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MPL 30x10x8 / N38 - lamellar magnet

lamellar magnet

Catalog no 020139

GTIN/EAN: 5906301811459

5.00

length

30 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

12.13 kg / 119.04 N

Magnetic Induction

427.56 mT / 4276 Gs

Coating

[NiCuNi] Nickel

check specifications »

10.71 ZŁ with VAT / pcs + price for transport

8.71 ZŁ net + 23% VAT / pcs

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Technical parameters - MPL 30x10x8 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x8 / N38 - lamellar magnet

properties
properties values
Cat. no. 020139
GTIN/EAN 5906301811459
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 10 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.13 kg / 119.04 N
Magnetic Induction ~ ? 427.56 mT / 4276 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x8 / 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 analysis of the assembly - data

Presented values constitute the result of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - characteristics
MPL 30x10x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4273 Gs
427.3 mT
 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
 critical level
1 mm 3683 Gs
368.3 mT
 9.01 kg / 19.86 LBS
9009.7 g / 88.4 N
 warning
2 mm 3109 Gs
310.9 mT
 6.42 kg / 14.15 LBS
6419.9 g / 63.0 N
 warning
3 mm 2600 Gs
260.0 mT
 4.49 kg / 9.90 LBS
4488.7 g / 44.0 N
 warning
5 mm 1818 Gs
181.8 mT
 2.20 kg / 4.84 LBS
2195.3 g / 21.5 N
 warning
10 mm 825 Gs
82.5 mT
 0.45 kg / 1.00 LBS
452.4 g / 4.4 N
 weak grip
15 mm 431 Gs
43.1 mT
 0.12 kg / 0.27 LBS
123.4 g / 1.2 N
 weak grip
20 mm 248 Gs
24.8 mT
 0.04 kg / 0.09 LBS
41.0 g / 0.4 N
 weak grip
30 mm 101 Gs
10.1 mT
 0.01 kg / 0.02 LBS
6.8 g / 0.1 N
 weak grip
50 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 weak grip
Pulling power decreases drastically per each millimeter of spacing. Remember that even the smallest gap (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets hold most effectively at the point of direct contact; air break nullifies the force. Notice how quickly the load capacity drop, when the product does not adhere directly to the metal substrate. When planning the arrangement, avoid unnecessary gaps.

