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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

technical parameters »

0.1722 ZŁ with VAT / pcs + price for transport

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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

Engineering analysis of the product - report

These information are the direct effect of a engineering simulation. Results are based on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - 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 lbs
360.0 g / 3.5 N
 low risk
1 mm 2223 Gs
222.3 mT
 0.08 kg / 0.18 lbs
79.9 g / 0.8 N
 low risk
2 mm 966 Gs
96.6 mT
 0.02 kg / 0.03 lbs
15.1 g / 0.1 N
 low risk
3 mm 468 Gs
46.8 mT
 0.00 kg / 0.01 lbs
3.5 g / 0.0 N
 low risk
5 mm 153 Gs
15.3 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 low risk
10 mm 26 Gs
2.6 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
15 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
20 mm 4 Gs
0.4 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
Grip strength decreases sharply with every subsequent millimeter of distance. Remember that even a microscopic distance (e.g., contamination, varnish, dust) strongly diminishes the holding power. Magnetic products hold strongest at the point of direct contact; gap nullifies the force. See how rapidly the load capacity plummet, when the product does not adhere flatly to the metal substrate. When calculating the assembly, avoid additional spacers.

Table 2: Slippage 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 lbs
72.0 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 / 0.01 lbs
4.0 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
The table below defines the estimated weight limit needed to start the downward movement of the magnet downwards along a vertical metal surface (considering typical friction). This parameter depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 lbs
108.0 g / 1.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.16 lbs
72.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 0.08 lbs
36.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.40 lbs
180.0 g / 1.8 N
When mounting a element on a vertical surface (e.g., a car body), it will only hold barely about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that products move down easier than they detach. Want to create a vertical fastening? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter cargo. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 3x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
1 mm
25%
 0.09 kg / 0.20 lbs
90.0 g / 0.9 N
2 mm
50%
 0.18 kg / 0.40 lbs
180.0 g / 1.8 N
3 mm
75%
 0.27 kg / 0.60 lbs
270.0 g / 2.6 N
5 mm
100%
 0.36 kg / 0.79 lbs
360.0 g / 3.5 N
10 mm
100%
 0.36 kg / 0.79 lbs
360.0 g / 3.5 N
11 mm
100%
 0.36 kg / 0.79 lbs
360.0 g / 3.5 N
12 mm
100%
 0.36 kg / 0.79 lbs
360.0 g / 3.5 N
A thin metal plate is incapable of focus the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 3x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.36 kg / 0.79 lbs
360.0 g / 3.5 N
 OK
40 °C -2.2% 0.35 kg / 0.78 lbs
352.1 g / 3.5 N
 OK
60 °C -4.4% 0.34 kg / 0.76 lbs
344.2 g / 3.4 N
 OK
80 °C -6.6% 0.34 kg / 0.74 lbs
336.2 g / 3.3 N
100 °C -28.8% 0.26 kg / 0.57 lbs
256.3 g / 2.5 N
Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Avoid high temperatures – high temperature can permanently demagnetize this product. As the temperature rises, the magnet's power briefly decreases. Refrain from using this magnet near heat sources exceeding its working range. Too high temperature will lead to permanent loss of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.24 kg / 2.72 lbs
5 677 Gs
0.19 kg / 0.41 lbs
185 g / 1.8 N
 N/A
1 mm 0.63 kg / 1.38 lbs
6 725 Gs
0.09 kg / 0.21 lbs
94 g / 0.9 N
 0.56 kg / 1.24 lbs
~0 Gs
2 mm 0.27 kg / 0.60 lbs
4 447 Gs
0.04 kg / 0.09 lbs
41 g / 0.4 N
 0.25 kg / 0.54 lbs
~0 Gs
3 mm 0.12 kg / 0.26 lbs
2 903 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.23 lbs
~0 Gs
5 mm 0.02 kg / 0.05 lbs
1 324 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
10 mm 0.00 kg / 0.00 lbs
306 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
52 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
4 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
2 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
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Estimates show friction force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
Timepiece 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 electronic devices and pacemakers. These neodymiums generate a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
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 very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or injury to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when working with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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 pole surface. Essential parameter for generator designers and motors. Pc value defines the magnet's operating point.

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely limits 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.

Engineering data and GPSR
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%
Environmental data
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
Quick Unit Converter
Force (pull)
Magnetic Induction
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Model MPL 3x3x2 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 3.49 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 workshop organization 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.
Standardly, the MPL 3x3x2 / N38 model is magnetized axially (dimension 2 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.
This model is characterized by dimensions 3x3x2 mm, which, at a weight of 0.13 g, makes it an element with high energy density. The key parameter here is the lifting capacity 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.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
  • In other words, due to the aesthetic surface of gold, the element is aesthetically pleasing,
  • Magnetic induction on the working layer of the magnet turns out to be very high,
  • 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...
  • Possibility of accurate machining as well as adjusting to individual requirements,
  • Huge importance in high-tech industry – they find application in computer drives, drive modules, diagnostic systems, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complex forms in magnets, we propose using a housing - magnetic mechanism.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Highest magnetic holding force – what affects it?

The specified lifting capacity refers to the limit force, measured under optimal environment, specifically:
  • using a plate made of mild steel, acting as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with a surface free of scratches
  • with zero gap (without impurities)
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Please note that the magnet holding may be lower depending on elements below, starting with the most relevant:
  • Air gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Fire risk

Dust generated during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Thermal limits

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Pacemakers

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.

Magnetic interference

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Protective goggles

Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

No play value

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep out of reach of children and animals.

Hand protection

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Nickel allergy

Medical facts indicate that nickel (the usual finish) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands and opt for encased magnets.

Magnetic media

Do not bring magnets close to a purse, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Important! Learn more about risks in the article: Safety of working with magnets.