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

MPL 45x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020164

GTIN/EAN: 5906301811701

5.00
Load capacity 28.48 kg / 279.40 N Magnetic Induction 306.29 mT / 3063 Gs
length
45 mm [±0,1 mm]
Width
25 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
84.38 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical details »

28.46 zł net / pcs

35.01 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
28.46 zł
35.01 zł
price from 30 pcs
26.75 zł
32.91 zł
price from 90 pcs
25.04 zł
30.81 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!

Physical properties - MPL 45x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 45x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020164
GTIN/EAN 5906301811701
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 45 mm [±0,1 mm]
Width 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 84.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 28.48 kg / 279.40 N
Magnetic Induction ~ ? 306.29 mT / 3063 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 45x25x10 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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

Technical analysis of the product - data

The following information represent the result of a physical simulation. Values were calculated on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these data as a reference point for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 45x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3062 Gs
306.2 mT
 28.48 kg / 62.79 pounds
28480.0 g / 279.4 N
 critical level
1 mm 2918 Gs
291.8 mT
 25.86 kg / 57.00 pounds
25856.7 g / 253.7 N
 critical level
2 mm 2760 Gs
276.0 mT
 23.13 kg / 51.00 pounds
23133.2 g / 226.9 N
 critical level
3 mm 2595 Gs
259.5 mT
 20.45 kg / 45.08 pounds
20449.5 g / 200.6 N
 critical level
5 mm 2261 Gs
226.1 mT
 15.53 kg / 34.23 pounds
15525.8 g / 152.3 N
 critical level
10 mm 1529 Gs
152.9 mT
 7.10 kg / 15.64 pounds
7096.1 g / 69.6 N
 strong
15 mm 1018 Gs
101.8 mT
 3.15 kg / 6.94 pounds
3147.4 g / 30.9 N
 strong
20 mm 688 Gs
68.8 mT
 1.44 kg / 3.17 pounds
1439.4 g / 14.1 N
 safe
30 mm 340 Gs
34.0 mT
 0.35 kg / 0.77 pounds
350.8 g / 3.4 N
 safe
50 mm 111 Gs
11.1 mT
 0.04 kg / 0.08 pounds
37.1 g / 0.4 N
 safe
Magnetic force weakens drastically with every mm of spacing. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably weakens the grip. Neodymiums work most effectively in perfect adhesion; air break nullifies the force. Analyze how flashily the parameters fall, when the magnet does not adhere tightly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Shear load (wall)
MPL 45x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.70 kg / 12.56 pounds
5696.0 g / 55.9 N
1 mm Stal (~0.2) 5.17 kg / 11.40 pounds
5172.0 g / 50.7 N
2 mm Stal (~0.2) 4.63 kg / 10.20 pounds
4626.0 g / 45.4 N
3 mm Stal (~0.2) 4.09 kg / 9.02 pounds
4090.0 g / 40.1 N
5 mm Stal (~0.2) 3.11 kg / 6.85 pounds
3106.0 g / 30.5 N
10 mm Stal (~0.2) 1.42 kg / 3.13 pounds
1420.0 g / 13.9 N
15 mm Stal (~0.2) 0.63 kg / 1.39 pounds
630.0 g / 6.2 N
20 mm Stal (~0.2) 0.29 kg / 0.63 pounds
288.0 g / 2.8 N
30 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
50 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
This section calculates the approximate force necessary to start the sliding of the magnet downwards on a vertical steel wall (assuming typical friction). This value varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 45x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.54 kg / 18.84 pounds
8544.0 g / 83.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.70 kg / 12.56 pounds
5696.0 g / 55.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.85 kg / 6.28 pounds
2848.0 g / 27.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
14.24 kg / 31.39 pounds
14240.0 g / 139.7 N
When mounting a element on a vertical surface (e.g., a car body), it will only hold just approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient mean that products move down easier than they pop off the substrate. Want to create a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the magnet will slip down under a noticeably lighter weight. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 45x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.42 kg / 3.14 pounds
1424.0 g / 14.0 N
1 mm
13%
 3.56 kg / 7.85 pounds
3560.0 g / 34.9 N
2 mm
25%
 7.12 kg / 15.70 pounds
7120.0 g / 69.8 N
3 mm
38%
 10.68 kg / 23.55 pounds
10680.0 g / 104.8 N
5 mm
63%
 17.80 kg / 39.24 pounds
17800.0 g / 174.6 N
10 mm
100%
 28.48 kg / 62.79 pounds
28480.0 g / 279.4 N
11 mm
100%
 28.48 kg / 62.79 pounds
28480.0 g / 279.4 N
12 mm
100%
 28.48 kg / 62.79 pounds
28480.0 g / 279.4 N
A thin sheet is unable to conduct the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the flux will pass right through and the pull force will drop sharply. To achieve full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the holder holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 45x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 28.48 kg / 62.79 pounds
28480.0 g / 279.4 N
 OK
40 °C -2.2% 27.85 kg / 61.41 pounds
27853.4 g / 273.2 N
 OK
60 °C -4.4% 27.23 kg / 60.02 pounds
27226.9 g / 267.1 N
80 °C -6.6% 26.60 kg / 58.64 pounds
26600.3 g / 260.9 N
100 °C -28.8% 20.28 kg / 44.70 pounds
20277.8 g / 198.9 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly damage this magnet. As the temperature rises, the magnet's power momentarily drops. Avoid using this magnet near heat sources exceeding its working range. Ignoring the limit will lead to permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 45x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 65.04 kg / 143.40 pounds
4 590 Gs
9.76 kg / 21.51 pounds
9757 g / 95.7 N
 N/A
1 mm 62.12 kg / 136.95 pounds
5 985 Gs
9.32 kg / 20.54 pounds
9318 g / 91.4 N
 55.91 kg / 123.25 pounds
~0 Gs
2 mm 59.05 kg / 130.19 pounds
5 836 Gs
8.86 kg / 19.53 pounds
8858 g / 86.9 N
 53.15 kg / 117.17 pounds
~0 Gs
3 mm 55.95 kg / 123.34 pounds
5 680 Gs
8.39 kg / 18.50 pounds
8392 g / 82.3 N
 50.35 kg / 111.01 pounds
~0 Gs
5 mm 49.74 kg / 109.66 pounds
5 356 Gs
7.46 kg / 16.45 pounds
7461 g / 73.2 N
 44.77 kg / 98.70 pounds
~0 Gs
10 mm 35.46 kg / 78.17 pounds
4 522 Gs
5.32 kg / 11.73 pounds
5319 g / 52.2 N
 31.91 kg / 70.36 pounds
~0 Gs
20 mm 16.21 kg / 35.73 pounds
3 057 Gs
2.43 kg / 5.36 pounds
2431 g / 23.8 N
 14.59 kg / 32.16 pounds
~0 Gs
50 mm 1.58 kg / 3.48 pounds
955 Gs
0.24 kg / 0.52 pounds
237 g / 2.3 N
 1.42 kg / 3.14 pounds
~0 Gs
60 mm 0.80 kg / 1.77 pounds
680 Gs
0.12 kg / 0.26 pounds
120 g / 1.2 N
 0.72 kg / 1.59 pounds
~0 Gs
70 mm 0.43 kg / 0.94 pounds
497 Gs
0.06 kg / 0.14 pounds
64 g / 0.6 N
 0.38 kg / 0.85 pounds
~0 Gs
80 mm 0.24 kg / 0.53 pounds
372 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
 0.22 kg / 0.47 pounds
~0 Gs
90 mm 0.14 kg / 0.31 pounds
284 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
 0.13 kg / 0.28 pounds
~0 Gs
100 mm 0.08 kg / 0.19 pounds
221 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.17 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a solid fastener? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*Flux density for N-N configuration reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Estimates show friction force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MPL 45x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.0 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Timepiece 20 Gs (2.0 mT) 10.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Car key 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
Extremely neodym field poses a serious hazard to electronic devices as well as medical implants. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MPL 45x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.21 km/h
(6.17 m/s)
 1.61 J
30 mm 24.94 km/h
(6.93 m/s)
 2.02 J
50 mm 25.09 km/h
(6.97 m/s)
 2.05 J
100 mm 25.12 km/h
(6.98 m/s)
 2.05 J
Neodymium magnets are delicate – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MPL 45x25x10 / 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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 45x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 35 829 Mx 358.3 µWb
Pc Coefficient 0.36 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter for generator designers as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 45x25x10 / N38

