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

MPL 80x40x15 / N38 - lamellar magnet

lamellar magnet

Catalog no 020177

GTIN/EAN: 5906301811831

5.00
Load capacity 73.57 kg / 721.75 N Magnetic Induction 285.78 mT / 2858 Gs
length
80 mm [±0,1 mm]
Width
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
360 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

check technical specifications »

113.45 zł net / pcs

139.54 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
113.45 zł
139.54 zł
price from 10 pcs
106.64 zł
131.17 zł
price from 25 pcs
99.84 zł
122.80 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!

Technical data - MPL 80x40x15 / N38 - lamellar magnet

Specification / characteristics - MPL 80x40x15 / N38 - lamellar magnet

properties
properties values
Cat. no. 020177
GTIN/EAN 5906301811831
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 80 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 360 g
Magnetization Direction ↑ axial
Load capacity ~ ? 73.57 kg / 721.75 N
Magnetic Induction ~ ? 285.78 mT / 2858 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 80x40x15 / 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

Physical analysis of the product - technical parameters

These data are the outcome of a engineering simulation. Results are based on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
MPL 80x40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2857 Gs
285.7 mT
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 critical level
1 mm 2778 Gs
277.8 mT
 69.55 kg / 153.32 LBS
69546.1 g / 682.2 N
 critical level
2 mm 2693 Gs
269.3 mT
 65.33 kg / 144.03 LBS
65331.2 g / 640.9 N
 critical level
3 mm 2603 Gs
260.3 mT
 61.05 kg / 134.59 LBS
61047.5 g / 598.9 N
 critical level
5 mm 2415 Gs
241.5 mT
 52.56 kg / 115.87 LBS
52559.7 g / 515.6 N
 critical level
10 mm 1943 Gs
194.3 mT
 34.02 kg / 75.00 LBS
34021.1 g / 333.7 N
 critical level
15 mm 1527 Gs
152.7 mT
 21.01 kg / 46.31 LBS
21007.7 g / 206.1 N
 critical level
20 mm 1192 Gs
119.2 mT
 12.81 kg / 28.24 LBS
12808.1 g / 125.6 N
 critical level
30 mm 736 Gs
73.6 mT
 4.89 kg / 10.77 LBS
4886.6 g / 47.9 N
 strong
50 mm 313 Gs
31.3 mT
 0.88 kg / 1.95 LBS
884.8 g / 8.7 N
 low risk
Pulling power decreases sharply with every subsequent millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) noticeably reduces the pull force. Magnets work strongest at the point of direct contact; distance drastically cuts the force. Observe how flashily the parameters drop, when the magnet does not touch flatly to the steel surface. When calculating the assembly, avoid additional spacers.

