← previous
next →
Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

MPL 25x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020392

GTIN/EAN: 5906301811893

5.00
Load capacity 1.89 kg / 18.53 N Magnetic Induction 120.03 mT / 1200 Gs
length
25 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
5.63 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
product specifications »

1.940 zł net / pcs

2.39 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
1.940 zł
2.39 zł
price from 350 pcs
1.824 zł
2.24 zł
price from 1300 pcs
1.707 zł
2.10 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

Product card - MPL 25x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 25x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020392
GTIN/EAN 5906301811893
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 25 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.89 kg / 18.53 N
Magnetic Induction ~ ? 120.03 mT / 1200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x15x2 / 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 310 °C
Curie Temperature TF 590 °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 product - technical parameters

The following values constitute the result of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MPL 25x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1200 Gs
120.0 mT
 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
 weak grip
1 mm 1144 Gs
114.4 mT
 1.72 kg / 3.79 lbs
1717.6 g / 16.8 N
 weak grip
2 mm 1060 Gs
106.0 mT
 1.48 kg / 3.25 lbs
1475.6 g / 14.5 N
 weak grip
3 mm 961 Gs
96.1 mT
 1.21 kg / 2.67 lbs
1212.1 g / 11.9 N
 weak grip
5 mm 754 Gs
75.4 mT
 0.75 kg / 1.65 lbs
746.8 g / 7.3 N
 weak grip
10 mm 376 Gs
37.6 mT
 0.19 kg / 0.41 lbs
185.6 g / 1.8 N
 weak grip
15 mm 193 Gs
19.3 mT
 0.05 kg / 0.11 lbs
48.9 g / 0.5 N
 weak grip
20 mm 107 Gs
10.7 mT
 0.02 kg / 0.03 lbs
15.0 g / 0.1 N
 weak grip
30 mm 41 Gs
4.1 mT
 0.00 kg / 0.00 lbs
2.2 g / 0.0 N
 weak grip
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Pulling power weakens drastically per each millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably reduces the pull force. Magnetic products hold strongest at the point of direct contact; distance kills the force. Notice how flashily the load capacity fall, when the product does not touch directly to the metal substrate. When planning the assembly, discard redundant distances.

Table 2: Vertical force (vertical surface)
MPL 25x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 lbs
378.0 g / 3.7 N
1 mm Stal (~0.2) 0.34 kg / 0.76 lbs
344.0 g / 3.4 N
2 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
3 mm Stal (~0.2) 0.24 kg / 0.53 lbs
242.0 g / 2.4 N
5 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
10 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 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
The table below shows the approximate holding capacity necessary to cause the slippage of the magnet downwards on a vertical steel wall (assuming typical friction coefficient). This value is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 25x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.57 kg / 1.25 lbs
567.0 g / 5.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 lbs
378.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.42 lbs
189.0 g / 1.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.95 kg / 2.08 lbs
945.0 g / 9.3 N
When placing a magnet on a vertical surface (e.g., a fridge), it will only hold only about 20%-30% of its nominal power. Gravitational force and a weak degree of grip mean that products move down faster than they pull off. Designing a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter weight. Application of an anti-slip layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MPL 25x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.19 kg / 0.42 lbs
189.0 g / 1.9 N
1 mm
25%
 0.47 kg / 1.04 lbs
472.5 g / 4.6 N
2 mm
50%
 0.95 kg / 2.08 lbs
945.0 g / 9.3 N
3 mm
75%
 1.42 kg / 3.13 lbs
1417.5 g / 13.9 N
5 mm
100%
 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
10 mm
100%
 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
11 mm
100%
 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
12 mm
100%
 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
A thin metal plate is not enough to conduct the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the holder works worse. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MPL 25x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.89 kg / 4.17 lbs
1890.0 g / 18.5 N
 OK
40 °C -2.2% 1.85 kg / 4.08 lbs
1848.4 g / 18.1 N
 OK
60 °C -4.4% 1.81 kg / 3.98 lbs
1806.8 g / 17.7 N
80 °C -6.6% 1.77 kg / 3.89 lbs
1765.3 g / 17.3 N
100 °C -28.8% 1.35 kg / 2.97 lbs
1345.7 g / 13.2 N
Ordinary NdFeB products lose strength past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. As the temperature rises, the magnet's force temporarily lowers. Avoid using this product close to heaters exceeding its operating temperature limit. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 25x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 lbs
2 260 Gs
0.50 kg / 1.10 lbs
499 g / 4.9 N
 N/A
1 mm 3.20 kg / 7.05 lbs
2 353 Gs
0.48 kg / 1.06 lbs
480 g / 4.7 N
 2.88 kg / 6.35 lbs
~0 Gs
2 mm 3.03 kg / 6.67 lbs
2 288 Gs
0.45 kg / 1.00 lbs
454 g / 4.5 N
 2.72 kg / 6.00 lbs
~0 Gs
3 mm 2.82 kg / 6.22 lbs
2 210 Gs
0.42 kg / 0.93 lbs
423 g / 4.2 N
 2.54 kg / 5.60 lbs
~0 Gs
5 mm 2.37 kg / 5.22 lbs
2 024 Gs
0.36 kg / 0.78 lbs
355 g / 3.5 N
 2.13 kg / 4.70 lbs
~0 Gs
10 mm 1.32 kg / 2.90 lbs
1 509 Gs
0.20 kg / 0.44 lbs
197 g / 1.9 N
 1.18 kg / 2.61 lbs
~0 Gs
20 mm 0.33 kg / 0.72 lbs
752 Gs
0.05 kg / 0.11 lbs
49 g / 0.5 N
 0.29 kg / 0.65 lbs
~0 Gs
50 mm 0.01 kg / 0.02 lbs
128 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
81 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 / 0.00 lbs
54 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 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
90 mm 0.00 kg / 0.00 lbs
28 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
21 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a further horizon of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Estimates demonstrate sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
MPL 25x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a serious hazard to electronic devices as well as medical implants. These NdFeB products generate a field that prevents correct functioning of digital equipment. Remember: the unseen radiation acts through matter and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 25x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.92 km/h
(5.53 m/s)
 0.09 J
30 mm 20.70 km/h
(5.75 m/s)
 0.09 J
50 mm 20.69 km/h
(5.75 m/s)
 0.09 J
100 mm 20.72 km/h
(5.76 m/s)
 0.09 J
Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can cause material chips or injury to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MPL 25x15x2 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 25x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 600 Mx 56.0 µWb
Pc Coefficient 0.14 Low (Flat)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 25x15x2 / N38

