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MPL 30x5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020448

GTIN/EAN: 5906301811923

length

30 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

7.03 kg / 68.96 N

Magnetic Induction

446.27 mT / 4463 Gs

Coating

[NiCuNi] Nickel

4.15 with VAT / pcs + price for transport

3.37 ZŁ net + 23% VAT / pcs

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Strength along with appearance of a neodymium magnet can be checked using our force calculator.

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Physical properties - MPL 30x5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020448
GTIN/EAN 5906301811923
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 5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.03 kg / 68.96 N
Magnetic Induction ~ ? 446.27 mT / 4463 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x5x5 / 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 simulation of the magnet - report

The following data constitute the result of a mathematical simulation. Results rely on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - power drop
MPL 30x5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4458 Gs
445.8 mT
7.03 kg / 15.50 pounds
7030.0 g / 69.0 N
warning
1 mm 3235 Gs
323.5 mT
3.70 kg / 8.16 pounds
3702.2 g / 36.3 N
warning
2 mm 2271 Gs
227.1 mT
1.82 kg / 4.02 pounds
1825.0 g / 17.9 N
safe
3 mm 1628 Gs
162.8 mT
0.94 kg / 2.07 pounds
937.0 g / 9.2 N
safe
5 mm 927 Gs
92.7 mT
0.30 kg / 0.67 pounds
304.2 g / 3.0 N
safe
10 mm 342 Gs
34.2 mT
0.04 kg / 0.09 pounds
41.4 g / 0.4 N
safe
15 mm 166 Gs
16.6 mT
0.01 kg / 0.02 pounds
9.7 g / 0.1 N
safe
20 mm 92 Gs
9.2 mT
0.00 kg / 0.01 pounds
3.0 g / 0.0 N
safe
30 mm 36 Gs
3.6 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
safe
50 mm 9 Gs
0.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Vertical hold (wall)
MPL 30x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.41 kg / 3.10 pounds
1406.0 g / 13.8 N
1 mm Stal (~0.2) 0.74 kg / 1.63 pounds
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.36 kg / 0.80 pounds
364.0 g / 3.6 N
3 mm Stal (~0.2) 0.19 kg / 0.41 pounds
188.0 g / 1.8 N
5 mm Stal (~0.2) 0.06 kg / 0.13 pounds
60.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 30x5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.11 kg / 4.65 pounds
2109.0 g / 20.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.41 kg / 3.10 pounds
1406.0 g / 13.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.70 kg / 1.55 pounds
703.0 g / 6.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.52 kg / 7.75 pounds
3515.0 g / 34.5 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.70 kg / 1.55 pounds
703.0 g / 6.9 N
1 mm
25%
1.76 kg / 3.87 pounds
1757.5 g / 17.2 N
2 mm
50%
3.52 kg / 7.75 pounds
3515.0 g / 34.5 N
3 mm
75%
5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
5 mm
100%
7.03 kg / 15.50 pounds
7030.0 g / 69.0 N
10 mm
100%
7.03 kg / 15.50 pounds
7030.0 g / 69.0 N
11 mm
100%
7.03 kg / 15.50 pounds
7030.0 g / 69.0 N
12 mm
100%
7.03 kg / 15.50 pounds
7030.0 g / 69.0 N

Table 5: Working in heat (stability) - power drop
MPL 30x5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.03 kg / 15.50 pounds
7030.0 g / 69.0 N
OK
40 °C -2.2% 6.88 kg / 15.16 pounds
6875.3 g / 67.4 N
OK
60 °C -4.4% 6.72 kg / 14.82 pounds
6720.7 g / 65.9 N
80 °C -6.6% 6.57 kg / 14.48 pounds
6566.0 g / 64.4 N
100 °C -28.8% 5.01 kg / 11.03 pounds
5005.4 g / 49.1 N

Table 6: Two magnets (attraction) - field range
MPL 30x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.38 kg / 40.52 pounds
5 383 Gs
2.76 kg / 6.08 pounds
2757 g / 27.0 N
N/A
1 mm 13.60 kg / 29.99 pounds
7 670 Gs
2.04 kg / 4.50 pounds
2040 g / 20.0 N
12.24 kg / 26.99 pounds
~0 Gs
2 mm 9.68 kg / 21.34 pounds
6 470 Gs
1.45 kg / 3.20 pounds
1452 g / 14.2 N
8.71 kg / 19.20 pounds
~0 Gs
3 mm 6.79 kg / 14.97 pounds
5 419 Gs
1.02 kg / 2.25 pounds
1018 g / 10.0 N
6.11 kg / 13.47 pounds
~0 Gs
5 mm 3.39 kg / 7.48 pounds
3 830 Gs
0.51 kg / 1.12 pounds
509 g / 5.0 N
3.05 kg / 6.73 pounds
~0 Gs
10 mm 0.80 kg / 1.75 pounds
1 855 Gs
0.12 kg / 0.26 pounds
119 g / 1.2 N
0.72 kg / 1.58 pounds
~0 Gs
20 mm 0.11 kg / 0.24 pounds
684 Gs
0.02 kg / 0.04 pounds
16 g / 0.2 N
0.10 kg / 0.21 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
111 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
72 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
49 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
34 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
25 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
19 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MPL 30x5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 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

Table 8: Collisions (kinetic energy) - warning
MPL 30x5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 35.77 km/h
(9.94 m/s)
0.28 J
30 mm 61.73 km/h
(17.15 m/s)
0.83 J
50 mm 79.69 km/h
(22.14 m/s)
1.38 J
100 mm 112.70 km/h
(31.30 m/s)
2.76 J

Table 9: Coating parameters (durability)
MPL 30x5x5 / 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 (Flux)
MPL 30x5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 700 Mx 57.0 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Submerged application
MPL 30x5x5 / N38

Environment Effective steel pull Effect
Air (land) 7.03 kg Standard
Water (riverbed) 8.05 kg
(+1.02 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Note: On a vertical surface, the magnet holds just ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) drastically reduces 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) = 0.46

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.

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: 020448-2026
Quick Unit Converter
Force (pull)

Field Strength

Check out more products

Component MPL 30x5x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 7.03 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 sliding 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 30x5x5 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 30x5x5 / 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 workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 30x5x5 / N38, it is best to use strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 30x5x5 / N38 model is magnetized through the thickness (dimension 5 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 (30x5 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), 5 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 7.03 kg (force ~68.96 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • They are resistant to demagnetization induced by external magnetic fields,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the working layer of the magnet turns out to be impressive,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in forming and the capacity to customize to client solutions,
  • Huge importance in electronics industry – they are commonly used in data components, motor assemblies, precision medical tools, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making nuts in the magnet and complex shapes - recommended is cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

The declared magnet strength refers to the maximum value, recorded under ideal test conditions, specifically:
  • on a block made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by specific conditions, such as (from priority):
  • Gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Handling rules

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets leads to them cracking into shards.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Warning for allergy sufferers

Studies show that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands and opt for versions in plastic housing.

Crushing risk

Large magnets can crush fingers instantly. Do not place your hand between two attracting surfaces.

Adults only

Always store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are tragic.

Medical interference

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Fire risk

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Protect data

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

Impact on smartphones

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Danger! Details 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