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Grips for seabed exploration

Start your adventure involving underwater treasure hunting! Our double-handle grips (F200, F400) provide safety guarantee and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes will perform in rivers and lakes.

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Reliable solutions for mounting non-invasive. Threaded mounts (M8, M10, M12) guarantee quick improvement of work on warehouses. Perfect for installing lamps, detectors and ads.

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MPL 200x30x30 / N38 - lamellar magnet

lamellar magnet

Catalog no 020125

GTIN/EAN: 5906301811312

5.00

length

200 mm [±0,1 mm]

Width

30 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

1350 g

Magnetization Direction

↑ axial

Load capacity

287.38 kg / 2819.19 N

Magnetic Induction

445.15 mT / 4451 Gs

Coating

[NiCuNi] Nickel

563.28 with VAT / pcs + price for transport

457.95 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical details - MPL 200x30x30 / N38 - lamellar magnet

Specification / characteristics - MPL 200x30x30 / N38 - lamellar magnet

properties
properties values
Cat. no. 020125
GTIN/EAN 5906301811312
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 200 mm [±0,1 mm]
Width 30 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 1350 g
Magnetization Direction ↑ axial
Load capacity ~ ? 287.38 kg / 2819.19 N
Magnetic Induction ~ ? 445.15 mT / 4451 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 200x30x30 / 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 simulation of the product - technical parameters

Presented values constitute the direct effect of a mathematical calculation. Values are based on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 200x30x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4451 Gs
445.1 mT
287.38 kg / 633.56 lbs
287380.0 g / 2819.2 N
dangerous!
1 mm 4241 Gs
424.1 mT
260.91 kg / 575.21 lbs
260910.0 g / 2559.5 N
dangerous!
2 mm 4028 Gs
402.8 mT
235.43 kg / 519.04 lbs
235433.0 g / 2309.6 N
dangerous!
3 mm 3818 Gs
381.8 mT
211.49 kg / 466.26 lbs
211490.2 g / 2074.7 N
dangerous!
5 mm 3412 Gs
341.2 mT
168.87 kg / 372.30 lbs
168870.4 g / 1656.6 N
dangerous!
10 mm 2539 Gs
253.9 mT
93.54 kg / 206.22 lbs
93539.2 g / 917.6 N
dangerous!
15 mm 1902 Gs
190.2 mT
52.48 kg / 115.70 lbs
52481.2 g / 514.8 N
dangerous!
20 mm 1457 Gs
145.7 mT
30.79 kg / 67.88 lbs
30789.8 g / 302.0 N
dangerous!
30 mm 920 Gs
92.0 mT
12.29 kg / 27.09 lbs
12288.2 g / 120.5 N
dangerous!
50 mm 456 Gs
45.6 mT
3.02 kg / 6.65 lbs
3016.4 g / 29.6 N
strong

Table 2: Sliding hold (wall)
MPL 200x30x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 57.48 kg / 126.71 lbs
57476.0 g / 563.8 N
1 mm Stal (~0.2) 52.18 kg / 115.04 lbs
52182.0 g / 511.9 N
2 mm Stal (~0.2) 47.09 kg / 103.81 lbs
47086.0 g / 461.9 N
3 mm Stal (~0.2) 42.30 kg / 93.25 lbs
42298.0 g / 414.9 N
5 mm Stal (~0.2) 33.77 kg / 74.46 lbs
33774.0 g / 331.3 N
10 mm Stal (~0.2) 18.71 kg / 41.24 lbs
18708.0 g / 183.5 N
15 mm Stal (~0.2) 10.50 kg / 23.14 lbs
10496.0 g / 103.0 N
20 mm Stal (~0.2) 6.16 kg / 13.58 lbs
6158.0 g / 60.4 N
30 mm Stal (~0.2) 2.46 kg / 5.42 lbs
2458.0 g / 24.1 N
50 mm Stal (~0.2) 0.60 kg / 1.33 lbs
604.0 g / 5.9 N

Table 3: Wall mounting (sliding) - vertical pull
MPL 200x30x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
86.21 kg / 190.07 lbs
86214.0 g / 845.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
57.48 kg / 126.71 lbs
57476.0 g / 563.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
28.74 kg / 63.36 lbs
28738.0 g / 281.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
143.69 kg / 316.78 lbs
143690.0 g / 1409.6 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 200x30x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
9.58 kg / 21.12 lbs
9579.3 g / 94.0 N
1 mm
8%
23.95 kg / 52.80 lbs
23948.3 g / 234.9 N
2 mm
17%
47.90 kg / 105.59 lbs
47896.7 g / 469.9 N
3 mm
25%
71.85 kg / 158.39 lbs
71845.0 g / 704.8 N
5 mm
42%
119.74 kg / 263.98 lbs
119741.7 g / 1174.7 N
10 mm
83%
239.48 kg / 527.97 lbs
239483.3 g / 2349.3 N
11 mm
92%
263.43 kg / 580.77 lbs
263431.7 g / 2584.3 N
12 mm
100%
287.38 kg / 633.56 lbs
287380.0 g / 2819.2 N

Table 5: Thermal resistance (stability) - resistance threshold
MPL 200x30x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 287.38 kg / 633.56 lbs
287380.0 g / 2819.2 N
OK
40 °C -2.2% 281.06 kg / 619.63 lbs
281057.6 g / 2757.2 N
OK
60 °C -4.4% 274.74 kg / 605.69 lbs
274735.3 g / 2695.2 N
80 °C -6.6% 268.41 kg / 591.75 lbs
268412.9 g / 2633.1 N
100 °C -28.8% 204.61 kg / 451.10 lbs
204614.6 g / 2007.3 N

