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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

bulk discounts:

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Technical - 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

Engineering analysis of the product - technical parameters

These data are the outcome of a engineering calculation. Results were calculated on models for the class Nd2Fe14B. Actual parameters might slightly differ. Treat these data as a reference point for designers.

Table 1: Static force (force vs gap) - interaction chart
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
low risk
1 mm 1565 Gs
156.5 mT
0.06 kg / 0.12 LBS
56.1 g / 0.6 N
low risk
2 mm 659 Gs
65.9 mT
0.01 kg / 0.02 LBS
9.9 g / 0.1 N
low risk
3 mm 307 Gs
30.7 mT
0.00 kg / 0.00 LBS
2.2 g / 0.0 N
low risk
5 mm 94 Gs
9.4 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
low risk
10 mm 15 Gs
1.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
15 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
20 mm 2 Gs
0.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Slippage load (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: Wall mounting (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: Material efficiency (substrate influence) - sheet metal selection
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) - power drop
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 (repulsion) - field collision
MPL 3x3x1 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: Protective zones (implants) - precautionary measures
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: Impact energy (kinetic energy) - collision effects
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: Electrical data (Flux)
MPL 3x3x1 / N38

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

Table 11: Submerged application
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%
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. Vertical hold

*Caution: On a vertical wall, the magnet holds only a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.

3. Heat tolerance

*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) = 0.40

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.

Engineering data and GPSR
Elemental analysis
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: 020146-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

View also offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 3x3x1 mm and a weight of 0.07 g, guarantees the highest quality connection. This rectangular block with a force of 2.29 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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. 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 3x3x1 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts 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 3x3x1 / N38, we recommend utilizing two-component adhesives (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).
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.
This model is characterized by dimensions 3x3x1 mm, which, at a weight of 0.07 g, makes it an element with high energy density. It is a magnetic block with dimensions 3x3x1 mm and a self-weight of 0.07 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Pros

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They retain full power for almost ten years – the drop is just ~1% (in theory),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • By covering with a smooth coating of silver, the element gains an professional look,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in constructing and the capacity to modify to unusual requirements,
  • Fundamental importance in modern industrial fields – they find application in data components, drive modules, advanced medical instruments, also multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of producing nuts in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The load parameter shown refers to the limit force, measured under laboratory conditions, meaning:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • with a thickness minimum 10 mm
  • characterized by lack of roughness
  • with total lack of distance (no coatings)
  • during pulling in a direction vertical to the plane
  • in stable room temperature

Practical lifting capacity: influencing factors

Holding efficiency impacted by specific conditions, such as (from most important):
  • Gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted to the other side.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Medical interference

Patients with a ICD must keep an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.

Caution required

Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Allergic reactions

Some people suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to dermatitis. We recommend wear protective gloves.

This is not a toy

Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

GPS Danger

Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Cards and drives

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Magnet fragility

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Pinching danger

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Maximum temperature

Watch the temperature. Heating the magnet to high heat will destroy its properties and pulling force.

Dust explosion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98