Table 2: Vertical hold (wall)
MPL 30x10x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.43 kg / 5.35 LBS
2426.0 g / 23.8 N
1 mm Stal (~0.2) 1.80 kg / 3.97 LBS
1802.0 g / 17.7 N
2 mm Stal (~0.2) 1.28 kg / 2.83 LBS
1284.0 g / 12.6 N
3 mm Stal (~0.2) 0.90 kg / 1.98 LBS
898.0 g / 8.8 N
5 mm Stal (~0.2) 0.44 kg / 0.97 LBS
440.0 g / 4.3 N
10 mm Stal (~0.2) 0.09 kg / 0.20 LBS
90.0 g / 0.9 N
15 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below defines the approximate holding capacity sufficient to initiate the sliding of the magnet vertically against a vertical steel plate (considering typical friction). The holding force depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 30x10x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.64 kg / 8.02 LBS
3639.0 g / 35.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.43 kg / 5.35 LBS
2426.0 g / 23.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.21 kg / 2.67 LBS
1213.0 g / 11.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.07 kg / 13.37 LBS
6065.0 g / 59.5 N
When mounting a magnet on a upright plane (e.g., a board), it will maintain only approx. 20%-30% of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that magnets slide down easier than they detach. Planning a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a significantly smaller cargo. Using a rubber layer can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x10x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.61 kg / 1.34 LBS
606.5 g / 5.9 N
1 mm
13%
 1.52 kg / 3.34 LBS
1516.3 g / 14.9 N
2 mm
25%
 3.03 kg / 6.69 LBS
3032.5 g / 29.7 N
3 mm
38%
 4.55 kg / 10.03 LBS
4548.8 g / 44.6 N
5 mm
63%
 7.58 kg / 16.71 LBS
7581.3 g / 74.4 N
10 mm
100%
 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
11 mm
100%
 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
12 mm
100%
 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
A too thin steel cannot conduct the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the product shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MPL 30x10x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.13 kg / 26.74 LBS
12130.0 g / 119.0 N
 OK
40 °C -2.2% 11.86 kg / 26.15 LBS
11863.1 g / 116.4 N
 OK
60 °C -4.4% 11.60 kg / 25.57 LBS
11596.3 g / 113.8 N
80 °C -6.6% 11.33 kg / 24.98 LBS
11329.4 g / 111.1 N
100 °C -28.8% 8.64 kg / 19.04 LBS
8636.6 g / 84.7 N
Ordinary NdFeB products change their properties power above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this product. With increasing heat, the magnet's force momentarily lowers. Avoid using this magnet near heat sources exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 30x10x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 33.78 kg / 74.46 LBS
5 382 Gs
5.07 kg / 11.17 LBS
5066 g / 49.7 N
 N/A
1 mm 29.33 kg / 64.66 LBS
7 964 Gs
4.40 kg / 9.70 LBS
4399 g / 43.2 N
 26.39 kg / 58.19 LBS
~0 Gs
2 mm 25.09 kg / 55.31 LBS
7 366 Gs
3.76 kg / 8.30 LBS
3763 g / 36.9 N
 22.58 kg / 49.78 LBS
~0 Gs
3 mm 21.25 kg / 46.85 LBS
6 780 Gs
3.19 kg / 7.03 LBS
3188 g / 31.3 N
 19.13 kg / 42.17 LBS
~0 Gs
5 mm 14.97 kg / 32.99 LBS
5 689 Gs
2.24 kg / 4.95 LBS
2245 g / 22.0 N
 13.47 kg / 29.70 LBS
~0 Gs
10 mm 6.11 kg / 13.48 LBS
3 636 Gs
0.92 kg / 2.02 LBS
917 g / 9.0 N
 5.50 kg / 12.13 LBS
~0 Gs
20 mm 1.26 kg / 2.78 LBS
1 651 Gs
0.19 kg / 0.42 LBS
189 g / 1.9 N
 1.13 kg / 2.50 LBS
~0 Gs
50 mm 0.04 kg / 0.10 LBS
308 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
60 mm 0.02 kg / 0.04 LBS
203 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
70 mm 0.01 kg / 0.02 LBS
140 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
100 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
74 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
56 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet 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 striker plate. Remember that when bringing together two magnets, the impact force is extreme. The levitation is marginally weaker than the attraction, but still significant.
*Field value between like poles is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
* Estimates refer to friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x10x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.5 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a serious hazard to IT equipment and pacemakers. These NdFeB products produce a flux that destroys function of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MPL 30x10x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.78 km/h
(7.44 m/s)
 0.50 J
30 mm 45.36 km/h
(12.60 m/s)
 1.43 J
50 mm 58.54 km/h
(16.26 m/s)
 2.38 J
100 mm 82.79 km/h
(23.00 m/s)
 4.76 J
Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or injury to fingers. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 30x10x8 / 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 (Pc)
MPL 30x10x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 138 Mx 121.4 µWb
Pc Coefficient 0.51 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MPL 30x10x8 / N38

Environment Effective steel pull Effect
Air (land) 12.13 kg Standard
Water (riverbed) 13.89 kg
(+1.76 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.51

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: 020139-2026
Quick Unit Converter
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Model MPL 30x10x8 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 119.04 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.
The key to success is shifting 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 30x10x8 / 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 30x10x8 / 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 30x10x8 / 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. 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 30x10x8 / N38 model is magnetized axially (dimension 8 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 (30x10 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.
This model is characterized by dimensions 30x10x8 mm, which, at a weight of 18 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x10x8 mm and a self-weight of 18 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
  • Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to freedom in shaping and the ability to adapt to unusual requirements,
  • Versatile presence in electronics industry – they are utilized in data components, electric motors, advanced medical instruments, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The load parameter shown represents the maximum value, obtained under laboratory conditions, specifically:
  • on a block made of structural steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by even structure
  • with total lack of distance (no impurities)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

In practice, the real power depends on several key aspects, presented from the most important:
  • Distance (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be lost into the air.
  • Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
ICD Warning

Individuals with a heart stimulator must keep an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Nickel allergy

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or select coated magnets.

GPS and phone interference

GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Data carriers

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Physical harm

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

Choking Hazard

These products are not suitable for play. Swallowing several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires urgent medical intervention.

Safe operation

Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Dust explosion hazard

Dust created during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

Magnets are brittle

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?