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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

Physical simulation of the product - technical parameters

Presented data represent the result of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Treat these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - 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
warning
1 mm 3323 Gs
332.3 mT
2.34 kg / 5.17 lbs
2344.7 g / 23.0 N
warning
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: Shear 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) - sheet metal selection
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) - power drop
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) Shear 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: Safety (HSE) (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
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 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: Dynamics (cracking risk) - 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: Corrosion resistance
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 (Flux)
MPL 20x5x5 / N38

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

Table 11: Submerged application
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely ~20% of its max power.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

*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) = 0.54

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 specification and ecology
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: 020132-2026
Quick Unit Converter
Pulling force

Magnetic Induction

Other offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x5x5 mm and a weight of 3.75 g, guarantees premium class connection. This magnetic block with a force of 43.32 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x5x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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 20x5x5 / 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. 4.42 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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. 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).
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. 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. The key parameter here is the holding force amounting to approximately 4.42 kg (force ~43.32 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for almost 10 years – the loss is just ~1% (according to analyses),
  • Magnets effectively resist against demagnetization caused by ambient magnetic noise,
  • Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in designing and the capacity to adapt to client solutions,
  • Huge importance in modern industrial fields – they are used in HDD drives, drive modules, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

Holding force of 4.42 kg is a result of laboratory testing executed under standard conditions:
  • on a block made of mild steel, effectively closing the magnetic field
  • whose thickness is min. 10 mm
  • with a plane perfectly flat
  • with direct contact (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower influenced by the following factors, in order of importance:
  • Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Steel thickness – too thin steel does not accept the full field, causing part of the flux to be lost into the air.
  • Plate material – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Caution required

Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and respect their force.

Adults only

These products are not suitable for play. Eating several magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Threat to navigation

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Bodily injuries

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying anything in their path. Be careful!

Beware of splinters

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them cracking into shards.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Allergy Warning

Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for encased magnets.

Danger to pacemakers

People with a heart stimulator must keep an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Electronic hazard

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

Do not drill into magnets

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Caution! Learn more about hazards in the article: Magnet Safety Guide.