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MPL 30x15x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020389

GTIN/EAN: 5906301811886

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

33.75 g

Magnetization Direction

↑ axial

Load capacity

16.84 kg / 165.22 N

Magnetic Induction

413.45 mT / 4135 Gs

Coating

[NiCuNi] Nickel

product specifications »

24.48 ZŁ with VAT / pcs + price for transport

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Product card - MPL 30x15x10 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020389
GTIN/EAN 5906301811886
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 15 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 33.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 16.84 kg / 165.22 N
Magnetic Induction ~ ? 413.45 mT / 4135 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x10 / 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 analysis of the product - report

These data represent the outcome of a physical analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these data as a supplementary guide for designers.

Table 1: Static force (force vs distance) - power drop
MPL 30x15x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4133 Gs
413.3 mT
 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
 dangerous!
1 mm 3754 Gs
375.4 mT
 13.89 kg / 30.62 pounds
13889.5 g / 136.3 N
 dangerous!
2 mm 3365 Gs
336.5 mT
 11.16 kg / 24.60 pounds
11159.2 g / 109.5 N
 dangerous!
3 mm 2988 Gs
298.8 mT
 8.80 kg / 19.41 pounds
8803.6 g / 86.4 N
 warning
5 mm 2321 Gs
232.1 mT
 5.31 kg / 11.71 pounds
5309.9 g / 52.1 N
 warning
10 mm 1225 Gs
122.5 mT
 1.48 kg / 3.26 pounds
1480.1 g / 14.5 N
 low risk
15 mm 684 Gs
68.4 mT
 0.46 kg / 1.02 pounds
461.6 g / 4.5 N
 low risk
20 mm 409 Gs
40.9 mT
 0.16 kg / 0.36 pounds
164.8 g / 1.6 N
 low risk
30 mm 173 Gs
17.3 mT
 0.03 kg / 0.07 pounds
29.6 g / 0.3 N
 low risk
50 mm 50 Gs
5.0 mT
 0.00 kg / 0.01 pounds
2.4 g / 0.0 N
 low risk
Magnetic force drops drastically with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., contamination, paint, rust) noticeably diminishes the holding power. Neodymiums work optimally at the point of direct contact; gap weakens the force. Observe how quickly the load capacity fall, when the magnet does not adhere flatly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Slippage capacity (vertical surface)
MPL 30x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.37 kg / 7.43 pounds
3368.0 g / 33.0 N
1 mm Stal (~0.2) 2.78 kg / 6.12 pounds
2778.0 g / 27.3 N
2 mm Stal (~0.2) 2.23 kg / 4.92 pounds
2232.0 g / 21.9 N
3 mm Stal (~0.2) 1.76 kg / 3.88 pounds
1760.0 g / 17.3 N
5 mm Stal (~0.2) 1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
10 mm Stal (~0.2) 0.30 kg / 0.65 pounds
296.0 g / 2.9 N
15 mm Stal (~0.2) 0.09 kg / 0.20 pounds
92.0 g / 0.9 N
20 mm Stal (~0.2) 0.03 kg / 0.07 pounds
32.0 g / 0.3 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
The table below presents the approximate shear load needed to initiate the sliding of the magnet downwards along a vertical metal surface (assuming standard friction coefficient). The holding force depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x15x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.05 kg / 11.14 pounds
5052.0 g / 49.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.37 kg / 7.43 pounds
3368.0 g / 33.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.68 kg / 3.71 pounds
1684.0 g / 16.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.42 kg / 18.56 pounds
8420.0 g / 82.6 N
When hanging a element on a vertical plane (e.g., a fridge), it will maintain just approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient influence the fact that magnets slip easier than they detach. Designing a vertical fastening? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a significantly smaller weight. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MPL 30x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
1 mm
13%
 2.11 kg / 4.64 pounds
2105.0 g / 20.7 N
2 mm
25%
 4.21 kg / 9.28 pounds
4210.0 g / 41.3 N
3 mm
38%
 6.31 kg / 13.92 pounds
6315.0 g / 62.0 N
5 mm
63%
 10.53 kg / 23.20 pounds
10525.0 g / 103.3 N
10 mm
100%
 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
11 mm
100%
 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
12 mm
100%
 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
A thin sheet 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 pass right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you require a sufficiently solid piece of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MPL 30x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.84 kg / 37.13 pounds
16840.0 g / 165.2 N
 OK
40 °C -2.2% 16.47 kg / 36.31 pounds
16469.5 g / 161.6 N
 OK
60 °C -4.4% 16.10 kg / 35.49 pounds
16099.0 g / 157.9 N
80 °C -6.6% 15.73 kg / 34.68 pounds
15728.6 g / 154.3 N
100 °C -28.8% 11.99 kg / 26.43 pounds
11990.1 g / 117.6 N
Standard neodymium magnets irreversibly lose power past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With increasing heat, the magnet's capacity temporarily drops. Avoid using this product close to heaters higher than its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 30x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 47.39 kg / 104.48 pounds
5 357 Gs
7.11 kg / 15.67 pounds
7109 g / 69.7 N
 N/A
1 mm 43.23 kg / 95.30 pounds
7 895 Gs
6.48 kg / 14.29 pounds
6484 g / 63.6 N
 38.90 kg / 85.77 pounds
~0 Gs
2 mm 39.09 kg / 86.17 pounds
7 507 Gs
5.86 kg / 12.93 pounds
5863 g / 57.5 N
 35.18 kg / 77.56 pounds
~0 Gs
3 mm 35.13 kg / 77.45 pounds
7 117 Gs
5.27 kg / 11.62 pounds
5270 g / 51.7 N
 31.62 kg / 69.70 pounds
~0 Gs
5 mm 27.95 kg / 61.61 pounds
6 348 Gs
4.19 kg / 9.24 pounds
4192 g / 41.1 N
 25.15 kg / 55.45 pounds
~0 Gs
10 mm 14.94 kg / 32.94 pounds
4 642 Gs
2.24 kg / 4.94 pounds
2242 g / 22.0 N
 13.45 kg / 29.65 pounds
~0 Gs
20 mm 4.17 kg / 9.18 pounds
2 451 Gs
0.62 kg / 1.38 pounds
625 g / 6.1 N
 3.75 kg / 8.26 pounds
~0 Gs
50 mm 0.19 kg / 0.41 pounds
519 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
 0.17 kg / 0.37 pounds
~0 Gs
60 mm 0.08 kg / 0.18 pounds
347 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
70 mm 0.04 kg / 0.09 pounds
242 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
175 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
130 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
99 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the collision energy is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Figures demonstrate sliding force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x15x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.0 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Mechanical watch 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Powerful magnet radiation poses a real danger to electronics as well as medical implants. These NdFeB products produce a field that prevents correct functioning of digital equipment. Notice: the unseen radiation acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 30x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.73 km/h
(6.59 m/s)
 0.73 J
30 mm 39.06 km/h
(10.85 m/s)
 1.99 J
50 mm 50.38 km/h
(13.99 m/s)
 3.30 J
100 mm 71.24 km/h
(19.79 m/s)
 6.61 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during installation 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. Use safety goggles when playing with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x15x10 / 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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 30x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 390 Mx 183.9 µWb
Pc Coefficient 0.52 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter for generator designers as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 30x15x10 / N38

