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MPL 7x7x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020176

GTIN/EAN: 5906301811824

5.00

length

7 mm [±0,1 mm]

Width

7 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.1 g

Magnetization Direction

↑ axial

Load capacity

1.60 kg / 15.70 N

Magnetic Induction

376.99 mT / 3770 Gs

Coating

[NiCuNi] Nickel

0.541 with VAT / pcs + price for transport

0.440 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical specification - MPL 7x7x3 / N38 - lamellar magnet

Specification / characteristics - MPL 7x7x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020176
GTIN/EAN 5906301811824
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 7 mm [±0,1 mm]
Width 7 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.1 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.60 kg / 15.70 N
Magnetic Induction ~ ? 376.99 mT / 3770 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 7x7x3 / 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 constitute the direct effect of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static force (force vs distance) - power drop
MPL 7x7x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3767 Gs
376.7 mT
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
safe
1 mm 2886 Gs
288.6 mT
0.94 kg / 2.07 pounds
939.5 g / 9.2 N
safe
2 mm 2048 Gs
204.8 mT
0.47 kg / 1.04 pounds
472.8 g / 4.6 N
safe
3 mm 1412 Gs
141.2 mT
0.22 kg / 0.50 pounds
224.8 g / 2.2 N
safe
5 mm 686 Gs
68.6 mT
0.05 kg / 0.12 pounds
53.0 g / 0.5 N
safe
10 mm 165 Gs
16.5 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
safe
15 mm 60 Gs
6.0 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
safe
20 mm 28 Gs
2.8 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Slippage hold (vertical surface)
MPL 7x7x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
1 mm Stal (~0.2) 0.19 kg / 0.41 pounds
188.0 g / 1.8 N
2 mm Stal (~0.2) 0.09 kg / 0.21 pounds
94.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 7x7x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.48 kg / 1.06 pounds
480.0 g / 4.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.80 kg / 1.76 pounds
800.0 g / 7.8 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 7x7x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
1 mm
25%
0.40 kg / 0.88 pounds
400.0 g / 3.9 N
2 mm
50%
0.80 kg / 1.76 pounds
800.0 g / 7.8 N
3 mm
75%
1.20 kg / 2.65 pounds
1200.0 g / 11.8 N
5 mm
100%
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
10 mm
100%
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
11 mm
100%
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
12 mm
100%
1.60 kg / 3.53 pounds
1600.0 g / 15.7 N

Table 5: Working in heat (material behavior) - power drop
MPL 7x7x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.60 kg / 3.53 pounds
1600.0 g / 15.7 N
OK
40 °C -2.2% 1.56 kg / 3.45 pounds
1564.8 g / 15.4 N
OK
60 °C -4.4% 1.53 kg / 3.37 pounds
1529.6 g / 15.0 N
80 °C -6.6% 1.49 kg / 3.29 pounds
1494.4 g / 14.7 N
100 °C -28.8% 1.14 kg / 2.51 pounds
1139.2 g / 11.2 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 7x7x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.29 kg / 9.45 pounds
5 173 Gs
0.64 kg / 1.42 pounds
643 g / 6.3 N
N/A
1 mm 3.38 kg / 7.44 pounds
6 685 Gs
0.51 kg / 1.12 pounds
506 g / 5.0 N
3.04 kg / 6.70 pounds
~0 Gs
2 mm 2.52 kg / 5.55 pounds
5 773 Gs
0.38 kg / 0.83 pounds
378 g / 3.7 N
2.27 kg / 4.99 pounds
~0 Gs
3 mm 1.81 kg / 3.99 pounds
4 893 Gs
0.27 kg / 0.60 pounds
271 g / 2.7 N
1.63 kg / 3.59 pounds
~0 Gs
5 mm 0.88 kg / 1.93 pounds
3 405 Gs
0.13 kg / 0.29 pounds
131 g / 1.3 N
0.79 kg / 1.74 pounds
~0 Gs
10 mm 0.14 kg / 0.31 pounds
1 372 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
0.13 kg / 0.28 pounds
~0 Gs
20 mm 0.01 kg / 0.02 pounds
329 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
30 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
18 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
12 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
8 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
6 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
4 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 7x7x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 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) - collision effects
MPL 7x7x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 38.51 km/h
(10.70 m/s)
0.06 J
30 mm 66.62 km/h
(18.51 m/s)
0.19 J
50 mm 86.01 km/h
(23.89 m/s)
0.31 J
100 mm 121.63 km/h
(33.79 m/s)
0.63 J

Table 9: Coating parameters (durability)
MPL 7x7x3 / 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 7x7x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 909 Mx 19.1 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 7x7x3 / N38

Environment Effective steel pull Effect
Air (land) 1.60 kg Standard
Water (riverbed) 1.83 kg
(+0.23 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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
Chemical composition
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%
Ecology and recycling (GPSR)
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: 020176-2026
Measurement Calculator
Magnet pull force

Magnetic Field

Other products

Component MPL 7x7x3 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 1.60 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 7x7x3 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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 7x7x3 / 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. 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 7x7x3 / N38, it is best to use strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 7x7x3 / N38 model is magnetized through the thickness (dimension 3 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 7x7x3 mm, which, at a weight of 1.1 g, makes it an element with high energy density. It is a magnetic block with dimensions 7x7x3 mm and a self-weight of 1.1 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • By using a reflective layer of gold, the element acquires an professional look,
  • Magnetic induction on the working layer of the magnet remains very high,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Due to the possibility of precise molding and adaptation to custom requirements, magnetic components can be produced in a broad palette of forms and dimensions, which expands the range of possible applications,
  • Huge importance in future technologies – they are utilized in magnetic memories, drive modules, advanced medical instruments, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Maximum magnetic pulling forcewhat affects it?

Holding force of 1.60 kg is a theoretical maximum value performed under specific, ideal conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section no less than 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by specific conditions, such as (from most important):
  • Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Warnings
Finger safety

Pinching hazard: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Mechanical processing

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

GPS Danger

GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Product not for children

Strictly store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.

Demagnetization risk

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Warning for allergy sufferers

Some people have a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in dermatitis. It is best to use protective gloves.

Risk of cracking

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Cards and drives

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Handling guide

Handle magnets consciously. Their huge power can surprise even experienced users. Plan your moves and respect their power.

Danger to pacemakers

People with a ICD have to keep an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Danger! Need more info? Read our article: Are neodymium magnets dangerous?