Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

MPL 50x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020166

GTIN/EAN: 5906301811725

5.00
Load capacity 42.18 kg / 413.81 N Magnetic Induction 478.99 mT / 4790 Gs
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
150 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

38.47net / pcs

47.32 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?

Quantity
Net
Gross
price from 1 pcs
38.47 zł
47.32 zł
price from 20 pcs
36.16 zł
44.48 zł
price from 70 pcs
33.85 zł
41.64 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Technical data of the product - MPL 50x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020166
GTIN/EAN 5906301811725
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 50 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 150 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.18 kg / 413.81 N
Magnetic Induction ~ ? 478.99 mT / 4790 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x20 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 magnet - technical parameters

These data constitute the outcome of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MPL 50x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4789 Gs
478.9 mT
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
critical level
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
critical level
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
critical level
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
critical level
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
critical level
10 mm 2022 Gs
202.2 mT
7.52 kg / 16.59 LBS
7522.9 g / 73.8 N
medium risk
15 mm 1324 Gs
132.4 mT
3.22 kg / 7.10 LBS
3222.6 g / 31.6 N
medium risk
20 mm 899 Gs
89.9 mT
1.49 kg / 3.28 LBS
1487.5 g / 14.6 N
low risk
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
low risk
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
low risk

Table 2: Vertical force (wall)
MPL 50x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
1 mm Stal (~0.2) 7.29 kg / 16.08 LBS
7292.0 g / 71.5 N
2 mm Stal (~0.2) 6.23 kg / 13.73 LBS
6226.0 g / 61.1 N
3 mm Stal (~0.2) 5.27 kg / 11.61 LBS
5268.0 g / 51.7 N
5 mm Stal (~0.2) 3.70 kg / 8.17 LBS
3704.0 g / 36.3 N
10 mm Stal (~0.2) 1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
15 mm Stal (~0.2) 0.64 kg / 1.42 LBS
644.0 g / 6.3 N
20 mm Stal (~0.2) 0.30 kg / 0.66 LBS
298.0 g / 2.9 N
30 mm Stal (~0.2) 0.08 kg / 0.17 LBS
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N

Table 3: Vertical assembly (sliding) - vertical pull
MPL 50x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.65 kg / 27.90 LBS
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 LBS
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 LBS
21090.0 g / 206.9 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.11 kg / 4.65 LBS
2109.0 g / 20.7 N
1 mm
13%
5.27 kg / 11.62 LBS
5272.5 g / 51.7 N
2 mm
25%
10.55 kg / 23.25 LBS
10545.0 g / 103.4 N
3 mm
38%
15.82 kg / 34.87 LBS
15817.5 g / 155.2 N
5 mm
63%
26.36 kg / 58.12 LBS
26362.5 g / 258.6 N
10 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
11 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
12 mm
100%
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N

Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
OK
40 °C -2.2% 41.25 kg / 90.95 LBS
41252.0 g / 404.7 N
OK
60 °C -4.4% 40.32 kg / 88.90 LBS
40324.1 g / 395.6 N
OK
80 °C -6.6% 39.40 kg / 86.85 LBS
39396.1 g / 386.5 N
100 °C -28.8% 30.03 kg / 66.21 LBS
30032.2 g / 294.6 N

