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MPL 3x3x1 / N38 - lamellar magnet

lamellar magnet

Catalog no 020146

GTIN/EAN: 5906301811527

5.00

length

3 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

1 mm [±0,1 mm]

Weight

0.07 g

Magnetization Direction

↑ axial

Load capacity

0.23 kg / 2.29 N

Magnetic Induction

317.31 mT / 3173 Gs

Coating

[NiCuNi] Nickel

0.1845 with VAT / pcs + price for transport

0.1500 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 3x3x1 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x1 / N38 - lamellar magnet

properties
properties values
Cat. no. 020146
GTIN/EAN 5906301811527
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 1 mm [±0,1 mm]
Weight 0.07 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.23 kg / 2.29 N
Magnetic Induction ~ ? 317.31 mT / 3173 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x1 / 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 assembly - report

Presented data are the direct effect of a physical calculation. Values were calculated on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 3x3x1 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3168 Gs
316.8 mT
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
safe
1 mm 1565 Gs
156.5 mT
0.06 kg / 0.12 lbs
56.1 g / 0.6 N
safe
2 mm 659 Gs
65.9 mT
0.01 kg / 0.02 lbs
9.9 g / 0.1 N
safe
3 mm 307 Gs
30.7 mT
0.00 kg / 0.00 lbs
2.2 g / 0.0 N
safe
5 mm 94 Gs
9.4 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
safe
10 mm 15 Gs
1.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
15 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
20 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Slippage force (wall)
MPL 3x3x1 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
1 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 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: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 3x3x1 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.07 kg / 0.15 lbs
69.0 g / 0.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.02 kg / 0.05 lbs
23.0 g / 0.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.12 kg / 0.25 lbs
115.0 g / 1.1 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 3x3x1 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.02 kg / 0.05 lbs
23.0 g / 0.2 N
1 mm
25%
0.06 kg / 0.13 lbs
57.5 g / 0.6 N
2 mm
50%
0.12 kg / 0.25 lbs
115.0 g / 1.1 N
3 mm
75%
0.17 kg / 0.38 lbs
172.5 g / 1.7 N
5 mm
100%
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
10 mm
100%
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
11 mm
100%
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
12 mm
100%
0.23 kg / 0.51 lbs
230.0 g / 2.3 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 3x3x1 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.23 kg / 0.51 lbs
230.0 g / 2.3 N
OK
40 °C -2.2% 0.22 kg / 0.50 lbs
224.9 g / 2.2 N
OK
60 °C -4.4% 0.22 kg / 0.48 lbs
219.9 g / 2.2 N
80 °C -6.6% 0.21 kg / 0.47 lbs
214.8 g / 2.1 N
100 °C -28.8% 0.16 kg / 0.36 lbs
163.8 g / 1.6 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 3x3x1 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.56 kg / 1.23 lbs
4 719 Gs
0.08 kg / 0.18 lbs
84 g / 0.8 N
N/A
1 mm 0.31 kg / 0.68 lbs
4 706 Gs
0.05 kg / 0.10 lbs
46 g / 0.5 N
0.28 kg / 0.61 lbs
~0 Gs
2 mm 0.14 kg / 0.30 lbs
3 129 Gs
0.02 kg / 0.04 lbs
20 g / 0.2 N
0.12 kg / 0.27 lbs
~0 Gs
3 mm 0.06 kg / 0.12 lbs
2 019 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.11 lbs
~0 Gs
5 mm 0.01 kg / 0.02 lbs
885 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
0.01 kg / 0.02 lbs
~0 Gs
10 mm 0.00 kg / 0.00 lbs
188 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
30 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
2 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
1 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
1 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
0 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
0 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 3x3x1 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 1.5 cm
Hearing aid 10 Gs (1.0 mT) 1.5 cm
Timepiece 20 Gs (2.0 mT) 1.0 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) - warning
MPL 3x3x1 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 57.81 km/h
(16.06 m/s)
0.01 J
30 mm 100.13 km/h
(27.81 m/s)
0.03 J
50 mm 129.27 km/h
(35.91 m/s)
0.05 J
100 mm 182.81 km/h
(50.78 m/s)
0.09 J

Table 9: Corrosion resistance
MPL 3x3x1 / 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 3x3x1 / N38

Parameter Value SI Unit / Description
Magnetic Flux 306 Mx 3.1 µWb
Pc Coefficient 0.40 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 3x3x1 / N38

Environment Effective steel pull Effect
Air (land) 0.23 kg Standard
Water (riverbed) 0.26 kg
(+0.03 kg buoyancy gain)
+14.5%
Warning: 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

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40

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
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: 020146-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other proposals

Model MPL 3x3x1 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 2.29 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 3x3x1 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 3x3x1 / 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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (3x3 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: 3 mm (length), 3 mm (width), and 1 mm (thickness). The key parameter here is the holding force amounting to approximately 0.23 kg (force ~2.29 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for nearly ten years – the drop is just ~1% (according to analyses),
  • Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of custom machining and optimizing to complex requirements,
  • Wide application in innovative solutions – they are used in computer drives, electromotive mechanisms, medical devices, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The load parameter shown refers to the limit force, obtained under laboratory conditions, namely:
  • with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a thickness of at least 10 mm
  • with a surface cleaned and smooth
  • without any clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity depends on several key aspects, presented from the most important:
  • Clearance – the presence of any layer (rust, tape, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Do not overheat magnets

Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

Magnets are brittle

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

Handling rules

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often faster than you can react.

Adults only

Absolutely store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Fire risk

Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Safe distance

Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Crushing risk

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Magnetic interference

A strong magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a smartphone to prevent breaking the sensors.

Health Danger

People with a ICD must keep an safe separation from magnets. The magnetic field can interfere with the operation of the implant.

Warning for allergy sufferers

Medical facts indicate that nickel (the usual finish) is a potent allergen. If you have an allergy, refrain from direct skin contact or select coated magnets.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?