Product on order Ships in 3-5 days CO2 GPSR PPWR REACH

MW 21.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010045

GTIN/EAN: 5906301810445

Load capacity 14.65 kg / 143.71 N Magnetic Induction 417.89 mT / 4179 Gs
Diameter Ø
21.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
28.25 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical specifications »

12.60 zł net / pcs

15.50 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
12.60 zł
15.50 zł
price from 50 pcs
11.84 zł
14.57 zł
price from 200 pcs
11.09 zł
13.64 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

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 details - MW 21.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 21.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010045
GTIN/EAN 5906301810445
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 21.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 28.25 g
Magnetization Direction → diametrical
Load capacity ~ ? 14.65 kg / 143.71 N
Magnetic Induction ~ ? 417.89 mT / 4179 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 21.9x10 / N38 - cylindrical 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 magnet - report

The following information are the direct effect of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Operational performance may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
MW 21.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4178 Gs
417.8 mT
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
 dangerous!
1 mm 3830 Gs
383.0 mT
 12.31 kg / 27.15 pounds
12314.7 g / 120.8 N
 dangerous!
2 mm 3466 Gs
346.6 mT
 10.08 kg / 22.23 pounds
10083.5 g / 98.9 N
 dangerous!
3 mm 3104 Gs
310.4 mT
 8.09 kg / 17.83 pounds
8086.3 g / 79.3 N
 warning
5 mm 2432 Gs
243.2 mT
 4.97 kg / 10.95 pounds
4966.5 g / 48.7 N
 warning
10 mm 1257 Gs
125.7 mT
 1.33 kg / 2.93 pounds
1327.0 g / 13.0 N
 low risk
15 mm 671 Gs
67.1 mT
 0.38 kg / 0.83 pounds
378.5 g / 3.7 N
 low risk
20 mm 386 Gs
38.6 mT
 0.13 kg / 0.28 pounds
125.0 g / 1.2 N
 low risk
30 mm 156 Gs
15.6 mT
 0.02 kg / 0.04 pounds
20.4 g / 0.2 N
 low risk
50 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 pounds
1.5 g / 0.0 N
 low risk
Magnetic force decreases significantly with every mm of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) strongly reduces the pull force. Magnetic products operate optimally during direct contact; distance drastically cuts the force. See how quickly the load capacity fall, when the magnet does not adhere tightly to the metal substrate. When planning the arrangement, eliminate additional spacers.

Table 2: Slippage force (wall)
MW 21.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
1 mm Stal (~0.2) 2.46 kg / 5.43 pounds
2462.0 g / 24.2 N
2 mm Stal (~0.2) 2.02 kg / 4.44 pounds
2016.0 g / 19.8 N
3 mm Stal (~0.2) 1.62 kg / 3.57 pounds
1618.0 g / 15.9 N
5 mm Stal (~0.2) 0.99 kg / 2.19 pounds
994.0 g / 9.8 N
10 mm Stal (~0.2) 0.27 kg / 0.59 pounds
266.0 g / 2.6 N
15 mm Stal (~0.2) 0.08 kg / 0.17 pounds
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below presents the theoretical holding capacity sufficient to initiate the slippage of the magnet downwards on a vertical steel plate (assuming typical friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 21.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.40 kg / 9.69 pounds
4395.0 g / 43.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.93 kg / 6.46 pounds
2930.0 g / 28.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.47 kg / 3.23 pounds
1465.0 g / 14.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.33 kg / 16.15 pounds
7325.0 g / 71.9 N
When mounting a holder on a vertical wall (e.g., a car body), it you can count on barely approx. 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that magnets slip easier than they pop off the substrate. Planning a vertical fastening? Note that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a noticeably lighter cargo. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 21.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.73 kg / 1.61 pounds
732.5 g / 7.2 N
1 mm
13%
 1.83 kg / 4.04 pounds
1831.3 g / 18.0 N
2 mm
25%
 3.66 kg / 8.07 pounds
3662.5 g / 35.9 N
3 mm
38%
 5.49 kg / 12.11 pounds
5493.8 g / 53.9 N
5 mm
63%
 9.16 kg / 20.19 pounds
9156.3 g / 89.8 N
10 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
11 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
12 mm
100%
 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this magnet's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - resistance threshold
MW 21.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.65 kg / 32.30 pounds
14650.0 g / 143.7 N
 OK
40 °C -2.2% 14.33 kg / 31.59 pounds
14327.7 g / 140.6 N
 OK
60 °C -4.4% 14.01 kg / 30.88 pounds
14005.4 g / 137.4 N
80 °C -6.6% 13.68 kg / 30.17 pounds
13683.1 g / 134.2 N
100 °C -28.8% 10.43 kg / 23.00 pounds
10430.8 g / 102.3 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can irreversibly damage this magnet. As the temperature rises, the neodymium's force momentarily decreases. Avoid using this magnet close to ovens exceeding its operating temperature limit. Too high temperature will result in destruction of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 21.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 40.53 kg / 89.35 pounds
5 433 Gs
6.08 kg / 13.40 pounds
6079 g / 59.6 N
 N/A
1 mm 37.31 kg / 82.26 pounds
8 017 Gs
5.60 kg / 12.34 pounds
5597 g / 54.9 N
 33.58 kg / 74.03 pounds
~0 Gs
2 mm 34.07 kg / 75.11 pounds
7 660 Gs
5.11 kg / 11.27 pounds
5110 g / 50.1 N
 30.66 kg / 67.60 pounds
~0 Gs
3 mm 30.92 kg / 68.16 pounds
7 297 Gs
4.64 kg / 10.22 pounds
4637 g / 45.5 N
 27.82 kg / 61.34 pounds
~0 Gs
5 mm 25.04 kg / 55.20 pounds
6 567 Gs
3.76 kg / 8.28 pounds
3756 g / 36.8 N
 22.54 kg / 49.68 pounds
~0 Gs
10 mm 13.74 kg / 30.29 pounds
4 865 Gs
2.06 kg / 4.54 pounds
2061 g / 20.2 N
 12.37 kg / 27.26 pounds
~0 Gs
20 mm 3.67 kg / 8.09 pounds
2 515 Gs
0.55 kg / 1.21 pounds
551 g / 5.4 N
 3.30 kg / 7.28 pounds
~0 Gs
50 mm 0.13 kg / 0.29 pounds
476 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
 0.12 kg / 0.26 pounds
~0 Gs
60 mm 0.06 kg / 0.12 pounds
312 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
70 mm 0.03 kg / 0.06 pounds
214 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
80 mm 0.01 kg / 0.03 pounds
153 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
90 mm 0.01 kg / 0.02 pounds
113 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
86 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still large.
*Field value for N-N configuration reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Important: Results apply to friction force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 21.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.0 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a serious hazard to electronics as well as pacemakers. These magnets generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation penetrates the body 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, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 21.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.32 km/h
(6.48 m/s)
 0.59 J
30 mm 24.35 km/h
(6.76 m/s)
 0.65 J
50 mm 24.37 km/h
(6.77 m/s)
 0.65 J
100 mm 24.37 km/h
(6.77 m/s)
 0.65 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
MW 21.9x10 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 21.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 059 Mx 160.6 µWb
Pc Coefficient 0.55 Low (Flat)
Flux value passing through the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 21.9x10 / N38