Table 6: Two magnets (attraction) - field range
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 141.37 kg / 311.66 LBS
5 687 Gs
21.21 kg / 46.75 LBS
21205 g / 208.0 N
N/A
1 mm 131.73 kg / 290.41 LBS
9 245 Gs
19.76 kg / 43.56 LBS
19759 g / 193.8 N
118.55 kg / 261.37 LBS
~0 Gs
2 mm 122.20 kg / 269.41 LBS
8 904 Gs
18.33 kg / 40.41 LBS
18330 g / 179.8 N
109.98 kg / 242.47 LBS
~0 Gs
3 mm 113.05 kg / 249.23 LBS
8 564 Gs
16.96 kg / 37.38 LBS
16957 g / 166.4 N
101.74 kg / 224.31 LBS
~0 Gs
5 mm 96.05 kg / 211.76 LBS
7 894 Gs
14.41 kg / 31.76 LBS
14408 g / 141.3 N
86.45 kg / 190.58 LBS
~0 Gs
10 mm 62.08 kg / 136.87 LBS
6 347 Gs
9.31 kg / 20.53 LBS
9312 g / 91.4 N
55.87 kg / 123.18 LBS
~0 Gs
20 mm 25.21 kg / 55.59 LBS
4 045 Gs
3.78 kg / 8.34 LBS
3782 g / 37.1 N
22.69 kg / 50.03 LBS
~0 Gs
50 mm 2.46 kg / 5.43 LBS
1 264 Gs
0.37 kg / 0.81 LBS
370 g / 3.6 N
2.22 kg / 4.89 LBS
~0 Gs
60 mm 1.29 kg / 2.85 LBS
916 Gs
0.19 kg / 0.43 LBS
194 g / 1.9 N
1.16 kg / 2.57 LBS
~0 Gs
70 mm 0.71 kg / 1.58 LBS
681 Gs
0.11 kg / 0.24 LBS
107 g / 1.1 N
0.64 kg / 1.42 LBS
~0 Gs
80 mm 0.41 kg / 0.91 LBS
518 Gs
0.06 kg / 0.14 LBS
62 g / 0.6 N
0.37 kg / 0.82 LBS
~0 Gs
90 mm 0.25 kg / 0.55 LBS
402 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
0.22 kg / 0.49 LBS
~0 Gs
100 mm 0.16 kg / 0.34 LBS
318 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
0.14 kg / 0.31 LBS
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 50x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Timepiece 20 Gs (2.0 mT) 11.5 cm
Mobile device 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Dynamics (kinetic energy) - warning
MPL 50x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.74 km/h
(5.21 m/s)
2.03 J
30 mm 20.65 km/h
(5.74 m/s)
2.47 J
50 mm 20.78 km/h
(5.77 m/s)
2.50 J
100 mm 20.80 km/h
(5.78 m/s)
2.50 J

Table 9: Corrosion resistance
MPL 50x20x20 / 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 (Pc)
MPL 50x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 46 654 Mx 466.5 µWb
Pc Coefficient 0.63 High (Stable)

Table 11: Hydrostatics and buoyancy
MPL 50x20x20 / N38

Environment Effective steel pull Effect
Air (land) 42.18 kg Standard
Water (riverbed) 48.30 kg
(+6.12 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Sliding resistance

*Warning: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63

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

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%

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: 020166-2026
Magnet Unit Converter

Force (pull)


Field Strength

Check out more offers

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 42.18 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.
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 42.18 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x20x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x20x20 / 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).
Standardly, the MPL 50x20x20 / N38 model is magnetized through the thickness (dimension 20 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 (50x20 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: 50 mm (length), 20 mm (width), and 20 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 42.18 kg (force ~413.81 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Magnets possess huge magnetic induction on the active area,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in shaping and the ability to adapt to client solutions,
  • Huge importance in electronics industry – they are commonly used in data components, electric motors, medical equipment, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Cons

What to avoid - cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend 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 resistant to moisture, in case of application outdoors
  • We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Breakaway force was determined for optimal configuration, including:
  • using a plate made of low-carbon steel, acting as a circuit closing element
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Key elements affecting lifting force

Bear in mind that the working load will differ depending on the following factors, in order of importance:
  • Clearance – the presence of foreign body (paint, dirt, air) acts as an insulator, which lowers power steeply (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 nominal force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Bodily injuries

Large magnets can crush fingers instantly. Do not put your hand between two attracting surfaces.

Powerful field

Use magnets consciously. Their immense force can surprise even professionals. Plan your moves and respect their power.

Fire risk

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

Electronic hazard

Avoid bringing magnets near a wallet, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Choking Hazard

Absolutely keep magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.

Do not overheat magnets

Avoid heat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Phone sensors

Navigation devices and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.

Attention! Want to know more? Read our article: Why are neodymium magnets dangerous?