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MPL 15x2x30 / N38 - lamellar magnet

lamellar magnet

Catalog no 020121

GTIN/EAN: 5906301811275

5.00

length

15 mm [±0,1 mm]

Width

2 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

→ diametrical

Load capacity

0.68 kg / 6.68 N

Magnetic Induction

614.34 mT / 6143 Gs

Coating

[NiCuNi] Nickel

4.75 with VAT / pcs + price for transport

3.86 ZŁ net + 23% VAT / pcs

bulk discounts:

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Physical properties - MPL 15x2x30 / N38 - lamellar magnet

Specification / characteristics - MPL 15x2x30 / N38 - lamellar magnet

properties
properties values
Cat. no. 020121
GTIN/EAN 5906301811275
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 15 mm [±0,1 mm]
Width 2 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction → diametrical
Load capacity ~ ? 0.68 kg / 6.68 N
Magnetic Induction ~ ? 614.34 mT / 6143 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 15x2x30 / 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

Physical analysis of the product - report

Presented data constitute the result of a engineering simulation. Values rely on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MPL 15x2x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6128 Gs
612.8 mT
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
weak grip
1 mm 3036 Gs
303.6 mT
0.17 kg / 0.37 lbs
166.8 g / 1.6 N
weak grip
2 mm 1736 Gs
173.6 mT
0.05 kg / 0.12 lbs
54.5 g / 0.5 N
weak grip
3 mm 1150 Gs
115.0 mT
0.02 kg / 0.05 lbs
23.9 g / 0.2 N
weak grip
5 mm 623 Gs
62.3 mT
0.01 kg / 0.02 lbs
7.0 g / 0.1 N
weak grip
10 mm 218 Gs
21.8 mT
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
weak grip
15 mm 103 Gs
10.3 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
weak grip
20 mm 58 Gs
5.8 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
weak grip
30 mm 24 Gs
2.4 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Slippage capacity (wall)
MPL 15x2x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 lbs
136.0 g / 1.3 N
1 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 15x2x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 0.45 lbs
204.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 lbs
136.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 lbs
68.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.75 lbs
340.0 g / 3.3 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 15x2x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.07 kg / 0.15 lbs
68.0 g / 0.7 N
1 mm
25%
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
2 mm
50%
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
3 mm
75%
0.51 kg / 1.12 lbs
510.0 g / 5.0 N
5 mm
100%
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
10 mm
100%
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
11 mm
100%
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
12 mm
100%
0.68 kg / 1.50 lbs
680.0 g / 6.7 N

Table 5: Thermal stability (stability) - power drop
MPL 15x2x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
OK
40 °C -2.2% 0.67 kg / 1.47 lbs
665.0 g / 6.5 N
OK
60 °C -4.4% 0.65 kg / 1.43 lbs
650.1 g / 6.4 N
OK
80 °C -6.6% 0.64 kg / 1.40 lbs
635.1 g / 6.2 N
100 °C -28.8% 0.48 kg / 1.07 lbs
484.2 g / 4.7 N

Table 6: Two magnets (attraction) - field range
MPL 15x2x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 6.95 kg / 15.31 lbs
6 152 Gs
1.04 kg / 2.30 lbs
1042 g / 10.2 N
N/A
1 mm 3.45 kg / 7.62 lbs
8 643 Gs
0.52 kg / 1.14 lbs
518 g / 5.1 N
3.11 kg / 6.85 lbs
~0 Gs
2 mm 1.70 kg / 3.76 lbs
6 071 Gs
0.26 kg / 0.56 lbs
256 g / 2.5 N
1.53 kg / 3.38 lbs
~0 Gs
3 mm 0.93 kg / 2.05 lbs
4 482 Gs
0.14 kg / 0.31 lbs
139 g / 1.4 N
0.84 kg / 1.84 lbs
~0 Gs
5 mm 0.36 kg / 0.79 lbs
2 788 Gs
0.05 kg / 0.12 lbs
54 g / 0.5 N
0.32 kg / 0.71 lbs
~0 Gs
10 mm 0.07 kg / 0.16 lbs
1 247 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
0.06 kg / 0.14 lbs
~0 Gs
20 mm 0.01 kg / 0.02 lbs
435 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
71 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
47 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
33 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
24 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
18 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
14 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - warnings
MPL 15x2x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (cracking risk) - warning
MPL 15x2x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 10.13 km/h
(2.81 m/s)
0.03 J
30 mm 17.53 km/h
(4.87 m/s)
0.08 J
50 mm 22.63 km/h
(6.29 m/s)
0.13 J
100 mm 32.01 km/h
(8.89 m/s)
0.27 J

Table 9: Surface protection spec
MPL 15x2x30 / 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: Construction data (Flux)
MPL 15x2x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 210 Mx 22.1 µWb
Pc Coefficient 1.54 High (Stable)

Table 11: Physics of underwater searching
MPL 15x2x30 / N38

Environment Effective steel pull Effect
Air (land) 0.68 kg Standard
Water (riverbed) 0.78 kg
(+0.10 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens 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) = 1.54

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.

Technical specification and ecology
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%
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: 020121-2026
Measurement Calculator
Pulling force

Magnetic Field

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 15x2x30 mm and a weight of 6.75 g, guarantees premium class connection. As a magnetic bar with high power (approx. 0.68 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, 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 0.68 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 15x2x30 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 15x2x30 / N38 model is magnetized axially (dimension 30 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 (15x2 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 15x2x30 mm, which, at a weight of 6.75 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 0.68 kg (force ~6.68 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Benefits

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • Their strength is durable, and after approximately 10 years it drops only by ~1% (according to research),
  • They have excellent resistance to magnetism drop as a result of external magnetic sources,
  • A magnet with a metallic gold surface has an effective appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
  • In view of the ability of accurate forming and customization to custom requirements, magnetic components can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
  • Universal use in modern technologies – they serve a role in magnetic memories, electric motors, medical equipment, and modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their power 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 oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • on a plate made of structural steel, effectively closing the magnetic field
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In practice, the real power is determined by a number of factors, listed from crucial:
  • Distance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

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. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Magnets are brittle

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Health Danger

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

Heat warning

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Nickel coating and allergies

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for coated magnets.

Do not underestimate power

Be careful. Neodymium magnets act from a distance and snap with huge force, often quicker than you can react.

This is not a toy

NdFeB magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Dust explosion hazard

Dust produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Precision electronics

Be aware: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.

Crushing force

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Cards and drives

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Warning! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98