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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

technical parameters »

10.71 ZŁ with VAT / pcs + price for transport

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Technical - 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

Engineering simulation of the magnet - technical parameters

The following data represent the outcome of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - power drop
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
Magnetic force weakens significantly with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., dirt, varnish, rust) noticeably reduces the pull force. Magnetic products work optimally during direct contact; gap kills the power. Observe how quickly the load capacity plummet, when the product does not adhere flatly to the steel surface. When designing the assembly, eliminate additional spacers.

Table 2: Slippage 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
The following data presents the theoretical shear load necessary to initiate the shifting of the magnet down along a vertical steel plate (considering typical friction coefficient). This value varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 placing a magnet on a upright surface (e.g., a car body), it you can count on only about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip mean that magnets move down easier than they detach. Planning a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter cargo. Using a rubber pad can drastically improve the result.

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 thin metal plate is incapable of conduct the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze 100% of this neodymium's power, you require a sufficiently solid backing of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the product works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (stability) - thermal limit
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
Classic neodymiums change their properties parameters above the temperature limit. Protect against heat – high temperature can irreversibly demagnetize this magnet. With increasing heat, the neodymium's capacity temporarily lowers. Refrain from using this magnet in hot environments exceeding its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnets attract each other from a much further distance than a neodymium and metal setup. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the impact force is massive. The levitation is slightly lower than the connection force, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Estimates apply to friction force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Car key 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
Extremely neodym field poses a real danger to electronics as well as medical implants. These magnets produce a field that destroys function of digital equipment. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - 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 very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when working with powerful specimens.

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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

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. Key data when building generators as well as sensors. Pc value determines the magnet's operating point.

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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just a fraction of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*For N38 material, 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
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
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MPL 10x5x1.5 / N38 - lamellar magnet
Product available Ships tomorrow

MPL 10x5x1.5 / N38 - lamellar magnet

0.381 ZŁ brutto / pcs
This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 30x10x8 mm and a weight of 18 g, guarantees premium class connection. This rectangular block with a force of 119.04 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects 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. Watch your fingers! Magnets with a force of 12.13 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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 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.
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 protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • In other words, due to the metallic layer of nickel, the element looks attractive,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Considering the potential of flexible molding and customization to custom needs, neodymium magnets can be created in a wide range of forms and dimensions, which increases their versatility,
  • Universal use in modern industrial fields – they find application in mass storage devices, electric motors, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited possibility of creating threads in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power was defined for optimal configuration, taking into account:
  • using a sheet made of mild steel, serving as a circuit closing element
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • with total lack of distance (without impurities)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

In real-world applications, the real power depends on many variables, ranked from most significant:
  • 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 varnish, rust or dirt).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with neodymium magnets
Impact on smartphones

A powerful magnetic field interferes with the operation of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.

Magnetic media

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Adults only

Always store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.

Respect the power

Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.

Shattering risk

NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them cracking into small pieces.

Power loss in heat

Control the heat. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Warning for allergy sufferers

Medical facts indicate that nickel (the usual finish) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and select encased magnets.

Implant safety

People with a ICD should maintain an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.

Flammability

Powder created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Finger safety

Risk of injury: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Important! Looking for details? Check our post: Why are neodymium magnets dangerous?