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MPL 30x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020143

GTIN/EAN: 5906301811497

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

8.86 kg / 86.90 N

Magnetic Induction

220.03 mT / 2200 Gs

Coating

[NiCuNi] Nickel

technical specifications »

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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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Physical properties - MPL 30x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020143
GTIN/EAN 5906301811497
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 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.86 kg / 86.90 N
Magnetic Induction ~ ? 220.03 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x5 / 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 modeling of the assembly - data

Presented information represent the outcome of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 30x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2200 Gs
220.0 mT
 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
 medium risk
1 mm 2092 Gs
209.2 mT
 8.01 kg / 17.67 pounds
8013.9 g / 78.6 N
 medium risk
2 mm 1961 Gs
196.1 mT
 7.04 kg / 15.53 pounds
7042.1 g / 69.1 N
 medium risk
3 mm 1817 Gs
181.7 mT
 6.04 kg / 13.32 pounds
6041.8 g / 59.3 N
 medium risk
5 mm 1516 Gs
151.6 mT
 4.21 kg / 9.28 pounds
4209.6 g / 41.3 N
 medium risk
10 mm 892 Gs
89.2 mT
 1.46 kg / 3.21 pounds
1456.2 g / 14.3 N
 weak grip
15 mm 519 Gs
51.9 mT
 0.49 kg / 1.09 pounds
492.4 g / 4.8 N
 weak grip
20 mm 313 Gs
31.3 mT
 0.18 kg / 0.40 pounds
179.8 g / 1.8 N
 weak grip
30 mm 132 Gs
13.2 mT
 0.03 kg / 0.07 pounds
31.9 g / 0.3 N
 weak grip
50 mm 37 Gs
3.7 mT
 0.00 kg / 0.01 pounds
2.5 g / 0.0 N
 weak grip
Pulling power weakens significantly with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) significantly diminishes the holding power. Magnetic products operate strongest in perfect adhesion; air break kills the force. Analyze how flashily the load capacity fall, when the magnet does not touch tightly to the metal substrate. When planning the arrangement, eliminate unnecessary gaps.