Environment Effective steel pull Effect
Air (land) 28.48 kg Standard
Water (riverbed) 32.61 kg
(+4.13 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Caution: On a vertical surface, the magnet retains only ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.36

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.

Technical and environmental data

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: 020164-2026
Magnet Unit Converter

Pulling force

Magnetic Induction

Input a figure in a single slot to see the conversion in the other units immediately.

See also proposals

MP 16x8/4x3 / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 16x8/4x3 / N38 - ring magnet

2.50 zł brutto / pcs
MP 12x8/4x3 / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 12x8/4x3 / N38 - ring magnet

1.427 zł brutto / pcs
MPL 13x10x5 / N35H - lamellar magnet
Product available Ships today (order by 14:00)

MPL 13x10x5 / N35H - lamellar magnet

2.58 zł brutto / pcs
UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread
Product available Ships today (order by 14:00)

UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

10.46 zł brutto / pcs
Model MPL 45x25x10 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 28.48 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. To separate the MPL 45x25x10 / 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 28.48 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 45x25x10 / N38, it is best to use 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. Remember to roughen and wash 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 45x25x10 mm, which, at a weight of 84.38 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 45x25x10 mm and a self-weight of 84.38 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of rare earth magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They retain attractive force for around ten years – the drop is just ~1% (based on simulations),
  • Magnets perfectly resist against demagnetization caused by external fields,
  • In other words, due to the reflective surface of nickel, the element gains visual value,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the possibility of accurate molding and adaptation to unique projects, NdFeB magnets can be modeled in a broad palette of geometric configurations, which makes them more universal,
  • Versatile presence in future technologies – they serve a role in magnetic memories, electric drive systems, medical devices, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Limitations

Characteristics of disadvantages of neodymium magnets: application proposals
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Detachment force of the magnet in optimal conditions – what affects it?

The force parameter is a measurement result executed under the following configuration:
  • on a plate made of structural steel, effectively closing the magnetic field
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • with zero gap (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Determinants of lifting force in real conditions

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Air gap (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be wasted into the air.
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Safe distance

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Magnet fragility

Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Do not drill into magnets

Powder produced during machining of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Hand protection

Large magnets can break fingers instantly. Never put your hand between two strong magnets.

Health Danger

Patients with a ICD have to maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Compass and GPS

A strong magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Swallowing risk

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.

Skin irritation risks

It is widely known that nickel (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and opt for versions in plastic housing.

Safe operation

Use magnets consciously. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their power.

Power loss in heat

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?