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Magnet fishing: solid F200/F400 sets

Start your adventure involving underwater treasure hunting! Our specialized grips (F200, F400) provide safety guarantee and immense power. Stainless steel construction and strong lines will perform in challenging water conditions.

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Reliable solutions for mounting non-invasive. Threaded grips (M8, M10, M12) guarantee quick improvement of work on production halls. Perfect for installing lighting, sensors and ads.

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MPL 30x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020138

GTIN/EAN: 5906301811442

5.00

length

30 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.25 g

Magnetization Direction

↑ axial

Load capacity

8.89 kg / 87.23 N

Magnetic Induction

329.52 mT / 3295 Gs

Coating

[NiCuNi] Nickel

4.26 with VAT / pcs + price for transport

3.46 ZŁ net + 23% VAT / pcs

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Technical details - MPL 30x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020138
GTIN/EAN 5906301811442
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 30 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.89 kg / 87.23 N
Magnetic Induction ~ ? 329.52 mT / 3295 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x10x5 / 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 modeling of the assembly - report

The following data represent the result of a physical calculation. Results are based on models for the material Nd2Fe14B. Real-world conditions may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MPL 30x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3294 Gs
329.4 mT
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
warning
1 mm 2866 Gs
286.6 mT
6.73 kg / 14.84 LBS
6731.1 g / 66.0 N
warning
2 mm 2424 Gs
242.4 mT
4.82 kg / 10.62 LBS
4816.4 g / 47.2 N
warning
3 mm 2022 Gs
202.2 mT
3.35 kg / 7.38 LBS
3349.6 g / 32.9 N
warning
5 mm 1397 Gs
139.7 mT
1.60 kg / 3.53 LBS
1600.3 g / 15.7 N
low risk
10 mm 615 Gs
61.5 mT
0.31 kg / 0.68 LBS
309.8 g / 3.0 N
low risk
15 mm 314 Gs
31.4 mT
0.08 kg / 0.18 LBS
80.6 g / 0.8 N
low risk
20 mm 177 Gs
17.7 mT
0.03 kg / 0.06 LBS
25.8 g / 0.3 N
low risk
30 mm 70 Gs
7.0 mT
0.00 kg / 0.01 LBS
4.1 g / 0.0 N
low risk
50 mm 19 Gs
1.9 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
low risk

Table 2: Slippage hold (wall)
MPL 30x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.78 kg / 3.92 LBS
1778.0 g / 17.4 N
1 mm Stal (~0.2) 1.35 kg / 2.97 LBS
1346.0 g / 13.2 N
2 mm Stal (~0.2) 0.96 kg / 2.13 LBS
964.0 g / 9.5 N
3 mm Stal (~0.2) 0.67 kg / 1.48 LBS
670.0 g / 6.6 N
5 mm Stal (~0.2) 0.32 kg / 0.71 LBS
320.0 g / 3.1 N
10 mm Stal (~0.2) 0.06 kg / 0.14 LBS
62.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 30x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.67 kg / 5.88 LBS
2667.0 g / 26.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.78 kg / 3.92 LBS
1778.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.96 LBS
889.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.45 kg / 9.80 LBS
4445.0 g / 43.6 N

Table 4: Steel thickness (saturation) - power losses
MPL 30x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.89 kg / 1.96 LBS
889.0 g / 8.7 N
1 mm
25%
2.22 kg / 4.90 LBS
2222.5 g / 21.8 N
2 mm
50%
4.45 kg / 9.80 LBS
4445.0 g / 43.6 N
3 mm
75%
6.67 kg / 14.70 LBS
6667.5 g / 65.4 N
5 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
10 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
11 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
12 mm
100%
8.89 kg / 19.60 LBS
8890.0 g / 87.2 N

