / 7.66 pounds
3474.0 g / 34.1 N
3 mm Stal (~0.2) 2.89 kg / 6.36 pounds
2886.0 g / 28.3 N
5 mm Stal (~0.2) 1.94 kg / 4.28 pounds
1942.0 g / 19.1 N
10 mm Stal (~0.2) 0.68 kg / 1.51 pounds
684.0 g / 6.7 N
15 mm Stal (~0.2) 0.25 kg / 0.55 pounds
250.0 g / 2.5 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below shows the estimated weight limit necessary to initiate the sliding of the magnet vertically against a vertical steel plate (considering standard friction). This parameter is relative to the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 pounds
7281.0 g / 71.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.85 kg / 10.70 pounds
4854.0 g / 47.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.43 kg / 5.35 pounds
2427.0 g / 23.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.14 kg / 26.75 pounds
12135.0 g / 119.0 N
When placing a magnet on a upright wall (e.g., a fridge), it will only hold just approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient mean that holders move down easier than they detach. Want to create a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter cargo. Application of an anti-slip pad can effectively raise the stability.

Table 4: Steel thickness (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 pounds
1213.5 g / 11.9 N
1 mm
13%
 3.03 kg / 6.69 pounds
3033.8 g / 29.8 N
2 mm
25%
 6.07 kg / 13.38 pounds
6067.5 g / 59.5 N
3 mm
38%
 9.10 kg / 20.06 pounds
9101.3 g / 89.3 N
5 mm
63%
 15.17 kg / 33.44 pounds
15168.8 g / 148.8 N
10 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
11 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
12 mm
100%
 24.27 kg / 53.51 pounds
24270.0 g / 238.1 N
A too thin steel is unable to conduct the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a thin surface, the field will pass right through and the holding will be smaller. To utilize 100% of this magnet's potential, you require a sufficiently solid backing of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - 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 pounds
24270.0 g / 238.1 N
 OK
40 °C -2.2% 23.74 kg / 52.33 pounds
23736.1 g / 232.9 N
 OK
60 °C -4.4% 23.20 kg / 51.15 pounds
23202.1 g / 227.6 N
 OK
80 °C -6.6% 22.67 kg / 49.97 pounds
22668.2 g / 222.4 N
100 °C -28.8% 17.28 kg / 38.10 pounds
17280.2 g / 169.5 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Watch out for overheating – heat can irreversibly destroy this product. As the temperature rises, the neodymium's force temporarily drops. Do not use this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 97.11 kg / 214.09 pounds
5 859 Gs
14.57 kg / 32.11 pounds
14567 g / 142.9 N
 N/A
1 mm 89.88 kg / 198.15 pounds
9 859 Gs
13.48 kg / 29.72 pounds
13482 g / 132.3 N
 80.89 kg / 178.34 pounds
~0 Gs
2 mm 82.77 kg / 182.47 pounds
9 461 Gs
12.42 kg / 27.37 pounds
12415 g / 121.8 N
 74.49 kg / 164.22 pounds
~0 Gs
3 mm 75.96 kg / 167.47 pounds
9 063 Gs
11.39 kg / 25.12 pounds
11394 g / 111.8 N
 68.37 kg / 150.72 pounds
~0 Gs
5 mm 63.42 kg / 139.81 pounds
8 281 Gs
9.51 kg / 20.97 pounds
9513 g / 93.3 N
 57.08 kg / 125.83 pounds
~0 Gs
10 mm 38.84 kg / 85.62 pounds
6 481 Gs
5.83 kg / 12.84 pounds
5826 g / 57.1 N
 34.95 kg / 77.06 pounds
~0 Gs
20 mm 13.67 kg / 30.15 pounds
3 845 Gs
2.05 kg / 4.52 pounds
2051 g / 20.1 N
 12.31 kg / 27.13 pounds
~0 Gs
50 mm 0.88 kg / 1.94 pounds
976 Gs
0.13 kg / 0.29 pounds
132 g / 1.3 N
 0.79 kg / 1.75 pounds
~0 Gs
60 mm 0.42 kg / 0.93 pounds
675 Gs
0.06 kg / 0.14 pounds
63 g / 0.6 N
 0.38 kg / 0.84 pounds
~0 Gs
70 mm 0.22 kg / 0.48 pounds
484 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.43 pounds
~0 Gs
80 mm 0.12 kg / 0.26 pounds
358 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
90 mm 0.07 kg / 0.15 pounds
272 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.14 pounds
~0 Gs
100 mm 0.04 kg / 0.09 pounds
211 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a larger range of operation. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is a bit weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Calculations show shear force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
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
Timepiece 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 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
A strong magnetic field poses a real danger to electronic devices and medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and glass. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, 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
Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical 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 passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
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: 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. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Caution: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Plate thickness effect

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

3. Temperature resistance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.74

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%
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: 020142-2026
Measurement Calculator
Force (pull)
Magnetic Induction
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Component MPL 30x20x20 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 238.07 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 24.27 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.
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. 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 (30x20 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 30x20x20 mm, which, at a weight of 90 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x20x20 mm and a self-weight of 90 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over nearly ten years – the decrease in strength is only ~1% (theoretically),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • A magnet with a shiny gold surface has an effective appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Considering the possibility of accurate forming and adaptation to custom needs, magnetic components can be modeled in a wide range of shapes and sizes, which amplifies use scope,
  • Universal use in future technologies – they find application in HDD drives, brushless drives, diagnostic systems, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium 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 lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The specified lifting capacity refers to the maximum value, measured under ideal test conditions, specifically:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • with an ideally smooth touching surface
  • with zero gap (no impurities)
  • during pulling in a direction perpendicular to the mounting surface
  • at standard ambient temperature

Determinants of lifting force in real conditions

In real-world applications, the real power is determined by many variables, ranked from crucial:
  • Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Alloy steels lower magnetic permeability and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings
Do not underestimate power

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Flammability

Machining of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Nickel allergy

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from direct skin contact and select versions in plastic housing.

Power loss in heat

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Fragile material

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Adults only

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

Medical interference

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Bodily injuries

Big blocks can crush fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Magnetic media

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

GPS and phone interference

GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Safety First! Learn more about hazards in the article: Safety of working with magnets.