Table 2: Shear load (vertical surface)
MPL 30x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.77 kg / 3.91 pounds
1772.0 g / 17.4 N
1 mm Stal (~0.2) 1.60 kg / 3.53 pounds
1602.0 g / 15.7 N
2 mm Stal (~0.2) 1.41 kg / 3.10 pounds
1408.0 g / 13.8 N
3 mm Stal (~0.2) 1.21 kg / 2.66 pounds
1208.0 g / 11.9 N
5 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
10 mm Stal (~0.2) 0.29 kg / 0.64 pounds
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.10 kg / 0.22 pounds
98.0 g / 1.0 N
20 mm Stal (~0.2) 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the estimated holding capacity necessary to cause the slippage of the magnet down on a vertical steel plate (assuming typical friction coefficient). This parameter is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.66 kg / 5.86 pounds
2658.0 g / 26.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.77 kg / 3.91 pounds
1772.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.95 pounds
886.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
When mounting a magnet on a upright wall (e.g., a board), it you can count on barely about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip mean that products move down faster than they pop off the substrate. Designing a vertical fastening? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a much lighter load. Utilizing a rubberized coating can effectively improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.88 pounds
2215.0 g / 21.7 N
2 mm
50%
 4.43 kg / 9.77 pounds
4430.0 g / 43.5 N
3 mm
75%
 6.65 kg / 14.65 pounds
6645.0 g / 65.2 N
5 mm
100%
 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
10 mm
100%
 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
11 mm
100%
 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
12 mm
100%
 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
A thin sheet cannot take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you require a sufficiently solid element of steel. The material oversaturation means that on thin elements (e.g., appliance housings), the magnet works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 30x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.86 kg / 19.53 pounds
8860.0 g / 86.9 N
 OK
40 °C -2.2% 8.67 kg / 19.10 pounds
8665.1 g / 85.0 N
 OK
60 °C -4.4% 8.47 kg / 18.67 pounds
8470.2 g / 83.1 N
80 °C -6.6% 8.28 kg / 18.24 pounds
8275.2 g / 81.2 N
100 °C -28.8% 6.31 kg / 13.91 pounds
6308.3 g / 61.9 N
Standard neodymium magnets irreversibly lose power above the temperature limit. Avoid high temperatures – heat can irreversibly damage this magnet. With every degree above norm, the neodymium's capacity briefly drops. Refrain from using this magnet in hot environments higher than its working range. Too high temperature will cause destruction of magnetism.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.90 kg / 39.47 pounds
3 715 Gs
2.69 kg / 5.92 pounds
2685 g / 26.3 N
 N/A
1 mm 17.10 kg / 37.69 pounds
4 300 Gs
2.56 kg / 5.65 pounds
2565 g / 25.2 N
 15.39 kg / 33.92 pounds
~0 Gs
2 mm 16.19 kg / 35.70 pounds
4 184 Gs
2.43 kg / 5.35 pounds
2429 g / 23.8 N
 14.57 kg / 32.13 pounds
~0 Gs
3 mm 15.23 kg / 33.57 pounds
4 058 Gs
2.28 kg / 5.04 pounds
2284 g / 22.4 N
 13.71 kg / 30.22 pounds
~0 Gs
5 mm 13.22 kg / 29.14 pounds
3 780 Gs
1.98 kg / 4.37 pounds
1982 g / 19.4 N
 11.89 kg / 26.22 pounds
~0 Gs
10 mm 8.51 kg / 18.75 pounds
3 033 Gs
1.28 kg / 2.81 pounds
1276 g / 12.5 N
 7.66 kg / 16.88 pounds
~0 Gs
20 mm 2.94 kg / 6.49 pounds
1 784 Gs
0.44 kg / 0.97 pounds
441 g / 4.3 N
 2.65 kg / 5.84 pounds
~0 Gs
50 mm 0.15 kg / 0.32 pounds
398 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
60 mm 0.06 kg / 0.14 pounds
264 Gs
0.01 kg / 0.02 pounds
10 g / 0.1 N
 0.06 kg / 0.13 pounds
~0 Gs
70 mm 0.03 kg / 0.07 pounds
183 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
80 mm 0.02 kg / 0.04 pounds
131 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
97 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
73 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and sheet combination. The connection of two magnets produces a massive flux and a wider radius of performance. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density between like poles drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
Important: Figures show sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MPL 30x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Mobile device 40 Gs (4.0 mT) 5.0 cm
Car key 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 is a large risk to electronics and medical implants. These neodymiums generate a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MPL 30x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.97 km/h
(6.10 m/s)
 0.42 J
30 mm 34.74 km/h
(9.65 m/s)
 1.05 J
50 mm 44.76 km/h
(12.43 m/s)
 1.74 J
100 mm 63.29 km/h
(17.58 m/s)
 3.48 J
NdFeB products are prone to chipping – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Coating parameters (durability)
MPL 30x20x5 / 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 (Pc)
MPL 30x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 30x20x5 / N38

Environment Effective steel pull Effect
Air (land) 8.86 kg Standard
Water (riverbed) 10.14 kg
(+1.28 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Shear force

*Note: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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%
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: 020143-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x20x5 mm and a weight of 22.5 g, guarantees the highest quality connection. This rectangular block with a force of 86.90 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 strong flat 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 8.86 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 30x20x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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. 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: 30 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 8.86 kg (force ~86.90 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the smooth surface of silver, the element becomes visually attractive,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the capacity to adapt to specific needs,
  • Versatile presence in electronics industry – they are used in hard drives, electric motors, precision medical tools, and other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Cons of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing threads in the magnet and complex shapes - recommended is casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The specified lifting capacity represents the limit force, obtained under optimal environment, meaning:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension is min. 10 mm
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency is affected by specific conditions, including (from most important):
  • Gap (betwixt the magnet and the plate), since even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
ICD Warning

Individuals with a pacemaker must maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

GPS Danger

GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Keep away from computers

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Handling guide

Use magnets consciously. Their immense force can shock even experienced users. Plan your moves and respect their power.

Crushing force

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Dust explosion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Adults only

Product intended for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid direct skin contact or opt for versions in plastic housing.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Warning! Need more info? Check our post: Why are neodymium magnets dangerous?