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

MW 40x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010066

GTIN/EAN: 5906301810650

Load capacity 27.73 kg / 271.99 N Magnetic Induction 277.22 mT / 2772 Gs
Diameter Ø
40 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
94.25 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical specifications »

29.73 zł net / pcs

36.57 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
29.73 zł
36.57 zł
price from 30 pcs
27.95 zł
34.37 zł
price from 90 pcs
26.16 zł
32.18 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

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 - MW 40x10 / N38 - cylindrical magnet

Specification / characteristics - MW 40x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010066
GTIN/EAN 5906301810650
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 40 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 27.73 kg / 271.99 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x10 / N38 - cylindrical 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

Technical modeling of the assembly - technical parameters

The following values constitute the direct effect of a engineering analysis. Values are based on models for the class Nd2Fe14B. Actual performance might slightly differ. Use these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
MW 40x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2772 Gs
277.2 mT
 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
 crushing
1 mm 2678 Gs
267.8 mT
 25.89 kg / 57.08 LBS
25889.6 g / 254.0 N
 crushing
2 mm 2573 Gs
257.3 mT
 23.89 kg / 52.68 LBS
23893.3 g / 234.4 N
 crushing
3 mm 2459 Gs
245.9 mT
 21.83 kg / 48.12 LBS
21827.6 g / 214.1 N
 crushing
5 mm 2216 Gs
221.6 mT
 17.73 kg / 39.08 LBS
17728.1 g / 173.9 N
 crushing
10 mm 1611 Gs
161.1 mT
 9.37 kg / 20.66 LBS
9371.0 g / 91.9 N
 strong
15 mm 1121 Gs
112.1 mT
 4.54 kg / 10.01 LBS
4538.6 g / 44.5 N
 strong
20 mm 775 Gs
77.5 mT
 2.17 kg / 4.77 LBS
2165.8 g / 21.2 N
 strong
30 mm 387 Gs
38.7 mT
 0.54 kg / 1.19 LBS
539.8 g / 5.3 N
 safe
50 mm 125 Gs
12.5 mT
 0.06 kg / 0.12 LBS
56.6 g / 0.6 N
 safe
Pulling power weakens drastically with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) strongly weakens the grip. Magnets operate strongest during direct contact; gap nullifies the force. Observe how rapidly the parameters fall, when the magnet does not touch tightly to the steel surface. When planning the assembly, eliminate unnecessary gaps.

