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MPL 30x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020141

GTIN/EAN: 5906301811473

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

19.53 kg / 191.55 N

Magnetic Induction

371.57 mT / 3716 Gs

Coating

[NiCuNi] Nickel

view specifications »

16.11 ZŁ with VAT / pcs + price for transport

13.10 ZŁ net + 23% VAT / pcs

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Product card - MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020141
GTIN/EAN 5906301811473
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 10 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.53 kg / 191.55 N
Magnetic Induction ~ ? 371.57 mT / 3716 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / 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 - report

Presented data constitute the result of a physical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - characteristics
MPL 30x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3715 Gs
371.5 mT
 19.53 kg / 43.06 LBS
19530.0 g / 191.6 N
 critical level
1 mm 3464 Gs
346.4 mT
 16.98 kg / 37.44 LBS
16983.1 g / 166.6 N
 critical level
2 mm 3197 Gs
319.7 mT
 14.47 kg / 31.89 LBS
14466.6 g / 141.9 N
 critical level
3 mm 2927 Gs
292.7 mT
 12.12 kg / 26.73 LBS
12123.3 g / 118.9 N
 critical level
5 mm 2408 Gs
240.8 mT
 8.21 kg / 18.10 LBS
8207.8 g / 80.5 N
 warning
10 mm 1411 Gs
141.1 mT
 2.82 kg / 6.21 LBS
2815.6 g / 27.6 N
 warning
15 mm 832 Gs
83.2 mT
 0.98 kg / 2.16 LBS
979.7 g / 9.6 N
 safe
20 mm 512 Gs
51.2 mT
 0.37 kg / 0.82 LBS
371.2 g / 3.6 N
 safe
30 mm 224 Gs
22.4 mT
 0.07 kg / 0.16 LBS
70.7 g / 0.7 N
 safe
50 mm 65 Gs
6.5 mT
 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
 safe
Grip strength decreases sharply with every subsequent millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, paint, dust) noticeably weakens the grip. Neodymiums work optimally at the point of direct contact; distance drastically cuts the force. Observe how flashily the load capacity drop, when the product does not touch directly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Sliding hold (vertical surface)
MPL 30x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.91 kg / 8.61 LBS
3906.0 g / 38.3 N
1 mm Stal (~0.2) 3.40 kg / 7.49 LBS
3396.0 g / 33.3 N
2 mm Stal (~0.2) 2.89 kg / 6.38 LBS
2894.0 g / 28.4 N
3 mm Stal (~0.2) 2.42 kg / 5.34 LBS
2424.0 g / 23.8 N
5 mm Stal (~0.2) 1.64 kg / 3.62 LBS
1642.0 g / 16.1 N
10 mm Stal (~0.2) 0.56 kg / 1.24 LBS
564.0 g / 5.5 N
15 mm Stal (~0.2) 0.20 kg / 0.43 LBS
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.07 kg / 0.16 LBS
74.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
This section calculates the approximate holding capacity needed to cause the shifting of the magnet vertically on a upright steel wall (assuming standard friction coefficient). This value is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 30x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.86 kg / 12.92 LBS
5859.0 g / 57.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.91 kg / 8.61 LBS
3906.0 g / 38.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.95 kg / 4.31 LBS
1953.0 g / 19.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.77 kg / 21.53 LBS
9765.0 g / 95.8 N
When hanging a magnet on a vertical plane (e.g., a car body), it you can count on barely about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that products move down faster than they detach. Designing a vertical fastening? Note that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller load. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 30x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.98 kg / 2.15 LBS
976.5 g / 9.6 N
1 mm
13%
 2.44 kg / 5.38 LBS
2441.3 g / 23.9 N
2 mm
25%
 4.88 kg / 10.76 LBS
4882.5 g / 47.9 N
3 mm
38%
 7.32 kg / 16.15 LBS
7323.8 g / 71.8 N
5 mm
63%
 12.21 kg / 26.91 LBS
12206.3 g / 119.7 N
10 mm
100%
 19.53 kg / 43.06 LBS
19530.0 g / 191.6 N
11 mm
100%
 19.53 kg / 43.06 LBS
19530.0 g / 191.6 N
12 mm
100%
 19.53 kg / 43.06 LBS
19530.0 g / 191.6 N
A thin metal plate cannot take in the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To achieve the maximum of this magnet's potential, you require a sufficiently solid element of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 30x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.53 kg / 43.06 LBS
19530.0 g / 191.6 N
 OK
40 °C -2.2% 19.10 kg / 42.11 LBS
19100.3 g / 187.4 N
 OK
60 °C -4.4% 18.67 kg / 41.16 LBS
18670.7 g / 183.2 N
80 °C -6.6% 18.24 kg / 40.21 LBS
18241.0 g / 178.9 N
100 °C -28.8% 13.91 kg / 30.66 LBS
13905.4 g / 136.4 N
Classic neodymiums lose strength past the thermal threshold. Protect against heat – excessive heat can permanently demagnetize this magnet. With every degree above norm, the magnet's power temporarily lowers. Avoid using this product close to ovens higher than its safe range. Too high temperature will cause destruction of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.05 kg / 112.54 LBS
5 124 Gs
7.66 kg / 16.88 LBS
7657 g / 75.1 N
 N/A
1 mm 47.76 kg / 105.28 LBS
7 186 Gs
7.16 kg / 15.79 LBS
7163 g / 70.3 N
 42.98 kg / 94.76 LBS
~0 Gs
2 mm 44.39 kg / 97.86 LBS
6 928 Gs
6.66 kg / 14.68 LBS
6658 g / 65.3 N
 39.95 kg / 88.08 LBS
~0 Gs
3 mm 41.06 kg / 90.52 LBS
6 663 Gs
6.16 kg / 13.58 LBS
6159 g / 60.4 N
 36.95 kg / 81.47 LBS
~0 Gs
5 mm 34.68 kg / 76.45 LBS
6 124 Gs
5.20 kg / 11.47 LBS
5202 g / 51.0 N
 31.21 kg / 68.81 LBS
~0 Gs
10 mm 21.45 kg / 47.30 LBS
4 817 Gs
3.22 kg / 7.09 LBS
3218 g / 31.6 N
 19.31 kg / 42.57 LBS
~0 Gs
20 mm 7.36 kg / 16.22 LBS
2 821 Gs
1.10 kg / 2.43 LBS
1104 g / 10.8 N
 6.62 kg / 14.60 LBS
~0 Gs
50 mm 0.40 kg / 0.89 LBS
662 Gs
0.06 kg / 0.13 LBS
61 g / 0.6 N
 0.36 kg / 0.80 LBS
~0 Gs
60 mm 0.18 kg / 0.41 LBS
447 Gs
0.03 kg / 0.06 LBS
28 g / 0.3 N
 0.17 kg / 0.37 LBS
~0 Gs
70 mm 0.09 kg / 0.20 LBS
314 Gs
0.01 kg / 0.03 LBS
14 g / 0.1 N
 0.08 kg / 0.18 LBS
~0 Gs
80 mm 0.05 kg / 0.11 LBS
228 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
 0.04 kg / 0.10 LBS
~0 Gs
90 mm 0.03 kg / 0.06 LBS
170 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
100 mm 0.02 kg / 0.03 LBS
130 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The connection of magnet-to-magnet generates a stronger field and a larger range of operation. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
Important: Figures demonstrate friction force of dual same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MPL 30x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a real danger to IT equipment and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MPL 30x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.82 km/h
(6.34 m/s)
 0.90 J
30 mm 36.47 km/h
(10.13 m/s)
 2.31 J
50 mm 46.99 km/h
(13.05 m/s)
 3.83 J
100 mm 66.44 km/h
(18.46 m/s)
 7.66 J
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x10 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 30x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 801 Mx 228.0 µWb
Pc Coefficient 0.46 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 30x20x10 / N38

