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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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Detailed specification - 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

Technical simulation of the magnet - data

The following data represent the direct effect of a physical analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Please consider these data as a preliminary roadmap during assembly planning.

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

Table 2: Vertical 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 (sliding) - 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) - sheet metal selection
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 stability (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 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: Two magnets (repulsion) - field range
MPL 30x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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) (implants) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 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

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: 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: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Temperature resistance

*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

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%
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
Magnet Unit Converter
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 30x5x5 mm and a weight of 5.63 g, guarantees premium class connection. As a block magnet with high power (approx. 7.03 kg), this product is available off-the-shelf 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 shifting 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. Watch your fingers! Magnets with a force of 7.03 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 30x5x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 5 mm (width), and 5 mm (thickness). 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 and disadvantages of Nd2Fe14B magnets.

Benefits

Apart from their strong holding force, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a smooth silver surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in forming and the ability to customize to client solutions,
  • Wide application in modern industrial fields – they are commonly used in mass storage devices, motor assemblies, medical equipment, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their 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 immune to moisture, when using outdoors
  • We recommend casing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these products can complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength refers to the maximum value, recorded under laboratory conditions, namely:
  • using a sheet made of mild steel, functioning as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Effective lifting capacity impacted by specific conditions, including (from most important):
  • Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Allergic reactions

Some people suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in a rash. We suggest use safety gloves.

Hand protection

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Danger to the youngest

Only for adults. Small elements pose a choking risk, leading to serious injuries. Keep away from kids and pets.

Safe distance

Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Mechanical processing

Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Permanent damage

Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.

Do not underestimate power

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can react.

Phone sensors

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Maintain magnets close to a device to prevent breaking the sensors.

Protective goggles

NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them breaking into small pieces.

Medical interference

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

Important! Need more info? Read our article: Why are neodymium magnets dangerous?