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MPL 50x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020165

GTIN/EAN: 5906301811718

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

75 g

Magnetization Direction

↑ axial

Load capacity

29.99 kg / 294.15 N

Magnetic Induction

337.18 mT / 3372 Gs

Coating

[NiCuNi] Nickel

43.05 with VAT / pcs + price for transport

35.00 ZŁ net + 23% VAT / pcs

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Technical - MPL 50x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020165
GTIN/EAN 5906301811718
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 10 mm [±0,1 mm]
Weight 75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 29.99 kg / 294.15 N
Magnetic Induction ~ ? 337.18 mT / 3372 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x10 / 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 - data

The following values represent the outcome of a physical analysis. Values rely on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
MPL 50x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3371 Gs
337.1 mT
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
crushing
1 mm 3158 Gs
315.8 mT
26.32 kg / 58.03 LBS
26323.3 g / 258.2 N
crushing
2 mm 2932 Gs
293.2 mT
22.69 kg / 50.02 LBS
22687.6 g / 222.6 N
crushing
3 mm 2703 Gs
270.3 mT
19.29 kg / 42.52 LBS
19286.7 g / 189.2 N
crushing
5 mm 2266 Gs
226.6 mT
13.55 kg / 29.86 LBS
13546.3 g / 132.9 N
crushing
10 mm 1419 Gs
141.9 mT
5.31 kg / 11.71 LBS
5313.0 g / 52.1 N
warning
15 mm 908 Gs
90.8 mT
2.17 kg / 4.79 LBS
2174.5 g / 21.3 N
warning
20 mm 603 Gs
60.3 mT
0.96 kg / 2.12 LBS
961.0 g / 9.4 N
safe
30 mm 296 Gs
29.6 mT
0.23 kg / 0.51 LBS
231.0 g / 2.3 N
safe
50 mm 97 Gs
9.7 mT
0.02 kg / 0.05 LBS
24.8 g / 0.2 N
safe

Table 2: Slippage force (vertical surface)
MPL 50x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
1 mm Stal (~0.2) 5.26 kg / 11.61 LBS
5264.0 g / 51.6 N
2 mm Stal (~0.2) 4.54 kg / 10.00 LBS
4538.0 g / 44.5 N
3 mm Stal (~0.2) 3.86 kg / 8.51 LBS
3858.0 g / 37.8 N
5 mm Stal (~0.2) 2.71 kg / 5.97 LBS
2710.0 g / 26.6 N
10 mm Stal (~0.2) 1.06 kg / 2.34 LBS
1062.0 g / 10.4 N
15 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
20 mm Stal (~0.2) 0.19 kg / 0.42 LBS
192.0 g / 1.9 N
30 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
9.00 kg / 19.83 LBS
8997.0 g / 88.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.00 kg / 6.61 LBS
2999.0 g / 29.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
15.00 kg / 33.06 LBS
14995.0 g / 147.1 N

Table 4: Steel thickness (saturation) - power losses
MPL 50x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.50 kg / 3.31 LBS
1499.5 g / 14.7 N
1 mm
13%
3.75 kg / 8.26 LBS
3748.8 g / 36.8 N
2 mm
25%
7.50 kg / 16.53 LBS
7497.5 g / 73.6 N
3 mm
38%
11.25 kg / 24.79 LBS
11246.3 g / 110.3 N
5 mm
63%
18.74 kg / 41.32 LBS
18743.8 g / 183.9 N
10 mm
100%
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
11 mm
100%
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
12 mm
100%
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N

Table 5: Thermal resistance (stability) - resistance threshold
MPL 50x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
OK
40 °C -2.2% 29.33 kg / 64.66 LBS
29330.2 g / 287.7 N
OK
60 °C -4.4% 28.67 kg / 63.21 LBS
28670.4 g / 281.3 N
80 °C -6.6% 28.01 kg / 61.75 LBS
28010.7 g / 274.8 N
100 °C -28.8% 21.35 kg / 47.07 LBS
21352.9 g / 209.5 N