Table 6: Two magnets (attraction) - field collision
MPL 200x30x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 732.71 kg / 1615.35 lbs
5 371 Gs
109.91 kg / 242.30 lbs
109907 g / 1078.2 N
N/A
1 mm 698.96 kg / 1540.95 lbs
8 694 Gs
104.84 kg / 231.14 lbs
104845 g / 1028.5 N
629.07 kg / 1386.85 lbs
~0 Gs
2 mm 665.22 kg / 1466.57 lbs
8 481 Gs
99.78 kg / 219.99 lbs
99784 g / 978.9 N
598.70 kg / 1319.91 lbs
~0 Gs
3 mm 632.29 kg / 1393.97 lbs
8 269 Gs
94.84 kg / 209.10 lbs
94844 g / 930.4 N
569.07 kg / 1254.57 lbs
~0 Gs
5 mm 569.22 kg / 1254.92 lbs
7 846 Gs
85.38 kg / 188.24 lbs
85383 g / 837.6 N
512.30 kg / 1129.42 lbs
~0 Gs
10 mm 430.56 kg / 949.22 lbs
6 823 Gs
64.58 kg / 142.38 lbs
64584 g / 633.6 N
387.50 kg / 854.29 lbs
~0 Gs
20 mm 238.49 kg / 525.78 lbs
5 078 Gs
35.77 kg / 78.87 lbs
35774 g / 350.9 N
214.64 kg / 473.20 lbs
~0 Gs
50 mm 48.45 kg / 106.82 lbs
2 289 Gs
7.27 kg / 16.02 lbs
7268 g / 71.3 N
43.61 kg / 96.13 lbs
~0 Gs
60 mm 31.33 kg / 69.07 lbs
1 841 Gs
4.70 kg / 10.36 lbs
4700 g / 46.1 N
28.20 kg / 62.16 lbs
~0 Gs
70 mm 21.09 kg / 46.49 lbs
1 510 Gs
3.16 kg / 6.97 lbs
3163 g / 31.0 N
18.98 kg / 41.84 lbs
~0 Gs
80 mm 14.67 kg / 32.35 lbs
1 260 Gs
2.20 kg / 4.85 lbs
2201 g / 21.6 N
13.21 kg / 29.12 lbs
~0 Gs
90 mm 10.50 kg / 23.15 lbs
1 066 Gs
1.58 kg / 3.47 lbs
1575 g / 15.5 N
9.45 kg / 20.83 lbs
~0 Gs
100 mm 7.69 kg / 16.95 lbs
912 Gs
1.15 kg / 2.54 lbs
1154 g / 11.3 N
6.92 kg / 15.26 lbs
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MPL 200x30x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 39.5 cm
Hearing aid 10 Gs (1.0 mT) 30.5 cm
Mechanical watch 20 Gs (2.0 mT) 23.5 cm
Mobile device 40 Gs (4.0 mT) 18.0 cm
Remote 50 Gs (5.0 mT) 16.5 cm
Payment card 400 Gs (40.0 mT) 5.5 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm

Table 8: Dynamics (kinetic energy) - warning
MPL 200x30x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.45 km/h
(4.85 m/s)
15.86 J
30 mm 26.16 km/h
(7.27 m/s)
35.64 J
50 mm 33.12 km/h
(9.20 m/s)
57.12 J
100 mm 46.56 km/h
(12.93 m/s)
112.90 J

Table 9: Coating parameters (durability)
MPL 200x30x30 / 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 200x30x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 221 734 Mx 2217.3 µWb
Pc Coefficient 0.45 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 200x30x30 / N38

Environment Effective steel pull Effect
Air (land) 287.38 kg Standard
Water (riverbed) 329.05 kg
(+41.67 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains just ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically 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) = 0.45

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 specification and ecology
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: 020125-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

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Model MPL 200x30x30 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 2819.19 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 200x30x30 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 200x30x30 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 287.38 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 200x30x30 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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: 200 mm (length), 30 mm (width), and 30 mm (thickness). It is a magnetic block with dimensions 200x30x30 mm and a self-weight of 1350 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets prove to be exceptionally resistant to demagnetization caused by external magnetic fields,
  • In other words, due to the glossy layer of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the possibility of flexible forming and adaptation to custom requirements, magnetic components can be modeled in a variety of shapes and sizes, which makes them more universal,
  • Significant place in modern industrial fields – they are used in HDD drives, electric drive systems, advanced medical instruments, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. 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 rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products can disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum magnetic pulling forcewhat contributes to it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with an polished contact surface
  • with direct contact (without impurities)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Practical aspects of lifting capacity – factors

It is worth knowing that the application force will differ influenced by the following factors, starting with the most relevant:
  • Clearance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Do not overheat magnets

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

Impact on smartphones

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Safe operation

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Magnets are brittle

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

Nickel coating and allergies

Studies show that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, refrain from direct skin contact and choose encased magnets.

Combustion hazard

Combustion risk: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Danger to pacemakers

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

No play value

Product intended for adults. Small elements can be swallowed, leading to serious injuries. Keep out of reach of children and animals.

Bodily injuries

Mind your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Be careful!

Threat to electronics

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98