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MPL 20x5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020132

GTIN/EAN: 5906301811381

5.00

length

20 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

3.75 g

Magnetization Direction

↑ axial

Load capacity

4.42 kg / 43.32 N

Magnetic Induction

456.78 mT / 4568 Gs

Coating

[NiCuNi] Nickel

2.76 with VAT / pcs + price for transport

2.24 ZŁ net + 23% VAT / pcs

bulk discounts:

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Product card - MPL 20x5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 20x5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020132
GTIN/EAN 5906301811381
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 20 mm [±0,1 mm]
Width 5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 3.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.42 kg / 43.32 N
Magnetic Induction ~ ? 456.78 mT / 4568 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x5x5 / 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 analysis of the magnet - technical parameters

Presented values represent the result of a physical calculation. Results are based on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - characteristics
MPL 20x5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4563 Gs
456.3 mT
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
strong
1 mm 3323 Gs
332.3 mT
2.34 kg / 5.17 lbs
2344.7 g / 23.0 N
strong
2 mm 2341 Gs
234.1 mT
1.16 kg / 2.56 lbs
1163.0 g / 11.4 N
weak grip
3 mm 1678 Gs
167.8 mT
0.60 kg / 1.32 lbs
597.4 g / 5.9 N
weak grip
5 mm 944 Gs
94.4 mT
0.19 kg / 0.42 lbs
189.2 g / 1.9 N
weak grip
10 mm 320 Gs
32.0 mT
0.02 kg / 0.05 lbs
21.7 g / 0.2 N
weak grip
15 mm 141 Gs
14.1 mT
0.00 kg / 0.01 lbs
4.2 g / 0.0 N
weak grip
20 mm 73 Gs
7.3 mT
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
weak grip
30 mm 26 Gs
2.6 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
weak grip
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Vertical force (vertical surface)
MPL 20x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.88 kg / 1.95 lbs
884.0 g / 8.7 N
1 mm Stal (~0.2) 0.47 kg / 1.03 lbs
468.0 g / 4.6 N
2 mm Stal (~0.2) 0.23 kg / 0.51 lbs
232.0 g / 2.3 N
3 mm Stal (~0.2) 0.12 kg / 0.26 lbs
120.0 g / 1.2 N
5 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
10 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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 20x5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.33 kg / 2.92 lbs
1326.0 g / 13.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.88 kg / 1.95 lbs
884.0 g / 8.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.44 kg / 0.97 lbs
442.0 g / 4.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.21 kg / 4.87 lbs
2210.0 g / 21.7 N

Table 4: Material efficiency (saturation) - power losses
MPL 20x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.44 kg / 0.97 lbs
442.0 g / 4.3 N
1 mm
25%
1.11 kg / 2.44 lbs
1105.0 g / 10.8 N
2 mm
50%
2.21 kg / 4.87 lbs
2210.0 g / 21.7 N
3 mm
75%
3.32 kg / 7.31 lbs
3315.0 g / 32.5 N
5 mm
100%
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
10 mm
100%
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
11 mm
100%
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
12 mm
100%
4.42 kg / 9.74 lbs
4420.0 g / 43.4 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.42 kg / 9.74 lbs
4420.0 g / 43.4 N
OK
40 °C -2.2% 4.32 kg / 9.53 lbs
4322.8 g / 42.4 N
OK
60 °C -4.4% 4.23 kg / 9.32 lbs
4225.5 g / 41.5 N
80 °C -6.6% 4.13 kg / 9.10 lbs
4128.3 g / 40.5 N
100 °C -28.8% 3.15 kg / 6.94 lbs
3147.0 g / 30.9 N

Table 6: Two magnets (attraction) - field collision
MPL 20x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.84 kg / 28.30 lbs
5 504 Gs
1.93 kg / 4.24 lbs
1925 g / 18.9 N
N/A
1 mm 9.53 kg / 21.01 lbs
7 864 Gs
1.43 kg / 3.15 lbs
1430 g / 14.0 N
8.58 kg / 18.91 lbs
~0 Gs
2 mm 6.81 kg / 15.01 lbs
6 647 Gs
1.02 kg / 2.25 lbs
1021 g / 10.0 N
6.13 kg / 13.51 lbs
~0 Gs
3 mm 4.79 kg / 10.57 lbs
5 577 Gs
0.72 kg / 1.59 lbs
719 g / 7.1 N
4.31 kg / 9.51 lbs
~0 Gs
5 mm 2.40 kg / 5.30 lbs
3 949 Gs
0.36 kg / 0.79 lbs
360 g / 3.5 N
2.16 kg / 4.77 lbs
~0 Gs
10 mm 0.55 kg / 1.21 lbs
1 888 Gs
0.08 kg / 0.18 lbs
82 g / 0.8 N
0.49 kg / 1.09 lbs
~0 Gs
20 mm 0.06 kg / 0.14 lbs
640 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
0.06 kg / 0.13 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
84 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
53 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
35 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
24 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
18 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
13 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 20x5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MPL 20x5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.73 km/h
(9.65 m/s)
0.17 J
30 mm 59.97 km/h
(16.66 m/s)
0.52 J
50 mm 77.42 km/h
(21.51 m/s)
0.87 J
100 mm 109.49 km/h
(30.41 m/s)
1.73 J

Table 9: Surface protection spec
MPL 20x5x5 / 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 20x5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 204 Mx 42.0 µWb
Pc Coefficient 0.54 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 20x5x5 / N38

Environment Effective steel pull Effect
Air (land) 4.42 kg Standard
Water (riverbed) 5.06 kg
(+0.64 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Caution: On a vertical wall, the magnet retains only approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

*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) = 0.54

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
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: 020132-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

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Model MPL 20x5x5 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 4.42 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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. Watch your fingers! Magnets with a force of 4.42 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 20x5x5 / 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 20x5x5 / N38, it is best to use strong epoxy glues (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 (20x5 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 20x5x5 mm, which, at a weight of 3.75 g, makes it an element with high energy density. It is a magnetic block with dimensions 20x5x5 mm and a self-weight of 3.75 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They maintain their magnetic properties even under strong external field,
  • A magnet with a smooth silver surface looks better,
  • Magnets are characterized by maximum magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the capacity to customize to unusual requirements,
  • Huge importance in advanced technology sectors – they are used in HDD drives, electric motors, advanced medical instruments, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnetwhat contributes to it?

Holding force of 4.42 kg is a theoretical maximum value conducted under the following configuration:
  • on a base made of structural steel, effectively closing the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by smoothness
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Bear in mind that the application force will differ subject to elements below, in order of importance:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Health Danger

For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

No play value

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

Caution required

Handle magnets with awareness. Their immense force can shock even professionals. Stay alert and respect their force.

Electronic hazard

Data protection: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Allergy Warning

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for coated magnets.

Keep away from electronics

Note: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Fire risk

Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Operating temperature

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Finger safety

Large magnets can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Beware of splinters

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

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