Environment Effective steel pull Effect
Air (land) 16.84 kg Standard
Water (riverbed) 19.28 kg
(+2.44 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely limits the holding force.

3. Power loss vs temp

*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) = 0.52

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 specification and ecology
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%
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: 020389-2026
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Field Strength
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x15x10 mm and a weight of 33.75 g, guarantees the highest quality connection. This magnetic block with a force of 165.22 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 16.84 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x15x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 16.84 kg), they are ideal as closers in furniture making and mounting elements in automation. 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).
Standardly, the MPL 30x15x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. 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 30x15x10 mm, which, at a weight of 33.75 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x15x10 mm and a self-weight of 33.75 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • By using a decorative layer of silver, the element presents an professional look,
  • Magnets are characterized by huge magnetic induction on the surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the ability of precise forming and customization to unique requirements, neodymium magnets can be created in a wide range of geometric configurations, which amplifies use scope,
  • Wide application in modern industrial fields – they find application in computer drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of NdFeB magnets:
  • 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.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

The load parameter shown concerns the maximum value, measured under optimal environment, namely:
  • using a sheet made of mild steel, functioning as a circuit closing element
  • with a cross-section of at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at temperature room level

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity is determined by several key aspects, presented from crucial:
  • Distance (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Safety rules for work with neodymium magnets
Power loss in heat

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Electronic hazard

Do not bring magnets close to a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Fragile material

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Product not for children

Product intended for adults. Small elements can be swallowed, causing severe trauma. Keep out of reach of kids and pets.

Handling guide

Exercise caution. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

Allergy Warning

Studies show that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.

Bone fractures

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Magnetic interference

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Fire warning

Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Implant safety

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

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