Table 2: Shear force (wall)
MPL 80x40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
1 mm Stal (~0.2) 13.91 kg / 30.67 LBS
13910.0 g / 136.5 N
2 mm Stal (~0.2) 13.07 kg / 28.81 LBS
13066.0 g / 128.2 N
3 mm Stal (~0.2) 12.21 kg / 26.92 LBS
12210.0 g / 119.8 N
5 mm Stal (~0.2) 10.51 kg / 23.17 LBS
10512.0 g / 103.1 N
10 mm Stal (~0.2) 6.80 kg / 15.00 LBS
6804.0 g / 66.7 N
15 mm Stal (~0.2) 4.20 kg / 9.26 LBS
4202.0 g / 41.2 N
20 mm Stal (~0.2) 2.56 kg / 5.65 LBS
2562.0 g / 25.1 N
30 mm Stal (~0.2) 0.98 kg / 2.16 LBS
978.0 g / 9.6 N
50 mm Stal (~0.2) 0.18 kg / 0.39 LBS
176.0 g / 1.7 N
The table below defines the theoretical holding capacity necessary to cause the shifting of the magnet vertically against a vertical steel wall (considering typical friction). The holding force depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 80x40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
22.07 kg / 48.66 LBS
22071.0 g / 216.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.36 kg / 16.22 LBS
7357.0 g / 72.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
36.79 kg / 81.10 LBS
36785.0 g / 360.9 N
When placing a holder on a vertical surface (e.g., a board), it will only hold only about 20%-30% of nominal attraction strength. Gravity and a low friction coefficient influence the fact that products slip faster than they pull off. Want to create a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a noticeably lighter cargo. Application of an anti-slip layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 80x40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.45 kg / 5.41 LBS
2452.3 g / 24.1 N
1 mm
8%
 6.13 kg / 13.52 LBS
6130.8 g / 60.1 N
2 mm
17%
 12.26 kg / 27.03 LBS
12261.7 g / 120.3 N
3 mm
25%
 18.39 kg / 40.55 LBS
18392.5 g / 180.4 N
5 mm
42%
 30.65 kg / 67.58 LBS
30654.2 g / 300.7 N
10 mm
83%
 61.31 kg / 135.16 LBS
61308.3 g / 601.4 N
11 mm
92%
 67.44 kg / 148.68 LBS
67439.2 g / 661.6 N
12 mm
100%
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
A too thin steel is not enough to focus the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a weak sheet, the flux will pass right through and the pull force will drop sharply. To squeeze 100% of this magnet's potential, you need a suitably thick piece of steel. The saturation effect causes that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MPL 80x40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 OK
40 °C -2.2% 71.95 kg / 158.63 LBS
71951.5 g / 705.8 N
 OK
60 °C -4.4% 70.33 kg / 155.06 LBS
70332.9 g / 690.0 N
80 °C -6.6% 68.71 kg / 151.49 LBS
68714.4 g / 674.1 N
100 °C -28.8% 52.38 kg / 115.48 LBS
52381.8 g / 513.9 N
Standard neodymium magnets lose power after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly damage this magnet. As the temperature rises, the neodymium's power briefly decreases. Refrain from using this magnet near heat sources higher than its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 161.08 kg / 355.13 LBS
4 384 Gs
24.16 kg / 53.27 LBS
24163 g / 237.0 N
 N/A
1 mm 156.77 kg / 345.63 LBS
5 638 Gs
23.52 kg / 51.84 LBS
23516 g / 230.7 N
 141.10 kg / 311.07 LBS
~0 Gs
2 mm 152.27 kg / 335.70 LBS
5 556 Gs
22.84 kg / 50.36 LBS
22841 g / 224.1 N
 137.05 kg / 302.13 LBS
~0 Gs
3 mm 147.69 kg / 325.60 LBS
5 472 Gs
22.15 kg / 48.84 LBS
22153 g / 217.3 N
 132.92 kg / 293.04 LBS
~0 Gs
5 mm 138.36 kg / 305.04 LBS
5 297 Gs
20.75 kg / 45.76 LBS
20754 g / 203.6 N
 124.53 kg / 274.53 LBS
~0 Gs
10 mm 115.08 kg / 253.71 LBS
4 830 Gs
17.26 kg / 38.06 LBS
17262 g / 169.3 N
 103.57 kg / 228.34 LBS
~0 Gs
20 mm 74.49 kg / 164.22 LBS
3 886 Gs
11.17 kg / 24.63 LBS
11174 g / 109.6 N
 67.04 kg / 147.80 LBS
~0 Gs
50 mm 17.20 kg / 37.91 LBS
1 867 Gs
2.58 kg / 5.69 LBS
2580 g / 25.3 N
 15.48 kg / 34.12 LBS
~0 Gs
60 mm 10.70 kg / 23.59 LBS
1 473 Gs
1.60 kg / 3.54 LBS
1605 g / 15.7 N
 9.63 kg / 21.23 LBS
~0 Gs
70 mm 6.78 kg / 14.94 LBS
1 172 Gs
1.02 kg / 2.24 LBS
1017 g / 10.0 N
 6.10 kg / 13.45 LBS
~0 Gs
80 mm 4.38 kg / 9.65 LBS
942 Gs
0.66 kg / 1.45 LBS
657 g / 6.4 N
 3.94 kg / 8.69 LBS
~0 Gs
90 mm 2.89 kg / 6.36 LBS
765 Gs
0.43 kg / 0.95 LBS
433 g / 4.2 N
 2.60 kg / 5.72 LBS
~0 Gs
100 mm 1.94 kg / 4.27 LBS
627 Gs
0.29 kg / 0.64 LBS
291 g / 2.9 N
 1.74 kg / 3.84 LBS
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Attention: Calculations demonstrate shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 80x40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.0 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Timepiece 20 Gs (2.0 mT) 16.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 12.5 cm
Car key 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Powerful magnet radiation is a serious hazard to IT equipment as well as pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MPL 80x40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.36 km/h
(5.38 m/s)
 5.20 J
30 mm 24.22 km/h
(6.73 m/s)
 8.15 J
50 mm 24.87 km/h
(6.91 m/s)
 8.59 J
100 mm 25.05 km/h
(6.96 m/s)
 8.72 J
Magnetic elements are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MPL 80x40x15 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MPL 80x40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 94 833 Mx 948.3 µWb
Pc Coefficient 0.33 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MPL 80x40x15 / N38

Environment Effective steel pull Effect
Air (land) 73.57 kg Standard
Water (riverbed) 84.24 kg
(+10.67 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Vertical hold

*Note: On a vertical wall, the magnet holds just a fraction of its max power.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.33

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

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: 020177-2026
Quick Unit Converter

Pulling force

Field Strength

Just populate any input, to let the converter fill in the rest automatically.

Other offers

UMT 12x20 green / N38 - board holder
Product available Ships today (order by 14:00)

UMT 12x20 green / N38 - board holder

1.894 zł brutto / pcs
MP 5x2.7/1.2x5 Z / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 5x2.7/1.2x5 Z / N38 - ring magnet

0.836 zł brutto / pcs
UI 45x13x6 [Z323] / N38 - badge holder
Product available Ships today (order by 14:00)

UI 45x13x6 [Z323] / N38 - badge holder

2.40 zł brutto / pcs
UMS 48x18x8.5x11.5 / N38 - conical magnetic holder
Product available Ships today (order by 14:00)

UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

44.92 zł brutto / pcs
This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 80x40x15 mm and a weight of 360 g, guarantees premium class connection. This magnetic block with a force of 721.75 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 80x40x15 / 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 80x40x15 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts 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 80x40x15 / N38, it is best to use strong epoxy glues (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 80x40x15 / N38 model is magnetized through the thickness (dimension 15 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 (80x40 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 80x40x15 mm, which, at a weight of 360 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 73.57 kg (force ~721.75 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under strong external field,
  • By applying a lustrous layer of silver, the element has an proper look,
  • Magnetic induction on the surface of the magnet is strong,
  • 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 versatility in constructing and the ability to customize to client solutions,
  • Significant place in electronics industry – they are commonly used in hard drives, drive modules, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in compact constructions

Disadvantages

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

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

Breakaway force was determined for optimal configuration, including:
  • using a base made of low-carbon steel, serving as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • with a plane free of scratches
  • with total lack of distance (no paint)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Key elements affecting lifting force

In real-world applications, the real power results from a number of factors, listed from crucial:
  • Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Base massiveness – too thin steel does not accept the full field, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Do not give to children

NdFeB magnets are not toys. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates immediate surgery.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Flammability

Dust generated during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Skin irritation risks

A percentage of the population experience a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching can result in dermatitis. It is best to wear safety gloves.

Handling guide

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

Physical harm

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Shattering risk

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.

Impact on smartphones

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

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