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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

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10.71 ZŁ with VAT / pcs + price for transport

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Technical 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 assembly - technical parameters

The following data are the outcome of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these data as a reference point when designing systems.

Table 1: Static pull force (force vs gap) - 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
 strong
2 mm 3109 Gs
310.9 mT
 6.42 kg / 14.15 LBS
6419.9 g / 63.0 N
 strong
3 mm 2600 Gs
260.0 mT
 4.49 kg / 9.90 LBS
4488.7 g / 44.0 N
 strong
5 mm 1818 Gs
181.8 mT
 2.20 kg / 4.84 LBS
2195.3 g / 21.5 N
 strong
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
Pulling power decreases significantly per each millimeter of distance. Remember that even the smallest gap (e.g., contamination, varnish, dust) significantly weakens the grip. Magnets work strongest in perfect adhesion; distance drastically cuts the force. See how rapidly the pull force drop, when the magnet does not touch flatly to the metal substrate. When designing the arrangement, eliminate redundant distances.

Table 2: Shear load (vertical surface)
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 indicates the estimated force required to initiate the downward movement of the magnet downwards on a vertical metal surface (considering typical friction). This value varies with the distance between the magnet and the metal.

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
When hanging a element on a upright wall (e.g., a car body), it you can count on just approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient mean that magnets slide down faster than they detach. Designing a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a noticeably lighter cargo. Application of an anti-slip pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - 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
A thin sheet is unable to absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the product holds weaker. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - power drop
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 parameters above the temperature limit. Protect against heat – heat can permanently destroy this product. With increasing heat, the magnet's force momentarily decreases. Avoid using this product in hot environments exceeding its safe range. Too high temperature will result in destruction of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) risk losing magnetic properties sooner than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x10x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 magnetic products attract each other from a wider radius than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Calculations demonstrate friction force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - 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
Timepiece 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
Powerful magnet radiation is a large risk to electronic devices and pacemakers. These magnets generate a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
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 collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. 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)

*Warning: On a vertical surface, the magnet retains just a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*For N38 material, the safety 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
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%
Ecology and recycling (GPSR)
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
Magnet Unit Converter
Magnet pull force
Field Strength
Type data into any field, to see the rest convert on the fly.

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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. As a magnetic bar with high power (approx. 12.13 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 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 care, 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.
They constitute a key element in the production of generators and material handling systems. 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. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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 impressive 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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They have constant strength, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to weakening of magnetic properties due to external fields,
  • By covering with a shiny layer of gold, the element presents an elegant look,
  • Magnetic induction on the surface of the magnet is maximum,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to versatility in designing and the ability to adapt to unusual requirements,
  • Fundamental importance in high-tech industry – they find application in HDD drives, motor assemblies, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Magnetic strength at its maximum – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, including:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section of at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by specific conditions, such as (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Adults only

Adult use only. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Handling rules

Handle magnets consciously. Their immense force can surprise even experienced users. Stay alert and do not underestimate their power.

Fire risk

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Risk of cracking

Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them shattering into small pieces.

Life threat

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Skin irritation risks

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and wear gloves.

Serious injuries

Big blocks can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Electronic devices

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Phone sensors

Note: neodymium magnets produce a field that interferes with precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Demagnetization risk

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Safety First! Learn more about risks in the article: Magnet Safety Guide.