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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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Strength as well as appearance of a magnet can be calculated with our magnetic mass calculator.

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Technical of the product - 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

Technical simulation of the magnet - technical parameters

The following values are the outcome of a physical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull 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
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: Shear hold (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 (sliding) - 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) - 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 (stability) - 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: Two magnets (attraction) - field collision
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) - 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
Car key 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 (cracking risk) - 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 (Pc)
MPL 3x3x1 / N38

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

Table 11: Physics of underwater searching
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. Wall mount (shear)

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

2. Steel saturation

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

3. Heat tolerance

*For N38 grade, the max working temp is 80°C.

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

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

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
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%
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
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Pulling force

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Component MPL 3x3x1 / N38 features a flat shape 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. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 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 3x3x1 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 0.23 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.
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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease 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. 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.
This model is characterized by dimensions 3x3x1 mm, which, at a weight of 0.07 g, makes it an element with impressive 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.

Strengths and weaknesses of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external field influence,
  • Thanks to the shiny finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the capacity to adapt to client solutions,
  • Fundamental importance in advanced technology sectors – they find application in magnetic memories, electromotive mechanisms, medical equipment, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend 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, in case of application outdoors
  • Due to limitations in realizing nuts and complicated shapes in magnets, we propose using a housing - magnetic mount.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Magnet power was determined for optimal configuration, including:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • with total lack of distance (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

In practice, the actual holding force is determined by many variables, ranked from crucial:
  • Air gap (betwixt the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Finger safety

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Compass and GPS

Note: neodymium magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.

ICD Warning

Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Cards and drives

Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Protective goggles

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets leads to them breaking into shards.

Nickel coating and allergies

A percentage of the population have a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.

Thermal limits

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Product not for children

Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep away from kids and pets.

Do not underestimate power

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

Fire warning

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Danger! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98