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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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Technical - 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 modeling of the product - technical parameters

These information are the result of a engineering calculation. Results are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a reference point when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
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 lbs
7030.0 g / 69.0 N
warning
1 mm 3235 Gs
323.5 mT
3.70 kg / 8.16 lbs
3702.2 g / 36.3 N
warning
2 mm 2271 Gs
227.1 mT
1.82 kg / 4.02 lbs
1825.0 g / 17.9 N
low risk
3 mm 1628 Gs
162.8 mT
0.94 kg / 2.07 lbs
937.0 g / 9.2 N
low risk
5 mm 927 Gs
92.7 mT
0.30 kg / 0.67 lbs
304.2 g / 3.0 N
low risk
10 mm 342 Gs
34.2 mT
0.04 kg / 0.09 lbs
41.4 g / 0.4 N
low risk
15 mm 166 Gs
16.6 mT
0.01 kg / 0.02 lbs
9.7 g / 0.1 N
low risk
20 mm 92 Gs
9.2 mT
0.00 kg / 0.01 lbs
3.0 g / 0.0 N
low risk
30 mm 36 Gs
3.6 mT
0.00 kg / 0.00 lbs
0.5 g / 0.0 N
low risk
50 mm 9 Gs
0.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Shear force (vertical surface)
MPL 30x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.41 kg / 3.10 lbs
1406.0 g / 13.8 N
1 mm Stal (~0.2) 0.74 kg / 1.63 lbs
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.36 kg / 0.80 lbs
364.0 g / 3.6 N
3 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
5 mm Stal (~0.2) 0.06 kg / 0.13 lbs
60.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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: 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 lbs
2109.0 g / 20.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.41 kg / 3.10 lbs
1406.0 g / 13.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.70 kg / 1.55 lbs
703.0 g / 6.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.52 kg / 7.75 lbs
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 lbs
703.0 g / 6.9 N
1 mm
25%
1.76 kg / 3.87 lbs
1757.5 g / 17.2 N
2 mm
50%
3.52 kg / 7.75 lbs
3515.0 g / 34.5 N
3 mm
75%
5.27 kg / 11.62 lbs
5272.5 g / 51.7 N
5 mm
100%
7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
10 mm
100%
7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
11 mm
100%
7.03 kg / 15.50 lbs
7030.0 g / 69.0 N
12 mm
100%
7.03 kg / 15.50 lbs
7030.0 g / 69.0 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 30x5x5 / N38

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

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 30x5x5 / N38

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

Table 7: Safety (HSE) (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
Phone / Smartphone 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: Dynamics (kinetic energy) - collision effects
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: Anti-corrosion coating 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: Construction data (Pc)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

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

2. Steel saturation

*Thin steel (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) = 0.46

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 and environmental data
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%
Sustainability
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
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Component MPL 30x5x5 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 68.96 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 7.03 kg can pinch very hard and cause hematomas. 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 filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 7.03 kg), they are ideal as hidden locks 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).
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 30x5x5 mm, which, at a weight of 5.63 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 30x5x5 mm and a self-weight of 5.63 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • Thanks to the elegant finish, the layer of nickel, gold, or silver gives an modern appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
  • Thanks to the option of precise forming and adaptation to specialized needs, magnetic components can be modeled in a variety of geometric configurations, which increases their versatility,
  • Universal use in innovative solutions – they serve a role in mass storage devices, electric drive systems, diagnostic systems, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a measurement result executed under specific, ideal conditions:
  • on a base made of structural steel, optimally conducting the magnetic field
  • with a cross-section no less than 10 mm
  • with a surface cleaned and smooth
  • with zero gap (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

It is worth knowing that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Data carriers

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Impact on smartphones

Remember: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Handling rules

Handle with care. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can move away.

Do not give to children

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

Do not drill into magnets

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

Heat sensitivity

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Nickel allergy

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If your skin reacts to metals, avoid direct skin contact or opt for coated magnets.

Warning for heart patients

For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.

Fragile material

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Finger safety

Large magnets can break fingers instantly. Do not put your hand betwixt two attracting surfaces.

Important! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98