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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

10.71 with VAT / pcs + price for transport

8.71 ZŁ net + 23% VAT / pcs

bulk discounts:

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Strength and appearance of a neodymium magnet can be verified using our force calculator.

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Technical specification of the product - 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 modeling of the product - data

The following data represent the direct effect of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (pull 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
crushing
1 mm 3683 Gs
368.3 mT
9.01 kg / 19.86 LBS
9009.7 g / 88.4 N
medium risk
2 mm 3109 Gs
310.9 mT
6.42 kg / 14.15 LBS
6419.9 g / 63.0 N
medium risk
3 mm 2600 Gs
260.0 mT
4.49 kg / 9.90 LBS
4488.7 g / 44.0 N
medium risk
5 mm 1818 Gs
181.8 mT
2.20 kg / 4.84 LBS
2195.3 g / 21.5 N
medium risk
10 mm 825 Gs
82.5 mT
0.45 kg / 1.00 LBS
452.4 g / 4.4 N
safe
15 mm 431 Gs
43.1 mT
0.12 kg / 0.27 LBS
123.4 g / 1.2 N
safe
20 mm 248 Gs
24.8 mT
0.04 kg / 0.09 LBS
41.0 g / 0.4 N
safe
30 mm 101 Gs
10.1 mT
0.01 kg / 0.02 LBS
6.8 g / 0.1 N
safe
50 mm 28 Gs
2.8 mT
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
safe

Table 2: Sliding force (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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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

Table 4: Steel thickness (substrate influence) - power losses
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

Table 5: Thermal stability (material behavior) - 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

Table 6: Magnet-Magnet interaction (repulsion) - 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

Table 7: Safety (HSE) (electronics) - warnings
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

Table 8: Impact energy (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

Table 9: Surface protection spec
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)

Table 10: Electrical data (Pc)
MPL 30x10x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 138 Mx 121.4 µWb
Pc Coefficient 0.51 Low (Flat)

Table 11: Submerged application
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Thermal stability

*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) = 0.51

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.

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: 020139-2026
Measurement Calculator
Pulling force

Field Strength

Other offers

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x10x8 mm and a weight of 18 g, guarantees the highest quality connection. This magnetic block with a force of 119.04 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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 two-component adhesives (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 roughen and wash 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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 10 mm (width), and 8 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 12.13 kg (force ~119.04 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (based on simulations),
  • They have excellent resistance to magnetism drop when exposed to external magnetic sources,
  • Thanks to the smooth finish, the coating of nickel, gold-plated, or silver-plated gives an professional appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in shaping and the ability to modify to client solutions,
  • Fundamental importance in advanced technology sectors – they are utilized in hard drives, electromotive mechanisms, precision medical tools, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. 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 power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force is the result of a measurement for optimal configuration, assuming:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding may be lower depending on the following factors, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Warnings
Eye protection

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

Precision electronics

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and GPS.

Metal Allergy

Studies show that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for versions in plastic housing.

Implant safety

People with a heart stimulator should maintain an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Powerful field

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

Electronic hazard

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Operating temperature

Do not overheat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Mechanical processing

Powder generated during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Product not for children

Absolutely keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are fatal.

Warning! Learn more about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98