Table 6: Two magnets (attraction) - field collision
MPL 50x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 70.06 kg / 154.45 LBS
4 789 Gs
10.51 kg / 23.17 LBS
10509 g / 103.1 N
N/A
1 mm 65.83 kg / 145.13 LBS
6 535 Gs
9.87 kg / 21.77 LBS
9874 g / 96.9 N
59.25 kg / 130.61 LBS
~0 Gs
2 mm 61.49 kg / 135.57 LBS
6 316 Gs
9.22 kg / 20.34 LBS
9224 g / 90.5 N
55.34 kg / 122.01 LBS
~0 Gs
3 mm 57.20 kg / 126.10 LBS
6 092 Gs
8.58 kg / 18.92 LBS
8580 g / 84.2 N
51.48 kg / 113.49 LBS
~0 Gs
5 mm 48.94 kg / 107.89 LBS
5 635 Gs
7.34 kg / 16.18 LBS
7341 g / 72.0 N
44.05 kg / 97.10 LBS
~0 Gs
10 mm 31.64 kg / 69.76 LBS
4 531 Gs
4.75 kg / 10.46 LBS
4747 g / 46.6 N
28.48 kg / 62.79 LBS
~0 Gs
20 mm 12.41 kg / 27.36 LBS
2 838 Gs
1.86 kg / 4.10 LBS
1862 g / 18.3 N
11.17 kg / 24.63 LBS
~0 Gs
50 mm 1.07 kg / 2.35 LBS
832 Gs
0.16 kg / 0.35 LBS
160 g / 1.6 N
0.96 kg / 2.12 LBS
~0 Gs
60 mm 0.54 kg / 1.19 LBS
592 Gs
0.08 kg / 0.18 LBS
81 g / 0.8 N
0.49 kg / 1.07 LBS
~0 Gs
70 mm 0.29 kg / 0.64 LBS
433 Gs
0.04 kg / 0.10 LBS
43 g / 0.4 N
0.26 kg / 0.57 LBS
~0 Gs
80 mm 0.16 kg / 0.36 LBS
324 Gs
0.02 kg / 0.05 LBS
24 g / 0.2 N
0.15 kg / 0.32 LBS
~0 Gs
90 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
100 mm 0.06 kg / 0.13 LBS
194 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
0.05 kg / 0.11 LBS
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MPL 50x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.0 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 50x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.29 km/h
(6.19 m/s)
1.44 J
30 mm 35.10 km/h
(9.75 m/s)
3.56 J
50 mm 45.12 km/h
(12.53 m/s)
5.89 J
100 mm 63.77 km/h
(17.72 m/s)
11.77 J

Table 9: Coating parameters (durability)
MPL 50x20x10 / 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 50x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 32 980 Mx 329.8 µWb
Pc Coefficient 0.38 Low (Flat)

Table 11: Physics of underwater searching
MPL 50x20x10 / N38

Environment Effective steel pull Effect
Air (land) 29.99 kg Standard
Water (riverbed) 34.34 kg
(+4.35 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. Vertical hold

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.38

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
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: 020165-2026
Quick Unit Converter
Magnet pull force

Magnetic Field

Other proposals

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x20x10 mm and a weight of 75 g, guarantees premium class connection. As a magnetic bar with high power (approx. 29.99 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. Watch your fingers! Magnets with a force of 29.99 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. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x20x10 / N38, it is best to use two-component adhesives (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. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x20x10 mm, which, at a weight of 75 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x10 mm and a self-weight of 75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their strength is durable, and after approximately 10 years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under strong external field,
  • In other words, due to the reflective layer of gold, the element looks attractive,
  • Magnets exhibit excellent magnetic induction on the working surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of accurate modeling as well as adapting to specific applications,
  • Significant place in modern technologies – they are utilized in magnetic memories, brushless drives, advanced medical instruments, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat it depends on?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:
  • on a block made of mild steel, optimally conducting the magnetic field
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • with direct contact (without paint)
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Holding efficiency is affected by specific conditions, such as (from most important):
  • Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings
Hand protection

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

Caution required

Be careful. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Risk of cracking

Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Maximum temperature

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Medical implants

Patients with a heart stimulator must keep an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.

Threat to electronics

Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands or choose versions in plastic housing.

Keep away from children

Neodymium magnets are not intended for children. Eating multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Keep away from electronics

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent damaging the sensors.

Machining danger

Dust produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Important! More info about risks in the article: Safety of working with magnets.