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MPL 3x3x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020148

GTIN/EAN: 5906301811541

5.00

length

3 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.2 g

Magnetization Direction

↑ axial

Load capacity

0.34 kg / 3.37 N

Magnetic Induction

538.48 mT / 5385 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 3x3x3 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020148
GTIN/EAN 5906301811541
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 3 mm [±0,1 mm]
Weight 0.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.34 kg / 3.37 N
Magnetic Induction ~ ? 538.48 mT / 5385 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x3 / 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 modeling of the product - technical parameters

Presented data are the result of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 3x3x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5372 Gs
537.2 mT
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
weak grip
1 mm 2530 Gs
253.0 mT
0.08 kg / 0.17 pounds
75.4 g / 0.7 N
weak grip
2 mm 1127 Gs
112.7 mT
0.01 kg / 0.03 pounds
15.0 g / 0.1 N
weak grip
3 mm 562 Gs
56.2 mT
0.00 kg / 0.01 pounds
3.7 g / 0.0 N
weak grip
5 mm 192 Gs
19.2 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
weak grip
10 mm 35 Gs
3.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
15 mm 12 Gs
1.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
20 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
30 mm 2 Gs
0.2 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

Table 2: Sliding hold (vertical surface)
MPL 3x3x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.15 pounds
68.0 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 / 0.00 pounds
2.0 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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 3x3x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.10 kg / 0.22 pounds
102.0 g / 1.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.17 kg / 0.37 pounds
170.0 g / 1.7 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 3x3x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
1 mm
25%
0.09 kg / 0.19 pounds
85.0 g / 0.8 N
2 mm
50%
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
3 mm
75%
0.26 kg / 0.56 pounds
255.0 g / 2.5 N
5 mm
100%
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
10 mm
100%
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
11 mm
100%
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
12 mm
100%
0.34 kg / 0.75 pounds
340.0 g / 3.3 N

Table 5: Thermal resistance (material behavior) - power drop
MPL 3x3x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.34 kg / 0.75 pounds
340.0 g / 3.3 N
OK
40 °C -2.2% 0.33 kg / 0.73 pounds
332.5 g / 3.3 N
OK
60 °C -4.4% 0.33 kg / 0.72 pounds
325.0 g / 3.2 N
OK
80 °C -6.6% 0.32 kg / 0.70 pounds
317.6 g / 3.1 N
100 °C -28.8% 0.24 kg / 0.53 pounds
242.1 g / 2.4 N

Table 6: Two magnets (attraction) - field range
MPL 3x3x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.60 kg / 3.53 pounds
5 931 Gs
0.24 kg / 0.53 pounds
240 g / 2.4 N
N/A
1 mm 0.80 kg / 1.77 pounds
7 610 Gs
0.12 kg / 0.27 pounds
120 g / 1.2 N
0.72 kg / 1.59 pounds
~0 Gs
2 mm 0.36 kg / 0.78 pounds
5 061 Gs
0.05 kg / 0.12 pounds
53 g / 0.5 N
0.32 kg / 0.70 pounds
~0 Gs
3 mm 0.15 kg / 0.34 pounds
3 343 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
0.14 kg / 0.31 pounds
~0 Gs
5 mm 0.03 kg / 0.08 pounds
1 568 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
0.03 kg / 0.07 pounds
~0 Gs
10 mm 0.00 kg / 0.00 pounds
384 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
70 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
6 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
3 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

Table 7: Protective zones (electronics) - warnings
MPL 3x3x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.5 cm
Hearing aid 10 Gs (1.0 mT) 2.0 cm
Mechanical watch 20 Gs (2.0 mT) 1.5 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 (cracking risk) - collision effects
MPL 3x3x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 41.58 km/h
(11.55 m/s)
0.01 J
30 mm 72.02 km/h
(20.01 m/s)
0.04 J
50 mm 92.98 km/h
(25.83 m/s)
0.07 J
100 mm 131.49 km/h
(36.53 m/s)
0.13 J

Table 9: Surface protection spec
MPL 3x3x3 / 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 3x3x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 495 Mx 5.0 µWb
Pc Coefficient 0.84 High (Stable)

Table 11: Underwater work (magnet fishing)
MPL 3x3x3 / N38

Environment Effective steel pull Effect
Air (land) 0.34 kg Standard
Water (riverbed) 0.39 kg
(+0.05 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

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.84

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 specification and ecology
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%
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: 020148-2026
Magnet Unit Converter
Pulling force

Magnetic Field

Other deals

Component MPL 3x3x3 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 3.37 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures 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 3x3x3 / 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.
They constitute a key element in the production of wind generators and material handling systems. 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 3x3x3 / 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 3x3x3 / N38 model is magnetized axially (dimension 3 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.
The presented product is a neodymium magnet with precisely defined parameters: 3 mm (length), 3 mm (width), and 3 mm (thickness). It is a magnetic block with dimensions 3x3x3 mm and a self-weight of 0.2 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Benefits

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • Their strength is durable, and after around ten years it drops only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • A magnet with a metallic silver surface is more attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the potential of flexible molding and adaptation to individualized needs, magnetic components can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
  • Key role in modern technologies – they serve a role in data components, brushless drives, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 stable to moisture, when using outdoors
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, small components of these products are able to complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat affects it?

The declared magnet strength represents the limit force, recorded under optimal environment, specifically:
  • using a base made of low-carbon steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity impacted by specific conditions, including (from most important):
  • Distance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

H&S for magnets
Finger safety

Large magnets can crush fingers in a fraction of a second. Do not place your hand between two strong magnets.

Mechanical processing

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Demagnetization risk

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Allergic reactions

A percentage of the population experience a sensitization to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause an allergic reaction. We suggest wear safety gloves.

GPS Danger

A powerful magnetic field disrupts the functioning of compasses in phones and navigation systems. Maintain magnets near a smartphone to prevent breaking the sensors.

Threat to electronics

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Powerful field

Be careful. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Shattering risk

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

This is not a toy

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.

Medical interference

For implant holders: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Security! More info about risks in the article: Magnet Safety Guide.