Powerful neodymium magnets: discs and cylinders

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Magnet fishing: strong F200/F400 sets

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MPL 50x50x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020167

GTIN/EAN: 5906301811732

5.00

length

50 mm [±0,1 mm]

Width

50 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

187.5 g

Magnetization Direction

↑ axial

Load capacity

33.73 kg / 330.92 N

Magnetic Induction

209.75 mT / 2097 Gs

Coating

[NiCuNi] Nickel

42.88 with VAT / pcs + price for transport

34.86 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 50x50x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020167
GTIN/EAN 5906301811732
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 50 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 187.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 33.73 kg / 330.92 N
Magnetic Induction ~ ? 209.75 mT / 2097 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x10 / 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 assembly - report

The following values constitute the outcome of a engineering calculation. Values are based on algorithms for the class Nd2Fe14B. Actual performance may differ. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - interaction chart
MPL 50x50x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2097 Gs
209.7 mT
33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
critical level
1 mm 2056 Gs
205.6 mT
32.43 kg / 71.50 pounds
32430.0 g / 318.1 N
critical level
2 mm 2009 Gs
200.9 mT
30.96 kg / 68.27 pounds
30964.6 g / 303.8 N
critical level
3 mm 1957 Gs
195.7 mT
29.38 kg / 64.77 pounds
29380.4 g / 288.2 N
critical level
5 mm 1841 Gs
184.1 mT
25.99 kg / 57.30 pounds
25992.3 g / 255.0 N
critical level
10 mm 1514 Gs
151.4 mT
17.58 kg / 38.75 pounds
17577.6 g / 172.4 N
critical level
15 mm 1194 Gs
119.4 mT
10.93 kg / 24.10 pounds
10931.8 g / 107.2 N
critical level
20 mm 922 Gs
92.2 mT
6.51 kg / 14.36 pounds
6512.2 g / 63.9 N
strong
30 mm 543 Gs
54.3 mT
2.26 kg / 4.98 pounds
2260.0 g / 22.2 N
strong
50 mm 209 Gs
20.9 mT
0.33 kg / 0.74 pounds
334.1 g / 3.3 N
low risk

Table 2: Shear force (wall)
MPL 50x50x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
1 mm Stal (~0.2) 6.49 kg / 14.30 pounds
6486.0 g / 63.6 N
2 mm Stal (~0.2) 6.19 kg / 13.65 pounds
6192.0 g / 60.7 N
3 mm Stal (~0.2) 5.88 kg / 12.95 pounds
5876.0 g / 57.6 N
5 mm Stal (~0.2) 5.20 kg / 11.46 pounds
5198.0 g / 51.0 N
10 mm Stal (~0.2) 3.52 kg / 7.75 pounds
3516.0 g / 34.5 N
15 mm Stal (~0.2) 2.19 kg / 4.82 pounds
2186.0 g / 21.4 N
20 mm Stal (~0.2) 1.30 kg / 2.87 pounds
1302.0 g / 12.8 N
30 mm Stal (~0.2) 0.45 kg / 1.00 pounds
452.0 g / 4.4 N
50 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 50x50x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
10.12 kg / 22.31 pounds
10119.0 g / 99.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.37 kg / 7.44 pounds
3373.0 g / 33.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
16.87 kg / 37.18 pounds
16865.0 g / 165.4 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 50x50x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.69 kg / 3.72 pounds
1686.5 g / 16.5 N
1 mm
13%
4.22 kg / 9.30 pounds
4216.3 g / 41.4 N
2 mm
25%
8.43 kg / 18.59 pounds
8432.5 g / 82.7 N
3 mm
38%
12.65 kg / 27.89 pounds
12648.8 g / 124.1 N
5 mm
63%
21.08 kg / 46.48 pounds
21081.2 g / 206.8 N
10 mm
100%
33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
11 mm
100%
33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
12 mm
100%
33.73 kg / 74.36 pounds
33730.0 g / 330.9 N

Table 5: Thermal resistance (material behavior) - power drop
MPL 50x50x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
OK
40 °C -2.2% 32.99 kg / 72.73 pounds
32987.9 g / 323.6 N
OK
60 °C -4.4% 32.25 kg / 71.09 pounds
32245.9 g / 316.3 N
80 °C -6.6% 31.50 kg / 69.45 pounds
31503.8 g / 309.1 N
100 °C -28.8% 24.02 kg / 52.95 pounds
24015.8 g / 235.6 N

