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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

bulk discounts:

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Parameters and structure of neodymium magnets can be checked on our magnetic mass calculator.

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Detailed specification - 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

Technical analysis of the assembly - technical parameters

Presented information constitute the direct effect of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - 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
crushing
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
crushing
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
crushing
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
safe
20 mm 359 Gs
35.9 mT
0.42 kg / 0.92 LBS
418.9 g / 4.1 N
safe
30 mm 172 Gs
17.2 mT
0.10 kg / 0.21 LBS
95.7 g / 0.9 N
safe
50 mm 54 Gs
5.4 mT
0.01 kg / 0.02 LBS
9.5 g / 0.1 N
safe

Table 2: Vertical 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 (substrate influence) - 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) - resistance threshold
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: Two magnets (repulsion) - forces in the system
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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: Protective zones (implants) - warnings
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
Phone / Smartphone 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 (cracking risk) - 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: Corrosion resistance
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: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly reduces 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) = 0.21

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.

Engineering data and GPSR
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%
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
Measurement Calculator
Pulling force

Magnetic Induction

View also products

Model MPL 50x20x5 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 12.69 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.
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. To separate the MPL 50x20x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x20x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 12.69 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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 roughen and wash 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. 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 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around 10 years it decreases only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • In other words, due to the shiny layer of gold, the element becomes visually attractive,
  • Magnets have exceptionally strong magnetic induction on the surface,
  • 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...
  • Considering the possibility of flexible molding and customization to custom solutions, magnetic components can be created in a broad palette of geometric configurations, which amplifies use scope,
  • Wide application in innovative solutions – they are utilized in mass storage devices, motor assemblies, medical equipment, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • on a block made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an ground contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity depends on a number of factors, presented from the most important:
  • Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Allergy Warning

Studies show that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for coated magnets.

Combustion hazard

Dust generated during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Crushing risk

Danger of trauma: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Medical interference

People with a ICD must maintain an large gap from magnets. The magnetism can stop the operation of the implant.

Phone sensors

A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent damaging the sensors.

No play value

Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are very dangerous.

Electronic hazard

Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Maximum temperature

Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Risk of cracking

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Handling rules

Handle with care. Rare earth magnets act from a distance and snap with huge force, often quicker than you can react.

Attention! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98