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MPL 30x20x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020286

GTIN/EAN: 5906301811848

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

6.30 kg / 61.84 N

Magnetic Induction

180.57 mT / 1806 Gs

Coating

[NiCuNi] Nickel

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10.23 ZŁ with VAT / pcs + price for transport

8.32 ZŁ net + 23% VAT / pcs

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Technical - MPL 30x20x4 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020286
GTIN/EAN 5906301811848
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 4 mm [±0,1 mm]
Weight 18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.30 kg / 61.84 N
Magnetic Induction ~ ? 180.57 mT / 1806 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x4 / 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 simulation of the magnet - data

These information represent the outcome of a physical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational performance may differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
MPL 30x20x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1805 Gs
180.5 mT
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
 warning
1 mm 1728 Gs
172.8 mT
 5.77 kg / 12.72 lbs
5771.5 g / 56.6 N
 warning
2 mm 1628 Gs
162.8 mT
 5.13 kg / 11.30 lbs
5125.7 g / 50.3 N
 warning
3 mm 1515 Gs
151.5 mT
 4.43 kg / 9.78 lbs
4434.6 g / 43.5 N
 warning
5 mm 1271 Gs
127.1 mT
 3.12 kg / 6.89 lbs
3124.3 g / 30.6 N
 warning
10 mm 751 Gs
75.1 mT
 1.09 kg / 2.40 lbs
1088.7 g / 10.7 N
 safe
15 mm 435 Gs
43.5 mT
 0.37 kg / 0.81 lbs
366.3 g / 3.6 N
 safe
20 mm 262 Gs
26.2 mT
 0.13 kg / 0.29 lbs
132.6 g / 1.3 N
 safe
30 mm 110 Gs
11.0 mT
 0.02 kg / 0.05 lbs
23.2 g / 0.2 N
 safe
50 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 lbs
1.8 g / 0.0 N
 safe
Pulling power drops drastically with every subsequent millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnets hold strongest at the point of direct contact; gap drastically cuts the power. Observe how rapidly the pull force drop, when the product does not adhere tightly to the steel surface. When designing the assembly, avoid unnecessary gaps.

