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MPL 20x8x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020133

GTIN/EAN: 5906301811398

5.00

length

20 mm [±0,1 mm]

Width

8 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

4.8 g

Magnetization Direction

↑ axial

Load capacity

4.79 kg / 46.98 N

Magnetic Induction

336.99 mT / 3370 Gs

Coating

[NiCuNi] Nickel

3.67 with VAT / pcs + price for transport

2.98 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 20x8x4 / N38 - lamellar magnet

Specification / characteristics - MPL 20x8x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020133
GTIN/EAN 5906301811398
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 8 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 4.8 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.79 kg / 46.98 N
Magnetic Induction ~ ? 336.99 mT / 3370 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x8x4 / 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 - data

Presented information constitute the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MPL 20x8x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3368 Gs
336.8 mT
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
warning
1 mm 2818 Gs
281.8 mT
3.35 kg / 7.39 lbs
3352.3 g / 32.9 N
warning
2 mm 2266 Gs
226.6 mT
2.17 kg / 4.78 lbs
2167.6 g / 21.3 N
warning
3 mm 1794 Gs
179.4 mT
1.36 kg / 3.00 lbs
1358.6 g / 13.3 N
safe
5 mm 1130 Gs
113.0 mT
0.54 kg / 1.19 lbs
538.9 g / 5.3 N
safe
10 mm 416 Gs
41.6 mT
0.07 kg / 0.16 lbs
73.0 g / 0.7 N
safe
15 mm 187 Gs
18.7 mT
0.01 kg / 0.03 lbs
14.7 g / 0.1 N
safe
20 mm 97 Gs
9.7 mT
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
safe
30 mm 35 Gs
3.5 mT
0.00 kg / 0.00 lbs
0.5 g / 0.0 N
safe
50 mm 9 Gs
0.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Sliding hold (vertical surface)
MPL 20x8x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.96 kg / 2.11 lbs
958.0 g / 9.4 N
1 mm Stal (~0.2) 0.67 kg / 1.48 lbs
670.0 g / 6.6 N
2 mm Stal (~0.2) 0.43 kg / 0.96 lbs
434.0 g / 4.3 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
272.0 g / 2.7 N
5 mm Stal (~0.2) 0.11 kg / 0.24 lbs
108.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 lbs
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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) - vertical pull
MPL 20x8x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.44 kg / 3.17 lbs
1437.0 g / 14.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.96 kg / 2.11 lbs
958.0 g / 9.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.06 lbs
479.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.40 kg / 5.28 lbs
2395.0 g / 23.5 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x8x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.48 kg / 1.06 lbs
479.0 g / 4.7 N
1 mm
25%
1.20 kg / 2.64 lbs
1197.5 g / 11.7 N
2 mm
50%
2.40 kg / 5.28 lbs
2395.0 g / 23.5 N
3 mm
75%
3.59 kg / 7.92 lbs
3592.5 g / 35.2 N
5 mm
100%
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
10 mm
100%
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
11 mm
100%
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
12 mm
100%
4.79 kg / 10.56 lbs
4790.0 g / 47.0 N

Table 5: Thermal stability (stability) - power drop
MPL 20x8x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.79 kg / 10.56 lbs
4790.0 g / 47.0 N
OK
40 °C -2.2% 4.68 kg / 10.33 lbs
4684.6 g / 46.0 N
OK
60 °C -4.4% 4.58 kg / 10.10 lbs
4579.2 g / 44.9 N
80 °C -6.6% 4.47 kg / 9.86 lbs
4473.9 g / 43.9 N
100 °C -28.8% 3.41 kg / 7.52 lbs
3410.5 g / 33.5 N

Table 6: Two magnets (attraction) - field range
MPL 20x8x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.19 kg / 24.67 lbs
4 784 Gs
1.68 kg / 3.70 lbs
1678 g / 16.5 N
N/A
1 mm 9.49 kg / 20.93 lbs
6 205 Gs
1.42 kg / 3.14 lbs
1424 g / 14.0 N
8.54 kg / 18.84 lbs
~0 Gs
2 mm 7.83 kg / 17.26 lbs
5 635 Gs
1.17 kg / 2.59 lbs
1175 g / 11.5 N
7.05 kg / 15.54 lbs
~0 Gs
3 mm 6.34 kg / 13.97 lbs
5 069 Gs
0.95 kg / 2.10 lbs
951 g / 9.3 N
5.70 kg / 12.57 lbs
~0 Gs
5 mm 4.02 kg / 8.85 lbs
4 035 Gs
0.60 kg / 1.33 lbs
602 g / 5.9 N
3.61 kg / 7.97 lbs
~0 Gs
10 mm 1.26 kg / 2.78 lbs
2 259 Gs
0.19 kg / 0.42 lbs
189 g / 1.9 N
1.13 kg / 2.50 lbs
~0 Gs
20 mm 0.17 kg / 0.38 lbs
832 Gs
0.03 kg / 0.06 lbs
26 g / 0.3 N
0.15 kg / 0.34 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
112 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
70 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
46 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
32 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
23 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
17 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 20x8x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 20x8x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 32.16 km/h
(8.93 m/s)
0.19 J
30 mm 55.18 km/h
(15.33 m/s)
0.56 J
50 mm 71.24 km/h
(19.79 m/s)
0.94 J
100 mm 100.75 km/h
(27.99 m/s)
1.88 J

Table 9: Anti-corrosion coating durability
MPL 20x8x4 / 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: Electrical data (Flux)
MPL 20x8x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 277 Mx 52.8 µWb
Pc Coefficient 0.38 Low (Flat)

Table 11: Submerged application
MPL 20x8x4 / N38

Environment Effective steel pull Effect
Air (land) 4.79 kg Standard
Water (riverbed) 5.48 kg
(+0.69 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!
1. Vertical hold

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

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

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
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%
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: 020133-2026
Quick Unit Converter
Pulling force

Magnetic Field

Other offers

Model MPL 20x8x4 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 4.79 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 4.79 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 4.79 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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 20x8x4 / 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 20x8x4 / N38 model is magnetized through the thickness (dimension 4 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 (20x8 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: 20 mm (length), 8 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 20x8x4 mm and a self-weight of 4.8 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.

Benefits

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • Their power is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • Neodymium magnets remain extremely resistant to demagnetization caused by magnetic disturbances,
  • By covering with a shiny coating of nickel, the element has an professional look,
  • Magnets are characterized by extremely high magnetic induction on the working surface,
  • 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 modularity in forming and the ability to adapt to specific needs,
  • Key role in future technologies – they serve a role in mass storage devices, electric drive systems, medical equipment, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's 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.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a thickness minimum 10 mm
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular force direction (90-degree angle)
  • in stable room temperature

Lifting capacity in real conditions – factors

Real force impacted by working environment parameters, such as (from priority):
  • Distance (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Serious injuries

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Danger to the youngest

Absolutely keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.

Handling guide

Handle with care. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose encased magnets.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Keep away from computers

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

Health Danger

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Eye protection

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Flammability

Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Keep away from electronics

Note: rare earth magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Security! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98