Table 2: Slippage hold (wall)
MW 40x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
1 mm Stal (~0.2) 5.18 kg / 11.42 LBS
5178.0 g / 50.8 N
2 mm Stal (~0.2) 4.78 kg / 10.53 LBS
4778.0 g / 46.9 N
3 mm Stal (~0.2) 4.37 kg / 9.63 LBS
4366.0 g / 42.8 N
5 mm Stal (~0.2) 3.55 kg / 7.82 LBS
3546.0 g / 34.8 N
10 mm Stal (~0.2) 1.87 kg / 4.13 LBS
1874.0 g / 18.4 N
15 mm Stal (~0.2) 0.91 kg / 2.00 LBS
908.0 g / 8.9 N
20 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
30 mm Stal (~0.2) 0.11 kg / 0.24 LBS
108.0 g / 1.1 N
50 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
The table below shows the approximate force necessary to start the slippage of the magnet downwards along a vertical steel plate (assuming typical friction coefficient). The holding force depends on the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 40x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.32 kg / 18.34 LBS
8319.0 g / 81.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.77 kg / 6.11 LBS
2773.0 g / 27.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
13.87 kg / 30.57 LBS
13865.0 g / 136.0 N
When mounting a holder on a vertical wall (e.g., a fridge), it you can count on just about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that holders move down faster than they detach. Planning a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slide down under a significantly smaller weight. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.39 kg / 3.06 LBS
1386.5 g / 13.6 N
1 mm
13%
 3.47 kg / 7.64 LBS
3466.3 g / 34.0 N
2 mm
25%
 6.93 kg / 15.28 LBS
6932.5 g / 68.0 N
3 mm
38%
 10.40 kg / 22.93 LBS
10398.8 g / 102.0 N
5 mm
63%
 17.33 kg / 38.21 LBS
17331.3 g / 170.0 N
10 mm
100%
 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
11 mm
100%
 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
12 mm
100%
 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
A thin sheet cannot focus the entire magnetic field, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To squeeze 100% of this neodymium's potential, you need a suitably thick piece of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the product holds weaker. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MW 40x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
 OK
40 °C -2.2% 27.12 kg / 59.79 LBS
27119.9 g / 266.0 N
 OK
60 °C -4.4% 26.51 kg / 58.44 LBS
26509.9 g / 260.1 N
80 °C -6.6% 25.90 kg / 57.10 LBS
25899.8 g / 254.1 N
100 °C -28.8% 19.74 kg / 43.53 LBS
19743.8 g / 193.7 N
Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly destroy this magnet. As the temperature rises, the magnet's capacity momentarily drops. Avoid using this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) may lose charge permanently sooner compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 40x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.52 kg / 131.22 LBS
4 382 Gs
8.93 kg / 19.68 LBS
8928 g / 87.6 N
 N/A
1 mm 57.61 kg / 127.01 LBS
5 454 Gs
8.64 kg / 19.05 LBS
8642 g / 84.8 N
 51.85 kg / 114.31 LBS
~0 Gs
2 mm 55.57 kg / 122.52 LBS
5 357 Gs
8.34 kg / 18.38 LBS
8336 g / 81.8 N
 50.01 kg / 110.26 LBS
~0 Gs
3 mm 53.46 kg / 117.85 LBS
5 254 Gs
8.02 kg / 17.68 LBS
8019 g / 78.7 N
 48.11 kg / 106.07 LBS
~0 Gs
5 mm 49.08 kg / 108.20 LBS
5 034 Gs
7.36 kg / 16.23 LBS
7362 g / 72.2 N
 44.17 kg / 97.38 LBS
~0 Gs
10 mm 38.05 kg / 83.89 LBS
4 433 Gs
5.71 kg / 12.58 LBS
5708 g / 56.0 N
 34.25 kg / 75.50 LBS
~0 Gs
20 mm 20.11 kg / 44.35 LBS
3 223 Gs
3.02 kg / 6.65 LBS
3017 g / 29.6 N
 18.10 kg / 39.91 LBS
~0 Gs
50 mm 2.27 kg / 5.01 LBS
1 083 Gs
0.34 kg / 0.75 LBS
341 g / 3.3 N
 2.05 kg / 4.51 LBS
~0 Gs
60 mm 1.16 kg / 2.55 LBS
773 Gs
0.17 kg / 0.38 LBS
174 g / 1.7 N
 1.04 kg / 2.30 LBS
~0 Gs
70 mm 0.62 kg / 1.36 LBS
565 Gs
0.09 kg / 0.20 LBS
93 g / 0.9 N
 0.56 kg / 1.23 LBS
~0 Gs
80 mm 0.35 kg / 0.76 LBS
422 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
 0.31 kg / 0.69 LBS
~0 Gs
90 mm 0.20 kg / 0.44 LBS
322 Gs
0.03 kg / 0.07 LBS
30 g / 0.3 N
 0.18 kg / 0.40 LBS
~0 Gs
100 mm 0.12 kg / 0.27 LBS
251 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.24 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of action. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is slightly lower than the attraction, but still impressive.
*Flux density between like poles drops to ~0 Gs in the exact middle of the gap (due to field cancellation).
* Results demonstrate shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MW 40x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Timepiece 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.0 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These magnets generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 40x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.06 km/h
(6.13 m/s)
 1.77 J
30 mm 25.52 km/h
(7.09 m/s)
 2.37 J
50 mm 25.74 km/h
(7.15 m/s)
 2.41 J
100 mm 25.77 km/h
(7.16 m/s)
 2.41 J
NdFeB products are delicate – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MW 40x10 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 40x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 700 Mx 387.0 µWb
Pc Coefficient 0.35 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 40x10 / N38

Environment Effective steel pull Effect
Air (land) 27.73 kg Standard
Water (riverbed) 31.75 kg
(+4.02 kg buoyancy gain)
+14.5%
Rust risk: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Caution: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

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

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

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: 010066-2026
Magnet Unit Converter

Magnet pull force

Magnetic Field

Put a figure in just one field to receive results for the other units at once.

See more proposals

MPL 30x15x10 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 30x15x10 / N38 - lamellar magnet

24.48 zł brutto / pcs
MW 35x5 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 35x5 / N38 - cylindrical magnet

13.81 zł brutto / pcs
SM 28x400 [2xM8] / N52 - magnetic separator
Product available Ships today (order by 14:00)

SM 28x400 [2xM8] / N52 - magnetic separator

1242.30 zł brutto / pcs
MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

9.93 zł brutto / pcs
The presented product is an extremely powerful cylindrical magnet, produced from durable NdFeB material, which, at dimensions of Ø40x10 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 27.73 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 271.99 N with a weight of only 94.25 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø40x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 10 mm. The key parameter here is the lifting capacity amounting to approximately 27.73 kg (force ~271.99 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their power remains stable, and after around ten years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under close interference source,
  • In other words, due to the metallic finish of gold, the element looks attractive,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
  • Possibility of exact modeling and optimizing to atypical conditions,
  • Huge importance in advanced technology sectors – they are utilized in HDD drives, electric drive systems, diagnostic systems, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

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

Information about lifting capacity was defined for optimal configuration, including:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Magnet lifting force in use – key factors

During everyday use, the actual holding force is determined by several key aspects, presented from the most important:
  • Gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Caution required

Be careful. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can react.

Heat warning

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. This process is irreversible.

Risk of cracking

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Impact on smartphones

Navigation devices and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Machining danger

Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Allergy Warning

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, cease working with magnets and wear gloves.

Life threat

Patients with a heart stimulator should keep an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Electronic devices

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Do not give to children

Neodymium magnets are not intended for children. Eating multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires immediate surgery.

Hand protection

Big blocks can break fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.

Safety First! Want to know more? Check our post: Why are neodymium magnets dangerous?