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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN/EAN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

Coating

[NiCuNi] Nickel

14.56 with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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Product card - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020473
GTIN/EAN 5906301811930
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 5 mm [±0,1 mm]
Weight 37.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 simulation of the magnet - report

Presented values constitute the direct effect of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Actual performance may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
critical level
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 lbs
11530.3 g / 113.1 N
critical level
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 lbs
10199.9 g / 100.1 N
critical level
3 mm 1649 Gs
164.9 mT
8.83 kg / 19.47 lbs
8831.3 g / 86.6 N
warning
5 mm 1395 Gs
139.5 mT
6.32 kg / 13.93 lbs
6320.3 g / 62.0 N
warning
10 mm 870 Gs
87.0 mT
2.46 kg / 5.42 lbs
2459.4 g / 24.1 N
warning
15 mm 549 Gs
54.9 mT
0.98 kg / 2.15 lbs
976.9 g / 9.6 N
low risk
20 mm 359 Gs
35.9 mT
0.42 kg / 0.92 lbs
418.9 g / 4.1 N
low risk
30 mm 172 Gs
17.2 mT
0.10 kg / 0.21 lbs
95.7 g / 0.9 N
low risk
50 mm 54 Gs
5.4 mT
0.01 kg / 0.02 lbs
9.5 g / 0.1 N
low risk

Table 2: Shear load (vertical surface)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 lbs
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 lbs
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 lbs
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 lbs
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 lbs
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 lbs
6345.0 g / 62.2 N

Table 4: Steel thickness (saturation) - power losses
MPL 50x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.63 kg / 1.40 lbs
634.5 g / 6.2 N
1 mm
13%
1.59 kg / 3.50 lbs
1586.3 g / 15.6 N
2 mm
25%
3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
3 mm
38%
4.76 kg / 10.49 lbs
4758.8 g / 46.7 N
5 mm
63%
7.93 kg / 17.49 lbs
7931.2 g / 77.8 N
10 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
11 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
12 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N

Table 5: Thermal stability (stability) - thermal limit
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
OK
40 °C -2.2% 12.41 kg / 27.36 lbs
12410.8 g / 121.8 N
OK
60 °C -4.4% 12.13 kg / 26.75 lbs
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 lbs
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 lbs
9035.3 g / 88.6 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 lbs
3 371 Gs
3.61 kg / 7.97 lbs
3614 g / 35.5 N
N/A
1 mm 23.06 kg / 50.84 lbs
3 868 Gs
3.46 kg / 7.63 lbs
3459 g / 33.9 N
20.75 kg / 45.75 lbs
~0 Gs
2 mm 21.89 kg / 48.27 lbs
3 769 Gs
3.28 kg / 7.24 lbs
3284 g / 32.2 N
19.71 kg / 43.44 lbs
~0 Gs
3 mm 20.65 kg / 45.53 lbs
3 661 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
18.59 kg / 40.98 lbs
~0 Gs
5 mm 18.07 kg / 39.83 lbs
3 424 Gs
2.71 kg / 5.97 lbs
2710 g / 26.6 N
16.26 kg / 35.84 lbs
~0 Gs
10 mm 12.00 kg / 26.46 lbs
2 790 Gs
1.80 kg / 3.97 lbs
1800 g / 17.7 N
10.80 kg / 23.81 lbs
~0 Gs
20 mm 4.67 kg / 10.30 lbs
1 741 Gs
0.70 kg / 1.54 lbs
701 g / 6.9 N
4.20 kg / 9.27 lbs
~0 Gs
50 mm 0.37 kg / 0.81 lbs
488 Gs
0.06 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.73 lbs
~0 Gs
60 mm 0.18 kg / 0.40 lbs
343 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
0.16 kg / 0.36 lbs
~0 Gs
70 mm 0.10 kg / 0.21 lbs
248 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
0.09 kg / 0.19 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
184 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
140 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
108 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs

Table 7: Hazards (implants) - precautionary measures
MPL 50x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Remote 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.68 km/h
(5.74 m/s)
0.62 J
30 mm 32.28 km/h
(8.97 m/s)
1.51 J
50 mm 41.50 km/h
(11.53 m/s)
2.49 J
100 mm 58.67 km/h
(16.30 m/s)
4.98 J

Table 9: Surface protection spec
MPL 50x20x5 / 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 50x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 50x20x5 / N38

Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.21

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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%
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: 020473-2026
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Magnet pull force

Magnetic Induction

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x5 mm and a weight of 37.5 g, guarantees the highest quality connection. This rectangular block with a force of 124.48 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects 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. Watch your fingers! Magnets with a force of 12.69 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 12.69 kg), they are ideal as closers 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (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 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 12.69 kg (force ~124.48 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Pros

Apart from their consistent power, neodymium magnets have these key benefits:
  • They do not lose power, even after nearly ten years – the reduction in power is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external field influence,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • 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 modify to unusual requirements,
  • Universal use in high-tech industry – they are used in mass storage devices, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat it depends on?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Magnet lifting force in use – key factors

Please note that the magnet holding may be lower subject to elements below, starting with the most relevant:
  • Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Protective goggles

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Crushing force

Danger of trauma: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Do not drill into magnets

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Nickel allergy

Certain individuals experience a sensitization to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to a rash. We recommend wear safety gloves.

Electronic devices

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Adults only

Adult use only. Tiny parts can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

GPS Danger

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Conscious usage

Handle with care. Neodymium magnets act from a long distance and snap with huge force, often quicker than you can move away.

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Danger to pacemakers

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?