Environment Effective steel pull Effect
Air (land) 19.53 kg Standard
Water (riverbed) 22.36 kg
(+2.83 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.46

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 specification and ecology
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: 020141-2026
Measurement Calculator
Pulling force
Magnetic Field
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Component MPL 30x20x10 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 19.53 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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 30x20x10 / 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 30x20x10 / N38 are the foundation for many industrial devices, such as magnetic separators 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. 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 30x20x10 / N38 model is magnetized axially (dimension 10 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 (30x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 20 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 30x20x10 mm and a self-weight of 45 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which allows for strong attraction,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Possibility of individual machining and adapting to individual applications,
  • Versatile presence in electronics industry – they are used in mass storage devices, electric drive systems, medical equipment, as well as other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Cons of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

Breakaway force is the result of a measurement for the most favorable conditions, taking into account:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth touching surface
  • with zero gap (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

What influences lifting capacity in practice

Real force is influenced by specific conditions, including (from priority):
  • Distance – the presence of any layer (paint, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
  • Material type – the best choice is high-permeability steel. Cast iron may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Heat warning

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

No play value

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

Electronic hazard

Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.

Life threat

People with a pacemaker must keep an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Dust explosion hazard

Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Fragile material

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Allergic reactions

Some people experience a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause an allergic reaction. We strongly advise use protective gloves.

Phone sensors

GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Respect the power

Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.

Finger safety

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?