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MPL 30x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

↑ axial

Load capacity

2.11 kg / 20.69 N

Magnetic Induction

115.11 mT / 1151 Gs

Coating

[NiCuNi] Nickel

see technical data »

3.89 ZŁ with VAT / pcs + price for transport

3.16 ZŁ net + 23% VAT / pcs

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Technical - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020140
GTIN/EAN 5906301811466
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 2 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.11 kg / 20.69 N
Magnetic Induction ~ ? 115.11 mT / 1151 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / 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 - technical parameters

Presented data are the outcome of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 30x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1151 Gs
115.1 mT
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
 medium risk
1 mm 1098 Gs
109.8 mT
 1.92 kg / 4.23 lbs
1920.5 g / 18.8 N
 low risk
2 mm 1019 Gs
101.9 mT
 1.65 kg / 3.65 lbs
1654.9 g / 16.2 N
 low risk
3 mm 926 Gs
92.6 mT
 1.37 kg / 3.01 lbs
1365.9 g / 13.4 N
 low risk
5 mm 733 Gs
73.3 mT
 0.86 kg / 1.89 lbs
855.2 g / 8.4 N
 low risk
10 mm 379 Gs
37.9 mT
 0.23 kg / 0.50 lbs
228.8 g / 2.2 N
 low risk
15 mm 203 Gs
20.3 mT
 0.07 kg / 0.14 lbs
65.6 g / 0.6 N
 low risk
20 mm 116 Gs
11.6 mT
 0.02 kg / 0.05 lbs
21.6 g / 0.2 N
 low risk
30 mm 46 Gs
4.6 mT
 0.00 kg / 0.01 lbs
3.4 g / 0.0 N
 low risk
50 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
Pulling power drops significantly with every mm of spacing. Remember that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably weakens the grip. Neodymiums operate strongest during direct contact; air break weakens the power. Notice how flashily the parameters drop, when the magnet does not touch tightly to the metal substrate. When planning the arrangement, discard redundant distances.

