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MPL 3x3x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020148

GTIN/EAN: 5906301811541

5.00
Load capacity 0.34 kg / 3.37 N Magnetic Induction 538.48 mT / 5385 Gs
length
3 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.2 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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0.1500 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical - MPL 3x3x3 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020148
GTIN/EAN 5906301811541
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 3 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 0.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.34 kg / 3.37 N
Magnetic Induction ~ ? 538.48 mT / 5385 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x3 / 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

Engineering modeling of the magnet - technical parameters

Presented information are the outcome of a engineering calculation. Results rely on models for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - interaction chart
MPL 3x3x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5372 Gs
537.2 mT
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
weak grip
1 mm 2530 Gs
253.0 mT
0.08 kg / 0.17 LBS
75.4 g / 0.7 N
weak grip
2 mm 1127 Gs
112.7 mT
0.01 kg / 0.03 LBS
15.0 g / 0.1 N
weak grip
3 mm 562 Gs
56.2 mT
0.00 kg / 0.01 LBS
3.7 g / 0.0 N
weak grip
5 mm 192 Gs
19.2 mT
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
weak grip
10 mm 35 Gs
3.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
15 mm 12 Gs
1.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
20 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
30 mm 2 Gs
0.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Sliding load (wall)
MPL 3x3x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.15 LBS
68.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
2 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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: Wall mounting (shearing) - behavior on slippery surfaces
MPL 3x3x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.10 kg / 0.22 LBS
102.0 g / 1.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 LBS
34.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.17 kg / 0.37 LBS
170.0 g / 1.7 N

Table 4: Steel thickness (saturation) - power losses
MPL 3x3x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.03 kg / 0.07 LBS
34.0 g / 0.3 N
1 mm
25%
0.09 kg / 0.19 LBS
85.0 g / 0.8 N
2 mm
50%
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
3 mm
75%
0.26 kg / 0.56 LBS
255.0 g / 2.5 N
5 mm
100%
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
10 mm
100%
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
11 mm
100%
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
12 mm
100%
0.34 kg / 0.75 LBS
340.0 g / 3.3 N

Table 5: Working in heat (stability) - resistance threshold
MPL 3x3x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.34 kg / 0.75 LBS
340.0 g / 3.3 N
OK
40 °C -2.2% 0.33 kg / 0.73 LBS
332.5 g / 3.3 N
OK
60 °C -4.4% 0.33 kg / 0.72 LBS
325.0 g / 3.2 N
OK
80 °C -6.6% 0.32 kg / 0.70 LBS
317.6 g / 3.1 N
100 °C -28.8% 0.24 kg / 0.53 LBS
242.1 g / 2.4 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 3x3x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.60 kg / 3.53 LBS
5 931 Gs
0.24 kg / 0.53 LBS
240 g / 2.4 N
N/A
1 mm 0.80 kg / 1.77 LBS
7 610 Gs
0.12 kg / 0.27 LBS
120 g / 1.2 N
0.72 kg / 1.59 LBS
~0 Gs
2 mm 0.36 kg / 0.78 LBS
5 061 Gs
0.05 kg / 0.12 LBS
53 g / 0.5 N
0.32 kg / 0.70 LBS
~0 Gs
3 mm 0.15 kg / 0.34 LBS
3 343 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
0.14 kg / 0.31 LBS
~0 Gs
5 mm 0.03 kg / 0.08 LBS
1 568 Gs
0.01 kg / 0.01 LBS
5 g / 0.1 N
0.03 kg / 0.07 LBS
~0 Gs
10 mm 0.00 kg / 0.00 LBS
384 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
70 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
6 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
3 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
2 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
1 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
1 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
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 3x3x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.5 cm
Hearing aid 10 Gs (1.0 mT) 2.0 cm
Mechanical watch 20 Gs (2.0 mT) 1.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.0 cm
Remote 50 Gs (5.0 mT) 1.0 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 3x3x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.19 km/h
(4.77 m/s)
0.00 J
30 mm 17.19 km/h
(4.78 m/s)
0.00 J
50 mm 17.19 km/h
(4.77 m/s)
0.00 J
100 mm 17.19 km/h
(4.78 m/s)
0.00 J

Table 9: Surface protection spec
MPL 3x3x3 / 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 3x3x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 495 Mx 5.0 µWb
Pc Coefficient 0.84 High (Stable)

Table 11: Submerged application
MPL 3x3x3 / N38

Environment Effective steel pull Effect
Air (land) 0.34 kg Standard
Water (riverbed) 0.39 kg
(+0.05 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84

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: 020148-2026
Magnet Unit Converter

Magnet pull force


Field Strength

Other proposals

Component MPL 3x3x3 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 0.34 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 3x3x3 / 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 3x3x3 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 0.34 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. 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 3x3x3 / 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. In practice, this means that this magnet has the greatest attraction force on its main planes (3x3 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 3 mm (length), 3 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 3x3x3 mm and a self-weight of 0.2 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Benefits

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By using a smooth layer of gold, the element presents an modern look,
  • Magnetic induction on the surface of the magnet remains maximum,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to freedom in constructing and the ability to adapt to complex applications,
  • Universal use in electronics industry – they find application in computer drives, motor assemblies, precision medical tools, and multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, assuming:
  • on a plate made of structural steel, effectively closing the magnetic flux
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

It is worth knowing that the working load may be lower influenced by the following factors, in order of importance:
  • Distance – existence of foreign body (rust, tape, 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 drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin steel does not accept the full field, causing part of the flux to be escaped to the other side.
  • Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.

Safe handling of neodymium magnets
Compass and GPS

A powerful magnetic field disrupts the functioning of compasses in phones and GPS navigation. Keep magnets close to a smartphone to avoid breaking the sensors.

Life threat

People with a pacemaker must maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Nickel coating and allergies

Certain individuals suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to dermatitis. It is best to wear safety gloves.

Danger to the youngest

Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Bone fractures

Mind your fingers. Two large magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Combustion hazard

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

Electronic hazard

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Caution required

Handle with care. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.

Maximum temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Fragile material

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Important! Learn more about hazards in the article: Magnet Safety Guide.