Table 5: Thermal stability (material behavior) - resistance threshold
MPL 30x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.89 kg / 19.60 LBS
8890.0 g / 87.2 N
OK
40 °C -2.2% 8.69 kg / 19.17 LBS
8694.4 g / 85.3 N
OK
60 °C -4.4% 8.50 kg / 18.74 LBS
8498.8 g / 83.4 N
80 °C -6.6% 8.30 kg / 18.31 LBS
8303.3 g / 81.5 N
100 °C -28.8% 6.33 kg / 13.95 LBS
6329.7 g / 62.1 N

Table 6: Two magnets (repulsion) - field range
MPL 30x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.06 kg / 44.23 LBS
4 689 Gs
3.01 kg / 6.63 LBS
3010 g / 29.5 N
N/A
1 mm 17.63 kg / 38.86 LBS
6 174 Gs
2.64 kg / 5.83 LBS
2644 g / 25.9 N
15.86 kg / 34.98 LBS
~0 Gs
2 mm 15.19 kg / 33.49 LBS
5 732 Gs
2.28 kg / 5.02 LBS
2279 g / 22.4 N
13.67 kg / 30.14 LBS
~0 Gs
3 mm 12.92 kg / 28.47 LBS
5 285 Gs
1.94 kg / 4.27 LBS
1937 g / 19.0 N
11.62 kg / 25.63 LBS
~0 Gs
5 mm 9.08 kg / 20.03 LBS
4 432 Gs
1.36 kg / 3.00 LBS
1363 g / 13.4 N
8.18 kg / 18.02 LBS
~0 Gs
10 mm 3.61 kg / 7.96 LBS
2 795 Gs
0.54 kg / 1.19 LBS
542 g / 5.3 N
3.25 kg / 7.17 LBS
~0 Gs
20 mm 0.70 kg / 1.54 LBS
1 230 Gs
0.10 kg / 0.23 LBS
105 g / 1.0 N
0.63 kg / 1.39 LBS
~0 Gs
50 mm 0.02 kg / 0.05 LBS
217 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.04 LBS
~0 Gs
60 mm 0.01 kg / 0.02 LBS
141 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.01 LBS
96 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
68 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
50 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
38 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 30x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 30x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.96 km/h
(8.04 m/s)
0.36 J
30 mm 49.12 km/h
(13.64 m/s)
1.05 J
50 mm 63.39 km/h
(17.61 m/s)
1.74 J
100 mm 89.65 km/h
(24.90 m/s)
3.49 J

Table 9: Coating parameters (durability)
MPL 30x10x5 / 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 30x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 370 Mx 93.7 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 30x10x5 / N38

Environment Effective steel pull Effect
Air (land) 8.89 kg Standard
Water (riverbed) 10.18 kg
(+1.29 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 only a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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: 020138-2026
Measurement Calculator
Pulling force

Magnetic Field

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Component MPL 30x10x5 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 87.23 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects 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 8.89 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.
Plate magnets MPL 30x10x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. 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 30x10x5 / N38, we recommend utilizing 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. 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: 30 mm (length), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 30x10x5 mm and a self-weight of 11.25 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets are highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a shiny silver surface has better aesthetics,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of custom modeling and adapting to complex conditions,
  • Wide application in advanced technology sectors – they are commonly used in mass storage devices, electric motors, medical equipment, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Characteristics of disadvantages 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.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex forms in magnets, we propose using casing - magnetic mount.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Highest magnetic holding forcewhat it depends on?

Holding force of 8.89 kg is a theoretical maximum value conducted under specific, ideal conditions:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a thickness minimum 10 mm
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

In real-world applications, the actual holding force results from a number of factors, presented from crucial:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Life threat

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Permanent damage

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Keep away from computers

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Beware of splinters

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Choking Hazard

Neodymium magnets are not intended for children. Swallowing several magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Fire warning

Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, cease handling magnets and wear gloves.

Precision electronics

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Crushing risk

Protect your hands. Two powerful magnets will join immediately with a force of massive weight, destroying anything in their path. Be careful!

Respect the power

Handle magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their power.

Security! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98