Table 2: Sliding capacity (vertical surface)
MPL 30x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.42 kg / 0.93 lbs
422.0 g / 4.1 N
1 mm Stal (~0.2) 0.38 kg / 0.85 lbs
384.0 g / 3.8 N
2 mm Stal (~0.2) 0.33 kg / 0.73 lbs
330.0 g / 3.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.17 kg / 0.38 lbs
172.0 g / 1.7 N
10 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the estimated weight limit needed to cause the downward movement of the magnet downwards on a vertical steel plate (considering typical friction coefficient). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 30x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.63 kg / 1.40 lbs
633.0 g / 6.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
When mounting a magnet on a vertical plane (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that products slide down easier than they detach. Planning a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter cargo. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.21 kg / 0.47 lbs
211.0 g / 2.1 N
1 mm
25%
 0.53 kg / 1.16 lbs
527.5 g / 5.2 N
2 mm
50%
 1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
3 mm
75%
 1.58 kg / 3.49 lbs
1582.5 g / 15.5 N
5 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
10 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
11 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
12 mm
100%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
A too thin steel is not enough to focus the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick piece of steel. The saturation effect means that on delicate walls (e.g., car bodies), the product shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MPL 30x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
 OK
40 °C -2.2% 2.06 kg / 4.55 lbs
2063.6 g / 20.2 N
 OK
60 °C -4.4% 2.02 kg / 4.45 lbs
2017.2 g / 19.8 N
80 °C -6.6% 1.97 kg / 4.34 lbs
1970.7 g / 19.3 N
100 °C -28.8% 1.50 kg / 3.31 lbs
1502.3 g / 14.7 N
Standard neodymium magnets change their properties strength above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily lowers. Do not use this product close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will result in destruction of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently sooner than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.67 kg / 8.10 lbs
2 169 Gs
0.55 kg / 1.22 lbs
551 g / 5.4 N
 N/A
1 mm 3.53 kg / 7.79 lbs
2 257 Gs
0.53 kg / 1.17 lbs
530 g / 5.2 N
 3.18 kg / 7.01 lbs
~0 Gs
2 mm 3.34 kg / 7.37 lbs
2 196 Gs
0.50 kg / 1.11 lbs
502 g / 4.9 N
 3.01 kg / 6.64 lbs
~0 Gs
3 mm 3.12 kg / 6.89 lbs
2 122 Gs
0.47 kg / 1.03 lbs
469 g / 4.6 N
 2.81 kg / 6.20 lbs
~0 Gs
5 mm 2.63 kg / 5.80 lbs
1 948 Gs
0.39 kg / 0.87 lbs
395 g / 3.9 N
 2.37 kg / 5.22 lbs
~0 Gs
10 mm 1.49 kg / 3.28 lbs
1 465 Gs
0.22 kg / 0.49 lbs
223 g / 2.2 N
 1.34 kg / 2.96 lbs
~0 Gs
20 mm 0.40 kg / 0.88 lbs
758 Gs
0.06 kg / 0.13 lbs
60 g / 0.6 N
 0.36 kg / 0.79 lbs
~0 Gs
50 mm 0.01 kg / 0.03 lbs
142 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
60 mm 0.01 kg / 0.01 lbs
92 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.01 lbs
63 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
44 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
32 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
24 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 setup. The connection of two magnets generates a stronger field and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is massive. The levitation is marginally weaker than the connection force, but still large.
*Field value in repulsion mode drops to ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Note: Estimates apply to friction force of two matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MPL 30x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a real danger to IT equipment and pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MPL 30x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.00 km/h
(5.28 m/s)
 0.09 J
30 mm 30.91 km/h
(8.59 m/s)
 0.25 J
50 mm 39.87 km/h
(11.08 m/s)
 0.41 J
100 mm 56.39 km/h
(15.66 m/s)
 0.83 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MPL 30x15x2 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 30x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 236 Mx 62.4 µWb
Pc Coefficient 0.13 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 30x15x2 / N38

Environment Effective steel pull Effect
Air (land) 2.11 kg Standard
Water (riverbed) 2.42 kg
(+0.31 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Shear force

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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.

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%
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: 020140-2026
Quick Unit Converter
Pulling force
Magnetic Induction
Input a value in a box, and the remaining units change on the fly.

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Component MPL 30x15x2 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 20.69 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. Watch your fingers! Magnets with a force of 2.11 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. Thanks to the flat surface and high force (approx. 2.11 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 30x15x2 / N38 model is magnetized through the thickness (dimension 2 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 (30x15 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.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 15 mm (width), and 2 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 2.11 kg (force ~20.69 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Benefits

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under strong external field,
  • Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the ability of flexible shaping and adaptation to individualized needs, NdFeB magnets can be produced in a broad palette of forms and dimensions, which increases their versatility,
  • Universal use in high-tech industry – they are used in hard drives, electric motors, diagnostic systems, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Maximum magnetic pulling force – what affects it?

The load parameter shown refers to the peak performance, recorded under laboratory conditions, meaning:
  • on a block made of structural steel, effectively closing the magnetic flux
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • with direct contact (no paint)
  • under axial force direction (90-degree angle)
  • at room temperature

Practical lifting capacity: influencing factors

In practice, the real power is determined by many variables, ranked from most significant:
  • Distance – the presence of foreign body (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Avoid contact if allergic

Studies show that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from touching magnets with bare hands or select versions in plastic housing.

Phone sensors

A powerful magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a smartphone to avoid breaking the sensors.

No play value

Product intended for adults. Tiny parts can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

Eye protection

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Fire risk

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Heat warning

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Safe operation

Handle magnets with awareness. Their powerful strength can shock even professionals. Stay alert and respect their force.

Hand protection

Big blocks can break fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Electronic devices

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

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