Table 2: Vertical hold (vertical surface)
MPL 30x20x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.26 kg / 2.78 lbs
1260.0 g / 12.4 N
1 mm Stal (~0.2) 1.15 kg / 2.54 lbs
1154.0 g / 11.3 N
2 mm Stal (~0.2) 1.03 kg / 2.26 lbs
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.62 kg / 1.38 lbs
624.0 g / 6.1 N
10 mm Stal (~0.2) 0.22 kg / 0.48 lbs
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.16 lbs
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below shows the theoretical shear load needed to cause the slippage of the magnet down along a upright steel wall (considering typical friction). This value varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x20x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.26 kg / 2.78 lbs
1260.0 g / 12.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.39 lbs
630.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.15 kg / 6.94 lbs
3150.0 g / 30.9 N
When hanging a holder on a upright wall (e.g., a board), it you can count on just approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that holders move down faster than they pop off the substrate. Want to create a hanger? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a significantly smaller load. Using a rubber layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MPL 30x20x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.63 kg / 1.39 lbs
630.0 g / 6.2 N
1 mm
25%
 1.58 kg / 3.47 lbs
1575.0 g / 15.5 N
2 mm
50%
 3.15 kg / 6.94 lbs
3150.0 g / 30.9 N
3 mm
75%
 4.73 kg / 10.42 lbs
4725.0 g / 46.4 N
5 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
10 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
11 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
12 mm
100%
 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
A too thin steel is unable to take in the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet works worse. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MPL 30x20x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.30 kg / 13.89 lbs
6300.0 g / 61.8 N
 OK
40 °C -2.2% 6.16 kg / 13.58 lbs
6161.4 g / 60.4 N
 OK
60 °C -4.4% 6.02 kg / 13.28 lbs
6022.8 g / 59.1 N
80 °C -6.6% 5.88 kg / 12.97 lbs
5884.2 g / 57.7 N
100 °C -28.8% 4.49 kg / 9.89 lbs
4485.6 g / 44.0 N
Standard neodymium magnets change their properties power above the temperature limit. Protect against heat – high temperature can irreversibly damage this product. With increasing heat, the magnet's power momentarily decreases. Do not use this product close to ovens exceeding its operating temperature limit. Too high temperature will result in destruction of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 30x20x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.06 kg / 26.58 lbs
3 198 Gs
1.81 kg / 3.99 lbs
1809 g / 17.7 N
 N/A
1 mm 11.59 kg / 25.55 lbs
3 540 Gs
1.74 kg / 3.83 lbs
1739 g / 17.1 N
 10.43 kg / 23.00 lbs
~0 Gs
2 mm 11.05 kg / 24.35 lbs
3 456 Gs
1.66 kg / 3.65 lbs
1657 g / 16.3 N
 9.94 kg / 21.92 lbs
~0 Gs
3 mm 10.45 kg / 23.03 lbs
3 361 Gs
1.57 kg / 3.45 lbs
1567 g / 15.4 N
 9.40 kg / 20.73 lbs
~0 Gs
5 mm 9.15 kg / 20.18 lbs
3 146 Gs
1.37 kg / 3.03 lbs
1373 g / 13.5 N
 8.24 kg / 18.16 lbs
~0 Gs
10 mm 5.98 kg / 13.18 lbs
2 543 Gs
0.90 kg / 1.98 lbs
897 g / 8.8 N
 5.38 kg / 11.86 lbs
~0 Gs
20 mm 2.08 kg / 4.59 lbs
1 501 Gs
0.31 kg / 0.69 lbs
313 g / 3.1 N
 1.88 kg / 4.13 lbs
~0 Gs
50 mm 0.10 kg / 0.22 lbs
331 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
60 mm 0.04 kg / 0.10 lbs
219 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
 0.04 kg / 0.09 lbs
~0 Gs
70 mm 0.02 kg / 0.05 lbs
151 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
108 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
90 mm 0.01 kg / 0.01 lbs
80 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
60 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a neodymium and metal combination. The setup of two magnets produces a massive flux and a further horizon of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Note: Calculations refer to shear force of dual same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MPL 30x20x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a real danger to electronics and pacemakers. These neodymiums produce a flux that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and housings. Special caution must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MPL 30x20x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.81 km/h
(5.78 m/s)
 0.30 J
30 mm 32.75 km/h
(9.10 m/s)
 0.75 J
50 mm 42.20 km/h
(11.72 m/s)
 1.24 J
100 mm 59.66 km/h
(16.57 m/s)
 2.47 J
Neodymium magnets are delicate – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x20x4 / 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 30x20x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.8 µWb
Pc Coefficient 0.22 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MPL 30x20x4 / N38

Environment Effective steel pull Effect
Air (land) 6.30 kg Standard
Water (riverbed) 7.21 kg
(+0.91 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!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.22

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
Material specification
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: 020286-2026
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x20x4 mm and a weight of 18 g, guarantees the highest quality connection. As a block magnet with high power (approx. 6.30 kg), this product is available immediately from our warehouse in Poland. Furthermore, 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. To separate the MPL 30x20x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x20x4 / 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.
For mounting flat magnets MPL 30x20x4 / N38, it is best to use 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 30x20x4 mm, which, at a weight of 18 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 6.30 kg (force ~61.84 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • A magnet with a metallic nickel surface looks better,
  • Magnetic induction on the top side of the magnet is exceptional,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in forming and the ability to customize to complex applications,
  • Huge importance in modern industrial fields – they serve a role in hard drives, electromotive mechanisms, medical equipment, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and ways of using them
  • At very 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.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity represents the limit force, measured under laboratory conditions, specifically:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • with zero gap (without paint)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the application force may be lower depending on elements below, starting with the most relevant:
  • Distance (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the holding force.

H&S for magnets
Cards and drives

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Nickel coating and allergies

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, cease working with magnets and use protective gear.

Serious injuries

Watch your fingers. Two large magnets will join immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Heat warning

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Machining danger

Machining of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Material brittleness

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.

Powerful field

Handle with care. Rare earth magnets act from a long distance and connect with massive power, often faster than you can react.

Threat to navigation

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Implant safety

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

Choking Hazard

Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?