Environment Effective steel pull Effect
Air (land) 14.65 kg Standard
Water (riverbed) 16.77 kg
(+2.12 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

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

2. Efficiency vs thickness

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55

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%

Ecology and recycling (GPSR)

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: 010045-2026
Quick Unit Converter

Magnet pull force

Magnetic Field

Enter a number into a field, to see the remaining units change in real-time.

Other products

MW 45x35 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 45x35 / N38 - cylindrical magnet

180.10 zł brutto / pcs
MPL 40x5x3 / N38 - lamellar magnet
Product on order Ships in 3-5 days

MPL 40x5x3 / N38 - lamellar magnet

6.65 zł brutto / pcs
SM 32x475 [2xM8] / N52 - magnetic separator
Product on order Ships in 3-5 days

SM 32x475 [2xM8] / N52 - magnetic separator

1488.30 zł brutto / pcs
MW 33x30 / N38 - cylindrical magnet
Product on order Ships in 3-5 days

MW 33x30 / N38 - cylindrical magnet

52.89 zł brutto / pcs
This product is a very strong cylinder magnet, made from advanced NdFeB material, which, at dimensions of Ø21.9x10 mm, guarantees maximum efficiency. The MW 21.9x10 / N38 model boasts a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 14.65 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 143.71 N with a weight of only 28.25 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø21.9x10), 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 21.9 mm and height 10 mm. The value of 143.71 N means that the magnet is capable of holding a weight many times exceeding its own mass of 28.25 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 21.9 mm. 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They do not lose strength, even over around ten years – the drop in lifting capacity is only ~1% (based on measurements),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the metallic surface of nickel, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • In view of the possibility of free forming and adaptation to custom projects, magnetic components can be modeled in a variety of forms and dimensions, which makes them more universal,
  • Wide application in modern industrial fields – they are used in computer drives, brushless drives, medical devices, as well as modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of neodymium 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 increases its resistance to damage
  • Neodymium magnets lose strength 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of producing threads in the magnet and complex shapes - recommended is a housing - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

Magnet power was determined for the most favorable conditions, taking into account:
  • using a plate made of high-permeability steel, functioning as a ideal flux conductor
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface cleaned and smooth
  • with direct contact (no coatings)
  • during pulling in a direction vertical to the plane
  • at room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load will differ subject to elements below, starting with the most relevant:
  • Gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Plate material – mild steel attracts best. Alloy steels lower magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Threat to navigation

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Machining danger

Dust produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Crushing force

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

Danger to the youngest

Always store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.

Warning for heart patients

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Keep away from computers

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

Conscious usage

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Power loss in heat

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

Allergy Warning

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, prevent touching magnets with bare hands and select coated magnets.

Material brittleness

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them shattering into shards.

Security! Learn more about risks in the article: Magnet Safety Guide.