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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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Technical of the product - 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

Physical analysis of the assembly - technical parameters

These data represent the outcome of a engineering calculation. Results are based on models for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static force (force 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
dangerous!
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
dangerous!
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
dangerous!
3 mm 1649 Gs
164.9 mT
8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
strong
5 mm 1395 Gs
139.5 mT
6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
strong
10 mm 870 Gs
87.0 mT
2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
strong
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: Shear force (wall)
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: Vertical assembly (sliding) - 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) - sheet metal selection
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 (material behavior) - power drop
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 (repulsion) - field range
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 (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 7.5 cm
Mobile device 40 Gs (4.0 mT) 6.0 cm
Car key 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: Physics of underwater searching
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. Shear force

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

2. Plate thickness effect

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

3. Thermal stability

*For N38 material, the critical 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.

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: 020473-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other deals

This product is a very powerful 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 magnetic 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. To separate the MPL 50x20x5 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
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 workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 50x20x5 / N38, we recommend utilizing 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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (50x20 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.
This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 12.69 kg (force ~124.48 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for nearly 10 years – the drop is just ~1% (based on simulations),
  • They maintain their magnetic properties even under strong external field,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in constructing and the ability to adapt to complex applications,
  • Key role in advanced technology sectors – they are used in hard drives, drive modules, precision medical tools, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • At 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.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:
  • on a plate made of mild steel, optimally conducting the magnetic field
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ground touching surface
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in real conditions – factors

During everyday use, the actual holding force results from a number of factors, listed from the most important:
  • Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
GPS and phone interference

Be aware: neodymium magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Pacemakers

For implant holders: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Thermal limits

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

Fire warning

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Do not bring magnets near a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Caution required

Exercise caution. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Pinching danger

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

Fragile material

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.

Choking Hazard

Neodymium magnets are not toys. Swallowing a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.

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