Table 6: Two magnets (attraction) - field collision
MPL 50x50x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 67.80 kg / 149.46 pounds
3 611 Gs
10.17 kg / 22.42 pounds
10169 g / 99.8 N
N/A
1 mm 66.54 kg / 146.70 pounds
4 156 Gs
9.98 kg / 22.01 pounds
9982 g / 97.9 N
59.89 kg / 132.03 pounds
~0 Gs
2 mm 65.18 kg / 143.70 pounds
4 113 Gs
9.78 kg / 21.56 pounds
9777 g / 95.9 N
58.66 kg / 129.33 pounds
~0 Gs
3 mm 63.74 kg / 140.53 pounds
4 067 Gs
9.56 kg / 21.08 pounds
9562 g / 93.8 N
57.37 kg / 126.48 pounds
~0 Gs
5 mm 60.67 kg / 133.75 pounds
3 968 Gs
9.10 kg / 20.06 pounds
9101 g / 89.3 N
54.60 kg / 120.38 pounds
~0 Gs
10 mm 52.24 kg / 115.18 pounds
3 682 Gs
7.84 kg / 17.28 pounds
7836 g / 76.9 N
47.02 kg / 103.66 pounds
~0 Gs
20 mm 35.33 kg / 77.89 pounds
3 028 Gs
5.30 kg / 11.68 pounds
5299 g / 52.0 N
31.80 kg / 70.10 pounds
~0 Gs
50 mm 7.69 kg / 16.96 pounds
1 413 Gs
1.15 kg / 2.54 pounds
1154 g / 11.3 N
6.92 kg / 15.26 pounds
~0 Gs
60 mm 4.54 kg / 10.01 pounds
1 086 Gs
0.68 kg / 1.50 pounds
681 g / 6.7 N
4.09 kg / 9.01 pounds
~0 Gs
70 mm 2.72 kg / 6.01 pounds
841 Gs
0.41 kg / 0.90 pounds
409 g / 4.0 N
2.45 kg / 5.41 pounds
~0 Gs
80 mm 1.67 kg / 3.68 pounds
658 Gs
0.25 kg / 0.55 pounds
250 g / 2.5 N
1.50 kg / 3.31 pounds
~0 Gs
90 mm 1.05 kg / 2.31 pounds
521 Gs
0.16 kg / 0.35 pounds
157 g / 1.5 N
0.94 kg / 2.08 pounds
~0 Gs
100 mm 0.67 kg / 1.48 pounds
417 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
0.60 kg / 1.33 pounds
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
MPL 50x50x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 21.0 cm
Hearing aid 10 Gs (1.0 mT) 16.5 cm
Mechanical watch 20 Gs (2.0 mT) 13.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.0 cm
Remote 50 Gs (5.0 mT) 9.5 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Dynamics (cracking risk) - warning
MPL 50x50x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.38 km/h
(4.83 m/s)
2.19 J
30 mm 24.39 km/h
(6.78 m/s)
4.30 J
50 mm 30.43 km/h
(8.45 m/s)
6.70 J
100 mm 42.78 km/h
(11.88 m/s)
13.24 J

Table 9: Corrosion resistance
MPL 50x50x10 / 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: Construction data (Flux)
MPL 50x50x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 61 501 Mx 615.0 µWb
Pc Coefficient 0.26 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 50x50x10 / N38

Environment Effective steel pull Effect
Air (land) 33.73 kg Standard
Water (riverbed) 38.62 kg
(+4.89 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains just a fraction of its max power.

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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.

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: 020167-2026
Measurement Calculator
Magnet pull force

Magnetic Field

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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 50x50x10 mm and a weight of 187.5 g, guarantees premium class connection. As a magnetic bar with high power (approx. 33.73 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is shifting 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 33.73 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 33.73 kg), they are ideal as hidden locks 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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.
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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 50 mm (width), and 10 mm (thickness). The key parameter here is the holding force amounting to approximately 33.73 kg (force ~330.92 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be highly resistant to demagnetization caused by external field sources,
  • In other words, due to the glossy surface of nickel, the element gains a professional look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to the potential of accurate shaping and adaptation to unique solutions, neodymium magnets can be manufactured in a variety of forms and dimensions, which increases their versatility,
  • Wide application in modern industrial fields – they find application in magnetic memories, motor assemblies, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we recommend 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 suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • using a plate made of mild steel, serving as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Holding efficiency is influenced by working environment parameters, such as (from most important):
  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Medical implants

Individuals with a pacemaker must maintain an safe separation from magnets. The magnetism can stop the functioning of the implant.

Precision electronics

Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Danger to the youngest

NdFeB magnets are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates immediate surgery.

Conscious usage

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

Allergy Warning

Studies show that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and select versions in plastic housing.

Permanent damage

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Threat to electronics

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Combustion hazard

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Fragile material

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them cracking into shards.

Bodily injuries

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Safety First! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98