Environment Effective steel pull Effect
Air (land) 1.89 kg Standard
Water (riverbed) 2.16 kg
(+0.27 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Warning: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.14

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

Chemical composition

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: 020392-2026
Measurement Calculator

Magnet pull force

Magnetic Field

Input data in one of the inputs, and all other values change automatically.

View more offers

MW 12x6 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 12x6 / N38 - cylindrical magnet

1.882 zł brutto / pcs
SM 28x375 [2xM8] / N52 - magnetic separator
Product available Ships today (order by 14:00)

SM 28x375 [2xM8] / N52 - magnetic separator

1168.50 zł brutto / pcs
MW 5x3 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 5x3 / N38 - cylindrical magnet

0.283 zł brutto / pcs
UMH 42x9x46 [M6] / N38 - magnetic holder with hook
Product available Ships today (order by 14:00)

UMH 42x9x46 [M6] / N38 - magnetic holder with hook

35.99 zł brutto / pcs
Model MPL 25x15x2 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 1.89 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 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. To separate the MPL 25x15x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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.
Plate magnets MPL 25x15x2 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 1.89 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x15x2 / 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).
Standardly, the MPL 25x15x2 / N38 model is magnetized through the thickness (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (25x15 mm), which is ideal for flat mounting. 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: 25 mm (length), 15 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 25x15x2 mm and a self-weight of 5.63 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.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Magnets very well resist against demagnetization caused by external fields,
  • In other words, due to the aesthetic layer of nickel, the element looks attractive,
  • Magnets are characterized by excellent magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in shaping and the capacity to adapt to client solutions,
  • Wide application in electronics industry – they are utilized in hard drives, drive modules, precision medical tools, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Cons

Cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these magnets can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Holding force of 1.89 kg is a result of laboratory testing conducted under specific, ideal conditions:
  • using a sheet made of mild steel, serving as a magnetic yoke
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction vertical to the plane
  • in stable room temperature

Practical lifting capacity: influencing factors

Bear in mind that the working load will differ subject to the following factors, in order of importance:
  • Gap (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Serious injuries

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Compass and GPS

An intense magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

No play value

Only for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness appears, cease working with magnets and wear gloves.

Protective goggles

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Data carriers

Very strong magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Machining danger

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

Do not overheat magnets

Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Immense force

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

Implant safety

Patients with a ICD have to keep an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?