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MPL 3x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020147

GTIN/EAN: 5906301811534

5.00

length

3 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.13 g

Magnetization Direction

↑ axial

Load capacity

0.36 kg / 3.49 N

Magnetic Induction

472.94 mT / 4729 Gs

Coating

[NiCuNi] Nickel

see properties »

0.1722 ZŁ with VAT / pcs + price for transport

0.1400 ZŁ net + 23% VAT / pcs

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Technical of the product - MPL 3x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020147
GTIN/EAN 5906301811534
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 2 mm [±0,1 mm]
Weight 0.13 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.36 kg / 3.49 N
Magnetic Induction ~ ? 472.94 mT / 4729 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x2 / 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 product - report

The following values constitute the result of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 3x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4719 Gs
471.9 mT
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
 weak grip
1 mm 2223 Gs
222.3 mT
 0.08 kg / 0.18 pounds
79.9 g / 0.8 N
 weak grip
2 mm 966 Gs
96.6 mT
 0.02 kg / 0.03 pounds
15.1 g / 0.1 N
 weak grip
3 mm 468 Gs
46.8 mT
 0.00 kg / 0.01 pounds
3.5 g / 0.0 N
 weak grip
5 mm 153 Gs
15.3 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 weak grip
10 mm 26 Gs
2.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
15 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
20 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 0 Gs
0.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Grip strength weakens significantly per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, rust) significantly diminishes the holding power. Neodymiums work strongest at the point of direct contact; gap nullifies the force. Observe how rapidly the load capacity fall, when the magnet does not adhere tightly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Vertical load (wall)
MPL 3x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.16 pounds
72.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
2 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 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
The table below calculates the estimated shear load necessary to initiate the sliding of the magnet down along a vertical metal surface (considering typical friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 3x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.11 kg / 0.24 pounds
108.0 g / 1.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.16 pounds
72.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 0.08 pounds
36.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.40 pounds
180.0 g / 1.8 N
When placing a magnet on a upright surface (e.g., a car body), it will only hold just approx. 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that products slide down faster than they detach. Want to create a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a significantly smaller load. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 3x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
1 mm
25%
 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
2 mm
50%
 0.18 kg / 0.40 pounds
180.0 g / 1.8 N
3 mm
75%
 0.27 kg / 0.60 pounds
270.0 g / 2.6 N
5 mm
100%
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
10 mm
100%
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
11 mm
100%
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
12 mm
100%
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
A too thin steel is not enough to take in the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the field will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you require a sufficiently solid element of metal. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the product works worse. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (stability) - power drop
MPL 3x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
 OK
40 °C -2.2% 0.35 kg / 0.78 pounds
352.1 g / 3.5 N
 OK
60 °C -4.4% 0.34 kg / 0.76 pounds
344.2 g / 3.4 N
 OK
80 °C -6.6% 0.34 kg / 0.74 pounds
336.2 g / 3.3 N
100 °C -28.8% 0.26 kg / 0.57 pounds
256.3 g / 2.5 N
Classic neodymiums lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can permanently damage this product. As the temperature rises, the neodymium's force temporarily lowers. Avoid using this product close to heaters higher than its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than long magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MPL 3x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.24 kg / 2.72 pounds
5 677 Gs
0.19 kg / 0.41 pounds
185 g / 1.8 N
 N/A
1 mm 0.63 kg / 1.38 pounds
6 725 Gs
0.09 kg / 0.21 pounds
94 g / 0.9 N
 0.56 kg / 1.24 pounds
~0 Gs
2 mm 0.27 kg / 0.60 pounds
4 447 Gs
0.04 kg / 0.09 pounds
41 g / 0.4 N
 0.25 kg / 0.54 pounds
~0 Gs
3 mm 0.12 kg / 0.26 pounds
2 903 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
5 mm 0.02 kg / 0.05 pounds
1 324 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
10 mm 0.00 kg / 0.00 pounds
306 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
52 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 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
60 mm 0.00 kg / 0.00 pounds
2 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
2 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
1 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
1 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
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Calculations demonstrate sliding force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MPL 3x3x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.0 cm
Hearing aid 10 Gs (1.0 mT) 1.5 cm
Mechanical watch 20 Gs (2.0 mT) 1.5 cm
Mobile device 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
Extremely neodym field poses a serious hazard to electronics and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 3x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 53.07 km/h
(14.74 m/s)
 0.01 J
30 mm 91.92 km/h
(25.53 m/s)
 0.04 J
50 mm 118.67 km/h
(32.96 m/s)
 0.07 J
100 mm 167.83 km/h
(46.62 m/s)
 0.14 J
Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 3x3x2 / 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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 3x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 429 Mx 4.3 µWb
Pc Coefficient 0.66 High (Stable)
Flux value passing through the magnet pole. Key data when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 3x3x2 / N38

Environment Effective steel pull Effect
Air (land) 0.36 kg Standard
Water (riverbed) 0.41 kg
(+0.05 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.66

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: 020147-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 3x3x2 mm and a weight of 0.13 g, guarantees the highest quality connection. This magnetic block with a force of 3.49 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.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 0.36 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 3x3x2 / 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 hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 3x3x2 / N38, it is best to use 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 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 2 mm (thickness). The key parameter here is the holding force amounting to approximately 0.36 kg (force ~3.49 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Benefits

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They retain their magnetic properties even under close interference source,
  • In other words, due to the shiny surface of silver, the element is aesthetically pleasing,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to the option of accurate forming and customization to unique requirements, neodymium magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
  • Versatile presence in high-tech industry – they are utilized in magnetic memories, drive modules, precision medical tools, and industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a theoretical maximum value performed under the following configuration:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • characterized by smoothness
  • under conditions of no distance (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at standard ambient temperature

Magnet lifting force in use – key factors

Holding efficiency is influenced by specific conditions, such as (from most important):
  • Clearance – existence of foreign body (rust, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be wasted to the other side.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, 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 the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Heat warning

Do not overheat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Safe distance

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, medical aids, timepieces).

No play value

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or opt for coated magnets.

Bodily injuries

Big blocks can smash fingers instantly. Do not put your hand betwixt two strong magnets.

Protective goggles

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Dust explosion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Keep away from electronics

A strong magnetic field disrupts the operation of compasses in phones and navigation systems. Keep magnets close to a device to avoid damaging the sensors.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Do not underestimate power

Handle magnets consciously. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.

Security! Learn more about risks in the article: Magnet Safety Guide.